A computer model of an automotive monotube damper is developed based on fundamental principles of mechanics. The model can identify the required damper valve and/or size for the desired performance and hence speed the design process. Also, a parametric study can be easily conducted to understand the effects of parameters on the performance. A typical monotube damper is introduced and numerical formulations are described. Satisfactory agreement is achieved between model results and test data for a wide range of parameters including stroke conditions, valve combinations, and gas charge pressure. Some of these results are presented including the correlation at low and high speed strokes, cavitation simulation, and thermal effects on the performance. A mechanics-based numerical model was developed for a monotube damper with a disk valve to predict the hydraulic performance under various stroke conditions without adjustments from test data. Efforts were made to avoid any uncertainties in the model and the discharge coefficients are the only physical constants to be determined by experiments. With these constants defined from test data from a reference damper, good agreement between the model results and test data was achieved for the stroke speed up to +-1 m/s for a wide range of input parameters including valve combination, stroke conditions, and gas charge pressures. Cavitation was incorporated into the model by using a constant pressure condition. Even though more study is required to predict the accurate performance curves under the complex cavitation process, the onset condition of cavitation was successfully predicted by this engineering assumption. Thermal effects on the performance characteristics were also included in the model using temperature-dependent oil properties. The model can be used to perform a parametric study in order to investigate the effects of parameters on performance, to optimize valve components, damper size, and other parameters. The efficient damper model described could also be easily incorporated into a vehicle model to simulate and enhance vehicle dynamic response.
Numerical modelling for the hydraulic performance prediction of automotive monotube dampers
Numerische Modellierung zur Prognose der Hydraulikleistung von Kfz-Einröhren-Stoßdämpfern
Vehicle System Dynamics ; 28 , 1 ; 25-39
1997
15 Seiten, 8 Bilder, 1 Tabelle, 11 Quellen
Article (Journal)
English
Kraftfahrzeug , Fahrzeugfederung , Stoßdämpfer , Software , Auslegung (Dimension) , Stoß (Schlag) , Hydroventil , Gasdruck , Korrelation , Ansprechzeit , Kavitation , Simulationsprogramm , Thermodynamik , Strömungsgeschwindigkeit , Minimierung , Ausschnitt (Öffnung) , Frequenz , Schwingungsdämpfung , Kolbenventil , Differenzialgleichung , Verlagerung , Erwärmung , Dissipation , Messergebnis , Fahrdynamik
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