Comparison of Objective and Subjective Optimization Operations for Driving Comfort 785044
The presumed relationship between driving comfort and vehicular
vibrational levels has not been adequately addressed. Driving
simulators now permit experimental means of evaluating hypothesized
relationships between the two. The paper describes preliminary
results of such a study.
Two numerical methods of evaluating the vehicular vibrational
levels are discussed. The first, the ISO method, analyzes the
vibrational frequency spectra and, by means of a filtering process,
yields partial, effective values which, when multiplied by the
frequency response of the filter, produce total, effective values.
The second method, developed from recent studies, correlates
frequency values which are found to be equally stimulative to human
perception. This treatment leads to calculation of duration times
of toleration of vibrations and subsequent evaluation of loss of
operating ability by drivers. Both of these two methods are then
incorporated into an optimization program which gives two differing
sets of optimum shock absorption characteristics for roadways.
Tests were conducted with drivers in a simulator which requires
driver operation under vibrational loadings. Preferred shock
absorption levels were identified by the subjective reactions of
the participants. Results showed good agreement with those
predicted by the second vibrational evaluation method.
17th FISITA Congress (1978), Budapest, Hungary