Control surface system nonlinear flutter model modeling method based on multi-body system transfer matrix method
A transfer matrix, multi-body system technology, applied in instrumentation, electrical digital data processing, geometric CAD, etc., can solve problems such as inability to accurately predict the flutter response of nonlinear systems
Active Publication Date: 2020-03-17
YANGZHOU UNIV
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[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, and proposes a nonlinear flutter model modeling method of the rudder surface system based on the multi-body system transfer matrix method, which solves the problem that the linear flutter calculation method cannot accurately predict the nonlinear system The problem of flutter response, realize the fast solution of nonlinear flutter response of rudder system
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[0207] When the incoming flow velocity is 25m / s, the dynamic response of the rudder surface system with a torsional gap of 0.001rad is calculated. The power spectral densities in the bending and torsional directions of the rudder system are obtained as Figure 5 , 6 It can be seen from the figure that the vibration frequency of the rudder surface is mainly at 0.78. The dynamic response of the rudder system in the bending and twisting directions is as follows: Figure 7 , 8 As shown, the displacement of the rudder system with time can be obtained by combining the two figures. Figure 9 , 10 is the two-dimensional phase diagram of the flutter of the rudder system. It can be seen from the figure that the limit cycle oscillation of the rudder surface has occurred, indicating that the rudder surface has fluttered under this condition.
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The invention discloses a control surface system nonlinear flutter model modeling method based on a multi-body system transfer matrix method. The control surface system nonlinear flutter model modeling method comprises the following steps: deriving a bending-torsion coupling beam transfer matrix based on the multi-body system transfer matrix method; establishing a total transfer equation of the system, and solving a circular frequency and a vibration mode; establishing a motion control equation of a control surface system by using a Theodorsen unsteady flow theory; considering gap nonlinearityand friction nonlinearity, establishing a body dynamics equation based on MSTMM, and obtaining a system nonlinear flutter model; and solving the nonlinear flutter model of the system to obtain the vibration time domain response of the control surface system. According to the method, the problem that a linear flutter calculation method cannot accurately predict the flutter response of the nonlinear system is solved, and the nonlinear flutter response of the control surface system is rapidly solved.
Description
technical field [0001] The invention belongs to the technical field of aeroelastic simulation, and in particular relates to a nonlinear flutter model modeling method of a rudder surface system based on a multi-body system transfer matrix method. Background technique [0002] In engineering practice, rudder surface systems such as aircraft tail rudder and submarine rudder wing are used as dynamic structures, and flutter may occur in high-speed flow fields. Flutter refers to the large-scale vibration of an elastic structure in a uniform fluid due to the coupling of flow force, elastic force and inertial force. The occurrence of flutter will cause fatigue loss of the structure, and may even lead to structural failure in a short time. Therefore, it is meaningful to study the flutter response of the rudder surface system. [0003] At the same time, there are often gaps in the actual system connectors, and gap nonlinear motion and hysteresis nonlinearity caused by friction may a...
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IPC IPC(8): G06F30/15G06F119/14
CPCY02T90/00
Inventor 陈东阳顾超杰孙振业曹九发李迺璐朱卫军杨华庄舒青刘锟
Owner YANGZHOU UNIV
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