Wind speed accuracy controlling method and system of transonic-speed wind tunnel

Abstract

The invention provides a wind speed accuracy controlling method and system of a transonic-speed wind tunnel. The method comprises the following steps: S1, performing data normalization type fuzzy processing on variables inputted by a wind tunnel flow field prediction model under different preset conditions; S2, establishing a fuzzy model rule library of the wind tunnel flow field prediction modelbased on preset working conditions, acquiring a zero-order TS fuzzy model with multiple rules according to the variables after fuzzy processing, and establishing a fuzzy inference rule of a TS fuzzy system; S3, acquiring a matching degree of meeting an Mth fuzzy rule by an input variable according to the fuzzy inference rule; and S4, substituting the calculated matching degree into the TS fuzzy model, and weighting the outputs of all rules according to respectively occupied weights to obtain a Mach number model conforming to the blowing test accuracy. According to the invention, on the basis of the mode of combination of fuzzy control with prediction condition, the accuracy of the Mach number is controlled; the blowing test accuracy is realized well; and the wind tunnel flow field prediction model based on the fuzzy model prediction meets the blowing test requirement well.

Description

technical field [0001] The present invention relates to the field of aerospace technology, in particular, to a method and system for controlling wind speed accuracy based on a transonic wind tunnel. Background technique [0002] For safety and economic considerations, it is impossible for an aircraft to fly directly into the sky after it is manufactured, and wind tunnel tests are required during the design and manufacture process. A wind tunnel is a pipe-shaped ground device that simulates air flow. According to the principle of relativity of motion, the aircraft model or aircraft module is placed in an artificial airflow, and the flow of the airflow imitates what the aircraft encounters in real flight. In various situations, the data of each position of the aircraft model is collected. The most important indicator of a wind tunnel is the wind speed, which is the Mach number, and its control effect is directly related to the flow field quality of the wind tunnel and even to...

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Problems solved by technology

[0003] The design of the aircraft requires multiple blowing tests at different total pressures / static pressures and Mach numbers to obtain measurement data. The dynamic matrix controller of the wind tunnel flow field needs to measure the step response at different total pressures / static pressures and Mach numbers in advance. The data is controlled as a predictive model. In the test of frequently changing working conditions, it is necessary to conduct a step response test before each change of working condition, which not only delays the progress of the test, but also wastes a lot of step response tests train number

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