A rotating shaft type model hinged fixing structure and rotating shaft supporting method

Abstract

The invention relates to a hinging fixing structure of a rotating shaft type model and a rotating shaft supporting method. The hinging fixing structure comprises a supporting rod, a rotating shaft rodpiece, two clamping pieces and two end portion fixing nuts. The supporting rod is symmetrically provided with two truncated cone holes in the radial direction, and the upper bottom of a truncated cone is positioned on the axis of the supporting rod. The model is radially provided with an installation through hole. The supporting rod is positioned in the model, and the truncated cone holes in thesupporting rod are coaxial with the installation through hole. The rotating shaft rod piece is positioned in a coaxial hole. The two clamping pieces with central circular holes sleeve the rotating shaft rod piece and are arranged in the truncated cones and the installation through hole. Threads are arranged at two ends of the rotating shaft rod piece and are matched with the end portion fixing nuts to ensure that the two clamping pieces are tightly pressed and the model has the freedom of rotation only around the rotating shaft rod piece. By means of the hinging fixing structure of the rotating shaft type model and the rotating shaft supporting method, the vibration mode of the model can be simulated more accurately, so that the purposes of improving test precisions and increasing the accuracy of wind tunnel test simulation are realized.

Description

technical field [0001] The invention relates to a hinged fixed structure of a rotating shaft type elastic model, which belongs to the field of aerospace engineering. Background technique [0002] When carrying out some dynamic wind tunnel tests, it is necessary to design the model and provide elastic hinged fixed support for the model. The support position is usually the node position of the mode shape of the model vibration, and the model can rotate but cannot be translated at the node position. Usually, the design method of the elastic support of the model is: use the slender thin-walled beam structure to realize the simulation of the elastic hinge point. [0003] The existing model hinge fixed structure has the following problems: [0004] (1) The position control of the nodes is not accurate. During the design process, it is hoped that the fixed sleeve of the model cannot move in translation, but only rotates. However, in the actual model connection process, the rod fi...

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Problems solved by technology

[0004] (1) The position control of the nodes is not accurate. During the design process, it is hoped that the fixed sleeve of the model cannot move in translation, but only rotates

However, in the actual model connection process, the rod fixing sleeve is fixed by the model, which can only ensure that the rod fixing sleeve does not move in translation, but cannot guarantee that the model fixing sleeve does not move in translation

[0005] (2) The torsion center of the joint is not accurate. During the design process, it is hoped that the model can rotate around the fixed sleeve of the model, but in the actual model connection process, the center of rotation is the root of the fixed sleeve of the joint.

[0006] (3) At the static moment of the installation, since the thin wall is usually relatively thin, it will produce a certain elastic deformation under the gravity of the model, which will also affect the simulation of the actual flight state of the model

[0007] (4) The test has high requirements for the thickness design of the thin-walled beam. If the thickness of the thin-walled beam is too large, the simulation of elastic torsion cannot be realized; if the thickness of the thin-walled beam is too small, the purpose of supporting the model cannot be achieved

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