Journal of Northeastern University Natural Science ›› 2018, Vol. 39 ›› Issue (9): 1277-1282.DOI: 10.12068/j.issn.1005-3026.2018.09.013

• Mechanical Engineering • Previous Articles     Next Articles

Dynamic Load Identification Based on the Houbolt Method

ZHAO Chun-yu, HUANG Qing-yun, ZHANG Yi-min   

  1. School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, China.
  • Received:2017-05-08 Revised:2017-05-08 Online:2018-09-15 Published:2018-09-12
  • Contact: ZHAO Chun-yu
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Abstract: The formulae of the dynamic response related to the excitation and dynamic parameters for a multiple-degree-of-freedom linear vibration system were deduced by virtue of the Houbolt integration and backward difference methods. Then a new method for load identification of unconditional stability was proposed. Taking a linear elastic cantilever beam as an example, the exciting loads were identified using the simulation results of the single inputs of single frequency and dual frequencies, and the dual inputs of dual frequencies. Compared with the conventional state space method, the relative errors and frequency spectrum of the loads identified by the proposed method were smaller in both time and frequency domains, and there was no frequency increasing. This proposed method has improved identification accuracy and has a good anti-noise performance.

Key words: Houbolt method, vibration system, unconditional stability, load identification, relative error

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