Novel method for operating characteristics test of a hydraulic pump

The traditional testing method of a hydraulic pump requires a large amount of test data from a variety of pump working conditions. The test is usually time-consuming and energy-consuming. And the accurate characteristic curves of the pump were hardly obtained due to a limited amount and discreteness of the test data. In order to simplify the test procedure and improve the test accuracy, a novel method for measuring hydraulic pump operating characteristic based on multi-element nonlinear regression (NLMR) modeling is proposed in this paper. The main idea of this modeling method is establishing a mathematical model to predict the performance parameters of the hydraulic pump, only a small amount of test data is needed. Consequently, the pump operating characteristics in any working conditions are obtained. And the test results of the pump are easily characterized in the graphs, charts, tables and so on. The evaluations of the model are carried out and discussed in this paper. The result shows that the test error of the novel method can be controlled to be about 0.1%. Compared with the traditional test method, the proposed method reduces greatly the test time and the random error of the test data, and improves the efficiency and accuracy of the pump test.