Dynamic Characteristic Analysis of Refrigerator-Truck Transport System by Using Inverse Substructure Method

This paper is a continuation of the previous research. The refrigerator-truck system is treated as a two-substructure multi-coordinate coupled system, which is composed of a refrigerator substructure and a truck substructure coupled by numerous packaging units. Applying the two-substructure multi-coordinate coupled inverse substructure method to a product-transport system, the paper makes an analysis of the dynamic characteristics for the refrigerator-truck system. In order to validate the method in the refrigerator-truck system, the measured system-level frequency response functions (FRFs) were used to predict the substructure-level FRFs that were compared with those directly measured and found to be in agreement in trend. To evaluate the vibration transmissibility of packaging units, the concepts of the vibration contribution, vibration contribution ratio, overall vibration contribution and overall vibration contribution ratio to product response through each packaging unit are introduced. The vibration contributions to the refrigerator through four coupling points almost coincide with each other in the whole frequency domain. However, the vibration contribution ratios are different at each frequency. The overall vibration contributions to the refrigerator through the frequency domain 10 to 50 Hz through four coupling points are respectively 9.4, 7.5, 9.8 and 11.2 mm/N, and the overall vibration contribution ratios are respectively 0.25, 0.20, 0.26 and 0.29. The vibration transmissibilities of four coupling points are similar. Copyright © 2014 John Wiley & Sons, Ltd.