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2 Machine Dynamics Problems

2 2006

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Experimental Evaluation of Dynamical Measurements Accuracy Basing on the Length of Breaking Distance of a Motor Car

Lewandowski A., Waluś K., Dudziak M.

Machine Dynamics Problems

2006

Vol. 30, No. 2

96-102

In the article there are shown the results of the experimental verification of dynamical parameters of car movement. The experimental verification was carried out by measurement of accelerations and angular velocity of car bodywork tilting using piezo-gyroscope and acceleration sensors. Besides for each test of intensive breaking there was statically measured the distance traveled by the car. There were carried out the statistical analysis and determined the measurement accuracy of designed appliance.

Evaluation of Influence of Measuring Signal Filtering Method on Accuracy of Vehicle Motion Kinematical Features

Dudziak M., Lewandowski A., Waluś K. J.

Machine Dynamics Problems

2006

Vol. 30, No. 3

98-108

In new solutions of anti-lock systems in cars there can be observed the tendency of increasing of their acting frequency. It causes difficulties in registration of phenomena proceeded between a tire and a roadway using traditional measuring systems of which registration frequencies are too small. Quick development of acceleration's micro-sensors and piezo-gyroscopes creates new measuring possibilities including in its range frequencies generated by ABS appliances. Together with measurements frequency increasing there follows increasing of registered signals noises, what caused decreasing of their readability. Counteraction of this disadvantageous phenomenon requires using of signal filtration, which increasing readability of obtained accelerations courses does not cause loosing of important information included in this signal. In this article there is described a new measuring appliance based on acceleration microchips and a piezo-gyroscope cooperating with digital recorder and with original software. Here are shown results of road measuring tests of automobile's kinematical features and described influence of digital filters usage on accuracy of vehicle motion parameters.