航空发动机中介轴承的动力学减载设计

王俨剀; 廖明夫; 张家豪

doi:10.13224/j.cnki.jasp.2017.02.030

航空发动机中介轴承的动力学减载设计

doi: 10.13224/j.cnki.jasp.2017.02.030

西北工业大学动力与能源学院,西安 710072；西北工业大学旋转机械与风能装置测控研究所,西安 710072

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出版历程
- 收稿日期: 2016-06-16
- 刊出日期: 2017-02-28

Dynamic load reduction design for intershaft bearing of aircraft engine

摘要

摘要: 通过对3种典型的航空发动机中介轴承各30台份的试车数据统计，得到使中介轴承免受“同步冲击”的原则，即：中介轴承内、外环特征频率同风扇叶片气动激振频率的整倍数接近至2%的范围内的情况为危险区域，禁止发动机在此区域长期工作.继而提出了带中介轴承的转子系统优化迭代的动力学设计方法, 通过调整叶片数目或高、低压转子转速比，直至保证危险区域的范围不超过发动机工作范围（从慢车状态至最大状态）的10%.该方法可使中介轴承免受“同步冲击”，有效地降低轴承滚道上的动载荷，提高中介轴承的疲劳寿命.
- 中介轴承 /
- 叶片通过频率 /
- 特征频率 /
- 同步冲击 /
- 减载设计
Abstract: Based on statistics of 30 test run data of three typical intershaft bearing of aircraft engine, a principle to avoid synchronous impact was acquired. The statistics of test run data shows that it is dangerous area when integer multiple of the frequency of aerodynamic force and fault characteristic frequency of intershaft bearings are close in range of 2%,aircraft engine should not work under this state for long. Afterwards, a optimization iterative dynamics design approach for rotor with intershaft bearings was proposed. Blade number or high/low pressure rotor speeds ratio should be adjusted until the range of the dangerous area less than 10% of aircraft engines running range. The approach can reduce intershaft bearings dynamic load, let it free from synchronous impact, and eventually increase its fatigue life.
- inter-shaft bearing /
- blade passing frequency /
- characteristic frequency /
- synchronous impact /
- load reduction

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参考文献(18)

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