Optimisation of Structure Borne Noise and Fluid Borne Noise from Fluid Power Pumps and Motors
2009 (English)In: Proc. of the 11th Scandinavian Fluid Power Conference, 2009Conference paper (Other academic)
Structure borne noise in a machine rises from piston force and bending moments among others. This noise arises directly from the pump shell. In this study, a transfer function methodology is employed for mapping simulated internal pump dynamics, such as piston forces and bending moments, on to structure borne noise. Using these transfer functions, it is possible to predict how, for instance, changed valve plate timing affects simulated piston forces and bending moments and in turn how that will affect audible noise. Hence, it is possible to design an objective function that directly reflects audible noise. The transfer functions are experimentally obtained and are valid for a specific machine shell and to some minor extent the room’s acoustical properties. Also, fluid borne noise is important to consider when designing a quiet machine. Fluid borne noise arises mainly from flow pulsation created inside the machine.
Simulation of the internal pump dynamics, and optimisations, are carried out using a pump model developed in the simulation tool HOPSAN. The design application is a hydraulic machine of bent axis type with seven pistons. The theory outlined and the method proposed in the paper can also be applied to other types of hydraulic machines. The paper shows how both structure borne noise and fluid borne noise can be considered using multi-objective optimisation. The paper shows how different noise reduction features affect the sound pressure level and the flow pulsation. The paper also compare the pump and motor case.
Place, publisher, year, edition, pages
National CategoryEngineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-73977OAI: oai:DiVA.org:liu-73977DiVA: diva2:479578
The 11th Scandinavian Fluid Power Conference, June 2-4, Linköping, Sweden