A correction method for test data of force measurement with continuously variable angle of attack in wind tunnel

Abstract

The invention discloses a correction method for wind tunnel continuous variable-attack-angle force measurement testing data. A correction amount comprises balance signal delay, model self-weight, balance supporting rod elastic corners and model inertia force and centrifugal force. Under the non-wind state, a model runs periodically according to a certain angle interval, in the running process, anattack angle and a balance signal are continuously collected according to a fixed sampling rate, cross-correlation functions of all components of a balance and the attack angle are calculated separately, and precise delay of all the components of the balance relative to the attack angle can be obtained according to peak values of the cross-correlation functions. After self-weight data and testingdata are subjected to digital filtering and delay correction, angle relations between the balance supporting rod elastic corners and all systems of axes are calculated and in combination with balancefiles, and an actual attack angle of the model can be obtained; the self-weight data and the testing data are subjected to interpolation separately at a certain attack angle interval, one kind of interpolation data is subtracted from the other kind of interpolation data, and accordingly correction of self-weight, inertia force and centrifugal force of the model can be conducted at the same time.

Description

technical field [0001] The invention belongs to the technical field of aerospace aerodynamic wind tunnel tests, and in particular relates to a method for correcting test data of wind tunnel continuously variable angle of attack force measurement. Background technique [0002] A wind tunnel is a tubular test device that produces a controllable and uniform airflow to simulate the aerodynamic phenomena of an aircraft at different flight altitudes and speeds. The wind tunnel dynamometric test refers to the test of measuring the aerodynamic force of the airflow acting on the model through the strain balance. The conventional step dynamometer test adopts the method of model running in steps. After the model runs to the specified angle of attack, the acquisition system completes the acquisition, and then the model runs for the next angle of attack, and completes the acquisition of all angles of attack in turn. After the test, the aerodynamic force and moment coefficients can be di...

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Problems solved by technology

[0004] Affected by the inertial force, centrifugal force and aerodynamic lag of the model, and the data inconsistency between the angle of attack and the balance signal after the signal conditioning and acquisition system, it is impossible to directly use the test data of the continuous variable angle of attack force measurement for calculation, and the test data needs to be calculated. fix

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