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Reducing underwater noise, protecting the oceans and driving naval innovation\u00a0<\/span><\/span><\/em><\/span><\/h2>\n[\/et_pb_text][et_pb_button button_url=”https:\/\/tsisl.es\/es\/contacto\/” button_text=”CONTACT WITH US” button_alignment=”center” _builder_version=”4.27.4″ _module_preset=”default” custom_button=”on” button_text_color=”#FFFFFF” button_bg_color=”#64A70B” button_font=”Albert Sans||||||||” global_colors_info=”{}”][\/et_pb_button][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ _builder_version=”4.27.4″ _module_preset=”default” min_height=”613.1px” custom_margin=”||1px||false|false” custom_padding=”53px||0px||false|false” da_disable_devices=”off|off|off” global_colors_info=”{}” da_is_popup=”off” da_exit_intent=”off” da_has_close=”on” da_alt_close=”off” da_dark_close=”off” da_not_modal=”on” da_is_singular=”off” da_with_loader=”off” da_has_shadow=”on”][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”24px|||||” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” inline_fonts=”Albert Sans” global_colors_info=”{}”]<\/p>\n
Silent Ships Solutions (S\u00b3): a quieter future for the oceans.\u00a0<\/span><\/h1>\n\n
In a world where reducing Underwater Radiated Noise (URN) has become a global priority<\/strong>, the shipping industry faces a new challenge: moving towards more sustainable, competitive and environmentally and seafarer-friendly ships.<\/p>\nThe International Maritime Organisation (IMO)<\/strong>,<\/a> through the Revised Guidelines for the Reduction of URN (MEPC.1\/Circ.906, 2023), has established a clear framework for shipowners, shipyards and operators to take effective measures to mitigate the acoustic impact of ships.<\/p>\nAt TSI \u2013 T\u00e9cnicas y Servicios de Ingenier\u00eda<\/a><\/strong>, we have been leading international projects in underwater acoustics, vibrations and noise for more than 45 years, offering pioneering solutions for measurement, analysis, modelling and validation in sea trials. This experience has given rise to Silent Ships Solutions (S3): TSI’s comprehensive service for the design and adaptation of ships that meet the most demanding requirements in terms of noise, vibrations and underwater radiated noise (URN).<\/p>\n\n
\n
Check out our official Poster on the impact of URN at the IMO!<\/span><\/strong><\/span><\/a><\/h3>\n[\/et_pb_text][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” min_height=”108.6px” custom_margin=”||-45px|||” custom_padding=”39px||54px|||” global_colors_info=”{}”]<\/p>\n
What do we offer with S\u00b3?<\/span><\/span><\/h3>\n\n
Our comprehensive solution combines engineering and advanced technology to:<\/p>\n
\n- Help the shipping industry comply with international regulations<\/strong>, improve competitiveness and protect the marine environment, paving the way for a quieter future in the oceans.<\/li>\n<\/ul>\n
<\/p>\n
<\/p>\n
[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ _builder_version=”4.27.4″ _module_preset=”default” background_image=”https:\/\/tsisl.es\/wp-content\/uploads\/2025\/09\/DANA-V-images-for-website3-1851-x-900-1900×900-1.jpg” background_position=”top_center” background_vertical_offset=”59%” module_alignment=”center” custom_margin=”-42px|||||” custom_padding=”117px||77px|||” da_disable_devices=”off|off|off” global_colors_info=”{}” da_is_popup=”off” da_exit_intent=”off” da_has_close=”on” da_alt_close=”off” da_dark_close=”off” da_not_modal=”on” da_is_singular=”off” da_with_loader=”off” da_has_shadow=”on”][\/et_pb_section][et_pb_section fb_built=”1″ _builder_version=”4.27.4″ _module_preset=”default” min_height=”817.1px” custom_margin=”20px||-7px||false|false” custom_padding=”44px||0px||false|false” da_disable_devices=”off|off|off” global_colors_info=”{}” da_is_popup=”off” da_exit_intent=”off” da_has_close=”on” da_alt_close=”off” da_dark_close=”off” da_not_modal=”on” da_is_singular=”off” da_with_loader=”off” da_has_shadow=”on”][et_pb_row column_structure=”1_2,1_2″ use_custom_gutter=”on” gutter_width=”1″ make_equal=”on” _builder_version=”4.27.4″ _module_preset=”default” width=”100%” max_width=”2560px” custom_margin=”-18px|auto|32px|auto|false|false” custom_padding=”23px||0px||false|false” locked=”off” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.16″ _module_preset=”default” custom_padding=”0px|3%||10%|false|false” custom_padding_tablet=”|10%|||false|false” custom_padding_phone=”|||10%|false|false” custom_padding_last_edited=”on|phone” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” text_font_size=”15px” text_orientation=”justified” custom_margin=”||0px||false|false” custom_padding=”0px|0px|0px||false|false” animation_style=”fade” global_colors_info=”{}”]<\/p>\n
<\/span><\/span><\/h1>\nWhat does S\u00b3 mean?<\/span><\/span><\/h1>\nS\u00b3 -Silent Ships Solutions-<\/strong> represents our vision for the future: an approach in which Performance, Stealth, and Sustainability come together as the three pillars of the new naval standard.<\/span><\/p>\n<\/span><\/p>\nS\u00b3 is not just a service, it is a commitment<\/strong>:<\/p>\n\n- To shipowners,<\/strong> who seek competitiveness and regulatory compliance.<\/li>\n
