An Efficient Aerodynamic Trim Method for Rotorcraft
A rotorcraft and trim technology, applied in the direction of instruments, special data processing applications, geometric CAD, etc., can solve the problems that have not yet established an accurate, efficient and universal aerodynamic trim method, and achieve wide applicability and high accuracy , the effect of improving computational efficiency
Active Publication Date: 2020-11-13
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology
It can be seen that for the aerodynamic research of rotorcraft, an accurate, efficient and universal aerodynamic trim method has not yet been established.
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[0038] A kind of high-efficiency aerodynamic trim method applicable to rotorcraft of the present invention is described in further detail below in conjunction with accompanying drawing:
[0039] The present invention combines the traditional trimming method and the rotor CFD method to establish an efficient aerodynamic trimming method applicable to various types of rotorcraft. The trimming process is as follows: figure 1 shown. The basic idea is to follow the iterative solution idea in the traditional trim method, and use the traditional aerodynamic model in the process of solving the Jacobian matrix to improve efficiency; the calculation results of the traditional aerodynamic model after each step of trim are calculated using the rotor CFD results. calibration to ensure accuracy. image 3 A comparison of the trim history of the coaxial rigid rotor between the high-efficiency trim method established by the present invention and the full CFD trim method is given. It can be se...
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The invention provides an efficient aerodynamic trimming method suitable for a rotorcraft. The method comprises the steps of adopting a simple aerodynamic model to calculate a manipulated variable; adopting a rotor-wing CFD method to correct a calculation result of the simple aerodynamic model; finally, obtaining a trimming manipulated variable in accordance with set convergence conditions. Compared with traditional trimming methods, the trimming method has higher accuracy; meanwhile, the calculation amount is reduced by putting the solution of Jacobian matrices in the simple aerodynamic model, and compared with full CFD trimming, the calculation efficiency is improved. During trimming, the calculation accuracy of the aerodynamic force of rotors is mainly determined by the precision of a CFD model, and the simple aerodynamic model mainly determines a change trend of the aerodynamic force with the manipulated variable, so that the rotorcraft is not limited to a typical single-rotor configuration, and the method has wider applicability to various rotorcrafts.
Description
technical field [0001] The invention relates to the technical field of rotorcraft control, in particular to an efficient aerodynamic trim method suitable for rotorcraft. Background technique [0002] With the wide application of rotorcraft, its diversity has increased significantly, and it is no longer limited to typical single-rotor helicopters. In the aerodynamic research of rotorcraft, aerodynamic trim is an accurate and effective method for simulating the aerodynamic characteristics of rotorcraft for aerodynamic research. premise. Taking the coaxial rigid rotor as an example, if the control amount is not trimmed, its unique lift bias state cannot be accurately simulated. Therefore, establishing an accurate and efficient aerodynamic trim method suitable for various types of rotorcraft plays an important supporting role in the research of rotorcraft. [0003] At present, the aerodynamic trimming methods for the rotor mainly include: 1) The traditional aerodynamic model i...
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IPC IPC(8): G06F30/15G06F30/28G06F113/08G06F119/14
CPCG06F30/20G06F2119/06Y02T90/00
Inventor 史勇杰祁浩天徐国华
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS