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High-lift-to-drag ratio balance applied to low-speed wind tunnel

A technology with high lift-to-drag ratio and balance, which is used in the testing of machine/structural components, measuring devices, instruments, etc., can solve the problems that force-measuring balances are difficult to meet the requirements of high lift-drag ratio and start late, so as to improve measurement accuracy and anti-interference. ability, improve torsional stiffness, and improve the effect of test ability

Active Publication Date: 2015-06-17
CHINA ACAD OF AEROSPACE AERODYNAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of experimental equipment and other reasons, the experimental technology of large aspect ratio aircraft in my country started relatively late, and there are still many deficiencies in the design of high-lift-drag ratio high-precision force-measuring balances
[0003] At present, the FD-09 wind tunnel large-aspect-ratio drone is still using traditional force-measuring balances for force-measuring tests, which are difficult to meet the requirements of high lift-to-drag ratio

Method used

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  • High-lift-to-drag ratio balance applied to low-speed wind tunnel
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  • High-lift-to-drag ratio balance applied to low-speed wind tunnel

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Embodiment Construction

[0021] According to the distribution characteristics of the aerodynamic force of the UAV with a large aspect ratio, the resistance (X) and lateral force (Z) in the design load of the balance are small, and the lift (Y), rolling moment (Mx) and pitching moment (Mz) Larger, according to traditional design principles, the design load of the balance does not match. In order to solve the above problems, the present invention utilizes the antisymmetric arrangement The structure of the shape resistance measuring element and the flexible hinge is used to amplify the resistance output signal and reduce the interference of other components on the resistance. The eight-column beam combined force measuring element is used to replace the traditional four-column beam combined force measuring element, and the torsional stiffness is increased while the lateral bending stiffness is reduced, so as to ensure that the lateral force of the balance has a larger output signal and a smaller output s...

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Abstract

The invention provides a high-lift-to-drag ratio balance applied to a low-speed wind tunnel. The high-lift-to-drag ratio balance comprises a test model connecting cone, combined force measuring elements, a balance base body, resistance measuring elements, support sheets and a support rod connecting cone, wherein two ends of the balance base body are connected with the model connecting base and the support rod connecting cone through the combined force measuring elements; the balance base body is divided into an upper part and a lower part by an inclined groove which penetrates through the design center of the balance and runs through back and forth; the upper part and the lower part of the balance base body are connected into a whole through front, rear, left and right four groups of support sheets which are symmetrical about the design center of the balance; grooves are formed in the front part and the rear part of the balance base body symmetrically about the design center of the balance; the resistance measuring elements are arranged in the two grooves; and the resistance measuring elements are n-shaped beams (described in the specification); two ends of each n-shaped beam are connected with the balance base body through flexible hinges; and every two adjacent n-shaped beams are arranged anti-symmetrically about a longitudinal symmetric shaft in an up-front and down-back manner. The high-lift-to-drag ratio balance is high in high-lift-to-drag ratio balance, strong in antijamming capability and good in torsion resisting stiffness.

Description

technical field [0001] The invention relates to a balance with a high lift-drag ratio applied in a low-speed wind tunnel, in particular to a six-component force-measuring balance in a low-speed wind tunnel, which is mainly used in conventional wind tunnel tests of aircraft with a large aspect ratio. Background technique [0002] In conventional dynamometric tests in low-speed wind tunnels, the lift-to-drag ratio of the dynamometer balance is generally relatively small because the aspect ratio of the aircraft is not large. In recent years, with the rapid development of UAV technology, high-altitude and long-endurance UAVs have played an important role in the military field. If high-altitude and long-endurance UAVs want to fly high, fast, and long-lasting, their aerodynamic shape and layout generally adopt unconventional designs such as wings with a large aspect ratio, so that the lift-to-drag ratio of the whole aircraft reaches more than 30. In order to adapt to the research...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/06
Inventor 赵金海孙侃贾毅扬中艳
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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