A Nonlinear Model and Parameter Identification Method for Rubber Isolators under Shock Excitation in Underwater Vehicles

Rubber isolators are usually used to protect high-precision equipment of autonomous underwater vehicles (AUVs), avoiding damage from overlarge dynamic excitation. Considering the nonlinear properties of the rubber material, the nonlinear behavior of rubber isolators under shock exaltation is hard to...

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Autores principales:	Heye Xiao, Chizhen Xu, Ruobing Wang, Peixun Yu, Jie Zhou, Junqiang Bai
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	rubber isolator nonlinear behavior parameter identification method multilayer feed-forward neural network fractional-order method underwater vehicle Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581
Acceso en línea:	https://doaj.org/article/b0d1567c76af4c629a904e90a338731e
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spelling	oai:doaj.org-article:b0d1567c76af4c629a904e90a338731e2021-11-25T18:05:03ZA Nonlinear Model and Parameter Identification Method for Rubber Isolators under Shock Excitation in Underwater Vehicles10.3390/jmse91112822077-1312https://doaj.org/article/b0d1567c76af4c629a904e90a338731e2021-11-01T00:00:00Zhttps://www.mdpi.com/2077-1312/9/11/1282https://doaj.org/toc/2077-1312Rubber isolators are usually used to protect high-precision equipment of autonomous underwater vehicles (AUVs), avoiding damage from overlarge dynamic excitation. Considering the nonlinear properties of the rubber material, the nonlinear behavior of rubber isolators under shock exaltation is hard to be predict accurately without the available modal and accurate parameters. In view of this, the present study proposes a nonlinear model and parameter identification method of rubber isolators to present their transient responses under shock excitation. First, a nonlinear model of rubber isolators is introduced for simulating their amplitude and frequency-dependent deformation under shock excitation. A corresponding dynamic equation of the isolation system is proposed and analytically solved by the Newmark method and the Newton-arithmetic mean method. Secondly, a multilayer feed-forward neural network (MFFNN) is constructed with the current model to search the parameters, in which the differences between the estimated and tested responses are minimized. The sine-sweep and drop test are planned with MFFNN to build the parameter identification process of rubber isolators. Then, a T-shaped isolator composed of high-damping silicon rubber is selected as a sample, and its parameters were determined by the current identification process. The transient responses of the isolation system are reconstructed by the current mode with the identified parameter, which show good agreement with measured responses. The accuracy of the proposed model and parameter identification method is proved. Finally, the errors between the reconstructed responses and tested responses are analyzed, and the main mode of energy attenuation in the rubber isolator is discussed in order to provide an inside view of the current model.Heye XiaoChizhen XuRuobing WangPeixun YuJie ZhouJunqiang BaiMDPI AGarticlerubber isolatornonlinear behaviorparameter identification methodmultilayer feed-forward neural networkfractional-order methodunderwater vehicleNaval architecture. Shipbuilding. Marine engineeringVM1-989OceanographyGC1-1581ENJournal of Marine Science and Engineering, Vol 9, Iss 1282, p 1282 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	rubber isolator nonlinear behavior parameter identification method multilayer feed-forward neural network fractional-order method underwater vehicle Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581
spellingShingle	rubber isolator nonlinear behavior parameter identification method multilayer feed-forward neural network fractional-order method underwater vehicle Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581 Heye Xiao Chizhen Xu Ruobing Wang Peixun Yu Jie Zhou Junqiang Bai A Nonlinear Model and Parameter Identification Method for Rubber Isolators under Shock Excitation in Underwater Vehicles
description	Rubber isolators are usually used to protect high-precision equipment of autonomous underwater vehicles (AUVs), avoiding damage from overlarge dynamic excitation. Considering the nonlinear properties of the rubber material, the nonlinear behavior of rubber isolators under shock exaltation is hard to be predict accurately without the available modal and accurate parameters. In view of this, the present study proposes a nonlinear model and parameter identification method of rubber isolators to present their transient responses under shock excitation. First, a nonlinear model of rubber isolators is introduced for simulating their amplitude and frequency-dependent deformation under shock excitation. A corresponding dynamic equation of the isolation system is proposed and analytically solved by the Newmark method and the Newton-arithmetic mean method. Secondly, a multilayer feed-forward neural network (MFFNN) is constructed with the current model to search the parameters, in which the differences between the estimated and tested responses are minimized. The sine-sweep and drop test are planned with MFFNN to build the parameter identification process of rubber isolators. Then, a T-shaped isolator composed of high-damping silicon rubber is selected as a sample, and its parameters were determined by the current identification process. The transient responses of the isolation system are reconstructed by the current mode with the identified parameter, which show good agreement with measured responses. The accuracy of the proposed model and parameter identification method is proved. Finally, the errors between the reconstructed responses and tested responses are analyzed, and the main mode of energy attenuation in the rubber isolator is discussed in order to provide an inside view of the current model.
format	article
author	Heye Xiao Chizhen Xu Ruobing Wang Peixun Yu Jie Zhou Junqiang Bai
author_facet	Heye Xiao Chizhen Xu Ruobing Wang Peixun Yu Jie Zhou Junqiang Bai
author_sort	Heye Xiao
title	A Nonlinear Model and Parameter Identification Method for Rubber Isolators under Shock Excitation in Underwater Vehicles
title_short	A Nonlinear Model and Parameter Identification Method for Rubber Isolators under Shock Excitation in Underwater Vehicles
title_full	A Nonlinear Model and Parameter Identification Method for Rubber Isolators under Shock Excitation in Underwater Vehicles
title_fullStr	A Nonlinear Model and Parameter Identification Method for Rubber Isolators under Shock Excitation in Underwater Vehicles
title_full_unstemmed	A Nonlinear Model and Parameter Identification Method for Rubber Isolators under Shock Excitation in Underwater Vehicles
title_sort	nonlinear model and parameter identification method for rubber isolators under shock excitation in underwater vehicles
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/b0d1567c76af4c629a904e90a338731e
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_version_	1718411636372406272

A Nonlinear Model and Parameter Identification Method for Rubber Isolators under Shock Excitation in Underwater Vehicles

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