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339 results on '"Park, Minwon"'

8. Design of an Improved Remaining Useful Life Prediction Model Based on Vibration Signals of Wind Turbine Rotating Components.

Author

Le, Thi-Tinh, Lee, Seok-Ju, Dinh, Minh-Chau, and Park, Minwon

Subjects
REMAINING useful life, WIND turbines, PREDICTION models, PRINCIPAL components analysis, WIND power, MAINTENANCE costs
Abstract

Faults in wind turbine rotating components contribute significantly to malfunctions and downtime. A prevalent strategy to reduce the Cost of Energy (CoE) in wind energy production focuses on minimizing maintenance expenses associated with these turbine components. An accurate Remaining Useful Life (RUL) diagnosis of these components is crucial for maintenance planning, ensuring uninterrupted energy quality and cost-efficiency. This paper introduces a refined method for RUL prediction of wind turbine rotating components using a Health Index (HI) derived from vibration signals. Performing HI construction by extracting all features from the vibration signal and selecting the best features to build HIs using on Principal Component Analysis (PCA) and some abnormal areas that deviate from the bearing damage trend can be eliminated. After constructing a HI use the similarity model and degradation models to predict RUL. Research results show that this degradation method can provide a reliable means to predict the RUL of wind turbine rotating components based on vibration signals. More importantly, predicting RUL in this way can significantly reduce operating and maintenance costs by providing wind turbine rotating operators with sufficient advance notice to plan repairs or replacements before any component failure occurs. [ABSTRACT FROM AUTHOR]

Published
2024
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14. Performance Analysis of a Multimission Missile Launcher With Varying Projectile Weight Based on Multistage Induction Coilgun

Author

Song, Myung-Geun, Park, Sang-Won, Le, Dinh-Vuong, Go, Byeong-Soo, and Park, Minwon

Abstract

We designed a four-stage induction coilgun to launch a 1000-kg projectile. Although the coilgun system is optimized for launching a 1000-kg projectile, it is also capable of launching various lighter projectiles. In this article, we present an algorithm for optimizing the launch of a multipurpose missile with varying weights. We also analyze the performance of our coilgun system and evaluate the results of the algorithm using a simulation model. The algorithm is established using two types of Taguchi methods: LARGER-THE-BETTER and NOMINAL-THE-BEST. The charged voltage of the capacitor and the ignition position for each stage are considered as factors in the Taguchi method. While high efficiency is achieved by every stage except the first, the number of stages is minimized to ensure the simplification of the control system. This algorithm identifies the optimal conditions for achieving high efficiency, regardless of the weight of the projectile. The numerical simulation results demonstrate the effectiveness of the algorithm and the induction coilgun system for use in a multipurpose missile launcher.

Published
2023
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44. Comparative Analysis of XLPE and Thermoplastic Insulation-Based HVDC Power Cables.

Author

Lee, Jae-In, Jeong, Woo-Hee, Dinh, Minh-Chau, Yu, In-Keun, and Park, Minwon

Subjects
CABLES, FINITE element method, INSULATING materials, VOLTAGE-frequency converters, ELECTRIC fields
Abstract

The application of cross-linked polyethylene (XLPE) cables to voltage sourced converter (VSC)-based high voltage direct current (HVDC) systems has already been technically verified and has become common, and thermoplastic (TP) is attracting attention as an insulation material for next-generation cables due to the recent development of material-related technologies. However, studies related to TP cables are mainly focused on improving material properties, and studies related to cable systems are insufficient. In this paper, XLPE and TP cables were designed for application to VSC-based HVDC systems, and major characteristics such as electric field distribution and thermal stability were compared and analyzed through overvoltage simulation. The insulation design method of HVDC cable was presented, and the design was performed using XLPE and TP insulation materials. The temperature and electric field profiles of the cables were also analyzed through a finite element method simulation. To analyze the performance of the designed cable, it was simulated with the PSCAD/EMTDC program. Based on the simulation results, the major characteristics of XLPE and TP cables were compared and analyzed. Results showed that in the case of TP cables, insulation properties were excellent, but thermal conductivity was relatively low; therefore, countermeasures are needed. [ABSTRACT FROM AUTHOR]

Published
2023
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