The nonlinear response of a flexible structure, subjected to generally supported conditions with nonlinearities, is investigated for the first time. An analytical procedure is proposed first. Moreover, a simulation technique usually employed in static analysis is developed for confirmation. Generally, ordinary perturbation methods could analyze dynamics of flexible structures with linear boundary conditions. As nonlinear boundaries are taken into account, they are out of operation for the modal shape that is hardly to be obtained, which is the key to the analysis. In order to overcome this, nonlinear boundary conditions are rescaled and the technique of modal revision is employed. Consequently, each governing equation with different time-scales could be analyzed exactly according to corresponding rescaled boundary conditions. The total response of any point at the flexible structure will be composed by harmonic responses yielded by the analytical method. Furthermore, the differential quadrature element method (DQEM), a numerical simulation technique could satisfy boundary conditions strictly, is introduced to certify analytical results. The comparison shows a reasonable agreement between these two methods. In fact, the accuracy of the analytical method for nonlinear boundaries could be explained in theory. Based on the certification, boundary nonlinearities are discussed in detail analytically and found to play an important role in responses. Because of the important role played by the nonlinear factors in the vibration and control of the flexible structure, this paper will open the vibration analysis and numerical study of the flexible structure with nonlinear constraints.
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November 2017
Research-Article
Vibration of Flexible Structures Under Nonlinear Boundary Conditions
Xiao-Ye Mao,
Xiao-Ye Mao
Shanghai Institute of Applied
Mathematics and Mechanics,
Shanghai University,
149 Yan Chang Road,
Shanghai 200072, China
e-mail: maoxiaoye1987920@aliyun.com
Mathematics and Mechanics,
Shanghai University,
149 Yan Chang Road,
Shanghai 200072, China
e-mail: maoxiaoye1987920@aliyun.com
Search for other works by this author on:
Hu Ding,
Hu Ding
Shanghai Institute of Applied
Mathematics and Mechanics,
Shanghai University,
Shanghai 200072, China
e-mail: dinghu3@shu.edu.cn
Mathematics and Mechanics,
Shanghai University,
149 Yan Chang Road
,Shanghai 200072, China
e-mail: dinghu3@shu.edu.cn
Search for other works by this author on:
Li-Qun Chen
Li-Qun Chen
Shanghai Key Laboratory of Mechanics
in Energy Engineering,
Department of Mechanics,
Shanghai Institute of Applied
Mathematics and Mechanics,
Shanghai University,
Shanghai 200072, China
e-mail: lqchen@staff.shu.edu.cn
in Energy Engineering,
Department of Mechanics,
Shanghai Institute of Applied
Mathematics and Mechanics,
Shanghai University,
149 Yan Chang Road
,Shanghai 200072, China
e-mail: lqchen@staff.shu.edu.cn
Search for other works by this author on:
Xiao-Ye Mao
Shanghai Institute of Applied
Mathematics and Mechanics,
Shanghai University,
149 Yan Chang Road,
Shanghai 200072, China
e-mail: maoxiaoye1987920@aliyun.com
Mathematics and Mechanics,
Shanghai University,
149 Yan Chang Road,
Shanghai 200072, China
e-mail: maoxiaoye1987920@aliyun.com
Hu Ding
Shanghai Institute of Applied
Mathematics and Mechanics,
Shanghai University,
Shanghai 200072, China
e-mail: dinghu3@shu.edu.cn
Mathematics and Mechanics,
Shanghai University,
149 Yan Chang Road
,Shanghai 200072, China
e-mail: dinghu3@shu.edu.cn
Li-Qun Chen
Shanghai Key Laboratory of Mechanics
in Energy Engineering,
Department of Mechanics,
Shanghai Institute of Applied
Mathematics and Mechanics,
Shanghai University,
Shanghai 200072, China
e-mail: lqchen@staff.shu.edu.cn
in Energy Engineering,
Department of Mechanics,
Shanghai Institute of Applied
Mathematics and Mechanics,
Shanghai University,
149 Yan Chang Road
,Shanghai 200072, China
e-mail: lqchen@staff.shu.edu.cn
1Corresponding author.
Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received August 9, 2017; final manuscript received September 6, 2017; published online September 21, 2017. Editor: Yonggang Huang.
J. Appl. Mech. Nov 2017, 84(11): 111006 (11 pages)
Published Online: September 21, 2017
Article history
Received:
August 9, 2017
Revised:
September 6, 2017
Citation
Mao, X., Ding, H., and Chen, L. (September 21, 2017). "Vibration of Flexible Structures Under Nonlinear Boundary Conditions." ASME. J. Appl. Mech. November 2017; 84(11): 111006. https://doi.org/10.1115/1.4037883
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