Noise problem in swash plate type axial piston pumps is well known in the fluid power industry and several approaches have been reported in the past regarding reducing the noise sources in the pump. In this work two such approaches, namely, relief grooves and precompression filter volume have been investigated in detail. As a result of the investigation, a computer based optimization procedure has been developed to assist pump designers to optimize the rotating group design, especially the valve plate, that will achieve reduction in both fluid borne and structure borne sources of noise in a wide range of operating condition thereby providing quieter operating of the pump. The developed optimization procedure simultaneously considers both compression and expansion regions while optimizing valve plate design. The optimization procedure has been proven using a case study and noise level measurements. Also, a combination technique that includes relief grooves and precompression filter volume attached with relief grooves has also been proposed and the combination technique promises to have the quietest possible operation of the pump in a wide operating range.
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