Research on the vibration test load spectrum for bogie frame-mounted tractor motor based on on-track tests
Ignoring the effects of high-frequency signals and small-amplitude cycles that contribute little to structural fatigue damage, rainflow counting was performed on the vibration load of traction motors to generate a three-dimensional load spectrum. Based on the Haigh fatigue curve with a stress mean g...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Department of Electric Drive for Locomotives
2023-01-01
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| Series: | 机车电传动 |
| Subjects: | |
| Online Access: | http://edl.csrzic.com/thesisDetails#10.13890/j.issn.1000-128X.2023.01.002 |
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| Summary: | Ignoring the effects of high-frequency signals and small-amplitude cycles that contribute little to structural fatigue damage, rainflow counting was performed on the vibration load of traction motors to generate a three-dimensional load spectrum. Based on the Haigh fatigue curve with a stress mean greater than 0, a mean load correction method was constructed to convert the three-dimensional load spectrum into a two-dimensional load spectrum. The test load spectrum was then extended across the life-cycle running mileage; the maximum load amplitude under the life-cycle running mileage was inferred depending on the consistency in the characteristic parameters of the load spectrum, to confirm the life-cycle load spectrum. Referring to the method defined in FKM, the variable amplitude cycle coefficient was calculated, the calculation method of the equivalent constant amplitude load was determined for the corresponding variable amplitude cycle, and the constant amplitude load spectrum was constructed for the vibration load fatigue test of the frame-mounted traction motor. A finite element model was established, and the fatigue strength at the welded joint between the motor seats and the cover plates of the transom was calculated by using the variable amplitude cycle over the life-cycle running mileage and the equivalent constant amplitude cycle load spectrum as the input respectively. The calculation results show that the weak areas of structural fatigue strength are consistent under the action of variable amplitude cycle and equivalent constant amplitude cyclic loading spectrum, and the maximum material utilizations are 0.277 0 and 0.326 5 at the joints, respectively. The equivalent constant amplitude cyclic loading spectrum established is conservative and can effectively guide the fatigue strength test of the frame. |
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| ISSN: | 1000-128X |