A Three-Phase Quantitative Monitoring Method for CO2 Floods

1982 ◽  
Author(s):  
T. Richard Svor ◽  
Michael P. Globe
Keyword(s):  
Monitoring Method ◽  
Quantitative Monitoring ◽  
Three Phase

scholarly journals Comparison of Electrical and Vibration Analysis Methods for Mechanical Fault Monitoring in Wind Turbine Drivetrains

2019 ◽  
Vol 9 (1) ◽  
pp. 2-7
Author(s):  
P Granjon ◽  
P D Longhitano ◽  
A Singh
Keyword(s):  
Wind Turbine ◽  
Vibration Analysis ◽  
Wind Farm ◽  
Electromechanical System ◽  
Main Bearing ◽  
Monitoring Method ◽  
Fault Monitoring ◽  
Three Phase ◽  
Mechanical Faults ◽  
Electrical Generator

Mechanical faults occurring in drivetrains are traditionally monitored through vibration analysis and, more rarely, by analysing electrical quantities measured on the electromechanical system involved. However, a monitoring method that is able to take into account all of the information contained in three-phase electrical quantities was recently proposed. The goal of this paper is to compare this threephase electrical approach with the usual vibration-based method in terms of its capability to detect mechanical faults in drivetrains. In this context, a 2 MW geared wind turbine operating in an industrial wind farm was equipped with accelerometers near the main bearing and electrical sensors on the stator of the electrical generator for several months. During this period, an important mechanical fault occurred in the main bearing of the system. The evolution of the fault indicators computed by the two previous approaches were compared throughout this period of time. All of the indicators behaved similarly and showed the development of an inner bearing fault in the main bearing. This demonstrated that a mechanical fault occurring in a drivetrain can be monitored and detected by analysing electrical quantities, even if the fault is located some distance from the electrical generator.

scholarly journals Quantitative Monitoring of Tattoo Contrast Variations after 755-nm Laser Treatments in In Vivo Tattoo Models

Sensors ◽  
2020 ◽  
Vol 20 (1) ◽  
pp. 285
Author(s):  
Myeongjin Kim ◽  
Suhyun Park ◽  
Hyun Uk Lee ◽  
Hyun Wook Kang
Keyword(s):  
Laser Treatment ◽  
Quantitative Imaging ◽  
Imaging Method ◽  
Sprague Dawley ◽  
Scoring Method ◽  
Monitoring Method ◽  
Tattoo Removal ◽  
Quantitative Monitoring ◽  
Laser Treatments

Laser lights have been used by dermatologists for tattoo removal through photothermal interactions. However, most clinical studies used a visual scoring method to evaluate the tattoo removal process less objectively, leading to unnecessary treatments. This study aimed to develop a simple and quantitative imaging method to monitor the degree of tattoo removal in in vivo skin models. Sprague Dawley rat models were tattooed with four different concentrations of black inks. Laser treatment was performed weekly on the tattoos using a wavelength of 755 nm over six weeks. Images of non-treated and treated samples were captured using the same method after each treatment. The intensities of the tattoos were measured to estimate the contrast for quantitative comparison. The results demonstrated that the proposed monitoring method quantified the variations in tattoo contrast after the laser treatment. Histological analysis validated the significant removal of tattoo inks, no thermal injury to adjacent tissue, and uniform remodeling of epidermal and dermal layers after multiple treatments. This study demonstrated the potential of the quantitative monitoring technique in assessing the degree of clearance level objectively during laser treatments in clinics.

Rapid quantitative monitoring method for the fish spoilage bacteria Pseudomonas

2008 ◽  
Vol 10 (11) ◽  
pp. 1357 ◽  
Author(s):  
Eyjólfur Reynisson ◽  
Hélène Liette Lauzon ◽  
Hannes Magnusson ◽  
Guðmundur Óli Hreggvidsson ◽  
Viggó Thor Marteinsson
Keyword(s):  
Monitoring Method ◽  
Fish Spoilage ◽  
Quantitative Monitoring ◽  
Spoilage Bacteria

Monitoring Method for an Unbalanced Three-Phase HTS Cable System via Time-Frequency Domain Reflectometry

2018 ◽  
Vol 28 (4) ◽  
pp. 1-5 ◽  
Author(s):  
Geon Seok Lee ◽  
Gyeong Hwan Ji ◽  
Gu-Young Kwon ◽  
Su Sik Bang ◽  
Yeong Ho Lee ◽  
...  
Keyword(s):  
Frequency Domain ◽  
Cable System ◽  
Monitoring Method ◽  
Time Frequency ◽  
Three Phase ◽  
Frequency Domain Reflectometry

scholarly journals An Anti-Interference Online Monitoring Method for IGBT Bond Wire Aging

Electronics ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1449
Author(s):  
Chuankun Wang ◽  
Yigang He ◽  
Yunfeng Jiang ◽  
Lie Li
Keyword(s):  
Online Monitoring ◽  
Junction Temperature ◽  
Collector Current ◽  
Monitoring Method ◽  
Insulated Gate Bipolar Transistor ◽  
Igbt Module ◽  
Three Phase ◽  
Bond Wires ◽  
Bond Wire ◽  
Three Phase Inverter

Due to the constant changes of the environment and load, the insulated-gate bipolar transistor (IGBT) module is subjected to a large amount of junction temperature (Tj) fluctuations, which often leads to damage to the bond wires. The monitoring parameters of IGBTs are often coupled with Tj, which increases the difficulty of monitoring IGBTs’ health status online. In this paper, based on the collector current (Ic) and collector-emitter on-state voltage (Vce_on) online monitoring circuit, an online monitoring method of IGBT bond wire aging against interference is proposed. First, the bond wire aging model is established, and the Vce_on is selected as the monitoring parameter. Secondly, taking a three-phase inverter circuit as an example, the Vce_on and Ic waveforms of the IGBT module are monitored in real time, and the process of online monitoring is introduced accordingly. Finally, the experimental results indicate that the method proposed in this paper can accurately identify the aging state of IGBT bond wires under different conditions.

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