- To shipyards<\/strong> and manufacturers, who need reliable methodologies.<\/li>\n
- To the oceans and marine life<\/strong>, which cannot wait any longer.<\/li>\n<\/ul>\n
<\/p>\n
[\/et_pb_text][et_pb_gallery gallery_ids=”31116,42157,42155,42153,42151,42159,42141,42139,42143″ fullwidth=”on” _builder_version=”4.27.4″ _module_preset=”default” position_origin_a=”bottom_center” position_origin_a_tablet=”” position_origin_a_phone=”” position_origin_a_last_edited=”on|desktop” position_origin_f_tablet=”” position_origin_f_phone=”” position_origin_f_last_edited=”on|desktop” position_origin_r_tablet=”” position_origin_r_phone=”” position_origin_r_last_edited=”on|desktop” width=”100%” custom_margin=”||0px||false|false” custom_padding=”3px||0px||false|false” custom_padding_tablet=”30px||||false|false” custom_padding_phone=”” custom_padding_last_edited=”on|phone” auto=”on” auto_speed=”5000″ positioning_tablet=”none” positioning_phone=”” positioning_last_edited=”on|tablet” dbdb_version=”4.12″ global_colors_info=”{}”][\/et_pb_gallery][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.16″ _module_preset=”default” background_enable_image=”off” custom_padding=”||0px||false|false” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” header_font=”|600|||||||” header_text_color=”#64A70B” header_2_text_color=”#64A70B” header_3_font=”||||||||” header_3_text_color=”#64A70B” custom_margin=”||0px||false|false” custom_padding=”|0px||||” animation_style=”fade” global_colors_info=”{}”]<\/p>\n
What is the URN and why is it so important?<\/span><\/h2>\n[\/et_pb_text][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” text_font_size=”15px” text_orientation=”justified” custom_margin=”||0px||false|false” custom_padding=”16px|147px|0px||false|false” animation_style=”fade” global_colors_info=”{}”]<\/p>\n
Underwater radiated noise (URN)<\/strong> generated by ships has become a growing concern: in recent decades, it has increased significantly, altering the acoustic balance of the oceans and negatively affecting marine wildlife.<\/p>\nAware of this problem, the International Maritime Organization (IMO)<\/strong> published the Revised Guidelines for the Reduction of Underwater Noise from Shipping (MEPC.1\/Circ.906) in 2023<\/strong>, establishing a framework for action aimed at all stakeholders in the maritime sector.<\/p>\nThese guidelines<\/strong> urge shipowners, shipyards, manufacturers, designers, and classification societies to implement effective solutions<\/strong> to reduce the acoustic impact of ships, while promoting initiatives to share practical experiences in order to enrich global knowledge in this area.<\/p>\n\ud83d\udc49URN reduction<\/strong> is not only a technical recommendation, but also an environmental and strategic commitment for maritime transport.<\/p>\n<\/ul>\n[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_divider color=”#64A70B” divider_weight=”2px” _builder_version=”4.27.4″ _module_preset=”default” custom_margin=”||13px|||” global_colors_info=”{}”][\/et_pb_divider][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” inline_fonts=”Albert Sans” global_colors_info=”{}”]<\/p>\n
\u00abToday, new designs for any vessel must be geared toward achieving a perfect balance between performance, reduction of its acoustic signature, and detectability\u00bb.<\/span><\/h2>\n[\/et_pb_text][et_pb_divider color=”#64A70B” divider_weight=”2px” _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_divider][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”0px||30px|||” da_disable_devices=”off|off|off” global_colors_info=”{}” da_is_popup=”off” da_exit_intent=”off” da_has_close=”on” da_alt_close=”off” da_dark_close=”off” da_not_modal=”on” da_is_singular=”off” da_with_loader=”off” da_has_shadow=”on”][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.27.4″ _module_preset=”default” custom_margin=”16px|auto|0px|auto||” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
The Methodology: Control and prevention.<\/span><\/h1>\n[\/et_pb_text][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
At TSI \u2013 Engineering Techniques and Services, we have been solving vibration and noise problems on ships for over 45 years. Our Silent Ships Solutions (S\u00b3) proposal combines experience, engineering, and technology to achieve technically validated results in two areas:<\/p>\n
\n
\n- New Vessels.<\/li>\n
- Existing Vessels.<\/li>\n<\/ul>\n
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Specialized engineering solutions<\/span><\/span><\/h2>\n[\/et_pb_text][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” text_text_color=”#FFFFFF” global_colors_info=”{}”]<\/p>\n
Currently, the design of new ships must strike an optimal balance between performance and vibroacoustic behavior.<\/p>\n
