Generation of vibration load spectrum for fatigue analysis of equipment mounted on bogie frame of railway vehicle based on fatigue damage spectrum

Abstract

The equipment mounted on the bogie frame of railway vehicles is subjected to non-stationary vibrations from the bogie frame. Currently, the vibration load spectrum for fatigue analysis of equipment is expressed with the power spectral density, which is generally obtained with the power values of measured vibrations or stationary Gaussian vibrations collected at the specific operating conditions. However, this does not have the equivalent damage potential as the non-stationary vibrations. Thus, a generation method of the vibration load spectrum is proposed based on the fatigue damage spectrum (FDS) to obtain the equivalent damage potential as the one from the non-stationary vibrations in this paper. That is, the FDS of non-stationary vibration is calculated with the time domain method, and the vibration load spectrum is generated in the frequency domain with this FDS. Then the method is verified by the measured vibration and dynamic strain of equipment. Finally, the vibration load spectrum of equipment mounted on the bogie frame is generated with the measured vibrations in a maintenance cycle and the fatigue analysis is performed. The results show that the generated vibration load spectrum can validly contain the high power in non-stationary vibrations and express the distribution of power over frequency, which gives much better estimates of the fatigue damage of equipment than other load spectra. The generated vibration load spectrum is suitable for quantifying the actual non-stationary vibrations and can be used for the anti-fatigue design of equipment.

Establishment and Analysis of Load Spectrum for Bogie Frame of High-Speed Train at 400 km/h Speed Level

“…Ji et al [13] proposed a new calibration method to establish a damage consistency load spectrum for a high-speed EMU bogie frame and verified that it had a higher fatigue evaluation accuracy compared with the current international standards. Wang et al [14] proposed a vibration load spectrum establishment method based on the fatigue damage spectrum (FDS). Based on the vibration measured within a maintenance period of the bogie frame, the time domain method was used to obtain the unsteady vibration FDS, and the FDS was used to generate the vibration load spectrum of the bogie frame in the frequency domain.…”

Programmed system for fatigue life prediction of excavator turntables based on multi-body dynamics and finite element analysis

“…The load spectrum is crucial for assessing fatigue value; however, obtaining an actual load spectrum is complex and costly [ [12] , [13] , [14] ].Consequently, many companies lack essential load data, complicating predictions of product fatigue life during design [ 15 , 16 ].Carpinteri et al [ 16 ]studied multiaxial fatigue under varied amplitude and random loading. Wang et al [ 17 , 18 ] estimated the RCF lifespan of wind turbine carburized gears using a multiaxial fatigue criterion, while Zhu et al [ 19 ]assessed the critical surface criteria of four materials under various loading conditions.Gassne initially proposed the load spectrum concept, which remained undeveloped [ 20 ].…”