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首页> 外文会议>Israel annual conference on aerospace sciences >ANALYTIC AND FINITE ELEMENT ANALYSIS OF AH-1S 'COBRA' TAIL ROTOR DRIVESHAFT SYSTEM IN TERMS OF STATIC LOADS AND NATURAL FREQUENCIES
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ANALYTIC AND FINITE ELEMENT ANALYSIS OF AH-1S 'COBRA' TAIL ROTOR DRIVESHAFT SYSTEM IN TERMS OF STATIC LOADS AND NATURAL FREQUENCIES

机译：AH-1S'COBRA'尾转子驱动系统在静载荷和自然频率方面的分析与有限元分析

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摘要

In the AH-1S “Cobra” helicopter the first natural frequency of the tail rotor driveshaft is very close to the normal operating frequency. The subject of this paper is to evaluate a proposal to replace the original shaft with new ones, with larger external diameter, which will increase the margin of safety between the first natural frequency of the shaft and the nominal operating frequency of the driveshaft system. A dynamic mathematical model of the driveshaft was developed for both the original and the new shaft configurations. The results of these models were compared to FEA (Finite Element Analysis) and test results. The static strength of the shaft supports was also evaluated. Analysis results show that increasing the shaft diameter increases the margin of safety between the first natural frequency of the shaft and the nominal operating frequency from 13% to 33%, while the static load that the bearing supports are subjected to remain almost unchanged.
机译：在AH-1S“COBRA”直升机中，尾转子驱动轴的第一固有频率非常接近正常工作频率。本文的主题是评估一个提议用新的外径更换原始轴，其外径较大，这将增加轴的第一固有频率与驱动轴系统的标称工作频率之间的安全余量。为原始和新轴配置开发了驱动轴的动态数学模型。将这些模型的结果与FEA（有限元分析）进行比较和测试结果。还评估了轴支撑件的静态强度。分析结果表明，增加轴直径增加了轴的第一固有频率与标称工作频率之间的安全余量，从13％到33％，而轴承支撑件的静载荷几乎保持不变。

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