A Measuring Device for Roll Dynamic Test in Hypersonic Wind Tunnel

Abstract

The invention relates to a measuring device for a hypersonic wind tunnel rolling dynamic test, which comprises an elastic hinge, a linear bearing inner shaft, a rolling linear bearing, a check ring, a gasket, a fixing device and a strain gauge. The measuring device is simple in structure; the mode that the linear bearing is combined with the elastic hinge is adopted, and the linear bearing is used for limiting radial motion and air loads of a test piece, so that the test piece only generates axial rolling motion, a ball can make small-displacement motion axially, and the motion can better resist an axial load; the elastic hinge can accurately measure the rolling motion of the test piece (with the accuracy of 1 / 60 degrees); the linear bearing resists most axial and radial pneumatic loads, and fixing beams of the elastic hinge can be designed to be thinner, so that the motion frequency of the test piece and a measuring device system is reduced; and a requirement of the low motion frequency of the hypersonic test piece is better met.

Description

technical field [0001] The invention relates to a measuring device for rolling dynamic test in a hypersonic wind tunnel. Background technique [0002] There is a gap in the early domestic hypersonic rolling vibration 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. [0003] Later, although a rolling vibration dynamic balance that can be used for hypersonic speed appeared, in order to resist the large aerodynamic shock load in the hypersonic flow field, the balance beam is usually designed to be relatively thick, which makes the movement frequency of the specimen balance system relatively large, which cannot It meets the needs of low motion frequency simulation of hypersonic specimens. Contents of the invention [0004] The technology of the present invention solves ...

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Problems solved by technology

[0003] Later, although a rolling vibration dynamic balance that can be used for hypersonic speed appeared, in order to resist the large aerodynamic shock load in the hypersonic flow field, the balance beam is usually designed to be relatively thick, which makes the movement frequency of the specimen balance system relatively large, which cannot Meet the needs of low motion frequency simulation of hypersonic specimens

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