Flow detection method based on sound transmission signal

A technology of acoustic emission signal and flow detection, which is applied in the direction of volume/mass flow, measurement flow/mass flow, liquid/fluid solid measurement and other directions generated by mechanical effects, and can solve signal distortion, inaccurate measured signal, and flow influence Issues that cannot be ignored

Active Publication Date: 2019-07-26
王涵青 +3
View PDF7 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The insertion of the sensor will have a certain impact on the fluid flow, especially when the tube is small, the impact of the sensor probe on the flow cannot be ignored, the probe may become a new blunt body, and a new vortex street will be generated behind the probe, resulting in the measured signal being inconsistent. allow;
[0012] (2) The environmental requirements are relatively high. For relatively harsh factory environments, such as: high temperature, high pressure and other environments may cause signal distortion and large measurement errors

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Flow detection method based on sound transmission signal
  • Flow detection method based on sound transmission signal
  • Flow detection method based on sound transmission signal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043]In a plexiglass tube with a length of 6000mm and an inner diameter of 50mm, a wedge-shaped blunt body with a width of 15mm is set, and water is used as the medium. , 0.637m / s, 0.708m / s, 0.778m / s, 0.849m / s. Passive acoustic emission transducers are pasted at 50mm, 100mm, 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, and 600mm downstream of the blunt body. The sampling frequency is 16kHz, and each sampling time is 20s. device see figure 1 .

[0044] At different liquid velocities, the acoustic emission signals of water colliding with the wall are measured by several passive acoustic emission transducers at different positions on the pipeline wall to determine the frequency of the Karman vortex street and the evolution law of the vortex. The acoustic emission signal is subjected to fast Fourier transform to obtain a spectrogram, from which the signal frequency f can be obtained. The acoustic energy is distributed along the axial direction of the pipeline...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a flow detection method based on a sound transmission signal. The sound transmission signal in a pipeline is received, the received sound transmission signal is analyzed, and thus the flow of a fluid is detected. The method has the characteristics of high sensitivity, safety, environmental protection, simpleness, convenience, quickness and the like, the distribution frequency of a Carmen vortex street and the St dimensionless number of a pipeline system can be accurately determined, and great significance for development and application of a Carmen vortex street flow meter is achieved.

Description

technical field [0001] The invention relates to a flow detection method based on an acoustic emission signal, which can be used in a vortex flowmeter. [0002] technical background [0003] Karman vortex street is an important phenomenon in fluid mechanics. It is often encountered in nature. Under certain conditions, when the fluid bypasses some objects, the two sides of the object will periodically shed double lines with opposite rotation directions and regular arrangements. The vortex, after nonlinear action, forms a Karman vortex street. For example, water flowing through bridge piers, wind blowing through tall towers, chimneys, wires, etc. will form Karman vortex streets, so studying Karman vortex streets can help us avoid disadvantages. The frequency of vortex emission is an important parameter of Karman vortex street, which has important value for practical application. On the one hand, the Karman vortex street may have extremely adverse effects on the actual producti...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/32G01F15/06
CPCG01F1/3209G01F15/068
Inventor 王涵青叶涵辰郭燕妮林王旻
Owner 王涵青
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap