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research-article

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, Iran
m_yadavarnik@sbu.ac.ir

Hossein Taheri

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

1Corresponding author.

ASME doi:10.1115/1.4039939 History: Received October 03, 2017; Revised April 01, 2018

Abstract

Condition monitoring and fault diagnosis techniques are increasingly used for assurance of machines condition monitoring and safe operation of the systems and structures. For this purpose, preliminary data about the machine performance is 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 should be detected and identified in term 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.

Copyright (c) 2018 by ASME
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