A practical approach for evaluating safe fatigue life of hydraulic actuator in helicopter based on a nominal force concept and minimal datasets
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- 作者：Z.Y. Lv ; J.J. Xiong ; jjxiong@buaa.edu.cn ; L. Tong ; Y.T. Zhu
- 关键词：Fatigue ; Structural fatigue characteristics ; Safe life ; Step constant amplitude loading ; Hydraulic actuator
- 刊名：Aerospace Science and Technology
- 出版年：2017
- 出版时间：March 2017
- 年：2017
- 卷：62
- 期：Complete
- 页码：158-164
- 全文大小：1698 K
- 卷排序：62
文摘
A practical approach was developed to evaluate fatigue lives of hydraulic actuators in helicopter. The approach is informed by the paucity of experimental dataset for structural fatigue characteristics of hydraulic actuator. On the basis of available fatigue design knowledge, the structural fatigue characteristics of hydraulic actuator was depicted based on a nominal force concept from the paucity of experimental dataset, and safe fatigue life of hydraulic actuator subjected to actual random spectrum load history was modelled based on a reliability concept. Fatigue tests were conducted on three hydraulic actuators subjected to step constant amplitude loading. Finally, the concepts were applied to experimental data, demonstrating the practical and effective use of the proposed method.