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Control valve fault detection by acoustic emission: Data collection method

This project proposes acoustic emission (AE) technique for control valve fault detection. This paper discusses two methods used for data collection. Data acquisition system (DAQ) was used for retrieving data in time domain while spectrum analyzer was used for frequency domain data. | Journal of Automation and Control Engineering Vol. 4, No. 3, June 2016 Control Valve Fault Detection by Acoustic Emission: Data Collection Method Juwita Mad Juhani Universiti Pendidikan Sultan Idris, Tanjung Malim, Perak, Malaysia Email: juwita1987@gmail.com Rosdiazli Ibrahim and Intan Najiha Mohd Shukri Universiti Teknologi Petronas, Tronoh, Perak, Malaysia Email: rosdiazli@petronas.com.my, najihashukri@gmail.com movements with flow rate. Three types of control valve commonly found are quick opening, linear and equal percentage. These characteristics can be identified by plug shapes. This is shown in Fig. 2. However, these flow characteristics are true only when the pressure drop across control valve is constant. Abstract—Control valves are essential components in process control industry. They are the final control elements that play an important role to regulate flow rate. The condition of control valves affect the whole cycle of process. Therefore, information about their health would be useful to plant personnel during maintenance. This project proposes acoustic emission (AE) technique for control valve fault detection. This paper discusses two methods used for data collection. Data acquisition system (DAQ) was used for retrieving data in time domain while spectrum analyzer was used for frequency domain data. Index Terms—acoustic emission, detection I. control valve, fault INTRODUCTION Figure 1. Single seated control valve (b) Double seated control valve Control valve is a power operated device which regulates the fluid flow rate in a process control system. Basically, it consists of a plug and stem. The stem is manipulated by air pressure and the plug alters the orifice area in the flow path. The change of valve position is in response to a signal from the controlling system. There are two actions of pneumatic control valve; air to open and air to close. Air to open means the control valve opening gets larger linear to air supply. If air .