{"title":"直升机“地面共振”的一致性及旋翼系统的不稳定横扭振动","authors":"Xin Qian, Yu Fan, Lin Li, Wenjun Wang","doi":"10.1115/imece2021-70169","DOIUrl":null,"url":null,"abstract":"\n Ground resonance is a specific unstable vibration caused by the modal coupling between the blades and fuselage of a helicopter structural system. On the other hand, the unstable vibration in a standard rotor model can also be triggered by lateral-torsional coupling. This paper studies the consistency of instability mechanisms between the ground resonance and the lateral-torsional coupling vibration. Based on the two-dimensional equivalent model of helicopter system, the critical elements leading to the ground resonance are firstly studied by modal analysis. Comparison between the ground resonance and the lateral-torsional coupling vibration is then performed in two aspects: critical elements causing instability in dynamic matrices and modal shapes in the modal coupling ranges. Results demonstrate that the instability mechanism of the ground resonance is consistent with which of the lateral-torsional coupling vibration. The reason why similar instability does not occur in the general rotor system with elastic supports is also clarified.","PeriodicalId":23585,"journal":{"name":"Volume 7A: Dynamics, Vibration, and Control","volume":"1 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"The Consistency of Helicopter ‘Ground Resonance’ and the Unstable Lateral-Torsional Vibration in Standard Rotor Systems\",\"authors\":\"Xin Qian, Yu Fan, Lin Li, Wenjun Wang\",\"doi\":\"10.1115/imece2021-70169\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"\\n Ground resonance is a specific unstable vibration caused by the modal coupling between the blades and fuselage of a helicopter structural system. On the other hand, the unstable vibration in a standard rotor model can also be triggered by lateral-torsional coupling. This paper studies the consistency of instability mechanisms between the ground resonance and the lateral-torsional coupling vibration. Based on the two-dimensional equivalent model of helicopter system, the critical elements leading to the ground resonance are firstly studied by modal analysis. Comparison between the ground resonance and the lateral-torsional coupling vibration is then performed in two aspects: critical elements causing instability in dynamic matrices and modal shapes in the modal coupling ranges. Results demonstrate that the instability mechanism of the ground resonance is consistent with which of the lateral-torsional coupling vibration. The reason why similar instability does not occur in the general rotor system with elastic supports is also clarified.\",\"PeriodicalId\":23585,\"journal\":{\"name\":\"Volume 7A: Dynamics, Vibration, and Control\",\"volume\":\"1 1\",\"pages\":\"\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2021-11-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Volume 7A: Dynamics, Vibration, and Control\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1115/imece2021-70169\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Volume 7A: Dynamics, Vibration, and Control","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1115/imece2021-70169","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
The Consistency of Helicopter ‘Ground Resonance’ and the Unstable Lateral-Torsional Vibration in Standard Rotor Systems
Ground resonance is a specific unstable vibration caused by the modal coupling between the blades and fuselage of a helicopter structural system. On the other hand, the unstable vibration in a standard rotor model can also be triggered by lateral-torsional coupling. This paper studies the consistency of instability mechanisms between the ground resonance and the lateral-torsional coupling vibration. Based on the two-dimensional equivalent model of helicopter system, the critical elements leading to the ground resonance are firstly studied by modal analysis. Comparison between the ground resonance and the lateral-torsional coupling vibration is then performed in two aspects: critical elements causing instability in dynamic matrices and modal shapes in the modal coupling ranges. Results demonstrate that the instability mechanism of the ground resonance is consistent with which of the lateral-torsional coupling vibration. The reason why similar instability does not occur in the general rotor system with elastic supports is also clarified.