Analysis of Co-Relation Between Objective Measurement and Subjective Assessment for Dynamic Comfort of Vehicles
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ght © 2020 KSAE/ 11821 pISSN 12299138/ eISSN 19763832
ANALYSIS OF CO-RELATION BETWEEN OBJECTIVE MEASUREMENT AND SUBJECTIVE ASSESSMENT FOR DYNAMIC COMFORT OF VEHICLES Di Ao1, 2), Pak Kin Wong1)*, Wei Huang3), Xing Tai Mei4), Yu Cong Cao4) and Jing Zhao1) Department of Electromechanical Engineering, University of Macau, Taipa 999078, Macau Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, South China University of Technology, Guangzhou, Guangdong 510006 China 3) School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108, China 4) Department of Vehicle Integration, Guangzhou Automobile Group Co., LTD Automotive Engineering Institute, No. 668 Jinshan Road East, Panyu District, Guangzhou 510640, China 1)
2)
(Received 28 May 2019; Revised 4 December 2019; Accepted 27 January 2020) ABSTRACTThe assessment of vehicle dynamic comfort to human body vibration varies from person to person. Even though the dynamic comfort rating can be obtained by placing measurement devices over the cabin, passengers may have dissimilar sensations. For many car manufacturers, both subject and objective measurements are used together at development of new cars. To effectively assess the dynamic comfort of vehicle, this research explores the correlation between the objective measurement of the whole body vibration, hand-transmitted vibration and subjective assessment. The whole body vibration is measured from the backrest, seat surface and vehicle floor, whereas the hand-transmitted vibration is measured from the steering wheel. Four different vehicles are driven at various speeds on five types of pavements. Both simple linear regression and polynomial regression models based on Stevens’s power law from psychophysics are built to correlate the subjective and objective data. The regression results show that (1) the seat surface is more reliable than other positions for assessing the human body vibration; (2) the hand transmitted vibration on rough roads is more trustful for dynamic comfort evaluation than on smooth roads; (3) the overall dynamic comfort value is the most reliable index for dynamic comfort evaluation. KEY WORDS : Dynamic comfort of vehicle, Correlation analysis, Simple linear regression, Non-linear polynomial regression
1. INTRODUCTION
discomfort and even motion sickness (Griffin, 2007). To predict the risk of vibration discomfort, the information about the complex and time-varying nature of human to vibration was discussed in (Griffin, 2015). Moreover, the vibration directions, frequencies, conversion, and duration were fully developed for explaining human responses. For a better prediction of vibration discomfort, human sensitivity to vibration was studied in terms of the magnitudes, frequencies, directions, and durations of vibration. However, the correlation between the subjective assessment and the objective measurement has not yet been investigated in these studies. From this point of view, objectively evaluate the subjective ratings of dyna
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