Pulsatile pressure frequency domain analysis method based on transient schlieren feature point time series data

By acquiring transient schlieren images through a high-speed schlieren acquisition system, extracting feature points and performing preprocessing, constructing time-series trajectories, calculating oscillating displacement differences, and utilizing fast Fourier transform to invert frequency domain features, the accuracy and interference problems of frequency domain analysis of aircraft pulsating pressure under complex operating conditions are solved, achieving high-precision non-contact monitoring.

CN122046556BActive Publication Date: 2026-06-23INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT
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Patent Information

Application Number
CN202610508946.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-04-17
Publication Date
2026-06-23
Estimated Expiration
2046-04-17

AI Technical Summary

Technical Problem

Existing technologies cannot accurately monitor the frequency domain characteristics of aircraft's pulsating pressure under complex operating conditions. Traditional methods interfere with the integrity of the flow field and are costly. Numerical simulations lack accuracy, and image analysis lacks a systematic process.

Method used

Transient schlieren images are acquired through a high-speed schlieren acquisition system, feature points are extracted and preprocessed, time-series trajectories are constructed, oscillation displacement differences are calculated, and frequency domain features are inverted using fast Fourier transform to achieve non-contact high-precision analysis.

Benefits of technology

It provides a systematic process, adapts to complex configurations and high-temperature scenarios, avoids flow field interference, has higher accuracy than traditional methods, simplifies the analysis process, and is suitable for the study of shock wave-load coupling in supersonic flow fields.

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Abstract

The application discloses a kind of pulsating pressure frequency domain analysis method based on transient schlieren feature point timing data, it is related to the cross technical field of intelligent fluid mechanics and aircraft aerodynamic test, comprising: S1, the transient schlieren image sequence related to isolation section is obtained by high-speed schlieren acquisition system, and the transient schlieren image sequence is preprocessed, to obtain corresponding flow field feature point timing data;S2, based on the acquisition timing of S1, the trajectory of the timing position of feature point in x direction is constructed;Based on timing position trajectory, the oscillation displacement sequence of each time is calculated, and the corresponding oscillation displacement difference sequence is obtained by differentiating processing to oscillation displacement sequence;S3, the time-domain signal in oscillation displacement difference sequence is converted into frequency-domain signal after fast fourier transform, and the corresponding power spectral density PSD curve is obtained.This application compared with traditional sensor measurement method, no flow field interference, can be adapted to complex configuration, and has greater application potential to high temperature scene.
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