吉林大学学报(工学版) ›› 2016, Vol. 46 ›› Issue (4): 1156-1162.doi: 10.13229/j.cnki.jdxbgxb201604022

• Orginal Article • Previous Articles     Next Articles

Identification of nonlinear stiffness and damping for hard-coating composite structure

SUN Wei, LI Jian, JIA Shi   

  1. School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China
  • Received:2014-12-11 Online:2016-07-20 Published:2016-07-20

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Abstract: Based on the resonance decay response of time domain, a method to identify the nonlinear stiffness and damping was proposed using Hilbert transform. First, the free decay motion equation of the hard-coating composite structure under resonance status was determined and the formulas to identify nonlinear stiffness and damping parameters were derived. A numerical example was used to verify the correctness of the proposed identification algorithm. Then, the procedure of identifying the above parameters was presented. Finally, a titanium plate coated with NiCrAIY + YSZ hard coating was chosen as a study case, the nonlinear stiffness and damping parameters of the composite plate were identified and compared with the results of uncoated plate. It is shown that the hard coating can enhance the nonlinearity and increasing the damping of the structure, thus, improving the effect of vibration reduction.

Key words: mechanics, hard coating, composite structure, nonlinear stiffness and damping, parameter identification, Hilbert transform

CLC Number: 

  • TB535
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