A Helicopter Overall Design Method Considering Flying Quality

Abstract

The invention discloses a helicopter overall design method based on the consideration of flying quality, belonging to the technical field of helicopter design. According to the design method, a trajectory optimizing model of helicopter maneuvering flight simulation is built with limitations of mission task elements on the position and attitude of a helicopter as the path constraints of state variables of the helicopter as well as the required time for finishing the mission task elements and the time history integral of manipulating speed as the objective functions; and the required time for finishing the mission task elements is used as the quantitative value index of helicopter flying quality evaluation, and is used as the flying quality constraint to be added into the helicopter overall design framework. With the design method provided by the invention, flying quality can be taken into consideration during overall layout and determination of design parameters at the initial stage of helicopter research to meet the specified requirements; and the method has a wide application range, and the objective functions of the trajectory optimizing model fully embody the internal meaning of flying quality.

Description

technical field [0001] The invention belongs to the technical field of helicopter design, and in particular relates to a helicopter overall design method considering flight quality constraints, which can be used to improve flight quality when the overall layout and design parameters are determined in the initial stage of helicopter development. Background technique [0002] With its unique vertical takeoff and landing and air hovering capabilities, helicopters have been increasingly widely used in the fields of homeland defense and economic construction. Different mission requirements have different requirements on the flight quality of helicopters. For example, armed helicopters have higher requirements for maneuverability when performing air combat and flying close to the ground, while general-purpose helicopters require high mobility when rescuing people and flying with external slings. better stability. Compared with fixed-wing aircraft, the flight quality of helicopter...

AI Technical Summary

Problems solved by technology

However, inverse simulation technology still has the following deficiencies in the application of flight quality assessment: (1) the convergence of the inverse solution algorithm is heavily dependent on the preset flight trajectory, and the unreasonable predetermined trajectory directly leads to the divergence of the solution process; (2) for accurate As far as the quality criteria of the mission subject primitives are concerned, the predetermined trajectory is an index to measure the flight quality, which cannot reflect the influence of the helicopter design parameters on the flight quality; (3) Many mission subject primitives specified in the flight quality specification cannot give specific It is described by mathematics, and the inverse solution method is also difficult to consider the impact of different environmental perception levels on flight quality

In addition, the overall design of the traditional helicopter does not consider the requirements of flight quality. Generally, the evaluation can only be carried out after the prototype is produced. The evaluation obtained is the conclusion of the whole aircraft. It is difficult to find the corresponding relationship with the overall parameters of the helicopter. Cannot be used to guide design in advance

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