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Fitting passenger seats on intercity coaches to Turkish population: an ergonomic study

Güner, Cenk
The physical dimensions of a population change in the course of time. On the other hand, the physical dissimilarities among different population are much more significant and remarkable than time-dependent natural evolution process that affects all populations in the world. In this study, passenger seats of intercity coaches that are important industrial products for Turkey in terms of usage frequency and their prevalence were investigated from an ergonomic viewpoint. To achieve this aim, eight seat parts and their equivalent anthropometric variables were specified to gather their measures from four different intercity coaches: These coaches represent the normal and top segment in Turkish intercity coaches market in addition to being imported or not. After that, these seat measures are compared with two anthropometric studies in terms of the sufficient sample size to reflect the anthropometric data related to Turkish population and the inclusion of the specified variables that correspond to these parts. Finally, alternative dimensions were recommended for each seat part to be used in the design process of passenger seats. In conclusion, it was found that dimensions of all seats demonstrated no significant differences among each other in terms of belonging to middle or luxury segment coaches. Only for seat pan widths, all seats had higher values than the hip breadths of both anthropometric studies. Conversely, for other seat parts, the dimensions of almost all seats had lower values. All backrest heights were the lowest among the other parts based on the studies of Hertzberg et al and Kayış. It was observed that although all seats showed approximate values with specified seat parts of the directive of European Commission- 2001/85/EC- generally, all seat brands except Grammer had a lower value than the seat pan width mentioned in this regulation. It was also found