| With the rapid development of science and technology and economy, the modernpeople’s life becomes more and more various, at the same time, the sound environmentgradually become the important factors that affect the human body comfort level.Inrecent years, the studies of sound environment affect human comfort is also becomemore and more.Real life filled with all kinds of sounds, they generally can be dividedinto music, language, and three types of noise, noise is the sound which people don’twant to hear, language and music in different environments will bring different feelingsto the person.In view of the sound environment, related research at home and abroadthat bases on it is carried out at low altitudes, without considering higher elevation orthe impact of atmospheric pressure drop.With the increase of altitude, atmosphericpressure to drop, affect human body comfort evaluation of sound environment, lack ofrelated research and data.People living in plateau area, in the low pressure environment; Travel by plane,the plane when cruising under low pressure environment, general cabin pressurecontrol about0.8atmosphere pressure (folded around altitude2000m). According tomedical knowledge,3000meters above sea level pressure environment is easy to makepeople produce the plateau reaction pathological symptoms, so in this paper, we studythe low pressure range corresponding security zone under3000meters high.Questionnaire experiment mainly through the human body, combining two kinds ofphysiological parameters of blood pressure and heart rate, body sound environmentunder the low pressure comfortableness indexes of related study and theoreticalanalysis.Through the plateau environment under different altitude simulation cabin tosimulate the pressure of the environment, and through the sound source at differentpressure environment simulation of different sound environment experiment, this studyselected sound samples for white noise of65dB and85dB,70dB language and musicclips,with the samples under the sound environment of research on the effects of human body comfort under low pressure.In the experiments, the subjects were scored for each subjective evaluation indexwith the questionnaire method, subjective evaluation indexes including: Sound feeling,the total valuation of sound (TMD), irritability, fatigue, nervousness, health.. Theanalysis found, the subjects of subjective evaluation indexes were reduced withincreasing pressure and variation, tolerance of human body to the low-pressureenvironment noise is decreased under atmospheric pressure. Further analysis of theinfluence of gender on subjective evaluation, found that female subjective evaluation ofnoise is generally better than male, which is the degree of responses to external soundenvironment is light; in addition, blood pressure and heart rate of subjects in theexperimental process were measured, in the different sound environments, the subjectsof heart rate decrease with the pressure increased, blood pressure had no significantvariation.By the theory of Fuzzy Mathematics (AHP-Fuzzy), subjective evaluation indexon the low pressure of each sound environment by the AHP, establish a soundenvironment comprehensive comfort fuzzy evaluation model, and further comparingthe change law of human evaluation under low pressure on the sound environment. |
