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Vol. 118, Issue 7, July 2010, pp.46-58




Evaluation of the Pressure in the Sacrum of a Person on an Automobile Seat Exposed to a Sinusoidal Vibration with ZigBee Network


Alexandre BALBINOT and Leonardo MORO

Instrumentation Laboratory (IEE), Department of Electrical Engineering (DELET)

Universidade Federal do Rio Grande do Sul (UFRGS) – 90035-190, Brazil

Tel.: 51-3308 4440

E-mail: alexandre.balbinot@ufrgs.br, bifbal@uol.com.br



Received: 10 June 2010   /Accepted: 24 July 2010   /Published: 31 July 2010


Abstract: The study of occupational vibration and its effects mainly on human beings for a long time has aroused interest in the scientific community. To contribute to this area, an experimental apparatus integrated to a ZigBee network was developed to measure the pressure in the sacrum of a person placed in a vehicular seat with the arms clasping legs, exposed to sinusoidal vibration generated by a vibrating platform. The carried out tests, allowed evaluating the pressure in the person’s sacrum for an angle between the seat and the backrest seat of 90º and 120º, with sinusoidal vibrations of 8 Hz and 1 2 Hz with continuous exposure of 4 and 8 minutes. The seat vibration was also monitored. The system allows distinguishing human vibrations of almost 400 Hz in three axes with acceleration of almost 50 g. The experiment’s analysis indicated there is a significant difference between the exposure in the seat and in the backrest. Significant differences to the frequencies, exposure time, and angle between the seat and the backrest were found. It means that in these variables the pressure change was significant.


Keywords: Pressure distribution, Whole-body vibration, ZigBee network


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