{"id":250414,"date":"2025-04-24T11:23:17","date_gmt":"2025-04-24T11:23:17","guid":{"rendered":"https:\/\/isaac-global.com\/?p=250414"},"modified":"2025-07-03T16:24:16","modified_gmt":"2025-07-03T16:24:16","slug":"how-does-an-active-mass-damper-work-6","status":"publish","type":"post","link":"https:\/\/isaac-global.com\/en\/how-does-an-active-mass-damper-work-6\/","title":{"rendered":"The 6 most common questions about Active Mass Damper"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; admin_label=&#8221;section&#8221; _builder_version=&#8221;4.16&#8243; custom_margin=&#8221;14px|||||&#8221; custom_padding=&#8221;2px||0px|||&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row admin_label=&#8221;row&#8221; _builder_version=&#8221;4.16&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221; min_height=&#8221;473.1px&#8221; custom_margin=&#8221;|auto|-8px|auto||&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; custom_padding=&#8221;|||&#8221; global_colors_info=&#8221;{}&#8221; custom_padding__hover=&#8221;|||&#8221;][et_pb_text admin_label=&#8221;Text&#8221; _builder_version=&#8221;4.20.2&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h3><span data-contrast=\"auto\" style=\"color: #000000;\">The 6 most common questions about Active Mass Damper. And how ISAAC replies. <\/span><\/h3>\n<p><span data-contrast=\"auto\" style=\"color: #000000;\"><\/span><\/p>\n<p> <span style=\"color: #000000;\">In this article we have collected and organized the answers to the main questions received from our interlocutors, with the aim of providing a clear and up-to-date tool for better understanding ISAAC solutions. <\/span><\/p>\n<p>&nbsp;<\/p>\n<p><strong><span style=\"color: #000000;\">We will address the following topics:<\/span><\/strong><\/p>\n<p><span style=\"color: #000000;\">1. Reliability (safety)<\/span><\/p>\n<p><span style=\"color: #000000;\">2. What happens if there is no power supply?<\/span><\/p>\n<p><span style=\"color: #000000;\">3. How does it interface with an existing slab?<\/span><\/p>\n<p><span style=\"color: #000000;\">4. How can the system be tested?<\/span><\/p>\n<p><span style=\"color: #000000;\">5. Can it be installed on any building?<\/span><\/p>\n<p><span style=\"color: #000000;\">6. What it takes to do a free feasibility study<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><strong><span style=\"color: #000000;\">1. Reliability and safety<\/span><\/strong><\/p>\n<p><span style=\"color: #000000;\">The reliability of ISAAC system is based on redundancy principles and software control. Activation occurs only when at least 80% of the measurement nodes detect an acceleration greater than the default threshold. In the presence of a seismic event, the motors activate the mechanical axes generating stabilising forces calculated deterministically, automatically excluding nodes with inconsistent readings.  <\/span><\/p>\n<p><span style=\"color: #000000;\">Structural accelerations are monitored by measuring nodes each equipped with three triaxial accelerometers. If one of these sensors provides inconsistent data, the system will ignore the signal and report the need for maintenance. If at least two of the three sensors are inconsistent, the whole node is disabled.  <\/span><\/p>\n<p><span style=\"color: #000000;\">The system is managed by a PLC that controls different drives responsible for driving the electric motors of the inertial axes. The management software is divided into modules which communicate with each other through global variables. The control panel is locked, while access to the user interface is restricted by password.  <\/span><\/p>\n<p><span style=\"color: #000000;\">Each mechanical axle is protected by two limiting systems: one software and one mechanical. The software limitation occurs when the moving mass is too close to the limit, triggering a safety brake. The mechanical limitation consists of a bumper that stops the travel of the mass. In case of contact with the bumper, the axle is deactivated immediately. The system can also operate in &#8220;reduced performance&#8221; mode if an axle has anomalies. Both restrictions are necessary for safety reasons. However, if precise and conscious design is carried out, they are never achieved.      <\/span><\/p>\n<p><span style=\"color: #000000;\">Each actuator is tested both in the factory and in the field, to verify the correct delivery of the reference force. The system incorporates safety logics that monitor in real time the energy dissipation capacity and the correct functioning of the mechanical axes. All components are experimentally validated during field testing.  <\/span><\/p>\n<p><span style=\"color: #000000;\">Finally, the software is designed to be fail-safe, ensuring that safety is maintained even in the event of failure. Extensive tests were carried out, including in-plant testing and dynamic tests on real structures subjected to simulated earthquakes, with positive results. <\/span><\/p>\n<p>&nbsp;<\/p>\n<p><strong><span style=\"color: #000000;\">2. What happens if there is no power supply?<\/span><\/strong><\/p>\n<p><span style=\"color: #000000;\">Each mechanical axis, with its sensors and control electronics, is powered by a battery pack. The batteries are kept constantly charged through the mains. In case of power failure, they are able to guarantee the operation of the system both during the main earthquake (main shock), and during any subsequent shocks, such as in the case of a seismic swarm.  <\/span><\/p>\n<p>&nbsp;<\/p>\n<p><strong><span style=\"color: #000000;\">3. How does it interface with an existing slab?<\/span><\/strong><\/p>\n<p><span style=\"color: #000000;\">The mobile mass has a weight that varies between 200 and 1000\/1100kg, the carter and the rest of the machine system makes the device reach a maximum of 1150\/1250kg. The machine has a footprint of 70cm for 2.5\/4m, and tends to be around 3.0m\/ 3.5m for maximum masses. This means that the weight of the machine per linear metre is about 1250kg\/3.5m=360kg\/ml. Given that roofs normally have a load capacity of between 300 and 400 kg\/m2, in most cases there is no need for reinforcement of the existing structure.   <\/span><\/p>\n<p><span style=\"color: #000000;\"><\/span><\/p>\n<p style=\"text-align: center;\">\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.20.2&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;74px||3px|||&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row _builder_version=&#8221;4.20.2&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;-70px|auto||auto||&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.20.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_button button_url=&#8221;https:\/\/isaacantisismica.myfreshworks.com\/crm\/sales\/web_forms\/675c97f781e03cf88f06385579f0ac1c9a76108b7f167e3af04b781019da224b\/form.html?1739374535635&#8243; url_new_window=&#8221;on&#8221; button_text=&#8221;Book a dedicated call or appointment&#8221; button_alignment=&#8221;center&#8221; _builder_version=&#8221;4.20.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_button][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; admin_label=&#8221;section&#8221; _builder_version=&#8221;4.16&#8243; custom_margin=&#8221;14px|||||&#8221; custom_padding=&#8221;2px||0px|||&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row admin_label=&#8221;row&#8221; _builder_version=&#8221;4.16&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221; min_height=&#8221;1164.1px&#8221; custom_margin=&#8221;|auto|-9px|auto||&#8221; custom_padding=&#8221;5px||18px|||&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; custom_padding=&#8221;|||&#8221; global_colors_info=&#8221;{}&#8221; custom_padding__hover=&#8221;|||&#8221;][et_pb_text admin_label=&#8221;Text&#8221; _builder_version=&#8221;4.20.2&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p><strong><span style=\"color: #000000;\">4. How can the system be tested?<\/span><\/strong><\/p>\n<p><span style=\"color: #000000;\">The testing of the system is divided into two parts:<\/span><\/p>\n<p><span style=\"color: #000000;\">\u00b7 Internal factory testing<\/span><\/p>\n<p><span style=\"color: #000000;\">\u00b7 On site testing<\/span><\/p>\n<p><span style=\"color: #000000;\">The internal test allows you to check the entire electronic components, ensuring their proper functioning before the installation of electrical panels. On-site testing, on the other hand, confirms the overall effectiveness of the system directly on the structure. In addition, by using vibrodine, it is possible to measure the impact of the system in terms of vibration damping.  <\/span><\/p>\n<p><span style=\"color: #000000;\"><\/span><\/p>\n<p><span style=\"color: #000000;\"><\/span><\/p>\n<p><strong><span style=\"color: #000000;\">5. Can it be installed on any building?