{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T02:31:30Z","timestamp":1760149890454,"version":"build-2065373602"},"reference-count":43,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2023,9,21]],"date-time":"2023-09-21T00:00:00Z","timestamp":1695254400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Natural Science Foundation of China","award":["12172291","12272283","ZYTS23053"],"award-info":[{"award-number":["12172291","12272283","ZYTS23053"]}]},{"name":"Fundamental Research Funds for the Central Universities","award":["12172291","12272283","ZYTS23053"],"award-info":[{"award-number":["12172291","12272283","ZYTS23053"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Entropy"],"abstract":"<jats:p>The inherent non-smoothness of the vibroimpact system leads to complex behaviors and a strong sensitivity to parameter changes. Unfortunately, uncertainties and errors in system parameters are inevitable in mechanical engineering. Therefore, investigations of dynamical behaviors for vibroimpact systems with stochastic parameters are highly essential. The present study aims to analyze the dynamical characteristics of the three-degree-of-freedom vibroimpact system with an uncertain parameter by means of the Chebyshev polynomial approximation method. Specifically, the vibroimpact system model considered is one with unilateral constraint. Firstly, the three-degree-of-freedom vibroimpact system with an uncertain parameter is transformed into an equivalent deterministic form using the Chebyshev orthogonal approximation. Then, the ensemble means responses of the stochastic vibroimpact system are derived. Numerical simulations are performed to verify the effectiveness of the approximation method. Furthermore, the periodic and chaos motions under different system parameters are investigated, and the bifurcations of the vibroimpact system are analyzed with the Poincar\u00e9 map. The results demonstrate that both the restitution coefficient and the random factor can induce the appearance of the periodic bifurcation. It is worth noting that the bifurcations fundamentally differ between the stochastic and deterministic systems. The former has a bifurcation interval, while the latter occurs at a critical point.<\/jats:p>","DOI":"10.3390\/e25091365","type":"journal-article","created":{"date-parts":[[2023,9,21]],"date-time":"2023-09-21T21:08:36Z","timestamp":1695330516000},"page":"1365","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Response Analysis of the Three-Degree-of-Freedom Vibroimpact System with an Uncertain Parameter"],"prefix":"10.3390","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9768-4802","authenticated-orcid":false,"given":"Guidong","family":"Yang","sequence":"first","affiliation":[{"name":"Department of Engineering Mechanics, Northwestern Polytechnical University, Xi\u2019an 710129, China"},{"name":"School of Mathematics and Statistics, Xidian University, Xi\u2019an 710071, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zichen","family":"Deng","sequence":"additional","affiliation":[{"name":"Department of Engineering Mechanics, Northwestern Polytechnical University, Xi\u2019an 710129, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lin","family":"Du","sequence":"additional","affiliation":[{"name":"School of Mathematics and Statistics, Northwestern Polytechnical University, Xi\u2019an 710129, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zicheng","family":"Lin","sequence":"additional","affiliation":[{"name":"School of Mathematics and Statistics, Xidian University, Xi\u2019an 710071, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2023,9,21]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"229","DOI":"10.1023\/B:NODY.0000045510.93602.ca","article-title":"Random vibrations with impacts: A review","volume":"36","author":"Dimentberg","year":"2004","journal-title":"Nonlinear Dyn."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"104371","DOI":"10.1016\/j.ijimpeng.2022.104371","article-title":"Experimental analysis of dynamic behavior of elastic visco-plastic beam under repeated mass impacts","volume":"171","author":"Guo","year":"2023","journal-title":"Int. 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