A known source of noise within the interior of a vehicle is caused by the hydrauhcallyassisted power steering system. Pressure ripples, initiated by the power steering pump, interact with the hydraulic circuit and propagate throughout the power steering system as fluid-borne noise. The most efficient noise reduction technique is still a flexible hose assembly having various installations such as restrictors or flexible tuning cables. Up to now the design and optimization of power steering hoses was mainly done by costly hardware tests. If simulation techniques are used at all, most of these approaches are based on frequency domain simulation models. The presented method of power steering hose design and optimization is based on distributed parameter time domain simulation models. The characteristic behavior of the hose material is implemented into a flexible wall model. The hose materials individual characteristics are identified once on a test rig and stored into a data base. A component library comprising the most basic hose elements is used to create hose assembly models merely based on the geometrical description of the hose assembly. Hose material characteristics are taken from the material data base. During simulation significant design parameters such as tuner cable length and position or restriction dimension and position are automatically modified by a parameter variation algorithm. Using this method, the design engineer can effectively evaluate various design alternatives at early stages in the development process. The new design and optimization method represents a key step in implementing innovative simulation methods that further increase the quality and performance of the vehicle NVH development process. Moreover the hose simulation models can directly be implemented into a detailed power steering simulation model increasing the quality of dynamic system simulation.
A new method for power steering hose assembly design and acoustic optimisation by means of time domain hydraulic line simulation models
Eine neue Methode zum Entwurf von Schläuchen für Lenkhilfen und akustische Optimierung mittels Zeitbereichssimulation hydraulischer Leitungen
2007
16 Seiten, 11 Bilder, 13 Quellen
Aufsatz (Konferenz)
Englisch
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