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Selection of Substitute Loadings for Service-Life Investigations of Vehicle Drivetrains
Technical Paper
785119
Sector:
Language:
German
Abstract
Laboratory testing of vehicle components is less expensive than
driving trials, but correlation of results to actual driving
characteristics demands a great amount of back-up data. Such data
is not available for new designs. One test-stand approach is to
subject components to block loadings or loadings equivalent to
actual operational ones. Ease of adapting these methods to
different drivetrain components is discussed. Apparatus suitable
for measuring dynamic characteristics of drivetrains during actual
street testing is described; the results allow evaluation of
test-stand correlation functions.
It was concluded that block programs based on operational load
distributions provide valid test-stand correlations of
service-life. Statistical evaluations of engine speed distributions
must also be taken into account. The relationship between loading
torque and engine speed can be determined by regression analysis of
test results, although adequate results can also be based on
constant performance operation. New measurement apparatus provides
faster programming of component correlations to test data.