气动阀门颤振的局部稳定与全局稳定特性

陈二锋; 丁建春; 武园浩; 余武江; 崔卫民

doi:10.13224/j.cnki.jasp.2018.03.020

气动阀门颤振的局部稳定与全局稳定特性

doi: 10.13224/j.cnki.jasp.2018.03.020

1.
中国航天科技集团公司北京宇航系统工程研究所,北京 100076
2.
中国航天科技集团公司北京宇航系统工程研究所,北京 100076；西北工业大学航空学院,西安 710072
3.
西北工业大学航空学院,西安 710072

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出版历程
- 收稿日期: 2016-09-26
- 刊出日期: 2018-03-28

Local and global stability of pneumatic valveschatter

摘要

摘要: 基于修正的库仑摩擦力模型,理论分析了气动阀门的非线性稳定特性,提出了阀门颤振的不稳定、局部稳定及全局稳定区域,定性解释了阀门在局部稳定区域颤振的必然性与偶然性；并针对某型号用保险阀,构建了基于AMESim的保险阀系统仿真模型,通过线性及非线性稳定性仿真分析,获得了该保险阀系统的局部稳定、全局稳定特性及库仑摩擦力对稳定性的影响特性,在此基础上,开展了不同摩擦力条件、扰动条件下的保险阀系统非线性稳定特性的试验研究,结果表明:对于非线性阀门系统,在局部稳定区域会存在小扰动稳定、大扰动不稳定的状态,从仿真角度解释了该保险阀系统在通气试验保持稳定而在通气振动试验中却发生明显颤振的现象；同时,库仑摩擦力增加可有效提升保险阀的系统稳定性及抗扰动能力,试验结果验证了保险阀非线性稳定性分析结果的有效性。
- 颤振 /
- 非线性 /
- 局部稳定 /
- 全局稳定 /
- 保险阀
Abstract: Based on a modified Coulomb friction force model, the nonlinear stability characteristics of pneumatic valves' chatter were theoretically analyzed, and the regions of instability, local and global stability were developed, which interpreted the inevitability and occasionality of valve chatter at the local stable region. Taking a safety valve as the research object, the AMESim model of the safety valve system was constructed, the local and global stability regions, and the effect of Coulomb friction were obtained. Moreover, validation of the stability analysis was performed by the pneumatic experiment of the safety valve under various friction forces and various disturbance conditions. Results indicated there was a local stability region of small disturbance stability and large disturbance instability, showing that the safety valve was stable at exhaust experiment and unstable at exhaust and vibration experiment from the view of simulation. Moreover, with the increase of the Coulomb friction force, the stability and anti-disturbance ability of the safety valve system were enhanced, and the validation of nonlinear stability analysis was improved by the exhaust and vibration experiment of the safety valve.
- chatter /
- nonlinear /
- local stability /
- global stability /
- safety valve

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