Statistical Processing of the Strain-Gauge Weighing Tests of the Aerodynamic Forces

Abstract

The paper considers a technique for statistical processing of results of the aerodynamic experiment using the three-component in-model strain-gauge weighers to determine the aerodynamic loads. It provides design features of the strain-gauge weighers, operating principle of the strain-gauge resistor sensors, and the scheme of the weighing aerodynamic experiment using the in-model strain gauge weigher. Planning the experiment assumes that the adopted regression analysis assumptions are valid; and the initial mathematical model coefficients would be assessed using the least squares method, which makes it possible to obtain the best linear estimates. The aerodynamic forces and torque influence on the studied resulting indicator is confirmed using the correlation analysis. Dependence degrees of the aerodynamic forces and torques are studied and measured in the correlation analysis. The aerodynamic loads distribution is shown in the Table, where frequencies of the aerodynamic load values pairs are indicated. At the intersection of each column and row in the Table, a frequency is provided indicating, how many times at the given values of the aerodynamic drag force there are specified values of the lift force. Analysis of the aerodynamic loads pairwise action is performed. The number of degrees of freedom is computed according to the general rule: the number of degrees of freedom is equal to the number of all the indicators, from which the dispersion is computed, reduced by the number of relations connecting them

Please cite this article in English as:

Sidnyaev N.I., Battulga E. Statistical processing of the strain-gauge weighing tests of the aerodynamic forces. Herald of the Bauman Moscow State Technical University, Series Mechanical Engineering, 2025, no. 2 (153), pp. 50--69 (in Russ.). EDN: OIELDG

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