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The main goal of this paper is to analyze the flutter boundary and dynamic load of a supersonic fin. Reduced order mode (ROM) based on Volterra Series is presented to calculate the flutter boundary, and CFD/CSD coupling is used to compute the transient aerodynamic load. The Volterra-based ROM is obtained using the derivative of unsteady aerodynamic step-response, and the infinite plate spline is used...
A simple and efficient mesh deformation method is proposed for time-based nonlinear aeroelastic simulation via CFD/CSD coupling in this paper. With concerned characteristic of multi-structured block, the part of multi-block deformation is studied. A grid deformation technology is developed to fit for the calculation of complex aircraft configuration structure response to nonlinear aeroelastic. The...
Vibration has serious effects on working condition of hydraulic gate. The vibration characteristics, such as natural frequencies, modal damping and modal shape, of a plane gate with violent vibration in the outlet of inverted siphon are obtained by experiment and analysis with hammer excitation method. The results show that the distribution of natural frequencies of the hydraulic gate in a wide range...
Nonlinear aeroelasticity, caused by the interaction between transonic nonlinear fluid and geometrically nonlinear structure, is studied by coupling solution of the two fields. A predictor-corrector procedure with an approximately energy conservation is developed to obtain nonlinear structure response. Finite volume method with dual-time implicit technology is utilized to solve Reynolds averaged Navier-Stokes...
The main goal of present paper is to construct an efficient reduced order model (ROM) for unsteady aerodynamic force modeling. Balanced Truncation (BT) is presented to address the problem. For conventional BT method, it is necessary to compute exact controllability and observability grammians. Although it is relatively straightforward to compute these matrices in a control setting where the system...
Computational structural dynamics (CSD) and Computational fluid dynamics (CFD) referring to aeroelasticity are highly nonlinear problems in time domain. Euler equation is solved by finite volume method with dual-time technology to obtain nonlinear unsteady aerodynamic load; the finite element co-rotational theory is applied to model geometric nonlinear structure, and an approximate energy conservation...
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