Method for examining initial readings of wind tunnel measurement instrument

Abstract

The invention discloses a method for examining initial readings of a wind tunnel measurement instrument. The method includes the steps of continuously collecting the initial readings of the measurement instrument for 10 seconds at sampling frequency of 200Hz to 500Hz before a wind tunnel test; calculating the collected initial readings to respectively obtain characteristic values, such as an amplitude-frequency characteristic, a mean value, a peak-to-peak value and a corresponding physical quantity, of each measurement instrument initial reading signal; subjecting the current characteristic values of each measurement instrument initial reading signal and characteristic values and property indexes of the normal instrument to comparative analysis to achieve the purpose of examining and conforming work states of the measurement instrument. When the method is used for examining the initial readings of the wind tunnel measurement instrument, the sampling frequency of the initial readings reaches up to 200Hz to 500Hz, the data size is large, and much information is carried; during comparative analysis, a signal frequency spectrum characteristic, the peak-to-peak value, the corresponding physical quantity, the current values and the like are extracted from a large number of data for analysis, so that examination of the initial readings is more thorough and comprehensive.

Description

technical field [0001] The invention belongs to the technical field of aerodynamic wind tunnel tests in the aerospace industry, and relates to a method for checking initial readings of wind tunnel measurement equipment. Background technique [0002] As an important part of experimental aerodynamics, the main task of the wind tunnel test is to use the wind tunnel to carry out aircraft simulation tests, and to measure the attitude of the aircraft model in the wind tunnel and the physical quantities such as force, torque, pressure, and temperature. This measurement work is done by wind tunnel measurement equipment. The initial reading of the wind tunnel measurement equipment is the output value of the wind tunnel measurement equipment before the wind tunnel test. [0003] In order to ensure the accuracy and reliability of the wind tunnel measurement data, it is necessary to conduct a comprehensive inspection and confirmation of the working status of the measurement equipment b...

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Problems solved by technology

[0007] From the shortcomings of the above method, it can be seen that this inspection method can only perform superficial analysis and judgment on the measurement equipment, and cannot conduct a more in-depth inspection of the measurement equipment. It is easy to cause deep faults in the measurement equipment to be difficult to find, resulting in a decline in the quality of measurement data. Even the serious consequences of data scrapping

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