Analysis and optimization of cabin noise for one ambulance / 医疗卫生装备

ABSTRACT

Objective To analyze and optimize the noise in the cabin of some type of ambulance to enhance comfort during operation.Methods The cabin noise of some ambulance was tested under typical working conditions with the test points near the ears of the medical personnel and litter and ambulatory casualties so as to analyze noise distribution and spectrum,and the location,frequency and transmission mode of the noise source were determined,then some measures were taken accordingly including optimizing the structural layout of the exhaust pipe to reduce exhaust noise,increasing the airtightness of the front and rear wheel covers to decrease tire noise,strengthening the suspension design to lower mechanical transmission noise and weakening the vibration source excitation and vibration transmission of the ambulance.Results After performance optimization the noise at all the test points in the ambulance cabin met the technical requirement(not higher than 75 dB),and noise reduction was realized effectively with lowering the average value of the noise at all the test points by 2.9 dB.Conclusion The noise reduction measures proposed behaves well in the cabin of some ambulance,and thus enhances the comfort during operation.[Chinese Medical Equipment Journal,2023,44(10):17-22]