Human discomfort response to noise combined with vertical vibration

SUMMARY An experimental investigation was conducted (1 ) to determine the effects of combined environmental noise and vertical vibration upon human subjective discomfort response, (2) to develop a model for the prediction of passenger noise-vibration curves for use as criteria in ride quality design. of subjective discomfort were obtained from a total of 60 subjects who were exposed to parametric combinations of noise and vibrations through the use of a realistic laboratory simulator. Results of this investigation indicated that accurate prediction of passenger ride comfort requires knowledge of both the level and frequency content of the noise and vibration components of a ride environment as well as knowledge of the interactive effects of combined noise and vibration. A design tool in the form of an empirical model of passenger discomfort response to combined noise and vertical vibration was developed and illustrated by several computational examples. Finally, a set of noise- vibration criteria (constant discomfort) curves were generated to illustrate the fundamental design trade-off possible between passenger discomfort and the noise-vibration levels that produce the discomfort. dismzfort

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