Author(s)

H. Andou, T. Koizumi & N. Tsujiuchi

Abstract

Hydraulic excavators have many different front attachments, and they are operated in various manners. Accordingly, stationary excitation and excessive impact loads are applied to the operator cabin. In recent years, a variety of mounts, including high viscous oil mounts, have been used to reduce the cabin vibration. Many papers have shown the stationary characteristics of the viscous mount has frequency- and amplitude-dependency, but there are few papers to characterize the impact behaviour of the viscous mount. The objective of this paper is to understand the impact behaviour of viscous mounts, which corresponds to impact loads for the actual machine. First, the reaction force and the response acceleration of the viscous mounts installed on the vehicle are measured during a critical drop impact test. Next, the impact test of the mount is performed to identify its impact characteristics. The test is performed with a shock load equivalent to the load applied during the drop impact test for the actual vehicle. The equivalent mass of the cabin is also applied to the mount during this shock load test. The characteristics are estimated from the measured data of the mount force and displacement at the initial impact by the least square method. Then, the response acceleration on the mount is calculated by the estimated characteristics using the impact load measured on the drop impact test for the actual vehicle. Finally, it is found that the identified characteristics are appropriate to correlate the calculated acceleration with the measured acceleration on the vehicle. 1 Introduction Hydraulic excavator is a general-purpose construction machine. Therefore, a large variety of front attachments can be installed, for example, hammer, crusher,

Keywords