Inverted cup-type drop test bed cradle

Abstract

The invention discloses an inverted cup-type cradle for use in a drop test of a landing chassis, which is an important component for use in the simulation of the normal weight of an aircraft and the loading of the landing chassis of a landing chassis drop test bed and for forming a drop system with the landing chassis drop test bed. The cradle comprises a box body, a cradle top plate and a guide device using the inverted cup-type cradle to do linear motion vertical to the ground, wherein the guide device is fixed on two opposite sides of the box body; and the lower surface of the cradle top plate is provided with a fixing device for mounting the landing chassis to form a inverted cup-type structure, and the inside of the inverted cup-type structure is provided with a rigidity adjusting device. Compared with the conventional cradle, the inverted cup-type cradle has the advantages of saving the space and height and construction cost of the drop test bed, along with adjustable multidirectional rigidity, short power transmission route, large rigidity, and capacity for simulating the normal weight of a miniature aircraft.

Description

technical field [0001] The invention belongs to a kind of landing gear dynamic test device, which is an important component for simulating the equivalent weight of an aircraft, loading the landing gear and forming a falling body system with the landing gear drop shock test bench. Background technique [0002] The landing gear drop test is a dynamic characteristic test that simulates the landing impact of an aircraft. The landing gear system research, design and verification can be carried out through the drop shock test bench. The common drop test bench is column type, which is mainly composed of column frame, hanging basket, landing gear system, retractable mechanism, motion guiding mechanism, ground impact platform and so on. Among them, the hanging basket mainly plays the role of simulating the equivalent mass of the aircraft and serving as the installation carrier of the landing gear. The so-called equivalent weight here refers to the actual weight of the aircraft conve...

AI Technical Summary

Problems solved by technology

At present, many traditional hanging basket designs often do not consider the adjustable stiffness, or mainly consider the adjustable stiffness of the hanging basket in the vertical direction. There is still a lack of effective technical means for the simulation of the circumferential stiffness of the hanging basket (fuselage), and a local stiffness simulator is usually used. Realize the simulation of the structural deformation of the connection part of the landing gear joint, including the vertical and lateral stiffness simulation, regardless of the overall deformation of the airframe (see Gao Zejiong's "Aircraft Design Manual" Part 14: Design of Takeoff and Landing System)

[0006] 2. The structural rigidity of the hanging basket is insufficient

Since the gondola is placed above the landing gear, the moment is relatively large, that is, the force acting on the gondola and the column frame will be large, resulting in a relatively small equivalent stiffness of the gondola structure, which will adversely affect the drop test results

[0008] 3. The structure of the hanging basket is heavy

[0009] In order to overcome the lack of rigidity, the method of strengthening the hanging basket is often adopted to increase the weight of the hanging basket

When simulating a small aircraft, due to the relatively small equivalent weight it needs to drop, the drop test bench using the traditional hanging basket scheme often cannot meet the requirements

[0010] 4. High structural height

[0011] Since the gondola is placed above the landing gear, the gondola will occupy the structural height of the drop-shock test bench. If the area ratio is too large, the deflection of the drop column frame will be increased. Since the drop test is a shock vibration process, it will inevitably cause interference and errors to the test results.

In addition, since it is an indoor equipment, the higher the drop test bench, the higher the factory building where the test bench is placed, which will increase the construction cost

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