In order to face the stress due to the traffic, the driver's weariness should be reduced as far as possible. The driver's seat as workplace in the motor-vehicle is of the utmost importance. In order to make an estimation of the seats of different construction, static measurements and vibration tests have been carried out. To simulate vibration conditions such as they happen in a motor-vehicle on a normal road, a work bench has been built which consists of a partial car body fitted on a hydro-pulsator cylinder. This cylinder can produce sinusoidal vibrations and irregular (aleatory) vibrations. The hydro-pulsator system operates in accordance with the principle of the regulation in hydro-electric series. In order to be able to carry out tests from the point of view of work physiology, the subjects have been submitted to vibrations while showing them on a screen traffic situation simulated by light-impluses. The subjects had to react by using the steering-wheel and the pedals just like in a car. The sum of the mechanical and physical loads gives an ergological load corresponding to that which is produced in a real motor-vehicle. Six current seats of different makes have been examined (seats with springs and seats in cellular tissue). The covering material and the exterior shape were the same for the physiological tests. The static tests have shown that the elasticity characteristics are progressive, as well as for the spring seats as for those in cellular tissue. Their characteristics are hardly any different. The vibration tests have shown a resonance marked at approximately the 2 to 3 Hz in the diagramme of the vibrations, but the amplitudes of the vibrations are different. They are less important for the seats in cellular tissue than for the spring seats. During the tests from the point of view of work physiology, a comparative estimation of both seat types has been carried out while basing oneself upon certain criterions such as: the reaction capacity of the driving simulator, the temperature and the humidity at the seat level, the muscular tensions and the cardiac frequency. These tests show that the seat in cellular tissue generates a larger motor agitation. In consequence, the muscular potentialities are more important for the seat in cellular tissue than for the spring seat. The temperature and humidity conditions are more favourable for the spring seats. This important fact is the result as much of the objective measurements as of the subjective estimations of the seats carried out after each test by the subjects. /Author/

  • Authors:
    • Hontaschik, H
  • Publication Date: 1974-12

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Filing Info

  • Accession Number: 00132105
  • Record Type: Publication
  • Source Agency: Highway Safety Research Institute
  • Files: TRIS
  • Created Date: Nov 9 1977 12:00AM