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Reduction of vehicle body vibrations with piezoelectric dampers

Makowski M., Knap L., Grzesikiewicz W.

Zeszyty Naukowe Instytutu Pojazdów / Politechnika Warszawska

2011

z. 5/86

95--102

In this paper an effect of controlling damping force in a vehicle suspension system is discussed. A vehicle suspension system is equipped with controlled piezoelectric dampers (PZD) which allow controlling vehicle body vibration. In that way ride comfort can be improved. Vertical vibration reduction of vehicle body has an influence on comfort by decreasing a value of vertical accelerations in a arbitrary chosen point of a vehicle body. Control of friction in dampers is realized by controlling piezoelectric valve and flows between chambers of the PZD damper.

Praca poświęcona jest badaniu wpływu sterowania tłumikami piezoelektrycznymi na drgania pojazdu. Ograniczenie drgań pionowych pojazdu wpływa na poprawę komfortu jazdy a zmniejszenie wahań nacisku kół na drogę zwiększa bezpieczeństwo ruchu pojazdu. Sterowanie siłą tłumienia odbywa się przy pomocy amortyzatorów sterowanych zaworami piezoelektrycznymi. Zawór piezoelektryczny umożliwia sterowanie charakterystyką tłumika poprzez zmiany oporów przepływu między komorami tłumika hydraulicznego.

Comparative analysis of the body vibrations of new cars with a spark-ignition engine with and without a supercharger

Kaźmierczak A., Reksa M., Moczko P., Wróbel R.

Journal of Polish CIMAC

2010

Vol. 5, no 3

43-48

The paper presents the results of tests carried out on two new cars: a Fiat Bravo (model 198, version 54A) with the 1.4BZ 90CV CD spark-ignition engine and the same Fiat Bravo model with the 1.4BZ 120CV CD spark-ignition en-gine equipped with a supercharging system. The car body vibrations experimentally determined in several specific repeatable points, i.e. behind the front side indicator and behind the passenger handle, were compared. A PSV-400 laser Doppler vibrometer made by Polytec was used to measure vibration velocities. The vibrometer directly measures two quantities: displacement and velocity. In the investigated case, vibration velocity turned out to be the variable supplying better diagnostic information. Vibrations were measured for the car standing on its wheels and for the car jacked up to reduce the influence of the car vibration damping systems on the measurement results. The latter are presented in the form of comparative diagrams. Moreover, the fast Fourier transform was used to determine the fre-quency distribution. Prior to that the signal was subjected to conditioning operations in time domain, such as para-metric windowing and filtering. On the basis of the results the effect of the drive unit on the behaviour of the car body can be assessed for different engine types and rotational speeds. It is shown that the way in which the engine is mounted affects the vibrations of the car.