A Single Vector Dynamic Calibration Method for Impulse Wind Tunnel Force Measuring System

Abstract

The invention provides a single-vector dynamic calibration method for a pulse wind tunnel force measurement system. A force measuring system is connected with a step load loading / unloading mechanicaldevice through a stay wire; a data acquisition system is used for acquiring data before and after force application of the stay wire; a combined load after zero load and tension load processing is used as an output sample; a multi-component step load when the stay wire is cut off is used as an input sample to be substituted into a convolutional neural network for training to obtain an artificial intelligence model for eliminating interference signals in the step load, then the artificial intelligence model is applied to processing of pulse type wind tunnel force measurement test data in a current state, and finally a real aerodynamic force load is obtained. The wind tunnel balance directly reads the load value along the pull force vector direction of the pull wire, introduces the convolutional neural network technology for dynamic calibration, eliminates interference signals caused by inertial vibration and then is directly applied to an experiment, thereby improving the calibration efficiency, improving the measurement precision of the transient aerodynamic force of the pulse type wind tunnel, and reducing the measurement error.

Description

technical field [0001] The invention relates to the technical field of aerodynamics, in particular to a method for realizing single-vector dynamic calibration of a pulse wind tunnel force measurement system by using a neural network. Background technique [0002] In the wind tunnel test, the incoming flow of the pulse-type wind tunnel will cause impact on the tested model, so that the tested model will not only bear the influence of the normal wind tunnel, but also produce structural inertial vibration, such as figure 2 As shown, the inertial vibration cannot be completely attenuated within the effective test time, and the vibration signal generated by the inertial vibration will have a great impact on the measurement results of the balance, and the inertial vibration is not suitable for the structure of the force measuring system or the balance structure with poor stiffness. Its impact is fatal, making the traditional conventional strain balance can not be used normally in ...

AI Technical Summary

Problems solved by technology

[0002] In the wind tunnel test, the incoming flow of the pulse-type wind tunnel will cause impact on the tested model, so that the tested model will not only bear the influence of the normal wind tunnel, but also produce structural inertial vibration, such as figure 2 As shown, the inertial vibration cannot be completely attenuated within the effective test time, and the vibration signal generated by the inertial vibration will have a great impact on the measurement results of the balance, and the inertial vibration is not suitable for the structure of the force measuring system or the balance structure with poor stiffness. Its impact is fatal, making traditional conventional strain balances impossible to use in pulse-type wind tunnels

[0003] In addition, the existing test process in the pulse-type wind tunnel sometimes ends in a very short time, such as 1 millisecond, and even a complete synchronous output signal will not be generated within this time. For this type of half cycle or In the case of one cycle, the existing conventional balance is completely unable to handle

[0004] In addition, the equipment for statically adjusting the balance in the prior art is bulky, so it can only be performed outside the wind tunnel, and the adjustment at this time is only for the balance itself. It requires extremely complex connection and calculation methods to obtain load data under multiple components, and a slight error may affect the test results

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