Comparative analysis of the vibrations of a spark-ignition engine with and without supercharger mounted in new motor vehicles

• 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 spark-ignition engines: 1.4BZ 90CV CD and 1.4BZ 120CV CD installed in new Fiat Bravo (model 198, version 54A) motor cars. The latter engine model (120CV) was equipped with a supercharging system. The investigations consisted in comparing engine vibrations measured in spe-cific and representative points. In order to determine the vertical component vibrations, the measurements were per-formed via a mirror. A PSV-400 laser Doppler vibrometer made by Polytec was used to measure vibration velocities. The vibrometric system directly measures two quantities: displacement and velocity. In the investigated case, vibration velocity is the variable which supplies 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 measure-ment results. The latter are presented in the form of comparative diagrams. Moreover, the fast Fourier transform was used to determine the frequency distribution. Prior to that the signal was subjected to conditioning operations using parametric windowing and filtering. Interesting conclusions emerge from the obtained results and on their basis 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; engine vibration; 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: 49--54
• 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] De Silva, C., Vibrations Fundamentals and Practice, CRC Press, NY 2000.
• [2] Giergiel, J., Mechanical vibrations (in Polish), University Scientific-Educational Publishers, Cracow 2000.
• [3] Kaźmierczak, A., Wróbel, R., Detection of injection unit defects in Diesel engine through analysis of vibrations, Journal of Kones, 2007.
• [4] Skalmierski, B., Analytical mechanics and theory of vibrations, Polytechnic Publishing House, Częstochowa 2001.
• [5] Fiat’s technical information materials, www.fiat.com.