• ISSN 0258-2724
  • CN 51-1277/U
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Volume 25 Issue 6
Dec.  2012
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Journal of Southwest Jiaotong University  > 2012  >  25(6): 968-973.
ZHU Tao, XIAO Shoune, YANG Guangwu. A New Time-Domain Method for Force Identification[J]. Journal of Southwest Jiaotong University, 2012, 25(6): 968-973. doi: 10.3969/j.issn.0258-2724.2012.06.010
Citation: ZHU Tao, XIAO Shoune, YANG Guangwu. A New Time-Domain Method for Force Identification[J]. Journal of Southwest Jiaotong University, 2012, 25(6): 968-973. doi: 10.3969/j.issn.0258-2724.2012.06.010
shu

A New Time-Domain Method for Force Identification

doi: 10.3969/j.issn.0258-2724.2012.06.010
  • Received Date: 12 Sep 2011
  • Publish Date: 25 Dec 2012
    Abstract
  • In order to identify unknown load accurately and reduce the influence of measurement noise on identification results, a new time-domain method for dynamic load identification was proposed based on dynamic programming and Bellman optimization principle. First, the objective function between measured and identified system responses was established using the state-space formulation and the least square error method. Then, discrete equations of motion based on the system displacement, velocity, and acceleration responses were obtained by Newmark integration method. Finally, the dynamic programming method and Bellman optimization principle were used for minimization of the objective function to estimate the excitation forces, and identification formulations of optimal dynamic load were deduced. In addition, the numerical example was provided to verify the proposed mathematical model. The results show that the proposed method has a strong adaptability in dynamic load identification; under 10% noise disturbance, the error of measured response is always less than 25%.

     

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