Pneumatic load simulator for undercarriage control test

Abstract

The invention discloses a pneumatic load simulator for an undercarriage control test, which belongs to undercarriage control test systems, and comprises a test bench, an undercarriage, an undercarriage jackstay actuating cylinder and a load loading device. The load loading device comprises slide rails, a loading pulley, a slide rail trolley, loading ropes and turntables, the undercarriage jackstay actuating cylinder is arranged on the test bench, an output end of the undercarriage jackstay actuating cylinder is connected in the middle of the undercarriage, the loading pulley is arranged at the lower end of the undercarriage, a lead screw, a linear guide rail, a servo motor and a mass block are radially arranged on each turntable which is arranged on a support frame, the upper end of each mass block is connected with a nut of the corresponding lead screw, one end of each loading rope is fixed onto the corresponding turntable, the other end of each loading rope bypasses the loading pulley to be fixed onto the slide rail trolley. The pneumatic load simulator adopting the closed-loop control technology has the advantages that test misoperation possibility is decreased, test precision is improved, and the pneumatic load simulator is applicable to undercarriages of various types.

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 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, and the landing gear is lowered during take-off and landing 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 retracting function of the landing gear strut cylinder and the uplock. Therefore, in the design and development stage of aircraft landing gear, it is necessary to ...

AI Technical Summary

Problems solved by technology

[0009] Aiming at the deficiencies of the prior art, the present invention provides a simulation scheme for the aerodynamic load of the landing gear. The servo motor is used to control the ball screw to push the mass block to slide to change the position of the center of gravity of the turntable, so as to generate eccentric torque to replace the loading of the cam structure. At the same time, the control The closed-loop control servo motor is used to simulate the aerodynamic load curve; it overcomes the shortcomings of the cam structure, such as poor loading control, low precision, and unique loading curve.

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