Flexible film type multi-measuring-point pressure measuring belt for low-speed wind tunnel

A flexible film, multi-measuring point technology, applied in the direction of measuring fluid pressure, measuring fluid pressure through electromagnetic elements, measuring devices, etc., can solve the problems of lumen effect, difficulty in arranging pressure measuring points, distortion of sensor output waveform, etc. Reliability and precision, the effect of avoiding pressure transmission losses

Pending Publication Date: 2018-07-24
LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is very difficult to arrange pressure measuring points in some parts of the test model (such as helicopter rotor, wing trailing edge, wing-body junction, external storage, pelvic fin, etc.) due to structural limitations; at the

Method used

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  • Flexible film type multi-measuring-point pressure measuring belt for low-speed wind tunnel
  • Flexible film type multi-measuring-point pressure measuring belt for low-speed wind tunnel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] First, determine the required number of pressure measurement points according to the shape and physical size of the tested part of the test model, determine the number of pressure elements by the number of pressure measurement points, and determine the distance between each other by setting the position of the pressure measurement points according to the need, through the pre-calculated Size Determine the size of a single pressure measuring tape.

[0034] Such as figure 1 As shown, the substrate baseband is a flexible printed circuit board made of polyimide or polyester film material, and the signal line and power line are designed on the printed circuit board in advance according to the position of the pressure element. The printed circuit board is double Layer structure, the signal line is on one layer, and the power line is on another layer. The pressure element is a pressure-sensitive chip, which is packaged on the printed circuit board by SMD, and then a signal po...

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Abstract

The invention discloses a flexible film type multi-measuring-point pressure measuring belt for a low-speed wind tunnel. The flexible film type multi-measuring-point pressure measuring belt comprises asubstrate base belt and a protective layer arranged on the substrate base belt, wherein a plurality of pressure elements, signal lines and power supply lines for connecting the pressure elements, andreference pressure guide tubes are arranged between the protective layer and the substrate base belt; the reference pressure guide tube is input to each pressure element; and the substrate base belt,the protective layer and the components between the substrate base belt and the protective layer are packaged into a flexible belt-shaped whole body. The flexible film type multi-measuring-point pressure measuring belt provided by the invention has low processing difficulty, is fixed on the surface of a model in a pasting manner, and is convenient to mount and use, and a pressure signal generatedby airflow directly acts on a pressure sensitive chip, thus avoiding pressure transmission loss, effectively improving the reliability and accuracy of a measurement result, and enabling the dynamic pressure frequency to be 5kHz.

Description

technical field [0001] The invention relates to the field of low-speed wind tunnel measurement, in particular to a flexible film-type multi-measuring-point pressure measurement belt for low-speed wind tunnels and a manufacturing method thereof. Background technique [0002] Complex flow phenomena such as turbulent boundary layer, separation flow, shock wave oscillation, flow of local shape change, ablation, and oscillatory combustion in the flow around the aircraft will induce random dynamic pressure on the surface of the aircraft, which is called unsteady pressure. The intensity and frequency of unsteady pressure significantly affect the dynamic load characteristics of aircraft structures. If the frequency of the local unsteady pressure load is coupled with the natural frequency of the structure, it will cause the vibration of the structural parts, resulting in structural fatigue or even failure. Unsteady pressure is also the main source of aircraft aerodynamic noise, whic...

Claims

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Application Information

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IPC IPC(8): G01M9/06G01L9/00
CPCG01L9/008G01M9/06
Inventor 卢翔宇田昊陈正武王勇张俊龙唐道峰冉学军宋玉宝曾波左孔成刘赟黄奔雷红胜赵杰
Owner LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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