Device for hypersonic pitching dynamic test

A dynamic test, hypersonic technology, applied in aerodynamic test, measurement device, vibration test, etc., can solve the problem that the measurement value cannot be ignored and affect the measurement accuracy, and achieve the effect of improving the thrust capacity and simplifying the test mechanism.

Inactive Publication Date: 2010-09-22
CHINA ACAD OF AEROSPACE AERODYNAMICS
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  • Abstract
  • Description
  • Claims
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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

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  • Device for hypersonic pitching dynamic test
  • Device for hypersonic pitching dynamic test
  • Device for hypersonic pitching dynamic test

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[0028] The device required for the hypersonic pitch free vibration test has four characteristics:

[0029] 1. It can provide the degree of freedom in the pitch direction, and at the same time unload the load in the side and roll directions;

[0030] 2. The part of the pitching experimental device that feels the strain must have sufficient rigidity so as not to break after being stressed and damage other components in the test system;

[0031] 3. The dynamic aerodynamic force felt in the pitch direction should have a linear relationship with the strain of the balance system;

[0032] 4. In the pitch direction, the mechanical damping of the test device should be smaller than the aerodynamic damping provided by the aircraft in this direction.

[0033] Through careful analysis and research on the hypersonic flow field and the shape of the hypersonic aircraft (specimen), the present invention provides a test device for the free vibration test of the hypersonic wind tunnel in the p...

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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, which belongs to the field of technical balance measurement. Background technique [0002] There is a gap in the early domestic hypersonic pitching dynamic balance. The reason is that in the past, my country's dynamic research mainly focused on low speed. For hypersonic dynamic research, although theoretical and calculation work has been carried out, it has not yet reached the point of dynamic testing. 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 ignore...

Claims

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Application Information

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IPC IPC(8): G01M9/02G01M9/04G01M7/02
Inventor 宋玉辉李潜高清
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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