Validity of Human Sensitivity of Comfort Reactions According to ISO2631

Cheong, Wan Xiong (2019) Validity of Human Sensitivity of Comfort Reactions According to ISO2631. Final Year Project (Bachelor), Tunku Abdul Rahman University College.

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Abstract

Whole-body vibration occurs during our daily life and normal daily activities. So, it is very important to know the characteristics and the effect of it will bring to our life. As we know, vibration can be good or bad to our human being as it is one phenomenon that very hard to measure and interpret. It is not easy to understand and the human sensitivity of comfort reactions towards vibration environment still needs to be study and discuss. According to ISO2631, the human sensitivity of comfort reactions towards vibration environment in public transport is provided. The comfort level in each total vibration value was stated but the data is overlapping. Besides, it is lack of justification and many studies been done by referring to it without any prove. Vibration analysis needs to be carrying out to understand the whole-body vibration. Hence, the method to measure the whole-body vibration and the experimental validation set up are follow according to ISO2631. The table of human sensitivity of comfort reactions total vibration value need to be refers as the basic data of the experimental validation. A set of vibration analysis been carry out by set-up the apparatus and proving the theory and calculation of Whole-body Vibration measurement according to ISO2631. The vibration analysis will tested on single frequency on single direction to create total vibration value in the range of table 3-1. The experimental validation conducted by invite 30 people to join and answer a questionnaire. At the first three total vibration value according to ISO2631, those 30 people will have their own choice to select the comfort level. In order to obtain first three total vibration value according to ISO2631 table, the experimental validation need is adjusting frequency and master gain every time for each total vibration value for each participant. By obtain the results, we can tally up the result and rearrange a new table for further research and analysis. The results of this experimental validation are most of the participants select their comfort reaction similar to ISO2631standard. For the range of less than 0.315m/s2, 22 participants select their comfort reaction as not uncomfortable, 6 participants select as a little uncomfortable and 2 participant select as fairly uncomfortable. Thus, majority of the participants select their comfort reactions as not uncomfortable which is similar to ISO2631. Besides, for the range of 0.315 m/s2 to 0.63 m/s2, 25 participants select their comfort reaction as a little uncomfortable, 4 participants select as fairly uncomfortable and 1 participant select as uncomfortable. Thus, majority of the participants select their comfort reactions as a little uncomfortable which is similar to ISO2631. Lastly, for the range of 0.5 m/s2 to 1 m/s2, 24 participants select their comfort reaction as fairly uncomfortable, 5 participants select as uncomfortable and 1 participant select as a little uncomfortable. Thus, majority of the participants select their comfort reactions as fairly uncomfortable which is similar to ISO2631. Keywords: ISO2631, vibration analysis, whole-body vibration measurement, validation