A numerical calculations of fluid flow of a shock absorber valve

• Autorzy: Gniłka J. , Gąsiorek D. , Czop P. , Śliwa P. , Wszołek G.
• Konferencja: International Seminar of Applied Mechanics (14 ; 11-13.06.2010 ; Wisła, Polska)
• Języki publikacji: EN

Abstrakty

EN

Noise concerns in shock absorbers can be divided into two categories. The first is fluid flow noise, or “swish noise”, caused by the oil being forced through openings in the valves. The type and temperature of the oil, its velocity and the orifice geometry all have an effect on this. In addition, the structural design of the shock absorber shell may either reduce or amplify the noise. The second type of shock absorber noise is often described as regular operational noise or “chuckle noise”. It can be observed in vehicles during low-displacement, higher-frequency events, such as driving over a slightly rough road. This effect measurable as a force discontinuity into the vehicle and can come from a number of sources in the shock absorber, e.g. hydraulic transitions. It is often traceable to the valve discs closing and opening, but can also be caused by cavitation/aeration in the oil and air being pulled through the valves. The work on noise improvement reported in this paper has been started using conventional shock absorbers to be extended and will cover in the future variable damping shock systems as well. The paper gives an overview about the configurations of a typical valve system including three basic regimes of operation which correspond to the amount of oil flowing through a valve cavity. The aim of this work was to propose a finite element fluid flow model which can be used in order to reduce the velocity of fluid flow through a cavity of a shock absorber valve. High flow velocity can cause high-content frequency vibrations and, in turn, audible noise. The model will be used for initial screening of new valve concepts and on the other hand to improve the currently use ones.

Słowa kluczowe

EN

shock absorber; valve; fluid flow; numerical calculation

PL

amortyzator; zawór; przepływ cieczy; obliczenia numeryczne

• Wydawca: Wydawnictwo Katedry Mechaniki Teoretycznej i Stosowanej
• Czasopismo: Modelling and Optimization of Physical Systems
• Rocznik: 2010
• Tom: z. 9
• Strony: 29--36
• Opis fizyczny: Bibliogr. 6 poz.

Twórcy

autor

Gniłka J.

• Department of Applied Mechanics, Silesian University of Technology

autor

Gąsiorek D.

• Department of Applied Mechanics, Silesian University of Technology

autor

Czop P.

• Tenneco Automotive Eastern Europe Sp. z o.o.

autor

Śliwa P.

• Tenneco Automotive Eastern Europe Sp. z o.o.

autor

Wszołek G.

• Institute of Engineering Processes Automation and Integrated Manufacturing Systems, Silesian University of Technology

Bibliografia

• [1] Johnston D.N., Edge K. A., Brunelli M., 2002, Impedance and stability characteristic of a relief valve. Proc. Instn. Mech. Engrs. Part I. Journal of Systems and Control Engineering, Vol. 216.
• [2] Wylie B. E., Streeter V.L., 1993, Fluid Transient in Systems, Prentice Hall, Upper Saddle River, NJ.
• [3] Dixon J.C.: The Shock Absorber Handbook. Wiley, England, 2007.
• [4] Guzzomi F.G., O’Neill P.L., Tavner A.C.R.: Investigation of Damper Valve Dynamics Using Parametric Numerical Methods. 16th Australasian Fluid Mechanics Conference 2007.
• [5] Czop P., Sławik D., Śliwa P., Wszołek G.: Simplified and advanced models of a valve system used in shock absorbers. Journal of Achievements in Materials and Manufacturing Engineering 2009, s. 173-180.
• [6] Timoshenko S.P., Woinowsky-Krieger S.: Theory of Plates and Shells. McGraw-Hill Kogakusha Ltd., 2nd edition, 1959.