A high-precision wind tunnel force balance for coaxial parallel axial load measurement

Abstract

The invention relates to a high-precision wind tunnel force measuring balance for coaxial parallel type axial load measurement, belonging to the field of wind tunnel balance design. and the rear cone; the radial four-component load measuring element includes two groups of three-column beams with the same structure, and the two groups of three-column beams are respectively arranged at the axial ends of the axial load measuring element to form a six-component measuring element; the front cone , The six-component measuring element, the equal straight section and the back cone are connected coaxially in turn to form a force balance; the axial load measuring element includes the outer casing, the resistance supporting sheet beam group, the resistance measuring beam, the rolling moment measuring beam, the middle shell, Supports the inner shaft and the rolling moment support sheet beam group; the invention ensures that when the overall rigidity of the balance is large, the axial load measurement decoupling is realized, the measurement interference of other components on the axial component is avoided, and the measurement accuracy is improved.

Description

technical field [0001] The invention belongs to the field of wind tunnel balance design, and relates to a high-precision wind tunnel force measuring balance for coaxial parallel axial load measurement. Background technique [0002] Aerodynamic design is the forerunner of aircraft model development, and wind tunnel test is the most reliable means to verify the quality of aerodynamic design scheme and predict the aerodynamic performance of aircraft. As the core measuring element of the wind tunnel force test, the performance of the strain balance plays a decisive role in the test ability and force measurement accuracy. At present, the wind tunnel test of weapon models pays more and more attention to the small measurement capability and measurement accuracy of the axial load (rolling moment Mx and resistance X). For example, the resistance measurement accuracy of strategic and tactical missiles, aircraft, etc. directly determines the evaluation of key indicators such as their ...

AI Technical Summary

Problems solved by technology

For the wind tunnel strain balance, the axial load is the most difficult load component to measure. The main reasons include: 1) Due to the limitation of the wind tunnel model size and load characteristics, the slenderness of the balance structure is relatively large. At the same time, the axial load Generally smaller than other components by more than an order of magnitude, in order to ensure the measurement load matching and higher sensitivity output, it is necessary to strictly coordinate the contradiction between stiffness and sensitivity; There are different degrees of interference between the components on the axial direction, and most of them are nonlinear, which exacerbates the difficulty of axial load measurement; 3) Limited by the current traditional subtractive machining capabilities, it is impossible to improve its balance by designing a better balance structure. Measuring performance

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