Modeling method of binary airfoil nonlinear flutter time domain model

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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