Temperature Compensation Method of Optical Fiber Pneumatic Measuring Balance

Abstract

The invention discloses a fiber aerodynamic force measurement balance temperature compensation method. The method comprises steps that (1), fiber strain gauges are mounted on the symmetrical positionof each measurement beam of a fiber aerodynamic force measurement balance as sensitive components of the balance for sensing the aerodynamic load; (2), the temperature calibration test on the fiber aerodynamic force measurement balance is carried out to acquire the temperature coefficient ratio of a negative strain fiber strain gauge and a positive strain fiber strain gauge at the symmetric position of each measurement beam of the fiber aerodynamic force measurement balance; (3), according to the acquired temperature coefficient ratio, combination subtraction operation of output signals of thetwo fiber strain gauges at the symmetric position of each measurement beam of the fiber aerodynamic force measurement balance is carried out to deduct thermal output of the fiber strain gauges causedby thermal strain of the measurement beam; (4), summation of the combined relationship of the two fiber strain gauges on the symmetrical position of the measurement beam of each measurement element of the fiber aerodynamic force measurement balance acquired in the (3) is carried out to acquire an output formula of each component deduction measurement beam of the fiber aerodynamic force measurement balance caused by thermal strain after thermal output.

Description

technical field [0001] The invention belongs to the technical field of aerospace force measurement test, and in particular relates to a method for temperature compensation of an optical fiber aerodynamic force measurement balance. Background technique [0002] The wind tunnel is the most basic test equipment for aerodynamic research and aircraft development. The model aerodynamic measurement test is the most important test item in the wind tunnel test. The aerodynamic measurement balance is the most basic and important part of the model aerodynamic test. Measuring equipment is used to measure the size, direction and action point of the aerodynamic load (force and moment) acting on the test model, and its performance indicators directly affect the accuracy of the force test data. [0003] Resistance strain balance is a kind of aerodynamic measurement balance widely used in aerodynamic measurement tests in various wind tunnels at home and abroad. The technology has been quite ...

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Problems solved by technology

[0003] Resistance strain balance is a kind of aerodynamic measurement balance widely used in aerodynamic measurement tests in various wind tunnels at home and abroad. The technology has been quite mature so far, but there are still bottleneck problems such as serious temperature effects and resistance to electromagnetic interference. The further improvement of its measurement accuracy

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