Research On The Load Spectrum Distribution
And Structure Optimization Of Locomotive
Traction Seats
Author(s)
W. Wang, M. Wang & Z. Liu
Abstract
As a result of long-time service, cracks started to emerge in traction seats of the
6K locomotive. There is an urgent need for more reliable traction seat structures.
The stress-time history of key points of traction seats was measured under 6K
locomotive operation condition. By methods of mean stress amendment and load
identification, the load spectra for six traction seats were compiled. The statistic
inference and the fitting test were processed on the load spectra, and the Weibull
distribution function and the maximum load were deduced in order to have a
more comprehensive understanding of the load distribution. With the help of
ANSYS code, the optimization structures of traction seats were designed and the
dynamic stress test was carried out. Combined with the S-N curve and Miner
Law, the equivalent stress amplitudes of key points relative to service life were
calculated. The results show that all of the equivalent stress amplitudes are less
than the fatigue limit and the optimization structures meet with the operation
requirement.
Keywords: load spectrum, equivalent stress amplitude, Weibull distribution,
traction seat.
1 Introduction
The traction mechanism, transmitting the locomotive traction force, is one of the
most important parts, ensuring the safety of the locomotive. As a result of long
service under heavy loads, fatigue cracks emerge in traction seats of the 6K
locomotive. The quantity and size of cracks are increasing seriously, which has
caused a security risk to the locomotive in service [1].
Keywords
load spectrum, equivalent stress amplitude, Weibull distribution,traction seat
Related Book
Other papers in this volume
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