Aeroplane buffet air tunnel model integration design and manufacturing method

Abstract

The invention relates to an integrated design and manufacture method of a full resin airplane low-velocity flutter wind tunnel model based on photocuring rapid prototyping. The method first conducts the integrated design of the flutter model according to the actual structure of an airplane, the requirement of a wind tunnel experiment and the parameters of photocuring resin material and based on the photocuring resin material, and makes the full resin flutter model in an integrated way on the basis of the optimization of the photocuring rapid process. The method proposes a new design and manufacture concept of the flutter model of low modulus material, gets rid of unnecessary assembly links by the use of the advantages of accuracy, quickness and low cost of the photocuring rapid prototyping technology, the uniformity of the model material, the low modulus of the resin material and isotropy characteristic, and designs and manufactures the full resin flutter wind tunnel model meeting thefull dynamic similarity. The method overcomes the defects of traditional technologies, improves the manufacture precision of the wind tunnel model, reduces cost, shortens the period and realizes structural similarity, thus boosting the development speed of an airplane.

Description

technical field [0001] The invention belongs to the technical field of rapid prototyping technology and aviation industry wind tunnel experiment model manufacturing, and in particular relates to an integrated design and manufacturing method of an all-resin aircraft flutter wind tunnel model based on photocuring rapid prototyping. Background technique [0002] Aircraft flutter is a self-excited vibration under the action of aerodynamic force, elastic force, and inertial force. It absorbs energy from the air. Once the flight speed pressure exceeds a critical value, the amplitude increases rapidly, resulting in damage to the aircraft structure. Flutter is a destructive vibration, so flutter is not allowed within the flight envelope of the aircraft. In order to ensure that there is no flutter in flight, it is necessary to study and check the flutter performance of the designed structure, and the flutter wind tunnel experiment of the aircraft model is an important means to study ...

AI Technical Summary

Problems solved by technology

The deficiency that this method exists has: (1) complex process

This decentralized design and manufacturing method not only increases the difficulty of design, but also makes the process more complicated

(2) Accuracy is difficult to control

The traditional process adopts the method of separately designing, processing and reassembling parts such as metal beams, dimensional frames, and skins. This multi-component assembly method reduces the overall accuracy of the model; while the processing and overall assembly of dimensional frames, skins, etc. Most of them are based on manual work, resulting in a loss of overall accuracy

This problem is more prominent when the shape and internal structure of the model are complex

(3) can not meet the similar structure

Because the rigidity of the metal material in the rigidity reduction design is too large, it is impossible to take into account the consistency of the structure under the premise of similar rigidity, and the dimensional frame and skin do not contribute to the rigidity of the model, which is not consistent with the actual situation of the aircraft, so , traditional design and manufacturing methods cannot meet the requirements of similar structures

(4) High cost and long cycle

[0006] To sum up, there are relatively mature research results at home and abroad in the use of light-cured rapid prototyping technology to manufacture force and pressure measurement models; in terms of flutter models, the current focus is on the manufacture of aircraft shells, which partially overcomes the shortcomings of traditional processes , but because it is not an integrated design and manufacture, it does not give full play to the advantages of light-curing rapid prototyping technology

On the other hand, although research has been carried out on the design and manufacture of all-non-metallic models, due to the anisotropy of fiber-reinforced composite materials, there is a conflict with the isotropy of actual aircraft materials, which affects similar quality; at the same time, based on The manual composite material forming process has the disadvantages of long cycle, complicated process and low forming precision, and has not completely got rid of the limitations of traditional processes.

Therefore, in order to improve the efficiency of aircraft flutter wind tunnel experiments, thereby improving the speed and quality of aircraft design, it is urgent to develop an all-resin integrated design and manufacturing method, using light-curing rapid prototyping technology with high precision, short time, low cost, No need for molds, integral molding and other advantages, overcome the shortcomings of traditional processes such as complex process, high cost, and long cycle, and realize the accurate, fast, and low-cost design and manufacture of aircraft low-speed flutter wind tunnel models

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