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Shock and Vibration
Volume 2016 (2016), Article ID 2784380, 12 pages
Research Article

Reconstruction of Input Excitation Acting on Vibration Isolation System

1College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
2Advanced Engineering and Technologies, Canton, MI 48187, USA

Received 2 April 2016; Revised 31 July 2016; Accepted 10 August 2016

Academic Editor: Lei Zuo

Copyright © 2016 Pan Zhou et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Vibration isolation systems are widely employed in automotive, marine, aerospace, and other engineering fields. Accurate input forces are of great significance for mechanical design, vibration prediction, and structure modification and optimization. One-stage vibration isolation system including engine, vibration isolators, and flexible supporting structure is modeled theoretically in this paper. Input excitation acting on the vibration isolation system is reconstructed using dynamic responses measured on engine and supporting structure under in-suit condition. The reconstructed forces reveal that dynamic responses on rigid body are likely to provide more accurate estimation results. Moreover, in order to improve the accuracy of excitation reconstructed by dynamic responses on flexible supporting structure, auto/cross-power spectral density function is utilized to reduce measurement noise.