Papers by Keyword: Subjective Rating

Abstract: This study investigated the influence of slope and floor slipperiness on subjective rating of manual material handling (MMH), and identified the consistence between the subjective rating and objective measurement of floor slipperiness under various physical workloads. The COF measurements under slopes (0 ̊~10 ̊), three different floors and two surface conditions were conducted in this study. Thirty adults were recruited to carry four kinds of loads (0~15 kg) and walk on the slope. A survey was immediately conducted to obtain their rating of perceived exertion and perceived sense of slip while handling the loads. The results showed that the influences of gender, slopes, and loads on subjective ratings were significant statistically. The correlation between subjective rating and objective measurements of slipperiness was significantly high. Furthermore, the results also suggested that the floor materials should be selected to avoid the slip accidents. The limitations of slope and load also should be considered for different gender to prevent the disorders on the slopes for MMH tasks. As a result for obtaining the rating of perceived exertion, it was suggested that the combinations of slope angle and load are 5o and 15 kg for male and 5oand 10 kg for female.

Abstract: This paper presents a method of ergonomic design based on subjective rating for the purpose of modeling cushion surface mapped by body pressure distribution (BPD) test data. A sitting comfort evaluation scale was designed to collect subjective comfort perception. Optimal BPD test data were selected by comparing comfort rating after experiments on a trial seat. A data mapping model was established between point clouds in three dimensional coordinate and BPD test data, which can be recognized and transferred in CAD system. In this context, an ergonomic-aided system was developed in practical application to demonstrate the viability of the method. Two designers tried out the system to design a seat cushion, and compared it with conventional method in Rhino software. Results show that the system is more interactive to designers, which can save time of surface modeling by about 50%.