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Chin. Phys. B, 2011, Vol. 20(6): 060501    DOI: 10.1088/1674-1056/20/6/060501
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Resonance response of a single-degree-of-freedom nonlinear vibro-impact system to a narrow-band random parametric excitation

Su Min-Bang (苏敏邦), Rong Hai-Wu (戎海武)
Department of Mathematics, Foshan University, Foshan 528000, Guangdong Province, China
Abstract  The resonant response of a single-degree-of-freedom nonlinear vibro-impact oscillator with a one-sided barrier to a narrow-band random parametric excitation is investigated. The narrow-band random excitation used here is a bounded random noise. The analysis is based on a special Zhuravlev transformation, which reduces the system to one without impacts, thereby permitting the applications of random averaging over "fast" variables. The averaged equations are solved exactly and an algebraic equation of the amplitude of the response is obtained for the case without random disorder. The methods of linearization and moment are used to obtain the formula of the mean-square amplitude approximately for the case with random disorder. The effects of damping, detuning, restitution factor, nonlinear intensity, frequency and magnitude of random excitations are analysed. The theoretical analyses are verified by numerical results. Theoretical analyses and numerical simulations show that the peak response amplitudes will reduce at large damping or large nonlinear intensity and will increase with large amplitude or frequency of the random excitations. The phenomenon of stochastic jump is observed, that is, the steady-state response of the system will jump from a trivial solution to a large non-trivial one when the amplitude of the random excitation exceeds some threshold value, or will jump from a large non-trivial solution to a trivial one when the intensity of the random disorder of the random excitation exceeds some threshold value.
Keywords:  nonlinear vibro-impact system      resonance response      random averaging method      stochastic jump  
Received:  12 January 2010      Revised:  11 June 2010      Accepted manuscript online: 
PACS:  05.45.-a (Nonlinear dynamics and chaos)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10772046 and 50978058) and Natural Science Foundation of Guangdong Province of China (Grant No. 102528000010000).

Cite this article: 

Su Min-Bang (苏敏邦), Rong Hai-Wu (戎海武) Resonance response of a single-degree-of-freedom nonlinear vibro-impact system to a narrow-band random parametric excitation 2011 Chin. Phys. B 20 060501

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