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

• Autorzy: Kaźmierczak A. , Reksa M. , Moczko P. , Wróbel R.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

laser Doppler vibrometry; vehicle body vibrations; vibration velocity; spark-ignition engine

• Wydawca: Faculty of Ocean Engineering and Ship Technology, Gdańsk University of Technology
• Czasopismo: Journal of Polish CIMAC
• Rocznik: 2010
• Tom: Vol. 5, no 3
• Strony: 43--48
• Opis fizyczny: Bibliogr. 5 poz., rys., tab.

Twórcy

autor

Kaźmierczak A.

autor

Reksa M.

autor

Moczko P.

autor

Wróbel R.

• Wroclaw University of Technology Institute of Machine Design and Operation I. Łukaszewicza Street 7/9, 50-371 Wrocław Tel. [phone],

Bibliografia

• [1] AFFIRM Investigators, A comparison of rate control and rhythm control in patients with atrial fibrillation, N. Engl. J. Med., 2002; 347: 1825-1833.
• [2] De Silva, C., Vibrations Fundamentals and Practice, NY, CRC Press 2000.
• [3] Engiel, Z., Protection of the environment against vibrations and noise (in Polish), PWN, War-saw 1993.
• [4] Measurement Solutions: Made Possible by Laser Vibrometry, Polytec LM INFO Special, Issue 1/2003.
• [5] Kaźmierczak, A., Wróbel, R., Vibroacoustic Diagnosis of EGR system, Silniki Spalinowe, 3/2008.