关键词: 泵源流量脉动, 泵源阻抗, 二次源法, 线性衰减技术

Abstract: The secondary source method is a standard method for precisely testing the hydraulic pump impedance and flow ripple. The precision of test elements and conditions is limited strictly, so the method is difficult to be used in industry. It is assumed that the pump source impedance and the pump source flow rate connected in parallel, the secondary source is introduced for testing the tested pump impedance, and then the flow ripple is computed with reasonable formulation. The test principle and process of secondary source method is investigated, and the flow ripple of the piston pump with complicated pipe is obtained by two different pipe impedances and flow ripples under different dynamic operating conditions. The test principle of the secondary source method for piston pump with complicated pipe is given, and the problem on operating the test is provided at the same time. The weighted linear regression technique is introduced to evaluate the source impedance at corresponding tested pump frequency quickly and accurately. The flow ripple under different pump outlet pressure is given, and the test method is proven to be used to test the flow ripple of the piston pump with complicated pipe in large scale of operating conditions.

Key words: Source flow ripple, Secondary source method, Source impedance, Weighted linear regression technique