[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”33px||4px|||” da_disable_devices=”off|off|off” global_colors_info=”{}” da_is_popup=”off” da_exit_intent=”off” da_has_close=”on” da_alt_close=”off” da_dark_close=”off” da_not_modal=”on” da_is_singular=”off” da_with_loader=”off” da_has_shadow=”on”][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}” custom_padding=”||2px|||”][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_accordion toggle_icon=”:||divi||400″ icon_color=”#64A70B” _builder_version=”4.27.4″ _module_preset=”default” width=”95%” custom_margin=”|-88px||25px||” border_width_bottom=”10px” border_color_bottom=”#64A70B” global_colors_info=”{}”][et_pb_accordion_item title=”Existing Vessels” open=”on” open_toggle_text_color=”#64A70B” _builder_version=”4.27.4″ _module_preset=”default” body_font=”Albert Sans||||||||” body_font_size=”13px” global_colors_info=”{}” toggle_level=”h2″ toggle_font=”Albert Sans||||||||”]<\/p>\n
The URN database currently available for existing vessels, while invaluable from an environmental standpoint, does not allow for the precise identification of viable corrective engineering actions that would mitigate the current URN baseline in each particular case.<\/p>\n
From a TSI perspective, it is essential to undertake a comprehensive assessment of structural noise (SBN), cavitation, the baseline radiated noise to water (URN) of each ship, and its operational performance. Only through this holistic approach is it possible to define technically and economically viable engineering solutions that enable a significant reduction in current URN while maintaining an appropriate balance with the vessel’s performance. (See more details on these activities).<\/p>\n
In this way, we help shipowners and operators to better manage the acoustic signature.<\/p>\n
[\/et_pb_accordion_item][et_pb_accordion_item title=”Main activities” _builder_version=”4.27.4″ _module_preset=”default” body_font=”Albert Sans||||||||” body_font_size=”13px” global_colors_info=”{}” toggle_level=”h5″ toggle_font=”Albert Sans||||||||” open=”off”]<\/p>\n
\n- Structural Noise Assessment (SBN).<\/span><\/li>\n
- Propeller Cavitation Assessment (using our Ni-CDS system).<\/span><\/li>\n
- URN \u2013 Underwater Radiated Noise. Baseline.<\/span><\/li>\n
- Ship Performance: Power and Speed.<\/span><\/li>\n<\/ol>\n
[\/et_pb_accordion_item][\/et_pb_accordion][et_pb_image src=”https:\/\/tsisl.es\/wp-content\/uploads\/2025\/09\/4-1.jpg” title_text=”4″ _builder_version=”4.27.4″ _module_preset=”default” width=”98.8%” min_height=”471.9px” custom_padding=”|||26px||” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_accordion toggle_icon=”:||divi||400″ icon_color=”#64A70B” _builder_version=”4.27.4″ _module_preset=”default” width=”96%” custom_margin=”|-88px|18px|1px||” border_width_bottom=”10px” border_color_bottom=”#64A70B” global_colors_info=”{}”][et_pb_accordion_item title=”New Vessels” open=”on” open_toggle_text_color=”#64A70B” _builder_version=”4.27.4″ _module_preset=”default” body_font=”Albert Sans||||||||” body_font_size=”13px” global_colors_info=”{}” toggle_level=”h2″ toggle_font=”Albert Sans||||||||”]<\/p>\n
Experience has shown us that reducing radiated noise into the water (URN) in newly built ships is an achievable goal, provided that shipowners include this requirement in their contract specifications and shipyards apply the appropriate methodology to comply with it.<\/p>\n
The application of our comprehensive vibration and noise management methodology to the dynamic and acoustic design of all types of ships\u2014including specific types such as fishing research vessels (FRVs) and military vessels\u2014using internationally recognized engineering tools (FEM, BEM, and SEA models), has enabled the development of vessels that are up to 60 dB quieter (in the case of FRVs) than conventional commercial vessels in service.<\/p>\n
The result is quieter, more efficient, and more environmentally friendly vessels that are ready to meet the challenges of the present and the future with confidence.<\/p>\n
[\/et_pb_accordion_item][et_pb_accordion_item title=”Main activities” _builder_version=”4.27.4″ _module_preset=”default” body_font=”Albert Sans||||||||” body_font_size=”13px” global_colors_info=”{}” toggle_level=”h5″ toggle_font=”Albert Sans||||||||” closed_toggle_font=”Albert Sans||||||||” open=”off”]<\/p>\n
\n- Specification of Noise, Vibrations, and URN.<\/li>\n
- Specific dynamic and acoustic requirements for main equipment.<\/li>\n
- FAT – Factory Acceptance Tests for Contractual Validation.<\/li>\n
- Solution: Comprehensive Noise and Vibration Management (N&V – CMC).<\/li>\n
- Sea Trial Service.<\/li>\n<\/ol>\n
[\/et_pb_accordion_item][\/et_pb_accordion][et_pb_image src=”https:\/\/tsisl.es\/wp-content\/uploads\/2025\/09\/5-1.jpg” title_text=”5″ _builder_version=”4.27.4″ _module_preset=”default” width=”99.2%” min_height=”474px” custom_margin=”||11px|||” custom_padding=”|20px|22px|||” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”20px||32px|||” da_disable_devices=”off|off|off” global_colors_info=”{}” da_is_popup=”off” da_exit_intent=”off” da_has_close=”on” da_alt_close=”off” da_dark_close=”off” da_not_modal=”on” da_is_singular=”off” da_with_loader=”off” da_has_shadow=”on”][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”29px|||25px||” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” inline_fonts=”Albert Sans” global_colors_info=”{}”]<\/p>\n
