Experimental Verification of DAS Vibration Response Characteristics of Equal Strength Beam under Sinusoidal Excitation

Experimental Verification of DAS Vibration Response Characteristics of Equal Strength Beam under Sinusoidal Excitation | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Experimental Verification of DAS Vibration Response Characteristics of Equal Strength Beam under Sinusoidal Excitation Chenyang Ma, Jing Chai, Dingding Zhang, Zhi Lei, Lei Gao This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8615591/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 12 Apr, 2026 Read the published version in Scientific Reports → Version 1 posted 11 You are reading this latest preprint version Abstract Distributed Acoustic Sensing (DAS) technology holds great potential for structural dynamic monitoring; however, its quantitative capability for complex dynamic strain fields and the reliability of spatial resolution require systematic verification. This study employed a systematic “theoretical modeling–simulation analysis–experimental verification” approach, using an equal-strength beam under sinusoidal excitation to investigate the dynamic response characteristics of DAS. A complete dynamic strain transfer model from external excitation to DAS phase-change signals was established, defining the phase sensitivity coefficient as a key parameter for quantitative analysis. Finite element simulations revealed that while the beam's strain is approximately uniform at low frequencies (< 5 Hz), it exhibits a gradient distribution—large near the fixed end and small near the free end—near the natural frequency, departing from the static “equal-strain” characteristic. Experimental results under 5 Hz excitation, utilizing synchronized measurements from accelerometers, FBG sensors, and DAS, demonstrated that DAS accurately captures the dominant vibration frequency. The measured phase sensitivity coefficient showed only a 4.82% error relative to theory, the response amplitude maintained high linearity with excitation and reference signals (R² ≥ 0.99), and the phase delay was negligible (0.02 rad). Furthermore, by comparing DAS channel response ratios across spatial positions with theoretical strain ratios, the study confirmed DAS’s ability to quantitatively resolve spatial differences in dynamic strain distribution. This work systematically validates the quantitative accuracy and reliability of DAS as a distributed dynamic strain sensing tool, and the revealed dynamic-static strain distribution differences, together with the established validation methodology, provide solid theoretical and experimental support for refined DAS-based monitoring in engineering structure dynamic monitoring scenarios. Physical sciences/Engineering Physical sciences/Materials science Physical sciences/Physics Distributed Acoustic Sensing (DAS) Equal-strength beam Dynamic strain monitoring Vibration response characteristics Phase sensitivity coefficient Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 12 Apr, 2026 Read the published version in Scientific Reports → Version 1 posted Editorial decision: Revision requested 13 Feb, 2026 Reviews received at journal 13 Feb, 2026 Reviewers agreed at journal 13 Feb, 2026 Reviews received at journal 10 Feb, 2026 Reviewers agreed at journal 09 Feb, 2026 Reviewers agreed at journal 23 Jan, 2026 Reviewers invited by journal 23 Jan, 2026 Editor invited by journal 20 Jan, 2026 Editor assigned by journal 17 Jan, 2026 Submission checks completed at journal 17 Jan, 2026 First submitted to journal 16 Jan, 2026 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-8615591","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":577484900,"identity":"8c17771b-45d0-41ca-a077-2e19a72d5044","order_by":0,"name":"Chenyang 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Acoustic Sensing (DAS), Equal-strength beam, Dynamic strain monitoring, Vibration response characteristics, Phase sensitivity coefficient","lastPublishedDoi":"10.21203/rs.3.rs-8615591/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-8615591/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eDistributed Acoustic Sensing (DAS) technology holds great potential for structural dynamic monitoring; however, its quantitative capability for complex dynamic strain fields and the reliability of spatial resolution require systematic verification. This study employed a systematic \u0026ldquo;theoretical modeling\u0026ndash;simulation analysis\u0026ndash;experimental verification\u0026rdquo; approach, using an equal-strength beam under sinusoidal excitation to investigate the dynamic response characteristics of DAS. A complete dynamic strain transfer model from external excitation to DAS phase-change signals was established, defining the phase sensitivity coefficient as a key parameter for quantitative analysis. Finite element simulations revealed that while the beam's strain is approximately uniform at low frequencies (\u0026lt;\u0026thinsp;5 Hz), it exhibits a gradient distribution\u0026mdash;large near the fixed end and small near the free end\u0026mdash;near the natural frequency, departing from the static \u0026ldquo;equal-strain\u0026rdquo; characteristic.