Vibration Characteristic Of Human Body And Comfort Evaluation Under Ambient Vibration

Along with the rapid development of economy, the growing of the city scale, andthe raise of requirements for environmental quality, the influence of vibration onpeople’s work, life and health has already become a cannot ignore scientific question.Ambient vibration has been destroying the harmony between human being and nature,which has been recognized as one of the seven typical causes of the environmentproblem internationally. So making a study of human body dynamic response causedby vibration is significant and fully reflects the―human-oriented‖social relationship.The traditional study had been only considering the effects and evaluation onhuman body in vertical vibration, and the horizontal vibration was simple ignored,which caused human dynamic response could not be reflected accurately. This paperis based on the horizontal vibration, by use of the shaking table test of human bodydynamic response, the human dynamic response is analyzed and human dynamicmodel is established, and the method of comfort evaluation is studied.Main contents of the study are as bellows:1. Twenty samples were exposed to White Noise Excitation in X, Y direction instanding, sitting, recumbent position for the shaking table test. The frequencydistribution of body is gained; dynamic response of human body was analyzed bymeans of accelerations and their power spectra; human dynamic models based on thedifferent conditions (in standing、 sitting、 recumbent position) are establishedaccording to the existing standards and the ways about establishing human bodydynamic model.2. Based on MATLAB Optimization Toolbox, according to the principle ofnonlinear least squares method, through data fitting between theoretical andexperimental values of frequency response function, the dynamic parameters ofhuman body(equivalent quality, equivalent stiffness and equivalent damping) areidentified.3. A sensor fixed device used for the human body vibration experiment isdesigned. The device is not only in view of standing, sitting, recumbent position, butalso can collect data in X, Y, Z directions simultaneously at the same position. It hasthe advantages of simple making, easy to use, easily fixed, not easy to causeinterference to vibration signals, so that it is of great signification to extend its range of application.4. The existing comfort evaluation methods of human body are summarized, anda new kind of comfort evaluation model——comfort comprehensive evaluationmethod is proposed. The objective vibration evaluation index and subjective fuzzylanguage are quantified as certain relations, and multiple factors (such as differentvibration intensity, different points) are considered in this method.