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Research Papers

Onset of Nucleate Boiling Detection in a Boiler Tube by Wavelet Transformation of Vibration Signals

[+] Author and Article Information
Seyed Majid Yadavar Nikravesh

Department of Mechanical Engineering,
Shahid Beheshti University,
Tehran 16589-53571, Iran
e-mail: m_yadavarnik@sbu.ac.ir

Hossein Taheri

Center for Nondestructive Evaluation (CNDE) and
Mechanical Engineering Department,
Iowa State University,
Ames, IA 50011
e-mail: htaheri@iastate.edu

Manuscript received October 3, 2017; final manuscript received April 1, 2018; published online May 7, 2018. Assoc. Editor: Ed Habtour.

ASME J Nondestructive Evaluation 1(3), 031005 (May 07, 2018) (7 pages) Paper No: NDE-17-1094; doi: 10.1115/1.4039939 History: Received October 03, 2017; Revised April 01, 2018

Condition monitoring and fault diagnosis techniques are increasingly used for assurance of machine condition and safe operation of the systems and structures. For this purpose, preliminary data about the machine performance are obtained from the system and signal processing techniques are used to extract features and final information regarding the machine performance. One type of the primary data that can be obtained from a system is the vibration responses of the system. Vibration responses of dynamical systems are usually nonstationary signals. In boilers and heat exchangers, generation and collapse of the vapor bubbles due to overheating can generate vibration in the tubes. These vibrations could be detected and identified in terms of location and time of occurrence for future maintenance and modification of the system and process. In this paper, a nonstationary vibration analysis method based on Morlet wavelet transform is presented for detection of onset of nucleate boiling (ONB) in a boiler tube. Comparison of the results by wavelet transform and visual observation of the ONB shows the capability and accuracy (less than 3% difference) of the proposed technique for detection of ONB in a boiler tube.

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References

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Figures

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Fig. 1

Flowchart of the study procedure

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Fig. 2

Experimental apparatus used in the study

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Fig. 3

Schematic drawing of nucleate boiling location, vapor bubbles in the tube and location of sensors

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Fig. 4

Contour plot of the wavelet decomposition of the vibration signal received at sensor 1 (a) and sensor 2 (b)

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Fig. 5

Schematic of the wave speed measurement in the water tube's wall using a mechanical impact load and time of flight difference between sensors 1 and 2

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Fig. 6

Boiling nucleation location along the tube during increasing the heating power

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Fig. 7

Comparison between the PSD at boiling and nonboiling conditions for (a) experiment 1, (b) experiment 2, and (c) experiment 3

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Fig. 8

Wavelet coefficients of the signals at the (a) sensor 1 and (b) sensor 2

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Fig. 9

Comparisons of different points of wavelet coefficients, in the scale related to 8638 Hz

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