\u003c/p\u003e \u003cp\u003eExperimental results under 5 Hz excitation, utilizing synchronized measurements from accelerometers, FBG sensors, and DAS, demonstrated that DAS accurately captures the dominant vibration frequency. The measured phase sensitivity coefficient showed only a 4.82% error relative to theory, the response amplitude maintained high linearity with excitation and reference signals (R\u0026sup2; \u0026ge; 0.99), and the phase delay was negligible (0.02 rad). Furthermore, by comparing DAS channel response ratios across spatial positions with theoretical strain ratios, the study confirmed DAS\u0026rsquo;s ability to quantitatively resolve spatial differences in dynamic strain distribution. This work systematically validates the quantitative accuracy and reliability of DAS as a distributed dynamic strain sensing tool, and the revealed dynamic-static strain distribution differences, together with the established validation methodology, provide solid theoretical and experimental support for refined DAS-based monitoring in engineering structure dynamic monitoring scenarios.\u003c/p\u003e","manuscriptTitle":"Experimental Verification of DAS Vibration Response Characteristics of Equal Strength Beam under Sinusoidal Excitation","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2026-01-21 17:37:43","doi":"10.21203/rs.3.rs-8615591/v1","editorialEvents":[{"type":"communityComments","content":0},{"type":"decision","content":"Revision requested","date":"2026-02-13T08:37:04+00:00","index":"","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2026-02-13T07:45:59+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"152945405080351368726733907583397670482","date":"2026-02-13T07:43:44+00:00","index":"hide","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2026-02-11T03:00:02+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"267881070452564054889917582052451919569","date":"2026-02-09T16:27:34+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"219043244919194930128731522234824732157","date":"2026-01-24T03:05:30+00:00","index":"hide","fulltext":""},{"type":"reviewersInvited","content":"","date":"2026-01-24T02:05:38+00:00","index":"","fulltext":""},{"type":"editorInvited","content":"","date":"2026-01-20T12:47:34+00:00","index":"","fulltext":""},{"type":"editorAssigned","content":"","date":"2026-01-17T11:45:00+00:00","index":"","fulltext":""},{"type":"checksComplete","content":"","date":"2026-01-17T11:44:46+00:00","index":"","fulltext":""},{"type":"submitted","content":"Scientific Reports","date":"2026-01-16T05:23:14+00:00","index":"","fulltext":""}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"scientific-reports","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"scirep","sideBox":"Learn more about [Scientific Reports](http://www.nature.com/srep/)","snPcode":"","submissionUrl":"","title":"Scientific Reports","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"stoa","reportingPortfolio":"Scientific Reports","inReviewEnabled":true,"inReviewRevisionsEnabled":true}}],"origin":"","ownerIdentity":"2cf10281-96a8-4132-8dc1-9780461747f9","owner":[],"postedDate":"January 21st, 2026","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"published-in-journal","subjectAreas":[{"id":61439443,"name":"Physical sciences/Engineering"},{"id":61439444,"name":"Physical sciences/Materials science"},{"id":61439445,"name":"Physical sciences/Physics"}],"tags":[],"updatedAt":"2026-04-13T16:02:22+00:00","versionOfRecord":{"articleIdentity":"rs-8615591","link":"https://doi.org/10.1038/s41598-026-47097-2","journal":{"identity":"scientific-reports","isVorOnly":false,"title":"Scientific Reports"},"publishedOn":"2026-04-12 15:58:59","publishedOnDateReadable":"April 12th, 2026"},"versionCreatedAt":"2026-01-21 17:37:43","video":"","vorDoi":"10.1038/s41598-026-47097-2","vorDoiUrl":"https://doi.org/10.1038/s41598-026-47097-2","workflowStages":[]},"version":"v1","identity":"rs-8615591","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-8615591","identity":"rs-8615591","version":["v1"]},"buildId":"XKTyCvWXoU3ODBz1xrDgd","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}