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

Abstract

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

Decay Curve Analysis of a Damped Vibration System with Multi-force Perturbations

“…The participants rated their discomfort relative to reference stimuli after exposure to each combination. The findings unveiled a predictive equation for discomfort caused by vibration [2].…”

“…Investigating perturbations and their impact on vibration dynamics and control has garnered substantial attention [1][2][3][4][5]. This study delves into the relationship between perturbations and mechanical failure, aiming to unravel novel insights into this complex interplay.…”

An evaluation method for HMI of deep-sea manned submersible based on human reliability

“…The work of submariners requires alternating day and night, which is physically demanding. Previous studies have pointed out that alternating day and night shifts require full consideration of human adaptability, with night and day shifts needing to be at least 48 h apart when they cross over 41 . The results of this study could provide insights into the development of the submersible field.…”

Influence of Seat Vibration Frequency on Total Annoyance and Interaction Effects Caused by Simultaneous Noise and Seat Vibrations in Commercial Vehicles

“…However, other studies have confirmed that noise can change the perception of vibration. Aladdin et al [25], for example, described a perturbation effect from noise to vibration and, based on this, modeled a prediction equation for the total annoyance of random whole-body vibration under the influence of noise. The authors assumed that from the equivalence point of noise and vibration, the noise has a synergetic effect on the total annoyance and, below that, an antagonistic effect.…”