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전동차 출입문 신뢰성 향상을 위한 BLDC 전동기 위치제어에 관한 연구
문병민,오효석,전승표,최용은,장진영,김재문 대한전기학회 2024 전기학회논문지 Vol.73 No.7
In this study, we conducted a study aimed at replacing the DC motor, which drives the electric doors of EMU, with a BLDC (Brushless DC) motor. The existing DC motor has contact parts such as brushes and a commutator, which require regular maintenance due to wear caused by rotational contact. This results in decreased motor efficiency, impedes normal door opening and closing operations, and affects the operational lifespan of the drive unit. To overcome these issues and enhance the door system's performance, we propose the adoption of BLDC motors. BLDC motors operate without brushes and a commutator, reducing friction-related heat issues and lowering the probability of malfunctions. They enable stable door operations even with lower power consumption and allow precise control of position and speed using hall sensors. We developed a prototype BLDC motor door hardware based on the existing electric door profile. The motor speed and panel position were controlled through the Hall sensor of the BLDC motor. Additionally, various conditions were experimented based on the existing door speed profile to verify the reliability of the BLDC motor door position control.
문병민,이진욱,김남호,최창선,김재일,배석주,Mun, Byeong Min,Lee, Chinuk,Kim, Nam-ho,Choi, Chang-Sun,Kim, Zaeill,Bae, Suk Joo 한국군사과학기술학회 2017 한국군사과학기술학회지 Vol.20 No.2
To generate mechanical movements in one-shot devices such as missiles and space launch vehicles, pyrotechnic mechanical device(PMD) such as pin pullers using pyrotechnic charge has been widely used. Reliability prediction of pin pullers is crucial to successfully execute target missions for the one-shot devices. Because the pin pullers require destructive tests to evaluate their reliability, one would need about 3,000 samples of success to guarantee a reliability of 99.9 % with a confidence level of 95 %. This paper suggests the application of a probit model using the charge amount as a functional parameter for estimation of functional reliability of pin puller. To guarantee target reliability, we propose estimation methods of the lower bound of functional reliability by applying the probit model. Given lower bound of functional reliability, we quantitatively show that the optimum amount of charge increases as the number of samples decreases. Along with a variety of simulations the validity of our new model via real test results is confirmed.
Condition monitoring scheme via one-class support vector machine and multivariate control charts
문병민,임문원,배석주 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.10
A condition-based maintenance (CBM) has been widely employed to reduce maintenance cost by predicting the health status of many complex systems in prognostics and health management (PHM) framework. Recently, multivariate control charts used in statistical process control (SPC) have been actively introduced as monitoring technology. In this paper, we propose a condition monitoring scheme to monitor the health status of the system of interest. In our condition monitoring scheme, we first define reference data set using one-class support vector machine (OC-SVM) to construct the control limit of multivariate control charts in phase I. Then, parametric control chart or non-parametric control chart is selected according to the results from multivariate normality tests. The proposed condition monitoring scheme is applied to sensor data of two anemometers to evaluate the performance of fault detection power.
Pyrotechnic Mechanical Device(PMD) 오링에 대한 가속노화시험 데이터 모델링
문병민,이진욱,배석주,장승교,류병태 한국신뢰성학회 2018 한국신뢰성학회 학술대회논문집 Vol.2018 No.5
Pyrotechnic Mechanical Device (PMD)는 화약에서 발생하는 에너지를 정교한 기계 동작 에너지로 변화시키는 장치이며, 인공위성 및 우주발사체에 널리 사용되고 있다. 오링은 PMD의 주요 구성품으로 PMD 내부에서 발생되는 압력의 누설을 방지하며, 오링의 기밀 성능에 따라 PMD의 수명이 좌우된다. 본 논문에서는 PMD의 오링에 대한 가속노화시험 데이터에 대한 모델링 및 분석방법을 제안한다. 오링의 수명을 추정하기 위하여 2단계 접근법 (2-stage approach) 및 ADT 접근법 (accelerated degradation test approach)을 적용하였으며, 실제 오링 데이터에 적용하여 그 결과를 비교·분석하였다.