New Vessels<\/span><\/span><\/h1>\n[\/et_pb_text][et_pb_toggle title=”1. Structural Borne Noise Assessment” _builder_version=”4.27.4″ _module_preset=”default” title_font=”Albert Sans||||||||” title_font_size=”15px” body_font=”Albert Sans||||||||” body_font_size=”15px” width=”100%” custom_padding=”|13px||||” global_colors_info=”{}”]<\/p>\n
\n- Dynamic characterization of the machinery on board the existing vessel.<\/li>\n
- Assessment in accordance with applicable regulations and standards.<\/li>\n
- Recommendations for improvement.<\/li>\n<\/ul>\n
[\/et_pb_toggle][et_pb_toggle title=”2. Propeller Cavitation Assessment (Ni-CDS)” _builder_version=”4.27.4″ _module_preset=”default” title_font=”Albert Sans||||||||” title_font_size=”15px” body_font=”Albert Sans||||||||” body_font_size=”15px” width=”100%” custom_padding=”|13px||||” global_colors_info=”{}”]<\/p>\n
\n- Actual (experimental) cavitation onset speed.<\/li>\n
- Verification of operating profiles under cavitation conditions.<\/li>\n
- Recommendations for selecting operating parameters that mitigate cavitation.<\/li>\n<\/ul>\n
[\/et_pb_toggle][et_pb_toggle title=”3. URN-Underwater Radiated Noise. Baseline Measurement” _builder_version=”4.27.4″ _module_preset=”default” title_font=”Albert Sans||||||||” title_font_size=”15px” body_font=”Albert Sans||||||||” body_font_size=”15px” width=”100%” custom_padding=”|13px||||” global_colors_info=”{}”]<\/p>\n
\n- Dynamic characterization of the machinery on board the existing vessel.<\/li>\n
- Assessment in accordance with applicable regulations and standards.<\/li>\n
- Recommendations for improvement.<\/li>\n<\/ul>\n
[\/et_pb_toggle][et_pb_toggle title=”4. Ship Performance: Power and Speed” _builder_version=”4.27.4″ _module_preset=”default” title_font=”Albert Sans||||||||” title_font_size=”15px” body_font=”Albert Sans||||||||” body_font_size=”15px” width=”100%” custom_padding=”|11px||||” global_colors_info=”{}”]<\/p>\n
\n- Dynamic characterization of the machinery on board the existing vessel.<\/li>\n
- Assessment in accordance with applicable regulations and standards.<\/li>\n
- Recommendations for improvement.<\/li>\n<\/ul>\n
[\/et_pb_toggle][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” inline_fonts=”Albert Sans” global_colors_info=”{}”]<\/p>\n
Existing Vessels<\/span><\/span><\/h1>\n[\/et_pb_text][et_pb_toggle title=”1. Noise, Vibration, and URN Specifications” _builder_version=”4.27.4″ _module_preset=”default” title_font=”Albert Sans||||||||” title_font_size=”15px” body_font=”Albert Sans||||||||” body_font_size=”15px” width=”99.7%” custom_padding=”|13px||||” global_colors_info=”{}”]<\/p>\n
The specialized definition<\/strong> in this section is essential to achieving the \u201cSilent Ship\u201d<\/strong> objective. It includes not only compliance with the limits established by regulations or the corresponding comfort notation<\/strong>, but also the application of the appropriate methodology to achieve the defined objectives.<\/p>\n[\/et_pb_toggle][et_pb_toggle title=”2. Propeller Cavitation Assessment (Ni-CDS)” _builder_version=”4.27.4″ _module_preset=”default” title_font=”Albert Sans||||||||” title_font_size=”15px” body_font=”Albert Sans||||||||” body_font_size=”15px” width=”99.8%” custom_padding=”|13px||||” global_colors_info=”{}”]<\/p>\n
Achieving a \u201cSilent Ship\u201d<\/strong> inevitably requires controlling the main sources of noise<\/strong> and vibration. In this regard, defining specific dynamic and acoustic requirements for the main sources of noise and vibration is critical to meeting the project’s objectives. Buying \u201csilence\u201d becomes a necessity!<\/p>\nThe correct definition of these requirements is essential for:<\/p>\n
<\/p>\n
\n- Ensuring the structural integrity<\/strong> of the equipment supplied.<\/li>\n
- Meeting<\/strong> the specified noise, vibration, and URN objectives.<\/li>\n
- Performing<\/strong> an adequate dynamic and acoustic characterization of noise and vibration sources, allowing for the design of effective treatments to minimize their impact on the cost and weight of the ship.<\/li>\n
- Applying adequate insulation<\/strong> to limit the transmission of noise and vibrations to the ship’s structure.<\/li>\n
- Reducing<\/strong> propeller-induced excitation.<\/li>\n<\/ul>\n
[\/et_pb_toggle][et_pb_toggle title=”3. FAT- Factory Acceptance Tests for contractual validation.” open_toggle_background_color=”rgba(127,122,114,0.18)” _builder_version=”4.27.4″ _module_preset=”default” title_font=”Albert Sans||||||||” title_font_size=”15px” body_font=”Albert Sans||||||||” body_font_size=”15px” width=”99.8%” custom_padding=”|13px||||” global_colors_info=”{}”]<\/p>\n
In addition to verifying performance<\/strong> and structural integrity, FATs represent contractual validation<\/strong> of the supplier’s commitment to the project’s objectives<\/strong> from a dynamic and acoustic standpoint, thus contributing to the achievement of a \u201cSilent Ship.\u201d<\/strong><\/p>\n![\"\"](\"https:\/\/tsisl.es\/wp-content\/uploads\/2025\/09\/Normativa-ISO-TSI-referencia-1024x576.png\")
