Dynamic analysis and structure optimization on trapezoidal wave generator for eliminating the over deviation of the residual wave in shock test measurement. (September 2021)

• Record Type: Journal Article
• Authors: Wen, Jingjing; Yao, Houpu; Wu, Bin; Ji, Ze; Wen, Lihua; Xu, Man; Jin, Yi; Yan, Xunliang
• Is Part Of: Measurement. Volume 182(2021)
• Publication Date: 2021-09
• Subjects: Shock test measurement -- Trapezoidal wave generator -- Over deviation of residual wave -- 1D continuous rod -- Structure optimization; Weights and measures -- Periodicals; Measurement -- Periodicals; Measurement; Weights and measures; Periodicals; 530.8
• DOI: 10.1016/j.measurement.2021.109665
• Languages: English
• ISSNs: 0263-2241

Abstract

Highlights: Over deviation of the residual wave in trapezoidal shock pulse is investigated. The over deviation is diagnosed as the impact between the piston and the end cover. A 1D-continuous rod model is established to describe the impact behavior. Several modifications are proposed to alleviate the over deviation. A new separate-style TWG is designed based on the proposed modifications. Abstract: In this work, a new separate-style trapezoidal wave generator (TWG) is designed to alleviate the over deviation of residual waves in trapezoidal shock waveform generation processes. Firstly, a hypothesis is proposed that this over deviation is caused by the impact between the piston and the end cover of the TWG by analyzing the dynamic behavior of the TWG during shock tests, and, subsequently, verified with finite element simulation. Then, a dynamic model is established to describe the impact behavior between the piston and the end cover based on the 1D continuous rod theory. Several parameters, including the impact velocity, the attached mass, the piston weight, the stiffness of the inner cushion, the piston rod length, and the piston rod diameter, are analyzed to estimate this impact behavior. Lastly, the separate-style TWG is designed by implementing a simple and effective modification on the traditional TWG in accordance with the parameters' analysis.