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结合实车振动舒适性试验与体压分布试验,研究了汽车行驶动态工况下人椅系统的振动特性与体压分布特性。采用加速度传感器测量了人体头部、背部、臀部及坐椅底板等部位的振动,试验表明人体承受靠背纵向、坐垫垂向的振动较大;通过人椅系统传递特性分析,可知人体头部主要运动发生在XZ平面,且研究人椅系统振动舒适性时,除考虑坐垫振动外,靠背纵向、头部垂向振动不容忽略。采用电容式压力分布传感器Xsensor测量了人椅接触界面靠背、坐垫体压分布,人椅系统静态体压统计分析表明靠背、坐垫分别承载了人体17.67%,67.65%的质量;汽车行驶工况纵向压力中心坐标在持续坐姿下,靠背、坐垫分别向下、向前滑动,动态体压参数随车速的增加而增加,同时与加权加速度均方根值呈良好正相关,表明汽车行驶工况下动态体压参数能够综合反映人椅系统的振动舒适性。
Combining with the real vehicle vibration comfort test and the body pressure distribution test, the vibration characteristics and body pressure distribution characteristics of the human-chair system under the dynamic driving condition are studied. The accelerometer was used to measure the vibration of the human head, back, buttocks and the floor of the chair. The test shows that the human body can bear the longitudinal direction of the backrest and the vertical vibration of the seat cushion is large. By analyzing the transmission characteristics of the human-chair system, it can be seen that the main movement of the human head Occur in the XZ plane, and study the vibration and comfort of the chair system, in addition to considering the cushion vibration, the longitudinal backrest, head vertical vibration can not be ignored. The capacitive pressure distribution sensor Xsensor was used to measure the contact pressure of seat backrest and cushion body. The static body pressure statistic analysis showed that the backrest and seat cushion respectively carry 17.67% and 67.65% of the mass of the human body. The vertical pressure The center coordinates of the vehicle in the continuous sitting position, the backrest and the seat cushion slide downward and forward, respectively. The dynamic body pressure parameters increase with the increase of the vehicle speed, and have a positive correlation with the weighted root mean square acceleration, indicating that the dynamic body The pressure parameters can comprehensively reflect the vibration and comfort of the chair system.