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2 2014

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Shock absorber efficiency measurement impact of tyres types and pressure

Kemzūraitė K., Žuraulis V., Więckowski D.

Archiwum Motoryzacji

2014

Vol. 64, nr 2

27--36, 127--136

The paper offers analysis of the effect of different types of tyres and tyre inflation pressure on the measurements of shock-absorber efficiency. Testing was carried out in accordance with the EUSAMA method for testing shock-absorbers' efficiency using test stand "Safeline 400/800". Literature review presents a survey of the most up-to-date studies regarding the topic under consideration in this particular paper. For the purpose of research, heavily used summer tyres and slightly worn winter tyres were selected. The effect of air pressure in tyres (varied in range of [1.6 ... 3.0] bar) on the variation of shock-absorber efficiency has been assessed. The correlation between vibration inducing platform and vertical acceleration of the wheel has been examined. Findings obtained through research are depicted graphically. Results about shock absorbers efficiency variation because of the tyres types and pressure and wheel's replication of the vertical acceleration of the vibrating test plate are summarized and conclusions are drawn at the end.

Investigation of dynamic properties of vehicle in various friction condition simulated with use of skidcar system

Žuraulis V., Kemzūraitė K., Więckowski D.

Archiwum Motoryzacji

2014

Vol. 63, nr 1

89--99, 195--205

In this paper, the friction characteristics of a vehicle equipped with skidcar system are analyzed. Skidcar system with attached additional wheels helps to regulate the adhesion with the road surface. Easy slipping vehicle is a useful device for driving skills improvement, carrying out various vehicle dynamics and control research activities. Important reason of skidcar systems is an ability to set low friction values in dry and good contact road conditions. Regulation of friction characteristics extends the limits of the system operation. In this case, the identification of friction characteristics is important. Vertical load of wheels and critical horizontal forces are measured in each operating mode by changing skidcar system height. Furthermore, IS04138 driving manoeuvre is performed to measure the vehicle accelerations, oscillations and slip parameters for friction evaluation in dynamic state. The performed analysis could be useful for drivers training and for further vehicle stability and control researches upon using skidcar system.