A frequency conversion measurement method is introduces,and the hardware and software of the system are outlined.

The method of frequency conversion measurement can shun the interference of 50 Hz by adjusting the frequency of the measuring power.

On the basis of analysis and comparation of conventional and some morden dielectric loss measurementmethods, considering the interference of strong electric field of the power grid in local measurement, a frequency conversion measurement method of dielectric loss is presented.

The text told about a fatigue testing system of gears in drive-axle assembly of automobile which referred to vector control and DC-bus, and which referred to the drive-axle lubricating oil temperature computer controlling system.

Based on the analysis of conventional and modern dielectric loss measurement methods,the variable frequency measurement of dielectric loss is an effective method to suppress the interference of strong electric field of power grid on site.

In teaching,in order to train and cultivate the students mathematical thinking and enhance their all-round qualities and abilities,we need to introduce the background of its appearance,analyze the features of quantity change and inner relationship,probe into the law of the unity of opposites,such as quantity change and quality change in changing process,approximate and accurate,and so on.

Based on the engineering fuzzy sets theory and the variable fuzzy sets theory,according to the definition of opposite fuzzy sets and relative difference functions,the quantity change and quality change criterion models of variable fuzzy sets are proposed,and the variable fuzzy sets theory is established systematically,which is the development for static fuzzy sets of Zadeh.