In order to ensure the durability test of the vehicle component reflects service loads actually and the compression load signal is effective, a method of editing the load signal of vehicle components based on short time Fourier transform is proposed. The accumulative power spectral density of the original load signal is obtained by short-time Fourier transform. The accumulative power spectral density is used to identify and extract the damage parts from the original load signal, and a compression load signal is created. Based on the load signal of the engine mount, this method and the damage retention method are applied to edit the load signal. The results show that, the compression load signal based on short-time Fourier transform with a shorter length of time contain almost same damage of the original load signal, and it has similar statistical parameters including mean value, root mean square and kurtosis as well as the amplitude domain of the original load signal. The engine mount bench iteration test is established by using the compression load signal, and the effectiveness of the method is verified.

The load spectrum edition method based on the wavelet transform to the vehicle components accelerated durability test is introduced. The majority of the fatigue damage are identified and extracted from the characteristic frequency bands in the load spectrum using the 12th order Daubechies wavelet. A compression load spectrum can be achieved by the organization of the extracted damage contribution parts. Taking the powertrain mount load spectrum as an example, the wavelet transform-based and damage retention-based edition method is performed to the lengthy load spectrum. The edited results show that the compression load spectrum based on the wavelet transform edition method has the similar statistical parameters including mean value, root mean square and kurtosis as well as the energy to the original load spectrum. The compression loading spectrum is equivalent to the original one. And wavelet transform-based load spectrum edition method can be used in the accelerated durability test research to other vehicle components.

HXN3B机车是大连机车车辆有限公司自主研发的大功率交流传动调车内燃机车。机车为单司机室，外走廊结构，采用底架承载。本文主要介绍了HXN3B交流传动调车机车底架的结构设计，以及静强度计算。