Influencing Factors Evaluation Of Comfort In Commercial Aircraft Cabin

Nowadays with the rapid development of the civil aviation industry,more and more people choose to travel by plane.The passenger flow is estimated to exceed one billion person-times per year.Unlike the typical building indoor environment,cabin environment is special nature of the passengers exposed to a lower humidity and air pressure,more noisy and higher level of carbon dioxide and air pollutants?such as ozone,carbon monoxide,various organic compounds and biological pollutants Formulations?in confined environment.Even some small perturbation in cabin will lead to very serious consequences.In the course of passenger flights,these unfavorable factors are often not alone but after the combination of the role of the passengers,the passengers have negative physiological and psychological effects,including people dizziness,tinnitus,dryness of eyes and fatigue.To eliminate these adverse reactions to passengers and create a more comfortable,quiet and cleaner cabin environment for Chinese passengers,it is necessary to qualitatively and quantitatively analysis the influence degree of each parameter comfort to passengers in the overall environment.In order to guide the design optimized the cabin of the environmental control system and protect the passenger's cabin overall environmental comfort.Based on the simulation experiment platform,the noise environment in the cabin of the real airliner is simulated by the noise records.The air freshness in the cabin of the real passenger is simulated by the CO₂ gas cylinders,and the cabin air conditioning system is simulated in the cabin.And the temperature field of different combinations to create different combinations of environmental conditions,combined with subjective and objective questionnaires and mental task?MT?methods such as the experiment.Considering the clothes of subjects under different clothing thermal resistance in different seasons,thermal comfort zones of the cabin were revised in summer and winter respectively based on the ASHRAE thermal comfort zone for the building environment.Influencing factors influence subjects differently with the weight coefficient to reflect the results.The results showed that the average correction rates of the MT tests were negatively linear to the noise pressure level under the condition that the noise condition is changed when other factors are constants.Similarly,under the CO₂ concentration condition the mean correction rates of MT tests and the concentration of CO₂ were also negative linear relationship.When the noise and CO₂ concentration are background values,the average correction rates of the MT tests were highest in the case of temperature change,the second in the cold condition,and the lowest in the hot condition.Secondly,because of the CO₂concentration in the cabin environment keeps a high level,metabolic rates of passenger are increased,and the thermal sensation will be strengthened,which will make the thermal comfort zone shift to 1.2?in summer and winter.Finally,the weight coefficient of environmental factors is calculated,and the model of the estimation function method is introduced.The weight coefficients of noise,air quality and temperature in summer and winter are 0.228,0.176,0.596 and 0.39,0.133 and0.476 respectively.The influence degree of temperature is the most,the noise is the second and the air quality is the least.