variation of function meaning in Chinese

函数的变化量

Currently most domestic break - test - plateform adopt the liquid - pressure - servo technique , which possesses the advantages of higher frequency - response and higher controlling exactness , but in the same time , the disadvantages of higher cost , variation of function with the change of oil viscousness produced by the fluctuation of temperature . moreover , the liquid - pressure system is sensitive to the pollution of oil , so it is necessary to take protective and filtrating steps
目前，国内的制动器试验台大多采用的是液压伺服控制，这种控制具有响应频率高、控制精度高等优点，主要缺点是系统成本高、油液粘度随温度变化引起工作性能的变化、且液压系统对油液的污染比较敏感，必须要有良好的保护和过滤措施。