Aerodynamic load simulation device

Abstract

The invention discloses an aerodynamic load simulation device which belongs to the field of an aircraft landing gear folding and unfolding test system. A test bench of the device is fixed on the ground; the upper part of the test bench is provided with a support for supporting a hinged part between the landing gear and an aircraft body; a landing gear strut actuating cylinder is connected with an external hydraulic system; two sets of loading mechanisms are symmetrically arranged on both sides of the test bench which are arranged on the moving plane of the landing gear; each set of loading mechanism respectively connects the landing gear to a double-cam mechanism, then to a gear reducer and finally to a hydraulic actuating cylinder through two steel wire ropes. The inner and outer cam shapes in the double-cam mechanism are consistent with the loading curve which is required by a test; and according to the device, the hidden safety hazards during the test can be eliminated, the requirements on the stroke and rate of the hydraulic actuating cylinder can be reduced, and the fitting capability of the loading curve of the landing gear can be improved.

Description

technical field [0001] The invention relates to an aerodynamic load simulation device, belonging to an aircraft landing gear retractable test system. Background technique [0002] In order to improve the aerodynamics of the aircraft in flight, modern aircraft are generally designed with retractable landing gear. When flying in the air, the landing gear is retracted inside the fuselage or wing; during take-off and landing, the landing gear is lowered to bear ground load. Therefore, when the aircraft is flying in the air, it is necessary to complete the retracting and lowering actions of the landing gear. Due to the influence of air resistance, the landing gear will be affected by the aerodynamic force when retracting and extending. The aerodynamic force is evenly distributed on the landing gear and affects the retraction and retraction of the landing gear strut cylinder and the uplock. Therefore, in the design and development stage of aircraft landing gear, it is necessary...

AI Technical Summary

Problems solved by technology

[0006] The structure of this scheme is relatively simple, and the tracking performance of load simulation is better, but its disadvantage is that it has higher requirements on the hydraulic cylinder

[0008] The aerodynamic load of this scheme is relatively close to the real situation, and the load direction is good, but its shortcomings are as follows: first, the structural design is relatively complicated, and the number of steel wire ropes is too large to cause interference with the landing gear; second, according to the The size of the upper aerodynamic load can only be designed with a unique cam shape corresponding to it, and corresponding to some load conditions may not be able to design the corresponding cam to meet its loading requirements; There will be shaking, there is a certain safety hazard

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