Displacement element for wind tunnel pitching dynamic derivative test and design method of displacement element

Abstract

The invention discloses a displacement element for a wind tunnel pitching dynamic derivative test and a design method of the displacement element. The main body of the displacement element is a square cylinder; the two ends of the displacement element are provided with installation interfaces fixedly connected with a dynamic derivative balance; and the central position of the displacement element is provided with a cross beam composed of a plurality of strip-plate-shaped measuring beams which intersect with each other. The design method comprises the following steps: firstly, acquiring the maximum diameter of the dynamic derivative balance matched with the displacement element; calculating the length, theoretical thickness and equivalent thickness of the cross beam; calculating the width of a single measuring beam according to constraint conditions; creating a three-dimensional model of the displacement element, and measuring the strain value of the beam through calculation; calculating the design thickness of the cross beam of the displacement element; reconstructing the displacement element according to the design thickness of the cross beam, verifying whether the cross beam of the displacement element meets rigidity and strength requirements, and repeatedly iterating until the rigidity and strength requirements are met; and finally determining the length of the cross beam, the design thickness of the cross beam, the included angle of the cross beam, the width of the single measuring beam and the distance between adjacent single measuring beams.

Description

technical field [0001] The invention belongs to the technical field of wind tunnel tests, and in particular relates to a displacement element used in wind tunnel pitch dynamic derivative tests and a design method thereof. Background technique [0002] In the wind tunnel test, the forced vibration test technology can be used to obtain the dynamic derivative of the aircraft. One of the key technologies of the forced vibration dynamic derivative test technology is to be able to accurately obtain the amplitude of the model at different times, and the displacement elements of the cross-beam structure can be more accurately measured. Model amplitude. At present, the design of cross-beam displacement elements is more dependent on the work experience of researchers. The obvious disadvantage is that the design cycle is usually a few days, the workload is heavy, and it is not convenient for users to learn and master. [0003] At present, a displacement element and its design method f...

AI Technical Summary

Problems solved by technology

At present, the design of cross-beam displacement components is more dependent on the work experience of scientific researchers. The obvious disadvantage is that the design cycle is usually a few days, the workload is heavy, and it is not convenient for users to learn and master.

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