{"id":13919,"date":"2017-07-12T10:11:18","date_gmt":"2017-07-12T09:11:18","guid":{"rendered":"https:\/\/www.cetestgroup.com\/?page_id=13919"},"modified":"2023-04-18T09:57:44","modified_gmt":"2023-04-18T08:57:44","slug":"modal-analysis","status":"publish","type":"page","link":"https:\/\/www.cetestgroup.com\/us\/rail-tests\/noise-and-vibrations-testing-services\/modal-analysis\/","title":{"rendered":"Modal analysis"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row][vc_column]<div class=\"ult-spacer spacer-6a1803841fe4f\" data-id=\"6a1803841fe4f\" data-height=\"30\" data-height-mobile=\"20\" data-height-tab=\"20\" data-height-tab-portrait=\"\" data-height-mobile-landscape=\"\" style=\"clear:both;display:block;\"><\/div><div class=\"dfd-heading-shortcode\"><div class=\"dfd-heading-module-wrap  text-center style_01 dfd-heading-6a1803841ff12 dfd-disable-resposive-headings\" id=\"dfd-heading-6a1803841ff12\" ><div class=\"inline-block\"><div class=\"dfd-heading-module\"><h6 class=\"widget-title dfd-title \" style=\"font-family:PT Sans Narrow; font-weight:400; font-style:normal; font-size: 20px; color: #25bdd5 !important; line-height: 25px; \">Modal analysis testing uses the most appropriate techniques or those which comply with specific requirements to determine the natural frequencies, vibration modes and shapes of components and\/or vehicles.<\/h6><div class=\"dfd-heading-delimiter\"><\/div><\/div><\/div><\/div><script type=\"text\/javascript\">\r\n\t\t\t\t\t\t\t\t\t(function($) {\r\n\t\t\t\t\t\t\t\t\t\t$(\"head\").append(\"<style>.dfd-heading-6a1803841ff12.dfd-heading-module-wrap .dfd-heading-module .dfd-heading-delimiter {border-bottom-style:solid;border-bottom-width:1px;width:100px;border-bottom-color:#dddddd;}.dfd-heading-6a1803841ff12.dfd-heading-module-wrap .dfd-heading-module .dfd-heading-delimiter {margin-top:20px;margin-bottom:20px;}<\/style>\");\r\n\t\t\t\t\t\t\t\t\t})(jQuery);\r\n\t\t\t\t\t\t\t\t<\/script><\/div><div class=\"ult-spacer spacer-6a1803842000a\" data-id=\"6a1803842000a\" data-height=\"30\" data-height-mobile=\"20\" data-height-tab=\"20\" data-height-tab-portrait=\"\" data-height-mobile-landscape=\"\" style=\"clear:both;display:block;\"><\/div>[vc_row_inner][vc_column_inner][vc_column_text]CETEST offers on-track and laboratory modal analysis testing.[\/vc_column_text][\/vc_column_inner][\/vc_row_inner]<div class=\"ult-spacer spacer-6a18038420030\" data-id=\"6a18038420030\" data-height=\"30\" data-height-mobile=\"20\" data-height-tab=\"20\" data-height-tab-portrait=\"\" data-height-mobile-landscape=\"\" style=\"clear:both;display:block;\"><\/div>[vc_row_inner][vc_column_inner width=&#8221;1\/3&#8243;]<div class=\"ult-spacer spacer-6a18038420050\" data-id=\"6a18038420050\" data-height=\"20\" data-height-mobile=\"10\" data-height-tab=\"20\" data-height-tab-portrait=\"\" data-height-mobile-landscape=\"\" style=\"clear:both;display:block;\"><\/div>[vc_column_text]We perform <strong>Experimental Modal Analysis (EMA).<\/strong> This involves applying a known excitation to the component being studied by means of an instrumented hammer, shakers or through the relaxation method. This analysis is best-suited to elements of reduced dimensions or which present a low damping ratio.[\/vc_column_text]<div class=\"ult-spacer spacer-6a1803842006a\" data-id=\"6a1803842006a\" data-height=\"20\" data-height-mobile=\"10\" data-height-tab=\"20\" data-height-tab-portrait=\"\" data-height-mobile-landscape=\"\" style=\"clear:both;display:block;\"><\/div>[vc_column_text]We also perform <strong>Operational Modal Analysis (OMA) and Operational Modal Analysis in presence of eXogenous inputs (OMAX),<\/strong><br \/>\nwhere the system is studied in normal operation conditions and it is assumed that the excitation received can be modelled as white noise. This analysis is recommended for elements of large dimensions in which the ambient excitation is constant in the frequency range being studied, such as railway bridges.[\/vc_column_text][\/vc_column_inner][vc_column_inner width=&#8221;2\/3&#8243; css=&#8221;.vc_custom_1501153082267{padding-right: 5% !important;padding-left: 5% !important;}&#8221;]<div class=\"ult-spacer spacer-6a18038420086\" data-id=\"6a18038420086\" data-height=\"20\" data-height-mobile=\"20\" data-height-tab=\"20\" data-height-tab-portrait=\"\" data-height-mobile-landscape=\"\" style=\"clear:both;display:block;\"><\/div><div id=\"dfd-carousel-6a18038420146\" class=\"dfd-carousel-wrapper\"><div class=\"dfd-carousel-module-wrapper  dfd-carousel-horizontal dfd-arrows_aside2 dfdfillsquare dfd-arrows-style_4 dfd-arrows-enabled dfd-dots-enabled\" ><div class=\"dfd-carousel\">[vc_single_image image=&#8221;15945&#8243; img_size=&#8221;full&#8221; alignment=&#8221;center&#8221;][vc_single_image image=&#8221;16770&#8243; img_size=&#8221;full&#8221; alignment=&#8221;center&#8221;]<\/div><a href=\"#\" class=\"dfd-slider-control prev\" title=\"Previous slide\"><i class=\"dfd-added-font-icon-left-open2\"><\/i><\/a><a href=\"#\" class=\"dfd-slider-control next\" title=\"Next slide\"><i class=\"dfd-added-font-icon-right-open2\"><\/i><\/a><\/div>\t\t\t\t<script type=\"text\/javascript\">\r\n\t\t\t\t\t(function($) {\r\n\t\t\t\t\t\t\"use strict\";\r\n\t\t\t\t\t\tvar $carousel = $('#dfd-carousel-6a18038420146').find('.dfd-carousel');\r\n\t\t\t\t\t\t$(document).ready(function() {\r\n\t\t\t\t\t\t\tvar $initialized = ($('body').hasClass('page-template-tmp-side-by-side')) ? $carousel.not('.slick-initialized') : $carousel;\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t$carousel.siblings('.dfd-slider-control.prev').click(function(e) {\r\n\t\t\t\t\t\t\t\te.preventDefault();\r\n\t\t\t\t\t\t\t\t$carousel.eq(0).slick('slickPrev');\r\n\t\t\t\t\t\t\t});\r\n\t\t\t\t\t\t\t$carousel.siblings('.dfd-slider-control.next').click(function(e) {\r\n\t\t\t\t\t\t\t\te.preventDefault();\r\n\t\t\t\t\t\t\t\t$carousel.eq(0).slick('slickNext');\r\n\t\t\t\t\t\t\t});\r\n\t\t\t\t\t\t\t$initialized.slick({arrows: false,dotsClass: 'dfd-slick-dots',slidesToScroll: 1,autoplay: true,autoplaySpeed: 5000,dots: true,customPaging: function(slider, i) {\r\n\t\t\t\t\t\t\t\t\treturn '<span data-role=\"none\" role=\"button\" aria-required=\"false\" tabindex=\"0\"><\/span>';\r\n\t\t\t\t\t\t\t\t},infinite: true,slidesToShow: 1,speed: 300,swipe: true,draggable: true,adaptiveHeight: true,responsive: [\r\n\t\t\t\t\t\t\t{\r\n\t\t\t\t\t\t\t\tbreakpoint: 1024,\r\n\t\t\t\t\t\t\t\tsettings: {\r\n\t\t\t\t\t\t\t\t\tslidesToShow: 1,\r\n\t\t\t\t\t\t\t\t\tslidesToScroll: 1,\r\n\t\t\t\t\t\t\t\t}\r\n\t\t\t\t\t\t\t},\r\n\t\t\t\t\t\t\t{\r\n\t\t\t\t\t\t\t\tbreakpoint: 800,\r\n\t\t\t\t\t\t\t\tsettings: {\r\n\t\t\t\t\t\t\t\t\tslidesToShow: 1,\r\n\t\t\t\t\t\t\t\t\tslidesToScroll: 1,\r\n\t\t\t\t\t\t\t\t}\r\n\t\t\t\t\t\t\t},\r\n\t\t\t\t\t\t\t{\r\n\t\t\t\t\t\t\t\tbreakpoint: 480,\r\n\t\t\t\t\t\t\t\tsettings: {\r\n\t\t\t\t\t\t\t\t\tslidesToShow: 1,\r\n\t\t\t\t\t\t\t\t\tslidesToScroll: 1,\r\n\t\t\t\t\t\t\t\t}\r\n\t\t\t\t\t\t\t},]});\r\n\t\t\t\t\t\t\t$(\"head\").append(\"<style>#dfd-carousel-6a18038420146 > .dfd-carousel-module-wrapper > .dfd-carousel > .slick-list > .slick-track > .dfd-item-wrap > .cover {padding: 10px;}#dfd-carousel-6a18038420146 {margin: -10px;}<\/style>\")\t\t\t\t\t\t});\r\n\t\t\t\t\t})(jQuery);\r\n\t\t\t\t<\/script>\r\n            <\/div><div class=\"ult-spacer spacer-6a18038420210\" data-id=\"6a18038420210\" data-height=\"10\" data-height-mobile=\"10\" data-height-tab=\"10\" data-height-tab-portrait=\"\" data-height-mobile-landscape=\"\" style=\"clear:both;display:block;\"><\/div><div id=\"dfd-announce-6a1803842023d-7489\" class=\"dfd-announce-module-wrap align-left no_full_bg_class  style-3 layout-1\" ><div class=\"dfd-announce-module\"><div class=\"module-icon\" ><i class = \"dfd-icon-train_1\"><\/i><\/div><div class=\"module-text\" style=\"font-family:PT Sans; font-weight:400; font-style:normal; font-size: 18px; color: #25bdd5 !important; line-height: 22px; font-weight:bold; \">The developed method is based around simple instrumentation and can be performed in parallel with other on-track tests, reducing overall test costs to a minimum.<\/div><\/div><\/div><div class=\"ult-spacer spacer-6a18038420299\" data-id=\"6a18038420299\" data-height=\"20\" data-height-mobile=\"10\" data-height-tab=\"20\" data-height-tab-portrait=\"\" data-height-mobile-landscape=\"\" style=\"clear:both;display:block;\"><\/div>[\/vc_column_inner][\/vc_row_inner]<div class=\"ult-spacer spacer-6a180384202b5\" data-id=\"6a180384202b5\" data-height=\"30\" data-height-mobile=\"20\" data-height-tab=\"20\" data-height-tab-portrait=\"\" data-height-mobile-landscape=\"\" style=\"clear:both;display:block;\"><\/div>[vc_row_inner][vc_column_inner][vc_column_text]Finally, at CETEST we have developed a new method for obtaining the modal parameters of railway vehicles through on-track measurements (on-track modal analysis for railway vehicles). It identifies both the rigid solid modes associated with the suspension as well as the structural modes. The technique developed takes wheel-track interactions into account, a key component in railway dynamics that cannot be considered using other methods. Furthermore, the developed method is based around simple instrumentation and can be performed in parallel with other on-track tests, reducing overall test costs to a minimum.[\/vc_column_text][\/vc_column_inner][\/vc_row_inner]<div class=\"ult-spacer spacer-6a180384202cc\" data-id=\"6a180384202cc\" data-height=\"60\" data-height-mobile=\"20\" data-height-tab=\"30\" data-height-tab-portrait=\"\" data-height-mobile-landscape=\"\" style=\"clear:both;display:block;\"><\/div>[\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_column_text]CETEST offers on-track and laboratory modal analysis testing.[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner][vc_column_inner width=&#8221;1\/3&#8243;][vc_column_text]We perform Experimental Modal Analysis (EMA). This involves applying a known excitation to the component being studied by means of an instrumented<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":13872,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"tmp-page-right-sidebar.php","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-13919","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Modal analysis testing for railway industry - CETEST USA<\/title>\n<meta name=\"description\" content=\"Modal analysis testing uses the most appropriate techniques or those which comply with specific requirements to determine the natural frequencies, vibration modes and shapes of components and\/or vehicles. CETEST offers on-track and laboratory modal analysis testing. 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