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[\/et_pb_toggle][et_pb_toggle title=”4. Comprehensive Noise and Vibration Management (N&V CMC)” _builder_version=”4.27.4″ _module_preset=”default” title_font=”Albert Sans||||||||” title_font_size=”15px” body_font=”Albert Sans||||||||” body_font_size=”15px” width=”99.7%” custom_padding=”|13px||||” global_colors_info=”{}”]<\/p>\n
Specialized engineering tool for the design, analysis, and control of noise and vibrations<\/strong> in all phases of a shipbuilding project in compliance with Class Notations and Underwater Radiated Noise (URN) requirements.<\/p>\n![\"\"](\"https:\/\/tsisl.es\/wp-content\/uploads\/2025\/11\/Grafico-URN-Nuevos-Buques-TSI-e1763122389257-1024x592.png\")
<\/p>\n
<\/p>\n
[\/et_pb_toggle][et_pb_toggle title=”5. Integral Sea Trials” _builder_version=”4.27.4″ _module_preset=”default” title_font=”Albert Sans||||||||” title_font_size=”15px” body_font=”Albert Sans||||||||” body_font_size=”15px” width=”99.9%” custom_padding=”20px|13px||||” global_colors_info=”{}”]<\/p>\n
\n
In a world where reducing Underwater Radiated Noise (URN) has become a global priority<\/strong>, the shipping industry faces a new challenge: moving towards more sustainable, competitive and environmentally and seafarer-friendly ships.<\/p>\n The International Maritime Organisation (IMO)<\/strong>,<\/a> through the Revised Guidelines for the Reduction of URN (MEPC.1\/Circ.906, 2023), has established a clear framework for shipowners, shipyards and operators to take effective measures to mitigate the acoustic impact of ships.<\/p>\n At TSI \u2013 T\u00e9cnicas y Servicios de Ingenier\u00eda<\/a><\/strong>, we have been leading international projects in underwater acoustics, vibrations and noise for more than 45 years, offering pioneering solutions for measurement, analysis, modelling and validation in sea trials. This experience has given rise to Silent Ships Solutions (S3): TSI’s comprehensive service for the design and adaptation of ships that meet the most demanding requirements in terms of noise, vibrations and underwater radiated noise (URN).<\/p>\n \n \n [\/et_pb_text][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” min_height=”108.6px” custom_margin=”||-45px|||” custom_padding=”39px||54px|||” global_colors_info=”{}”]<\/p>\n \n Our comprehensive solution combines engineering and advanced technology to:<\/p>\n <\/p>\n <\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ _builder_version=”4.27.4″ _module_preset=”default” background_image=”https:\/\/tsisl.es\/wp-content\/uploads\/2025\/09\/DANA-V-images-for-website3-1851-x-900-1900×900-1.jpg” background_position=”top_center” background_vertical_offset=”59%” module_alignment=”center” custom_margin=”-42px|||||” custom_padding=”117px||77px|||” da_disable_devices=”off|off|off” global_colors_info=”{}” da_is_popup=”off” da_exit_intent=”off” da_has_close=”on” da_alt_close=”off” da_dark_close=”off” da_not_modal=”on” da_is_singular=”off” da_with_loader=”off” da_has_shadow=”on”][\/et_pb_section][et_pb_section fb_built=”1″ _builder_version=”4.27.4″ _module_preset=”default” min_height=”817.1px” custom_margin=”20px||-7px||false|false” custom_padding=”44px||0px||false|false” da_disable_devices=”off|off|off” global_colors_info=”{}” da_is_popup=”off” da_exit_intent=”off” da_has_close=”on” da_alt_close=”off” da_dark_close=”off” da_not_modal=”on” da_is_singular=”off” da_with_loader=”off” da_has_shadow=”on”][et_pb_row column_structure=”1_2,1_2″ use_custom_gutter=”on” gutter_width=”1″ make_equal=”on” _builder_version=”4.27.4″ _module_preset=”default” width=”100%” max_width=”2560px” custom_margin=”-18px|auto|32px|auto|false|false” custom_padding=”23px||0px||false|false” locked=”off” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.16″ _module_preset=”default” custom_padding=”0px|3%||10%|false|false” custom_padding_tablet=”|10%|||false|false” custom_padding_phone=”|||10%|false|false” custom_padding_last_edited=”on|phone” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” text_font_size=”15px” text_orientation=”justified” custom_margin=”||0px||false|false” custom_padding=”0px|0px|0px||false|false” animation_style=”fade” global_colors_info=”{}”]<\/p>\n S\u00b3 -Silent Ships Solutions-<\/strong> represents our vision for the future: an approach in which Performance, Stealth, and Sustainability come together as the three pillars of the new naval standard.<\/span><\/p>\n <\/span><\/p>\n S\u00b3 is not just a service, it is a commitment<\/strong>:<\/p>\n <\/p>\n [\/et_pb_text][et_pb_gallery gallery_ids=”31116,42157,42155,42153,42151,42159,42141,42139,42143″ fullwidth=”on” _builder_version=”4.27.4″ _module_preset=”default” position_origin_a=”bottom_center” position_origin_a_tablet=”” position_origin_a_phone=”” position_origin_a_last_edited=”on|desktop” position_origin_f_tablet=”” position_origin_f_phone=”” position_origin_f_last_edited=”on|desktop” position_origin_r_tablet=”” position_origin_r_phone=”” position_origin_r_last_edited=”on|desktop” width=”100%” custom_margin=”||0px||false|false” custom_padding=”3px||0px||false|false” custom_padding_tablet=”30px||||false|false” custom_padding_phone=”” custom_padding_last_edited=”on|phone” auto=”on” auto_speed=”5000″ positioning_tablet=”none” positioning_phone=”” positioning_last_edited=”on|tablet” dbdb_version=”4.12″ global_colors_info=”{}”][\/et_pb_gallery][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.16″ _module_preset=”default” background_enable_image=”off” custom_padding=”||0px||false|false” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” header_font=”|600|||||||” header_text_color=”#64A70B” header_2_text_color=”#64A70B” header_3_font=”||||||||” header_3_text_color=”#64A70B” custom_margin=”||0px||false|false” custom_padding=”|0px||||” animation_style=”fade” global_colors_info=”{}”]<\/p>\n [\/et_pb_text][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” text_font_size=”15px” text_orientation=”justified” custom_margin=”||0px||false|false” custom_padding=”16px|147px|0px||false|false” animation_style=”fade” global_colors_info=”{}”]<\/p>\n Underwater radiated noise (URN)<\/strong> generated by ships has become a growing concern: in recent decades, it has increased significantly, altering the acoustic balance of the oceans and negatively affecting marine wildlife.<\/p>\n Aware of this problem, the International Maritime Organization (IMO)<\/strong> published the Revised Guidelines for the Reduction of Underwater Noise from Shipping (MEPC.1\/Circ.906) in 2023<\/strong>, establishing a framework for action aimed at all stakeholders in the maritime sector.<\/p>\n These guidelines<\/strong> urge shipowners, shipyards, manufacturers, designers, and classification societies to implement effective solutions<\/strong> to reduce the acoustic impact of ships, while promoting initiatives to share practical experiences in order to enrich global knowledge in this area.<\/p>\n \ud83d\udc49URN reduction<\/strong> is not only a technical recommendation, but also an environmental and strategic commitment for maritime transport.<\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_divider color=”#64A70B” divider_weight=”2px” _builder_version=”4.27.4″ _module_preset=”default” custom_margin=”||13px|||” global_colors_info=”{}”][\/et_pb_divider][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” inline_fonts=”Albert Sans” global_colors_info=”{}”]<\/p>\n [\/et_pb_text][et_pb_divider color=”#64A70B” divider_weight=”2px” _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_divider][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”0px||30px|||” da_disable_devices=”off|off|off” global_colors_info=”{}” da_is_popup=”off” da_exit_intent=”off” da_has_close=”on” da_alt_close=”off” da_dark_close=”off” da_not_modal=”on” da_is_singular=”off” da_with_loader=”off” da_has_shadow=”on”][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.27.4″ _module_preset=”default” custom_margin=”16px|auto|0px|auto||” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n [\/et_pb_text][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n At TSI \u2013 Engineering Techniques and Services, we have been solving vibration and noise problems on ships for over 45 years. Our Silent Ships Solutions (S\u00b3) proposal combines experience, engineering, and technology to achieve technically validated results in two areas:<\/p>\n \n [\/et_pb_text][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_gallery gallery_ids=”42124,42122,42120,42118,42116,42114,42112,42110″ fullwidth=”on” _builder_version=”4.27.4″ _module_preset=”default” position_origin_a=”bottom_center” position_origin_a_tablet=”” position_origin_a_phone=”” position_origin_a_last_edited=”on|desktop” position_origin_f_tablet=”” position_origin_f_phone=”” position_origin_f_last_edited=”on|desktop” position_origin_r_tablet=”” position_origin_r_phone=”” position_origin_r_last_edited=”on|desktop” width=”100%” custom_margin=”||0px||false|false” custom_padding=”3px||0px||false|false” custom_padding_tablet=”30px||||false|false” custom_padding_phone=”” custom_padding_last_edited=”on|phone” auto=”on” auto_speed=”5000″ positioning_tablet=”none” positioning_phone=”” positioning_last_edited=”on|tablet” dbdb_version=”4.12″ global_colors_info=”{}”][\/et_pb_gallery][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ _builder_version=”4.27.4″ _module_preset=”default” background_color=”#004159″ background_image=”https:\/\/tsisl.es\/wp-content\/uploads\/2025\/09\/Barco-Crucero-de-cursos-CBM-TSI-2025.jpg” background_position=”bottom_center” background_vertical_offset=”44%” background_blend=”overlay” min_height=”306px” custom_margin=”0px||||false|false” custom_padding=”10px||10px||true|false” top_divider_style=”slant2″ top_divider_color=”rgba(1,127,153,0.41)” top_divider_flip=”horizontal” bottom_divider_style=”slant2″ bottom_divider_color=”rgba(3,162,173,0.45)” bottom_divider_flip=”horizontal” da_disable_devices=”off|off|off” global_colors_info=”{}” da_is_popup=”off” da_exit_intent=”off” da_has_close=”on” da_alt_close=”off” da_dark_close=”off” da_not_modal=”on” da_is_singular=”off” da_with_loader=”off” da_has_shadow=”on”][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”92px|||||” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n [\/et_pb_text][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” text_text_color=”#FFFFFF” global_colors_info=”{}”]<\/p>\n Currently, the design of new ships must strike an optimal balance between performance and vibroacoustic behavior.