Study On Evaluation Method Of Comfort For Civil Aircraft Cabin Based On Ergonomic Exposure

With the development of technology,society and economy,people propose higher requirements for safety,comfort,economy and environmental conservation on design of aircraft.Nowadays,with the rapid development of civil aviation industry,passengers have higher requirements for comfort in aircraft cabin,which is also a major factor in economic benefits and user experience,and it has become one of the most important factors in terms of cabin design.Previous studies of comfort for aircraft passengers in China mainly focused on physical environment,facilities and so forth,with absence of consideration of ?human factors‘.As a result,quantization and evaluation of passengers‘ comfort has become a promising perspective in terms of ergonomic exposure.This work was supported by ―civil aircraft special scientific research program,China(Grant No.MJ-2015-F-018)‖,the evaluation method of comfort for civil aircraft cabin and comprehensive evaluation system were established in the current study based on ergonomic exposure.Five main results were obtained as follows.(1)A framework for comfort evaluation that includes psychological comfort and physiological comfort was developed based on ergonomic exposure,psychological and physiological mechanisms of passengers.Design factors of passengers‘ comfort,including passengers,environment and activities,were proposed and their relationship were discussed on the basis of the theory of context awareness and the factors of context awareness.Meanwhile,a ?Board-Seat-Ride‘ time-based passengers‘ comfort awareness flow chart was found in terms of the theory of activity and the review of passengers‘ activity manners.(2)As to the research of psychological mechanisms of comfort,?Self-assessment Scale for Psychological Comfort of Passengers(SSPCP)‘ was presented,and was used to analyze the effort of anthropometrial factors,physical and social factors of cabin on passengers‘ psychological comfort,after that multiple linear regression model was used to address the primary purpose of examining the relationships between design factors and overall comfort.A laboratory experiment simulating passengers‘ activities was carried out to investigate the relationship between anthropometrial factors,sitting postures,activities and perceived comfort of body parts using statistical analysis.In conclusion,linear regression models were fit to evaluate the relationship between design factors and perceived comfort of body parts.(3)As to the research of physiological mechanisms of comfort,a field experiment on passengers‘ comfort was carried out to investigate the relationship between anthropometrial factors,sitting postures,seat classes and pressure distribution,then a multiple linear regression prediction model was used to predict the data of pressure distribution.A laboratory experiment was performed to report the sEMG data of Cervical Erector Spinae(CES),Upper Trapezius(UT)and Lumbar Multifidus(LM)of passneger during the flight,which used to investigate the relationship between anthropometrial factors,sitting postures,seats,activities and muscle response.Finally,the GA-BP neural network was used to predict sEMG data of CES,UT and LM.(4)As to the research of evaluation method of comfort,on account of the subjective nature of comfort evaluation,a comprehensive evaluation methodology was developed to assess the passengers‘ comfort level in a quantifiable way and identify design factors impacting passengers‘ comfort,which included evaluation index system,evaluation set and trapezoidal fuzzy number based on psychological/ physiological mechanisms of comfort.Subsequently,the cooperation of the subjective and objective analysis,which included entropy method,factor analysis method and so on,were used to determine the index weight.(5)As to the research of development and verification of the proposed evaluation system,laboratory experiments and statistic analysis,which was divided into two parts of comprehensive comfort evaluation and physiological signal comfort evaluation,were used to verify the proposed system.In addition,technical system and function module were set up,submodule of comprehensive comfort evaluation,which was imput with anthropometrial parameters,activity parameters,aircraft and cabin aircraft and cabin parameters,along with submodule of physiological signal comfort evaluation that included pressure distribution input and sEMG imput were developed by using Matlab-GUI.Above all,in the current study,evaluation method of comfort for civil aircraft cabin was developed and verified,the evaluation system for passengers‘ comfort was established subsequently.For future studies,the utility of these current method and system are to provide reference measures for the optimization of evaluation system and comfort theory,and it will improve the passengers‘ comfort in aircraft cabin to some extent.