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论文:2018,Vol:36,Issue(2):388-395 |
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引用本文： |
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陈熠, 崔荣耀, 巨荣博, 豆清波. 考虑机体动力特性的前起落架摆振分析[J]. 西北工业大学学报 |
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Chen Yi, Cui Rongyao, Ju Rongbo, Dou Qingbo. Simulation of Nose Landing Gear Shimmy with Flexible Airframe Considered[J]. Northwestern polytechnical university |
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| 考虑机体动力特性的前起落架摆振分析 |
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| 陈熠1,2, 崔荣耀1,2, 巨荣博1,2, 豆清波1,2 |
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1. 中国飞机强度研究所, 陕西 西安 710065;
2. 结构冲击动力学航空科技重点实验室, 陕西 西安 710065 |
| 摘要: |
| 以某型客机为对象，研究了飞机滑跑时前起落架的摆振稳定性问题。首先建立了考虑机体动力特性的起落架摆振动力学方程组，之后将某型客机参数带入方程组求解得到了该型机前起落架滑跑临界阻尼、临界速度及发生摆振的频率范围。研究结果表明，该机滑跑时出现的摆振失稳问题为减摆器阻尼不够而引起的轮胎型摆振，且该摆振与机体振动模态形成了耦合共振，可以通过增大减摆阻尼避免此问题。同时，还研究了机体结构弹性、轮胎刚度对起落架摆振特性的影响规律。起落架摆振临界速度、最大临界阻尼值及摆振频率随着轮胎扭转及侧向刚度的增大而增大；而机体弹性使飞机起落架的摆振频率更低，且摆振稳定区变小，更易发生摆振现象。因此在研究现代新型大型客机起落架摆振稳定性问题时，不能忽略机体动力特性的影响。 |
| 关键词:
起落架
摆振
动力学
转弯模型
数值仿真
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| Simulation of Nose Landing Gear Shimmy with Flexible Airframe Considered |
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| Chen Yi1,2, Cui Rongyao1,2, Ju Rongbo1,2, Dou Qingbo1,2 |
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1. AVIC Aircraft Strength Research Institute, Xi'an 710065, China;
2. Key Laboratory of Aviation Science and Technology on Structural Impact Dynamics, Xi'an 710065, China |
| Abstract: |
| Shimmy stability of the nose landing gear of an aircraft is studied in this paper. Firstly, Shimmy model was built considering the dynamic characteristics of the airframe. Then the critical damping, critical velocity and frequency range of the shimmy are obtained by introducing relevant parameters into the shimmy model. The research shows that the problem of shimmy is a tire type shimmy caused by insufficient damping of dampers and brings coupled resonance with the vibration mode of the airframe, which can be avoided by increasing the damping of the shimmy. At the same time, the influence of airframe dynamics and tire stiffness on the shimmy characteristics of the landing gear is also studied. With the increase of tire torsion and lateral stiffness, the critical velocity, maximum critical damping value and shimmy frequency of the landing gear increase. However, the elasticity of the airframe makes the frequency of the aircraft landing gear lower and the stable region of the shimmy smaller, so that the phenomenon of shimmy is more likely to occur. Therefore, the influence of airframe dynamic characteristics can not be ignored when studying the shimmy stability of the landing gear of a modern large passenger aircraft. |
| Key words:
landing gear
shimmy
dynamics
turning model
numerical simulation
stability
damping
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| 收稿日期: 2017-06-12
修回日期:
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| DOI: |
| 通讯作者:
Email： |
| 作者简介: 陈熠(1987-),中国飞机强度研究所工程师,主要从事起落架动力学分析与试验研究。
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