Perturbation effect of noise on overall feeling of discomfort from vertical whole-body vibration in vibro-acoustic environment

The human discomfort from combined noise and vibration has been investigated with a new perspective. concept in perturbation effect adopted to formulate novel predictive model of vibration. A psycho-physics experiment designed identify the which caused by stimulus. involved twelve (12) subjects. Each subject was imposed random order total 42 combinations seven (7) levels (X, 61, 71, 77, 84, 87, 89 dBA) where X is no stimulus, six (6) dose values (V1 = 0.2079, V2 0.3242 V3 0.6388 V4 0.8803 V5 1.4947 V6 1.8624 m/s1.75). Initially, would be reference combination assumed have value 100. assigned for chosen at sound exposure level, LAE 71 dB(A) value, VDV 0.2079 ms−1.75. Then other duration 5 s break between stimuli combination. After each vibration, required state form number relative asked seated relaxed position, holding handphone used it record all response after stimulation. finding suggested that can predicted equation ψv=170.6082avdv0.6662 overall given ψv−n=ψv+ψvε ε