Study on acoustic time delay localization in boiler tube arrays considering effective sound velocity

A method of computation of eigenfrequencies of large tube arrays is presented, which is based on homogenization techniques. It is supposed that the fluid is compressible, at rest and contained in a cavity; the bundle geometry is assumed to be repetitive; an equivalent sound velocity through the tubes can then be calculated, and the fluid-structure interaction is taken into account. A new eigenvalue problem is so obtained, defined over a simpler domain, i.e., the region occupied by both fluid and tubes; it is then easy to solve it for computing the eigenfrequencies of the coupled system. Numerical and experimental results are presented and some details of the experimental apparatus are given.

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The Algorithm of Acoustic Location for Boiler Tube Leakage

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.97-101.3024 ◽

2010 ◽

Vol 97-101 ◽

pp. 3024-3027

Author(s):

Peng Tong ◽

Lian Suo An ◽

Gen Shan Jiang ◽

Yu Qing Wang

Keyword(s):

Time Delay ◽

Cross Correlation ◽

Accurate Result ◽

Correlation Method ◽

Estimation Algorithm ◽

Time Delay Estimation ◽

Delay Estimation ◽

Value Of Time ◽

Noise Power ◽

Boiler Tube

The time delay estimation algorithm based on generalized cross correlation, can suppress the noise power effectively. More accurate result can be gotten by this method of time delay estimation. It is proved by simulation and experimentation that the estimated value of time delay given by generalized cross correlation method is more accurate than which is given by basic correlation method when the signal and noise ratio is stationary, thus the location result based on the time delay is more accurate.

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Acoustic radiation and cold point defect in boiler tube arrays based on phononic crystals theory

Applied Thermal Engineering ◽

10.1016/j.applthermaleng.2017.05.103 ◽

2017 ◽

Vol 123 ◽

pp. 746-752 ◽

Cited By ~ 3

Author(s):

Genshan Jiang ◽

Yuechao Liu ◽

Weilong Xu ◽

Qian Kong

Keyword(s):

Point Defect ◽

Acoustic Radiation ◽

Phononic Crystals ◽

Boiler Tube ◽

Tube Arrays ◽

Cold Point

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Effect of sound velocity on time delay estimation based on double beam forming algorithm

2017 IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC) ◽

10.1109/icspcc.2017.8242474 ◽

2017 ◽

Author(s):

Shi Yi ◽

Gang Wang ◽

Fuchen Liu

Keyword(s):

Time Delay ◽

Sound Velocity ◽

Time Delay Estimation ◽

Delay Estimation ◽

Beam Forming ◽

Double Beam

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Time Delay Estimator for Boiler Tube Leakage Localization

ASME 2011 Power Conference, Volume 2 ◽

10.1115/power2011-55442 ◽

2011 ◽

Author(s):

Liansuo An ◽

Peng Wang ◽

Guoqing Shen ◽

Jie Shi

Keyword(s):

Time Delay ◽

Background Noise ◽

Cross Correlation ◽

Signal To Noise Ratio ◽

Estimation Algorithm ◽

Time Delay Estimation ◽

Boiler Tube ◽

Boiler Furnace ◽

Direct Energy ◽

Leakage Location

The inference of strong background noise and reflected by the wall and tube rows surface makes it impossible that justify accurately leakage position employing the characteristic received by multi-channel sensors. It is the ‘bottleneck’ for promoting the accuracy of boiler tube leakage location. The 600MW supercritical boiler model was established, the leakage source propagation process of reflection and attenuation in boiler furnace was simulated by EASE. The approximate signal to noise ratio (SNR) was obtained and the reverberation time was calculated with the squared impulse response integration method on the foundation of simulation. The time delay estimation algorithm PTN, SWITCH derived from PHAT and ML, respectively, are proposed and experiments results revealed the superiority over the classical generalized cross correlation (GCC) method in reverberant and noisy boiler background. Although SWITCH is outperformed by PTN slightly, but the prior knowledge of reverberant energy to direct energy ratio may be hard to obtain in practice and frequencies onset detection is required in PTN method, so the implementation of SWITCH is much easier.

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