<\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”33px||4px|||” da_disable_devices=”off|off|off” global_colors_info=”{}” da_is_popup=”off” da_exit_intent=”off” da_has_close=”on” da_alt_close=”off” da_dark_close=”off” da_not_modal=”on” da_is_singular=”off” da_with_loader=”off” da_has_shadow=”on”][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}” custom_padding=”||2px|||”][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_accordion toggle_icon=”:||divi||400″ icon_color=”#64A70B” _builder_version=”4.27.4″ _module_preset=”default” width=”95%” custom_margin=”|-88px||25px||” border_width_bottom=”10px” border_color_bottom=”#64A70B” global_colors_info=”{}”][et_pb_accordion_item title=”Existing Vessels” open=”on” open_toggle_text_color=”#64A70B” _builder_version=”4.27.4″ _module_preset=”default” body_font=”Albert Sans||||||||” body_font_size=”13px” global_colors_info=”{}” toggle_level=”h2″ toggle_font=”Albert Sans||||||||”]<\/p>\n The URN database currently available for existing vessels, while invaluable from an environmental standpoint, does not allow for the precise identification of viable corrective engineering actions that would mitigate the current URN baseline in each particular case.<\/p>\n From a TSI perspective, it is essential to undertake a comprehensive assessment of structural noise (SBN), cavitation, the baseline radiated noise to water (URN) of each ship, and its operational performance. Only through this holistic approach is it possible to define technically and economically viable engineering solutions that enable a significant reduction in current URN while maintaining an appropriate balance with the vessel’s performance. (See more details on these activities).<\/p>\n In this way, we help shipowners and operators to better manage the acoustic signature.<\/p>\n [\/et_pb_accordion_item][et_pb_accordion_item title=”Main activities” _builder_version=”4.27.4″ _module_preset=”default” body_font=”Albert Sans||||||||” body_font_size=”13px” global_colors_info=”{}” toggle_level=”h5″ toggle_font=”Albert Sans||||||||” open=”off”]<\/p>\n [\/et_pb_accordion_item][\/et_pb_accordion][et_pb_image src=”https:\/\/tsisl.es\/wp-content\/uploads\/2025\/09\/4-1.jpg” title_text=”4″ _builder_version=”4.27.4″ _module_preset=”default” width=”98.8%” min_height=”471.9px” custom_padding=”|||26px||” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_accordion toggle_icon=”:||divi||400″ icon_color=”#64A70B” _builder_version=”4.27.4″ _module_preset=”default” width=”96%” custom_margin=”|-88px|18px|1px||” border_width_bottom=”10px” border_color_bottom=”#64A70B” global_colors_info=”{}”][et_pb_accordion_item title=”New Vessels” open=”on” open_toggle_text_color=”#64A70B” _builder_version=”4.27.4″ _module_preset=”default” body_font=”Albert Sans||||||||” body_font_size=”13px” global_colors_info=”{}” toggle_level=”h2″ toggle_font=”Albert Sans||||||||”]<\/p>\n Experience has shown us that reducing radiated noise into the water (URN) in newly built ships is an achievable goal, provided that shipowners include this requirement in their contract specifications and shipyards apply the appropriate methodology to comply with it.<\/p>\n The application of our comprehensive vibration and noise management methodology to the dynamic and acoustic design of all types of ships\u2014including specific types such as fishing research vessels (FRVs) and military vessels\u2014using internationally recognized engineering tools (FEM, BEM, and SEA models), has enabled the development of vessels that are up to 60 dB quieter (in the case of FRVs) than conventional commercial vessels in service.<\/p>\n The result is quieter, more efficient, and more environmentally friendly vessels that are ready to meet the challenges of the present and the future with confidence.<\/p>\n [\/et_pb_accordion_item][et_pb_accordion_item title=”Main activities” _builder_version=”4.27.4″ _module_preset=”default” body_font=”Albert Sans||||||||” body_font_size=”13px” global_colors_info=”{}” toggle_level=”h5″ toggle_font=”Albert Sans||||||||” closed_toggle_font=”Albert Sans||||||||” open=”off”]<\/p>\n [\/et_pb_accordion_item][\/et_pb_accordion][et_pb_image src=”https:\/\/tsisl.es\/wp-content\/uploads\/2025\/09\/5-1.jpg” title_text=”5″ _builder_version=”4.27.4″ _module_preset=”default” width=”99.2%” min_height=”474px” custom_margin=”||11px|||” custom_padding=”|20px|22px|||” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”20px||32px|||” da_disable_devices=”off|off|off” global_colors_info=”{}” da_is_popup=”off” da_exit_intent=”off” da_has_close=”on” da_alt_close=”off” da_dark_close=”off” da_not_modal=”on” da_is_singular=”off” da_with_loader=”off” da_has_shadow=”on”][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”29px|||25px||” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” inline_fonts=”Albert Sans” global_colors_info=”{}”]<\/p>\n [\/et_pb_text][et_pb_toggle title=”1. Structural Borne Noise Assessment” _builder_version=”4.27.4″ _module_preset=”default” title_font=”Albert Sans||||||||” title_font_size=”15px” body_font=”Albert