Journal of Northeastern University Natural Science ›› 2014, Vol. 35 ›› Issue (9): 1296-1299.DOI: 10.12068/j.issn.1005-3026.2014.09.019

• Mechanical Engineering • Previous Articles     Next Articles

Identification Method of Local Dynamic Parameters Based on FEM

TAN Zhen, LI Chaofeng, TAI Xingyu, WEN Bangchun   

  1. School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, China.
  • Received:2013-11-05 Revised:2013-11-05 Online:2014-09-15 Published:2014-04-11
  • Contact: TAN Zhen
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Abstract: Based on the finite element theory, an theory equation which can be adapted to identify parameters of stiffness and damping was derived by harmonic balance method. The equation was solved by in the form of trigonometric function(sine, cosine)and plural respectively. A typical rotor system case was simulated to check the supporting stiffness and damping of subsystems. The results show that both kinds of forms can identify boundary parameter accurately and reliably. But the forms of sine and cosine expansions are so complicated after derivation that it is unfit for identification of the system nonlinear characteristics. The form of plural expansion can simplify the process of calculation and deduction, and it can well identify both the linear solution and nonlinear solution with higher precision. This study can provide theoretical reference for design and vibration analysis of such systems.

Key words: parameter identification, harmonic balance method, finite element, subsystem model, nonlinear

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