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Shock and Vibration
Volume 2017, Article ID 3164294, 12 pages
https://doi.org/10.1155/2017/3164294
Research Article

Dropping Shock Characteristics of the Suspension Cushioning System with Critical Components

1Department of Packaging Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China
2Jiangsu Province Key Laboratory of Advanced Food Manufacturing Equipment and Technology, Wuxi, Jiangsu 214122, China

Correspondence should be addressed to Anjun Chen; nc.ude.nangnaij@26jac

Received 22 July 2017; Accepted 29 August 2017; Published 13 November 2017

Academic Editor: Hugo Rodrigues

Copyright © 2017 Hui Li 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.

Abstract

Dimensionless dropping shock dynamic equations of suspension nonlinear packaging system with critical components were obtained. The numerical results of shock response were gained using Runge-Kutta method. To evaluate the dropping shock characteristics of critical components, the dropping damage boundary curve was established, where the system parameter and the dimensionless shock velocity were selected as two coordinate parameters. Then, the frequency ratio and the system damping ratio were taken as third basic parameters of the dropping damage boundary surface, respectively. To study dynamic properties of the suspension system with critical components, the shock response acceleration, shock response displacements, and dropping damage boundary were analyzed. Based on the numerical results, the effects of the relevant parameters on dropping shock response and damage boundary of critical component were investigated. It is demonstrated that both a higher frequency ratio and a system damping ratio in the specific range can exert a positive effect on the product protection and should be selected in design process of the suspension system. Furthermore, with the decrease of suspension angle, the acceleration response peak decreases, the displacement response peak increases, and the safety zone enlarges.