Method for accurately synchronizing test signals of wind tunnel

Abstract

The invention provides a method for accurately synchronizing test signals of a wind tunnel. The method comprises the following steps of: 1, measuring a delay time difference, namely changing an aircraft model arranged in the wind tunnel back and forth in an attitude angle variation region according to given velocity, acquiring data of all component output signals of a strain balance and data of output signals of an attitude angle sensor uniformly, continuously and synchronously according to a certain acquisition rate through a measurement system, transmitting into a computer, performing computational analysis on cross-correlation functions between the data of all the component output signals of the strain balance and the data of the output signals of the attitude angle sensor respectively through the computer, and solving the delay time difference between all component electrical signals of the strain balance and electrical signals of the attitude angle sensor; and 2, performing synchronous correction, namely performing accurate synchronous correction on the data of all the measured component electrical signals of the strain balance according to the acquired delay time difference in the wind tunnel test process. The method has the outstanding advantage of capability of accurately synchronizing the test signals of the wind tunnel finally.

Description

technical field [0001] The invention relates to the technical field of aerodynamic wind tunnel tests in the aerospace industry, in particular to a method for realizing precise synchronization of various measurement signals in high-speed wind tunnel tests. Background technique [0002] The wind tunnel dynamometer test is the most basic wind tunnel test item for aircraft models. The purpose is to measure the aerodynamic characteristics of the aircraft when the attitude angle changes, and it is required to accurately give the corresponding aerodynamic force and aerodynamic moment values ​​of the aircraft at a specific angle. In wind tunnel tests, the attitude angle of the aircraft is usually measured by an angle sensor or a displacement sensor, while the aerodynamic force and aerodynamic moment are measured by a resistance strain balance (usually a six-component balance). Due to the different response characteristics of the angle sensor, the displacement sensor and the balance,...

AI Technical Summary

Problems solved by technology

[0004] In recent years, with the development of the research work on the continuous variable angle of attack force measurement technology of the temporary high-speed wind tunnel in China, because the running speed of the model attitude angle cannot be reduced, and the model cannot be stopped to wait for synchronization, the physical response of the sensor is delayed. The resulting measurement signal asynchronous impact on the test data is highlighted, resulting in the translation of the aerodynamic characteristic curve, which seriously affects the accuracy of the force test data