<\/span><\/strong><\/p>\n<p><span style=\"color: #000000;\">The active control system can be installed almost on any building. The first basic technical requirement is a flat surface. The inertial axes must work on a horizontal surface to exert the control forces necessary to reduce the oscillations of the structure. They are usually placed on the roof (if it is flat), or in an attic floor.   <\/span><\/p>\n<p><span style=\"color: #000000;\">For the application of the system to a masonry building, this shall be considered on a case-by-case basis. Indeed, in order to allow the correct operation of the axles and an adequate distribution of the control force, the structure must guarantee a scattering behaviour. <\/span><\/p>\n<p>&nbsp;<\/p>\n<p><strong><span style=\"color: #000000;\">6. What does it take to do a free feasibility study?<\/span><\/strong><\/p>\n<p><span style=\"color: #000000;\">The basic data of the structure is required for a feasibility study:<\/span><\/p>\n<p><span style=\"color: #000000;\">\u00b7 Site details<\/span><\/p>\n<p><span style=\"color: #000000;\">\u00b7 Construction material<\/span><\/p>\n<p><span style=\"color: #000000;\">\u00b7 Size and number of floor of the structure<\/span><\/p>\n<p><span style=\"color: #000000;\">\u00b7 Type of cover (or roof)<\/span><\/p>\n<p><span style=\"color: #000000;\">\u00b7 Drawings of the structure<\/span><\/p>\n<p><span style=\"color: #000000;\">\u00b7 Initial state estimate (IS-V) and target to be achieved<\/span><\/p>\n<p><span style=\"color: #000000;\">\u00b7 Budget<\/span><\/p>\n<p><span style=\"color: #000000;\">These parameters are the minimum necessary for a rough estimate of the effectiveness of the control system. For a more accurate prefeasibility study, other information may be used if available: <\/span><\/p>\n<p><span style=\"color: #000000;\">\u00b7 Modal analysis of the structure<\/span><\/p>\n<p><span style=\"color: #000000;\">\u00b7 Initial vulnerability study<\/span><\/p>\n<p><span style=\"color: #000000;\">\u00b7 Possible improvement\/adaptation projects with traditional techniques<\/span><\/p>\n<p><span style=\"color: #000000;\">\u00b7 Any finite element models<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h3 style=\"text-align: center;\"><span style=\"color: #000000;\">Contacts and information request<\/span><\/h3>\n<p><span style=\"color: #000000;\"><\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"color: #000000;\">ISAAC technologies are a concrete and effective response to the growing need for seismic safety.<\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"color: #000000;\">If you would like a personalized assessment or would like to learn more about a specific case, please contact us: we will be happy to support you.<\/span><\/p>\n<p style=\"text-align: center;\">\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.20.2&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;74px||3px|||&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row _builder_version=&#8221;4.20.2&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;-70px|auto||auto||&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.20.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_button button_url=&#8221;https:\/\/isaacantisismica.myfreshworks.com\/crm\/sales\/web_forms\/675c97f781e03cf88f06385579f0ac1c9a76108b7f167e3af04b781019da224b\/form.html?1739374535635&#8243; url_new_window=&#8221;on&#8221; button_text=&#8221;Book a free concultancy&#8221; button_alignment=&#8221;center&#8221; _builder_version=&#8221;4.20.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_button][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The 6 most common questions about Active Mass Damper. And how ISAAC replies. In this article we have collected and organized the answers to the main questions received from our interlocutors, with the aim of providing a clear and up-to-date tool for better understanding ISAAC solutions. &nbsp; We will address the following topics: 1. Reliability [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":250283,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[114,76],"tags":[],"class_list":["post-250414","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-anti-seismic-culture","category-technologies-and-techniques"],"yoast_head":"<title>The 6 most common questions about Active Mass Damper -<\/title>\n<meta name=\"description\" content=\"What are the most common questions about Active Mass Dampers? And how does ISAAC answer them? 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