Drop test device and drop test method of lander landing gear

Abstract

The invention discloses a drop test device and a drop test method of a lander landing gear. The device comprises a lifting system, a drop system, a load collection system and a rack system, the lifting system is fixed to the rack system, the drop system is arranged on the rack system and can vertically slide, and the load collection system is arranged below the drop system; the landing postures of landing support legs in the drop system are adjusted, the landing postures are fixed, the drop system is lift to a predetermined height, the drop system freely slides along a sliding strut under the action of gravity, foot pads on the landing support legs are in contact with a six-dimensional force measurement platform to simulate the collision process of the lander and the ground, and data are recorded. The drop test device disclosed by the invention has the advantages of simple structure, smaller structure weight and high test measurement accuracy.

Description

[0001] Technical field: [0002] The invention relates to a drop shock test device and a test method for landing gear of a lander. [0003] Background technique: [0004] The landing gear drop test is a dynamic test to simulate the landing impact of the aircraft. In order to prevent the structural components of the aircraft from being overloaded during the landing impact, the landing gear must effectively absorb the energy generated by the landing impact. The drop shock test is to verify the impact of the landing gear. While the buffer system satisfies the amount of absorbed energy, whether the technical indicators such as the overload of the landing gear and the service stroke meet the design requirements, and whether the structure can achieve the expected strength and rigidity. [0005] The common drop test bench is column type, mainly composed of column frame, hanging basket, landing gear system, retractable mechanism, motion guiding mechanism, ground impact platform and so ...

AI Technical Summary

Problems solved by technology

In the case of a large overturning moment of the hanging basket, the surface friction between the bushing and the sliding pillar is relatively large, and the falling acceleration of the hanging basket is small, which leads to an increase in the sliding distance requirement during the acceleration process, and the large friction force will affect the effect of the drop shock test. Cause adverse effects; there is a large gap between the roller and the sliding pillar, which increases the impact of the turning moment on the structure, the attitude angle of the hanging basket changes greatly, and the supporting rigidity of the hanging basket is small, which is difficult to meet the test requirements

Moreover, the connecting points of the hanging basket of the traditional landing gear and the four pillars are located on the same horizontal plane. If the assembly gap is not considered, the structure is a statically indeterminate structure, and the calculation of the supporting force of the sliding pillar is complicated;

[0009] 2) Insufficient rigidity of the hanging basket structure: the overturning moment generated above will generate a large internal force in the hanging basket structure, resulting in a relatively small equivalent stiffness of the hanging basket structure, which will adversely affect the drop test results;

[0010] 3) The basic structure of the hanging basket is heavy: In order to meet the rigidity requirements, the traditional landing gear drop test bench can only increase its structural rigidity by strengthening the hanging basket, which leads to an increase in its weight

The mass of the lander is relatively small, and the overhang of its landing gear is relatively large, which makes the structure of the gondola itself complex and heavy, making it difficult to meet the quality requirements of a 1 / 4 lander model.

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