Experimental Evaluation for Fluidborne Noise Attenuation in Tuning Cables and Hoses of Automotive Power Steering Hydraulic Systems

A tuning cable and hose device, i.e. a flexible metal tuning cable placed coaxially inside a section of hose, is usually used in power steering hydraulic circuits to reduce pressure pulsations in the circuits. To evaluate the fluidborne noise attenuation characteristics of tuning cable and hose devices correctly, a new evaluation method, based on the experimental determination of transmission loss of the tuning cables and hoses, is proposed here. The effectiveness of the method and test system are confirmed. The results obtained are valuable for design optimization and theoretical modeling of hydraulic power steering systems and other similar hydraulic systems.