| 摘要(英) |
For mechanical systems, the primary source that failure occurs is due to the cumulative damage which executed in the operating process. A dynamic reliability model is developed in this thesis to meet the reliability degradation on the process.Mechanical systems usually bear an oscillating load as a result of the unavoidable vibrations and friction. In this situation, some destructive energy accumulates inside the system and leads to the damage generating failure.
The destructive energy accumulation is propotional to the operating time. Therefore, the ratio of operating time to the mean life of system can properly describe the destructive energy accumulation and this ratio can be defined as cumulative damage D. Based on this idea, a model for the strength decay is proposed. When the complex system bears one-peak-distribution loading, assume the system is perfect initially, i.e. the reliability is one, D should be zero. When the system is failure, i.e. the reliability is zero, D should be one. Consequently, the most appropriate parameter to scale D is reliability. Typical definition data of mechanical systems checked with this model satisfying results are conclude.
The next problem is developing the two-level loading model which is considered that the failure modes in both stages are similar to the loading of nonadjustment and the concept of the part fitting. The advantage of this model is that it can represent the two-level loading completely by adding only one parameter and the physical meaning of this model is obvious enough to show the sequence and phenomenon of the system. The fitting results are also satisfied.
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| 參考文獻 |
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