关键词: 曲轴；疲劳试验；变频调速；模糊PID控制

Abstract:

Using oscillating method the endurance bending test of automotive engine was done. Discussing the principles of the method, the tester using the oscillating method was designed. The industrial control computer was used as main controller, the variable frequency speed adjusting technique was adopted, the rotation speed of motor can be changed to adjust the oscillating frequency and the experimental load, the experimental data were sampled by a high precision displacement sensor. The system has the function to memorize the experimental data automatically, to judge the fatigue flaw at the forepart, to stop the rotation of the motor and give an alarm. The method can be used in test of multiplicate crankshaft with different neck sizes.

Key words: crankshaft, fatigue test;variable frequency speed adjusting;fuzzy-PID control