The Structure Design Of Rotor Model Basing On Magneto-rheological Damper And Analysis Of Dynamic Stability

Stability of the coupled rotor-body system has long been one of basic topics of helicopter dynamics. To improve the stability of the coupled rotor-body system, one common method is to install dampers at the roots of blades. However, commonly used dampers can hardly meet different demands when helicopter working in different conditions. Therefore, in this thesis, the magneto-rheological damper (MRFD) was studied which is of simple structure, high reliability and self adaption.First, some main structures of the MRFD as well as the rheological quality of the magneto-rheological fluid were introduced; some common experiment methods were introduced. Second, the squeeze and compression mode combination of rotating MRFD and hub were designed. After that, the mechanical characteristics of MRFD was tested. Third, with the test data, we get the parameters of MRFD's force model by using the PolynomialsLater on, the non-linear dynamic model of the coupled rotor-body system with the MRFD was constructed ,and the model is time-domain simulation .The result of which says that the MRFD can meet different needs of helicopter for shimmy damper on the different conditons and improve the dynamic stability of the system markedly.