Zero point error processing method for wind tunnel test data of symmetrical aircraft

Abstract

The invention provides a zero point error processing method for the wind tunnel test data of a symmetrical aircraft. The method comprises a step of selecting a basic flight attitude with symmetry as astandard state of a zero point of the wind tunnel test data, a step of determining aerodynamic force resultant force in a cross section of the aircraft and a direction and a size of a resultant moment when a synthetic attack angle is zero, a step of decomposing the resultant force in the cross section of the aircraft and the resultant moment under a rotating body shaft system to obtain new valuesof corresponding force and moment, a step of obtaining new values of axial force and rolling moment zero point through algebraic averaging, a step of obtaining a difference between old and new values, a step of adding the above difference to old data changing with the synthetic attack angle to obtain new data and realizing the overall translation of a curve for matching use. According to the method, starting from the physical reality that a zero point state is the same one, an idea of zero point force and torque normalization is provided, the zero point error processing method for the windtunnel test data of the symmetrical aircraft is established, the installation error of a wind tunnel test model and a wind tunnel flow field uniformity error can be comprehensively considered, the precision of wind tunnel test data is improved, and the problem of the interference of a zero point error is solved for guidance, control and the flight simulation and characteristic evaluation of an autopilot.

Description

technical field [0001] The invention relates to the field of test data error processing, in particular to a zero-point error processing method for symmetrical aircraft wind tunnel test data. Background technique [0002] The aerodynamic force and moment suffered by the aircraft are mainly obtained by calculation and wind tunnel test. There are experimental errors in any experiment, and wind tunnel experiments are no exception. From the design to the implementation of the wind tunnel test, there is already a complete set of simulation criteria and a number of related standards and specifications to guide the work. At the same time, the error of the measurement system has also formed a mature correction method. However, there is no standard correction method for the error sources such as the installation error of the wind tunnel test model and the uniformity error of the wind tunnel flow field, which are developed by man and time. Different aerodynamic designers use different...

AI Technical Summary

Problems solved by technology

There is no essential improvement to the above-mentioned false zero-point oscillation phenomenon, and there is still the interference problem of zero-point error

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