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前言采用功率回收试验方法测试油泵油马达机械效率时,可以不再采用机械的或电器的测扭装置,而将机械效率直接用液压信号表示出来。设备极其简单,精确度很高,这是一种很有发展前途的测试方法。近来,国内有些单位已经试用,但是,由于引入了两个假设条件,缺乏理论根据, 因而对测试结果难以置信。究竟这些假设条件与实际符合不符合,怎样来鉴别,如果不符合,怎样才能排除偶然误差的干扰,又怎样对系统误差进行精确的修正。这些问题须在理论上有所解决,这就是作者写本文的目的。
Preface The use of power recovery test method to test the pump oil motor mechanical efficiency, you can no longer use the mechanical or electrical torque measuring device, and the mechanical efficiency directly expressed by the hydraulic signal. Equipment is extremely simple, high accuracy, this is a promising test method. Recently, some domestic units have been tried out. However, due to the introduction of two assumptions and lack of theoretical basis, the test results are unbelievable. After all, these assumptions do not meet the actual requirements and how to identify them. If not, how to eliminate the interference caused by accidental errors and how to correct the system errors precisely. These problems must be solved in theory, which is the purpose of the author to write this article.