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1982 NOISE CONTROL acoustic enclosures airborne noise output airborne noise radiated Aston Aston University attenuation properties backpressure BHRA Draft Report borne and fluidborne cavitation clamps complex CONTROL IN FLUID cylinder driven load flexible hose flow ripple FLUID POWER SYSTEMS fluidborne noise silencer higher frequencies Hydraulic Equipment I.Mech inlet internal gear pumps isolation techniques level of fluidborne line termination lower frequencies LU LU measurements motor N.E.L. BHRA National Engineering Laboratory noise energy noise reduction oil reservoir outlet port overall noise pipe Pipe Clamps Pipework and Hose piston pumps pre-compression pressure ripple propogation pump and valve Pump design Pump Mountings pump or valve pumping elements Quieter Oil Hydraulic reduce Reduction of noise relief valve Seminar on Quieter silencer design silencing grooves sound energy structural transmission structure borne noise tank transfer function transmitted typical power pack typical pump Universities of Aston University of Bath valve mountings valve noise