A piezoelectric balance calibration and use uncertainty evaluation method

Abstract

The invention discloses a piezoelectric balance calibration and use uncertainty evaluation method. The method comprises the following steps: calculating uncertainty U1i of each component of a piezoelectric balance introduced in a weight repeated loading process; calculating uncertainty U2i of each component of the piezoelectric balance introduced by the comprehensive loading error; calculating theuncertainty component U3i of each component of the piezoelectric balance introduced by the weight; calculating a deviation limit Bb, a precision limit Pb and uncertainty Ub carried by the calibratedpiezoelectric balance; when the piezoelectric balance is used for carrying out a force measurement test, using the uncertainty Ub carried by the piezoelectric balance as a deviation limit Btest = Ub to be transmitted to the next stage; using the calibrated piezoelectric balance to carry out m times of wind tunnel force measurement tests, and calculating a precision limit Ptest introduced in a repeated test process; calculating the uncertainty Utest of the force measurement test result based on the deviation limit Btest and the precision limit Ptest of the force measurement test result. According to the invention, the main error source in the calibration and use process of the piezoelectric balance can be identified, and the uncertainty level in the calibration and use process of the piezoelectric balance can be effectively and quickly evaluated.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric balance calibration and evaluation methods, and more specifically, the invention relates to a piezoelectric balance calibration and evaluation method for use uncertainty. Background technique [0002] In the aerospace industry, various types of balances are generally used to measure the aerodynamic load of the aircraft model under the action of the wind tunnel test airflow. The aerodynamic load generally includes three force vectors and three moment vectors, with a total of six components. In pulse-type wind tunnels such as shock tunnels, piezoelectric balances are mainly used to measure the aerodynamic loads on aircraft models in the wind tunnel flow field environment. In order to obtain accurate aerodynamic coefficient data in the wind tunnel test, the piezoelectric balance must be calibrated before the wind tunnel test. Piezoelectric balance calibration refers to simulating the force sta...

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Problems solved by technology

However, the exact values ​​of the modeled aerodynamic forces and aerodynamic moments are usually not known, so the concept of "error" loses its basis

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