| Abstrakt: |
Aiming at the problems such as the poor response characteristics of motor loading and insufficient consideration on the stress distribution effects in current test methods for the torsional fatigue strength of torque converter end caps, the mechanical testing simulation (MTS) hydraulic servo system was used to design and set up the torsional fatigue strength test system of the torque converter end cap with high dynamic response. Through the force analysis, the strain measuring points were reasonably selected and arranged on the end cap of the torque converter, and the steady-state acceleration and deceleration loads and the alternating loads were simulated by the two loading methods of the ramp signal and the sinusoidal signal. Multi-condition tests were conducted by changing the loading speed and the amplitude, and the test results were analyzed. The results show that the stress at each measuring point is proportional to the loading amplitude, but the stress induced by the sinusoidal loading is larger than that by the ramp loading when the torque is the same due to the larger loading speed for the former case. When the ramp loading is adopted, the loading speed has little effect on the stress of each measuring point. However, when the sinusoidal loading is utilized, the loading frequency has a greater impact on the stress magnitude at each measuring point. In general, the stress magnitude at each measuring point increases proportionally with the increase of the frequency. [ABSTRACT FROM AUTHOR] |