Sans||||||||” body_font_size=”15px” width=”100%” custom_padding=”|13px||||” global_colors_info=”{}”]<\/p>\n [\/et_pb_toggle][et_pb_toggle title=”2. Propeller Cavitation Assessment (Ni-CDS)” _builder_version=”4.27.4″ _module_preset=”default” title_font=”Albert Sans||||||||” title_font_size=”15px” body_font=”Albert Sans||||||||” body_font_size=”15px” width=”100%” custom_padding=”|13px||||” global_colors_info=”{}”]<\/p>\n [\/et_pb_toggle][et_pb_toggle title=”3. URN-Underwater Radiated Noise. Baseline Measurement” _builder_version=”4.27.4″ _module_preset=”default” title_font=”Albert Sans||||||||” title_font_size=”15px” body_font=”Albert Sans||||||||” body_font_size=”15px” width=”100%” custom_padding=”|13px||||” global_colors_info=”{}”]<\/p>\n [\/et_pb_toggle][et_pb_toggle title=”4. Ship Performance: Power and Speed” _builder_version=”4.27.4″ _module_preset=”default” title_font=”Albert Sans||||||||” title_font_size=”15px” body_font=”Albert Sans||||||||” body_font_size=”15px” width=”100%” custom_padding=”|11px||||” global_colors_info=”{}”]<\/p>\n [\/et_pb_toggle][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” inline_fonts=”Albert Sans” global_colors_info=”{}”]<\/p>\n [\/et_pb_text][et_pb_toggle title=”1. Noise, Vibration, and URN Specifications” _builder_version=”4.27.4″ _module_preset=”default” title_font=”Albert Sans||||||||” title_font_size=”15px” body_font=”Albert Sans||||||||” body_font_size=”15px” width=”99.7%” custom_padding=”|13px||||” global_colors_info=”{}”]<\/p>\n The specialized definition<\/strong> in this section is essential to achieving the \u201cSilent Ship\u201d<\/strong> objective. It includes not only compliance with the limits established by regulations or the corresponding comfort notation<\/strong>, but also the application of the appropriate methodology to achieve the defined objectives.<\/p>\n [\/et_pb_toggle][et_pb_toggle title=”2. Propeller Cavitation Assessment (Ni-CDS)” _builder_version=”4.27.4″ _module_preset=”default” title_font=”Albert Sans||||||||” title_font_size=”15px” body_font=”Albert Sans||||||||” body_font_size=”15px” width=”99.8%” custom_padding=”|13px||||” global_colors_info=”{}”]<\/p>\n Achieving a \u201cSilent Ship\u201d<\/strong> inevitably requires controlling the main sources of noise<\/strong> and vibration. In this regard, defining specific dynamic and acoustic requirements for the main sources of noise and vibration is critical to meeting the project’s objectives. Buying \u201csilence\u201d becomes a necessity!<\/p>\n The correct definition of these requirements is essential for:<\/p>\n <\/p>\n [\/et_pb_toggle][et_pb_toggle title=”3. FAT- Factory Acceptance Tests for contractual validation.” open_toggle_background_color=”rgba(127,122,114,0.18)” _builder_version=”4.27.4″ _module_preset=”default” title_font=”Albert Sans||||||||” title_font_size=”15px” body_font=”Albert Sans||||||||” body_font_size=”15px” width=”99.8%” custom_padding=”|13px||||” global_colors_info=”{}”]<\/p>\n In addition to verifying performance<\/strong> and structural integrity, FATs represent contractual validation<\/strong> of the supplier’s commitment to the project’s objectives<\/strong> from a dynamic and acoustic standpoint, thus contributing to the achievement of a \u201cSilent Ship.\u201d<\/strong><\/p>\n [\/et_pb_toggle][et_pb_toggle title=”4. Comprehensive Noise and Vibration Management (N&V CMC)” _builder_version=”4.27.4″ _module_preset=”default” title_font=”Albert Sans||||||||” title_font_size=”15px” body_font=”Albert Sans||||||||” body_font_size=”15px” width=”99.7%” custom_padding=”|13px||||” global_colors_info=”{}”]<\/p>\n Specialized engineering tool for the design, analysis, and control of noise and vibrations<\/strong> in all phases of a shipbuilding project in compliance with Class Notations and Underwater Radiated Noise (URN) requirements.<\/p>\n <\/p>\n [\/et_pb_toggle][et_pb_toggle title=”5. Integral Sea Trials” _builder_version=”4.27.4″ _module_preset=”default” title_font=”Albert Sans||||||||” title_font_size=”15px” body_font=”Albert Sans||||||||” body_font_size=”15px” width=”99.9%” custom_padding=”20px|13px||||” global_colors_info=”{}”]<\/p>\nCheck out our official Poster on the impact of URN at the IMO!<\/span><\/strong><\/span><\/a><\/h3>\n
What do we offer with S\u00b3?<\/span><\/span><\/h3>\n
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What does S\u00b3 mean?<\/span><\/span><\/h1>\n
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What is the URN and why is it so important?<\/span><\/h2>\n
<\/ul>\n
\u00abToday, new designs for any vessel must be geared toward achieving a perfect balance between performance, reduction of its acoustic signature, and detectability\u00bb.<\/span><\/h2>\n
The Methodology: Control and prevention.<\/span><\/h1>\n
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Specialized engineering solutions<\/span><\/span><\/h2>\n
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New Vessels<\/span><\/span><\/h1>\n
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Existing Vessels<\/span><\/span><\/h1>\n
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<\/p>\n<\/p>\n