Device for hypersonic pitching dynamic test

Abstract

The invention relates to a device for a hypersonic pitching dynamic test, which comprises a test piece fastening cone, a connecting rod, an adjusting cone, pitching bearings, an elastic hinge and a bearing baffle plate. The elastic hinge consists of a spring piece of which two ends are provided with platforms and the middle bends into an alpha angle; and beveled edges on two sides are respectively adhered with two resistance strain gages for measuring the pitch angle strain. Due to the adoption of the elastic hinge with a special structure, the axial force of the pitching bearing is unloaded,the anti-thrust capability of the pitching bearing is improved; and when the device is used for measuring the strain capacity and angular movement, the testing accuracy can reach 1 / 60 degree. Due to the adoption of the elastic hinge with the special structure and replaceable thickness and material, the inherent frequency of the test device can be adjusted, and the test can be suitable for wider flying range chain. The test piece is fixed by four pitching bearings, so that pitching movement of the test piece is ensured, and moments of the test piece in the side direction and rolling direction can be unloaded. The test device is simple; and vibration is transmitted through main components, so that the angular movement and damping characteristics of a hypersonic aircraft in the process of dynamic pitching can be accurately provided.

Description

technical field [0001] The invention relates to a test device for free vibration dynamic force measurement in the pitch direction of a hypersonic wind tunnel, belonging to the technical balance measurement field. Background technique [0002] There is a blank in the early domestic hypersonic pitch dynamic balance. The reason is that in the past, the dynamic research in my country mainly focused on low speed. For the research on hypersonic dynamics, although theoretical and calculation work has been carried out, it has not yet reached the stage of dynamic testing. At present, the pitch test device that is widely used in dynamic tests at home and abroad is composed of a concentric mechanism, with a cone at the front end and a cylinder at the back end, and a "Z"-shaped beam in the middle. It does not include pitch bearings and elastic hinges, and there is stress in the lateral and rolling directions. Residual, in the low-speed test, this residual amount is small and can be ign...

AI Technical Summary

Problems solved by technology

At present, the pitching test device widely used in dynamic tests at home and abroad is composed of a concentric mechanism, the front end is conical and the rear end is cylindrical, and the middle is a "Z" shaped beam, which does not include pitching bearings and elastic hinges, and has stress in the lateral and rolling directions. Residue, when performing low-speed tests, this residual amount is small and can be ignored, while when performing hypersonic speed tests, the residual amount cannot be ignored relative to the measured value, which seriously affects the measurement accuracy

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