The filter cooling pump is one source of vibration in the test stand. (Inset) Rubber-metal isolators isolate impacts and vibrations from machines and motors, and improve wearing conditions.
Test Stands for Hydraulic Pumps
Testing takes place on a test stand rated at 350 hp and that operates about 10 days each month. The stand weighs about 10,000 lb and rests on ACE rubber isolators. Kawasaki gets 25% more efficiency out of the new stand than with their old models. Other technical features include 350 hp, 2,000 rpm, 5,500 psi and a flow rate of 110 gpm. With the help of the rubber-metal isolators, emits minimal noise.
To help engineers meet a strict set of testing criteria, Kawasaki tests these hydraulic pumps with an automated control system. First, they adjust the valves, oil routing, and control signals until they reach the desired levels. After assembling and tuning the pump, they conduct a simulation that measures how the hydraulic pump reacts in different situations or environments.
Kawasaki uses a curve for measuring flow versus pressure. For a pump to pass this test, it must stay between a set of tolerances at various flow rates and pressures. If it falls outside, the pumps are flagged as a failure and the operator either has to make a modification, or a technician needs to rebuild the pump.
By nature, the test stands create large amounts of noise and vibration, which can affect both working conditions and test results
“Shock-absorbing isolators came into the picture because we needed a way to isolate the noise these stands give off during testing,” says Jim Hoenle, hydraulics system engineer at systems integrator MFP Automation Engineering, Hudsonville, Mich., who designed and built the test stand.