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一、前言铁路车辆的纵向振动大致可以分为两种:1)牵引力或制动力发生变化而引起的纵向振动;2)线路的垂直偏差或轮轴质量分布不均衡引起的纵向振动。近几年来,属于后一方面的问题比较多。本文探讨由轮轴质量分布不均衡(以下简称轮轴不均衡)引起的纵向振动和弯曲振动。二、轮轴不均衡引起的纵向振动的特征由于轮轴不均衡引起的车体纵向振动首次成为问题的711系电车的车体振动加速度波形如图1所示。纵向振动加速度表现为8赫的连续正弦波,所以很容易判明不是因为线路偏差造成的。
I. INTRODUCTION Longitudinal vibration of railway vehicles can be divided into two types: 1) longitudinal vibration caused by changes in traction or braking force; 2) longitudinal vibration caused by vertical deviation of line or imbalance of axle mass distribution. In recent years, there are more problems belonging to the latter area. This article explores longitudinal and flexural vibrations caused by unbalanced wheel hub mass distribution (hereinafter referred to as unbalanced axles). Second, the vertical axis of the imbalance caused by the characteristics of the vertical axis of the vehicle due to imbalance caused by longitudinal vibration for the first time became a problem 711 Department of the car body vibration acceleration waveform shown in Figure 1. Vertical vibration acceleration performance of 8 Hz continuous sine wave, so it is easy to determine not because of line deviation caused.