Unlock instant, AI-driven research and patent intelligence for your innovation.

Traveling wave tube measuring device and method for decoupling characteristic parameters of underwater acoustic material

A technology of underwater acoustic materials and characteristic parameters, which is used in the analysis of materials, the analysis of solids using sonic/ultrasonic/infrasonic waves, and the evaluation of water resources, etc. The effect of accuracy

Active Publication Date: 2019-11-08
THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, new requirements are put forward for the measurement of the decoupling characteristic parameters of underwater acoustic materials: (1) the working frequency is as low as that of passive sonar; (2) the working pressure is as high as the limit depth of the submarine; (3) not only To measure the sound pressure sound transmission coefficient, it is also necessary to measure the decoupling coefficient
[0003] The 50Hz-1000Hz frequency band is the most concerned frequency range for submarine acoustic stealth engineering and sonar equipment shock and noise reduction. It is almost impossible to measure the acoustic performance of underwater acoustic material samples in this frequency band in free fields such as anechoic pools, because water The wavelength of the sample is much larger than that of the measured sample, and the edge diffraction of the sample will seriously interfere with the measurement
However, it is difficult to measure the frequency as low as 50Hz by this method

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
  • Traveling wave tube measuring device and method for decoupling characteristic parameters of underwater acoustic material
  • Traveling wave tube measuring device and method for decoupling characteristic parameters of underwater acoustic material
  • Traveling wave tube measuring device and method for decoupling characteristic parameters of underwater acoustic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0033] Embodiment: As shown in the accompanying drawings, the traveling wave tube measurement device for the decoupling characteristic parameters of underwater acoustic materials mainly includes a thick-walled acoustic tube 25, a pair of transmitting transducers A6 and A6 mounted on the upper and lower ends of the traveling wave tube 10 Transmitting transducer B7, flush-mounted hydrophones 8, a set of electronic measuring instruments, measuring software and auxiliary equipment. Different from the traditional measurement of the shock and damping properties of material samples in air or in free-field waters, the measurement in the traveling wave tube 10 is more in line with the application characteristics and environment of the tested sample, making the measurement of the acoustic and vibration characteristic parameters of the sample more accurate and practical.

[0034] The traveling wave tube 10 is installed vertically. The traveling wave tube 10 has an inner diameter of Φ300m...

Embodiment 2

[0047] Embodiment 2: The present invention is carried out on the basis of establishing the traveling wave sound field in the traveling wave tube 10, and the measuring device is shown in the attached image 3 shown. The first step of the measurement is to establish a traveling wave sound field in the traveling wave tube 10, and emit a sound wave with the same amplitude and opposite phase as the transmitted sound wave of the sample 9 through the secondary emitter 26, so as to offset the transmitted sound wave of the sample 9, so that the transmitted sound wave of the sample is in the same range as the traveling wave. No reflection is formed at the top of the tube 10, so that the transmitted sound wave is equivalent to a traveling wave in the tube, similar to the infinite length of the acoustic tube 25, and the axial sound field is similar to a free field, so that the sample decoupling coefficient can be determined by continuous waves in the traveling wave tube 10 Measurement.

...

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

PropertyMeasurementUnit
The inside diameter ofaaaaaaaaaa
Login to View More

Abstract

The invention discloses a traveling wave tube measuring device and method for the decoupling characteristic parameters of an underwater acoustic material. The traveling wave tube measuring device is mainly characterized in that measurement of the sound pressure reflection coefficient, transmission coefficient and decoupling coefficient of an underwater acoustic material member under a variable-temperature and variable-pressure condition is realized through establishment of a 50-1000Hz underwater acoustic material vibro-acoustic characteristic parameter traveling wave tube calibration device; the vibration of the radiating surface of a transducer is coupled to a sample through a water layer, and the transfer function ratios between transmission sound waves and sound pressures as well as excitation vibration speeds when a sound-isolating and decoupling tile is attached and not attached to a specified steel plate base in order to obtain the decoupling characteristic of the sound-isolatingand decoupling tile; and in the measuring process, a force sensor is used for detecting the stability of the radiation head excitation of a transmitting transducer.

Description

technical field [0001] The invention relates to the field of underwater acoustic measurement and testing, in particular to a traveling wave tube measuring device and method for decoupling characteristic parameters of underwater acoustic materials. Background technique [0002] Hydroacoustic materials play a pivotal role in submarine acoustic stealth engineering and sonar equipment. In order to reduce the probability of the submarine being discovered by the enemy's passive sonar, it is necessary to reduce the low-frequency radiation noise of the submarine itself. The research and application of anechoic tiles and sound insulation decoupling tiles are developing rapidly, which is one of the key development directions of my country's submarine acoustic stealth technology. . The decoupling and vibration isolation performance of the basic array acoustic baffle, hydrophone module and its installation components in the sonar underwater acoustic system is also very important, which ...

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
IPC IPC(8): G01N29/09
CPCG01N29/09G01N2291/018G01N2291/02863G01N2291/023Y02A90/30
Inventor 李水易燕
Owner THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP