{"id":211,"date":"2021-11-11T05:03:08","date_gmt":"2021-11-11T05:03:08","guid":{"rendered":"https:\/\/labs.ri.cmu.edu\/moonranger\/?p=211"},"modified":"2021-11-16T20:20:48","modified_gmt":"2021-11-16T20:20:48","slug":"roving-hammer-testing","status":"publish","type":"post","link":"https:\/\/labs.ri.cmu.edu\/moonranger\/roving-hammer-testing\/","title":{"rendered":"Roving Hammer Testing"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"211\" class=\"elementor elementor-211\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-1887792 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"1887792\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-36461aa\" data-id=\"36461aa\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-2f4d140 elementor-widget elementor-widget-heading\" data-id=\"2f4d140\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<p class=\"elementor-heading-title elementor-size-default\">Figure 1: Inverted chassis prepared for hammer testing<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-62575c3 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"62575c3\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-04d8862\" data-id=\"04d8862\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-51553be elementor-widget elementor-widget-heading\" data-id=\"51553be\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<p class=\"elementor-heading-title elementor-size-default\">A roving hammer test is the simplest way to determine natural frequencies of a structure.<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-526dcd8 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"526dcd8\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-70ba117\" data-id=\"70ba117\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-9e02645 elementor-widget elementor-widget-text-editor\" data-id=\"9e02645\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">The structure is tapped with a small hammer, and the resulting frequencies are sensed through instrumentation. It is a bit like striking a bell and sensing the frequency of its vibration by observing the resulting tone. To survive the shaking of launch, it is important for MoonRanger\u2019s lowest frequency to be above 100 Hz, which is only achieved by being sufficiently stiff and light.\u00a0\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">These roving hammer tests revealed MoonRanger\u2019s natural frequencies and the corresponding mode shapes (Figure 1). The testing turned MoonRanger upside down, bolted it in the manner that will attach it to its lander,\u00a0 and tapped on its belly. This resulted in response frequencies of 107, 119, and 170Hz (Figure 3). The resulting mode shapes (Figure 2) agree with results from Ansys dynamic analysis, but the frequencies at which these modes occur contrast with results from earlier vibration tests.<\/span><\/p><p><span style=\"font-weight: 400;\">Separate testing was conducted by tapping a wheel module. The modes detected agreed in shape and frequency with results from vibration testing and Ansys dynamic analysis. The first mode for the old wheel module was 127 Hz (vs 135 Hz from vibration testing). The first mode for the new wheel module (with 60mm width wheel) was 142 Hz. <\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-56abbc6\" data-id=\"56abbc6\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-4bb4bab elementor-widget elementor-widget-image\" data-id=\"4bb4bab\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"341\" height=\"347\" src=\"https:\/\/labs.ri.cmu.edu\/moonranger\/wp-content\/uploads\/sites\/24\/2021\/11\/hammer-test-crop.jpg\" class=\"attachment-medium_large size-medium_large wp-image-214\" alt=\"\" srcset=\"https:\/\/labs.ri.cmu.edu\/moonranger\/wp-content\/uploads\/sites\/24\/2021\/11\/hammer-test-crop.jpg 341w, https:\/\/labs.ri.cmu.edu\/moonranger\/wp-content\/uploads\/sites\/24\/2021\/11\/hammer-test-crop-295x300.jpg 295w\" sizes=\"(max-width: 341px) 100vw, 341px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 1.5: Blue wires convey data from accelerometers for measuring the frequency and magnitude of vibration. The handheld hammer is shown prior to tapping the inverted chassis.  <\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-860cd11 elementor-widget elementor-widget-image\" data-id=\"860cd11\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"768\" height=\"550\" src=\"https:\/\/labs.ri.cmu.edu\/moonranger\/wp-content\/uploads\/sites\/24\/2021\/11\/image2-2-768x550.png\" class=\"attachment-medium_large size-medium_large wp-image-213\" alt=\"\" srcset=\"https:\/\/labs.ri.cmu.edu\/moonranger\/wp-content\/uploads\/sites\/24\/2021\/11\/image2-2-768x550.png 768w, https:\/\/labs.ri.cmu.edu\/moonranger\/wp-content\/uploads\/sites\/24\/2021\/11\/image2-2-300x215.png 300w, https:\/\/labs.ri.cmu.edu\/moonranger\/wp-content\/uploads\/sites\/24\/2021\/11\/image2-2.png 854w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 2 - Areas of maximum displacement shown in red for MoonRanger\u2019s 1st mode<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Figure 1: Inverted chassis prepared for hammer testing A roving hammer test is the simplest way to determine natural frequencies of a structure. The structure is tapped with a small hammer, and the resulting frequencies are sensed through instrumentation. It is a bit like striking a bell and sensing the frequency of its vibration by &hellip; <a href=\"https:\/\/labs.ri.cmu.edu\/moonranger\/roving-hammer-testing\/\">Continued<\/a><\/p>\n","protected":false},"author":2,"featured_media":215,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[24,25],"tags":[],"class_list":["post-211","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-backstory","category-mechanical"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Roving Hammer Testing - MoonRanger<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/labs.ri.cmu.edu\/moonranger\/roving-hammer-testing\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Roving Hammer Testing - MoonRanger\" \/>\n<meta property=\"og:description\" content=\"Figure 1: Inverted chassis prepared for hammer testing A roving hammer test is the simplest way to determine natural frequencies of a structure. The structure is tapped with a small hammer, and the resulting frequencies are sensed through instrumentation. It is a bit like striking a bell and sensing the frequency of its vibration by &hellip; Continued\" \/>\n<meta property=\"og:url\" content=\"https:\/\/labs.ri.cmu.edu\/moonranger\/roving-hammer-testing\/\" \/>\n<meta property=\"og:site_name\" content=\"MoonRanger\" \/>\n<meta property=\"article:published_time\" content=\"2021-11-11T05:03:08+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-11-16T20:20:48+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/labs.ri.cmu.edu\/moonranger\/wp-content\/uploads\/sites\/24\/2021\/11\/hammer-test-brightened.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1088\" \/>\n\t<meta property=\"og:image:height\" content=\"705\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"bstaszel\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"bstaszel\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/labs.ri.cmu.edu\/moonranger\/roving-hammer-testing\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/labs.ri.cmu.edu\/moonranger\/roving-hammer-testing\/\"},\"author\":{\"name\":\"bstaszel\",\"@id\":\"https:\/\/labs.ri.cmu.edu\/moonranger\/#\/schema\/person\/927370540dbdb2168a8dafc93bc20ebc\"},\"headline\":\"Roving Hammer Testing\",\"datePublished\":\"2021-11-11T05:03:08+00:00\",\"dateModified\":\"2021-11-16T20:20:48+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/labs.ri.cmu.edu\/moonranger\/roving-hammer-testing\/\"},\"wordCount\":258,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/labs.ri.cmu.edu\/moonranger\/#organization\"},\"image\":{\"@id\":\"https:\/\/labs.ri.cmu.edu\/moonranger\/roving-hammer-testing\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/labs.ri.cmu.edu\/moonranger\/wp-content\/uploads\/sites\/24\/2021\/11\/hammer-test-brightened.jpg\",\"articleSection\":[\"Backstory\",\"Mechanical\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/labs.ri.cmu.edu\/moonranger\/roving-hammer-testing\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/labs.ri.cmu.edu\/moonranger\/roving-hammer-testing\/\",\"url\":\"https:\/\/labs.ri.cmu.edu\/moonranger\/roving-hammer-testing\/\",\"name\":\"Roving Hammer Testing - 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The structure is tapped with a small hammer, and the resulting frequencies are sensed through instrumentation. 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