The Study of Vibrations Generated by the Tracks of Tracked Vehicles,

摘要

The crew members of tracked vehicles are affected adversely by low frequency vibrations transmitted to the vehicle compartment from the vibrations occurring in the track. The noise and vibration level in the crew compartment can cause hearing damage and serious discomfort to the crew members resulting in serious degradation of efficiency. These noise and vibration are caused by the transmission of the vibrations occurring in the track as it leaves the rear road wheel and goes over the idler and engages the sprocket. The chordal action in various parts of the track corresponding to the resonance-type vibrations also contribute to the noise and vibration. These factors, therefore, indicate loss of energy generated by the engine in addition to the discomfort to the crew. This is an analytical study of the vibrations generated by the track of tracked vehicles. A method of analysis is derived from the technique of receptance calculation. By this means, the ratio of displacement at the idler wheel support to a periodic force applied at the rear road wheel, as the track pads strike the road, is calculated. This ratio can be obtained with due ragards to the various physical parameters describing the characteristics of the track configuration and the boundary conditions at the idler wheel support. Analysis of forces acting on the idler wheel support also yields results describing favorable idler wheel configuration, compliance of idler arm, and the size of the track shoe assembly. Combination of these results can be used to predict optimum conditions under which the vibration of a prescribed frequency can be minimized. Actual vehicles operating under various terrain conditions will be used.