Optimum Running System of Crawler-Type Construction Machine : 2nd Report, Effects of the Type of Bogie Mechanism on the Dynamic Behavior in Traveling over a Bump

Abstract

In crawler-type construction machines, flexible suspension system like bogie mechanism type suspension is used for the running equipment particularly to improve the comfortability in riding. However, in the running equipment with bogie mechanism, there are many unclear points in the dynamic behavior and loads due to the complicacy. In this paper, first, a modeling method of crawler-type running equipment with K-type bogie mechanism as a multibody system is shown. By using the model, in traveling on a firm ground with a rectangular bump, a simulation to analyze the dynamic behavior is conducted and the bouncing acceleration and the dynamic suspension loads are calculated. The simulation results are compared with experimental results, and the validity and the applicability of the simulation method is verified. After that, in passing over a bump with several heights, effects of the type of bogie mechanism including K-type bogie on the dynamic behavior of construction machine, such as the bouncing behavior and the dynamic suspension loads are shown and discussed. This kind of simulation could be useful for designing and deciding the optimum running system under given environmental, economic and operational constraints.