Estimating system damping from the envelope function of free vibration decay for the hard coating composite structure
SUN wei1, QI Fei2, HAN Qingkai3
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School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, ChinaCorrespondent: SUN Wei, E-mail: weisun@me.neu.edu.cn
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History+
Received
Revised
Published
2012-04-01
2012-07-13
2013-06-25
Issue Date
2013-06-25
Abstract
SUN Wei, E-mail: weisun@me.neu.edu.cn) Abstract：Vibration reduction used hard coating is an important passive vibration control method and identifying the damping of hard coating composite structure is the basis work for the vibration reduction study. Because of the complex damping mechanism of hard coating, there is no a universal and effective method to identify the damping parameters. In the paper, estimating system damping from the envelope function of free vibration decay is studied for the hard coating-thin plate composite structure. Firstly, an experiment is done to illustrate that the hammering test and half-power bandwidth method pick-up are limited for the damping test of the hard coating composite structure. Then, the principle formula of envelope method is derived, the flow of test modal damping ratio of composite structure is proposed and the relative test system is set up. At last, the thin plate coated NiCrAlY hard coating is taken as study object, the damping parameter is tested for the un-coating and coating thin plate structure. The test results show that the proposed method has good repeatability, so the higher accuracy of identifying damping can be ensured. Furthermore, the influences of the pick-up sensor types as well as the exciting force amplitude to damping identification are also discussed.
SUN wei;QI Fei;HAN Qingkai.
Estimating system damping from the envelope function of free vibration decay for the hard coating composite structure[J]. Journal of Vibration and Shock, 2013, 32(12): 50-54
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