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Modeling method of binary airfoil nonlinear flutter time domain model

A modeling method and nonlinear technology, applied in the direction of geometric CAD, etc., can solve problems such as hydrodynamic elasticity problems of nonlinear systems that cannot be accurately solved

Pending Publication Date: 2020-02-25
YANGZHOU UNIV
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Problems solved by technology

Traditional linear flutter calculation methods cannot accurately solve the hydroelastic problems of nonlinear systems

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  • Modeling method of binary airfoil nonlinear flutter time domain model
  • Modeling method of binary airfoil nonlinear flutter time domain model
  • Modeling method of binary airfoil nonlinear flutter time domain model

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[0089] The present invention will be further described below in conjunction with the accompanying drawings; the following examples are only used to illustrate the technical solutions of the present invention more clearly, but not to limit the protection scope of the present invention.

[0090] A kind of modeling method of binary airfoil nonlinear flutter time domain model of the present invention, see figure 1 shown. Taking an underwater rudder blade as an example, a nonlinear flutter model of a binary airfoil is established based on a system in which a torsion spring is connected to a rudder blade, and the flutter analysis is performed in the time domain. System structure such as figure 2 shown.

[0091] The specific parameters of the system are as follows: the stiffness of the torsion spring is K α =1.23×10 7 N m / rad, the distance from the center of mass to the elastic axis x α =0.2889, the radius of gyration r of the hydrofoil to the rigid center α 2 =0.405, half of...

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Abstract

The invention discloses a modeling method of a two-dimensional airfoil nonlinear flutter time domain model, which comprises the following steps of: simplifying a system by taking the system that a rudder blade is connected with a torsion spring as an object, and deducing a bending-torsion coupling beam transfer matrix based on MSTMM; determining a transfer matrix of each element, assembling the transfer matrixes into a total transfer matrix, and establishing a system overall dynamic model; superposing a rigid center and a mass center in the transfer matrix, and solving the kinetic model to obtain key parameters of a binary flutter model, namely rudder blade pure bending and pure torsion frequencies; taking a cross section of a 3 / 4 blade extension part, and establishing a binary airfoil nonlinear flutter model; solving the two-dimensional airfoil nonlinear flutter model, and solving the time domain response of the two-dimensional airfoil nonlinear flutter model. According to the method,key kinetic parameters, namely pure bending and pure torsion frequencies of the rudder system, required by the binary flutter model are calculated by adopting the MSTMM, a modeling thought of the binary airfoil flutter model considering gap nonlinearity and geometric nonlinearity is provided, and an effective technical approach is provided for nonlinear hydroelasticity research of the rudder system.

Description

technical field [0001] The invention relates to a modeling method, in particular to a modeling method of a binary airfoil nonlinear flutter time-domain model, and belongs to the technical field of nonlinear vibration. Background technique [0002] In engineering practice, ship components such as hydrofoils of hydrofoil boats and rudder wings in submarines are used as dynamic systems. If the structural parameters are not designed properly, high-speed motion in the flow field will cause flutter, resulting in structural damage, or continuous weak vibration The phenomenon induces water noise, reducing the concealment of underwater vehicles. For the hydroelastic research of rudder systems or hydrofoils, most domestic and foreign scholars use binary flutter models, or simplified models such as a single hydrofoil plus a torsion spring for theoretical calculation and analysis. For the calculation of the binary flutter model, the key is how to obtain the calculation parameters of th...

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Application Information

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IPC IPC(8): G06F30/15
Inventor 陈东阳朱卫军顾超杰杨华李迺路孙振业曹久发杨俊伟胡家峰
Owner YANGZHOU UNIV
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