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우주발사체 개발사업에서 신뢰성공학의 시스템엔지니어링 인터페이스
신명호,조상연,조미옥,Shin, Myoung Ho,Cho, Sang Yeon,Joh, Miok 한국시스템엔지니어링학회 2006 시스템엔지니어링학술지 Vol.2 No.1
Development of launch vehicle needs a large-scale and complicated System Engineering discipline interfacing to small-quantity production with special manufacturing processes. In general, the System Engineering discipline of launch vehicle has its relationship with Production, Operations, Product Assurance and Management disciplines and its internal partitions into the functions of System Engineering Integration & Control, Requirements Engineering, Analysis, Design and Configuration and Verification. As a function of Product Assurance, reliability of launch vehicle plays an significant role in risk management, system safety, flight safety and launch certification through design assurance. Moreover, major functions of systems engineering are integrated by means of reliability in the phases of design and verification. Therefore, derailed identification of system engineering interfaces of reliability, and execution of tasks for reliability assurance is required for successful development of launch vehicle. This paper identifies specific pattern and mechanism of the interfaces between reliability and system engineering.
신명호,Shin, Myoung-Ho 한국조명전기설비학회 2006 조명·전기설비학회논문지 Vol.20 No.4
입력이 최소가 되는 자속의 값을 찾는 유도전동기 고정자자속기준제어의 최대효율제어방법을 제안한다. 제안한 방법에서, 정해진 자속의 값만큼씩 기준자속의 값을 변화시키면서 직류링크에서 측정된 입력의 값이 최소가 되는 기준자속의 값을 찾는다. 또한 철손저항을 고려한 유도전동기의 모델을 이용하여 철손저항을 고려한 토크, 슬립각 속도, 비간섭 보상전류식을 사용한다. 시뮬레이션 및 실험결과를 통해서 제안한 방법의 효과를 입증한다. Maximum efficiency control scheme in a stator flux-oriented induction motor drive is proposed for minimizing input dc power. Flux level is decreased in steps for searching the minimum input dc power. In addition, Torque equation, slip angular frequency, and decoupling compensation current considering iron loss resistance is used. Simulation and experimental results verify the effectiveness of the proposed method.
유도전동기 고정자자속 기준제어의 최대효율제어에서 부하증가로 인한 문제 해결방법
신명호,Shin, Myoung-Ho 한국조명전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.3
Flux level is low in the maximum efficiency control of a stator flux-oriented control of induction motor under the light load. In this cast if the loaf torque is suddenly increased, torque component current is limited to the low level by torque-limit condition because of the low flux level. In this paper, a technique to solve the problem is proposed. 유도전동기 고정자자속 기준제어의 최대효율제어에서 경부하시 자속은 작은 값이 된다. 이러한 상태에서 갑자기 부하가 증가하였을 경우 전동기는 부하토크에 대응하는 토크를 발생시켜야 하지만, 낮은 자속 때문에 토크제한조건에 의한 토크성분전류는 작은 값으로 제한되며, 부하토크에 대응하는 토크를 발생시키지 못해서 속도제어가 안 되는 문제가 발생한다. 본 논문에서는 이러한 문제를 해결하기 위한 방법을 제안한다.
신명호(Myoung-Ho Shin) 한국조명·전기설비학회 2017 조명·전기설비학회논문지 Vol.31 No.10
Conventional field weakening control considering magnetic saturation in a 3-phase synchronous motor drive has not presented a clear calculation method for base speed. In this paper, a calculation method for the base speed considering the magnetic one is presented. The base speed is calculated using maximum torque control method. It is shown that the improved speed response is achieved by the proposed method being compared to that of the conventional method. In addition, it is shown that voltage limit curve with magnetic saturation does not become ellipse while the one without magnetic saturation becomes ellipse. The proposed method is verified by simulation results.
액체추진 로켓엔진 신뢰도 추정을 위한 신뢰성 구조-기능 방법
신명호(Myoung Ho Shin),유승우(Seung-Woo Yoo) 대한기계학회 2022 大韓機械學會論文集A Vol.46 No.2
본 논문에서는 연소시험 성공여부를 바탕으로 연소시간과 점화횟수 데이터에 기반하여 이항 모델을 적용하는 기존의 액체추진 로켓엔진의 신뢰도 추정 방식을 개선하고, 엔진과 구성품에 대한 사전 데이터, 개발시험, 샘플링 검사, 이송 전 점검, 비행시험 등의 과정에서 획득한 다양한 정보와 데이터를 활용하기 위한 방법으로, 우크라이나 유즈노예 설계국의 신뢰성 구조-기능 방법을 도입하고, 75톤 액체추진 로켓엔진의 신뢰성 구조-기능 요소의 주요 분포인 정규분포, 이항분포, 지수분포, Weibull 분포, 하중-강성 분포에 대해 신뢰도 점 추정치와 신뢰하한을 근사화하여 계산하는 공식을 발견하고 증명한다. The reliability structural-functional method of the Ukrainian Yuzhnoye Design Bureau is introduced to improve the existing reliability estimation methods of liquid-propelled rocket engines that apply binomial distribution based on the combustion time and ignition frequency data and utilize various information and data obtained from preliminary data, development tests, sampling inspections, pre-shipment inspections, and flight tests of the engine and its components. The formulas for calculating the reliability point estimates and lower confidence limits for the main distributions of the reliability structural-functional elements of the 75-ton liquid-propelled rocket engine, such as normal distribution, binomial distribution, exponential distribution, Weibull distribution, and load-strength distribution, are determined and proved.
저분해능 위치센서를 갖는 영구자석 동기전동기의 칼만필터를 적용한 속도제어
신명호(Myoung-Ho Shin) 한국조명·전기설비학회 2016 조명·전기설비학회논문지 Vol.30 No.12
This paper presents an improved speed control of surface-mounted permanent magnet synchronous motor(SPMSM) using Kalman Filter algorithm. Rotor position is detected by a low resolution position sensor of 3 hall position sensors at every 60 electrical degrees. The detected outputs of 3 hall position sensors are inputted to Kalman Filter algorithm. Then rotor speed and position are estimated using Kalman Filter algorithm. Simulation results show that the speed control of conventional method which speed and position are directly calculated using the outputs of 3 hall position sensors can not be achieved under load torque of 2N.m in low speed region, whereas the speed control in low speed region under load torque of 2N.m can be achieved by the proposed method.
일정토크영역에서 유도전동기 고정자자속기준제어의 파라미터 비동조 영향 분석
신명호(Myoung-Ho Shin) 한국조명·전기설비학회 2012 조명·전기설비학회논문지 Vol.26 No.11
It is well known that the stator-flux-oriented induction motor drives are not dependent on parameter detuning in constant torque region except low speed range. This paper presents parameter detuning effects of stator-flux-oriented induction motor drives in constant torque region. The detuning effects of stator resistance, rotor resistance and rotor leakage inductance are analyzed.
신명호(Myoung-Ho Shin) 한국조명·전기설비학회 2013 조명·전기설비학회논문지 Vol.27 No.1
It is well known that the maximum torque of a 3-phase induction motor does not vary as the resistance of rotor varies by proportional shifting. However, proportional shifting is derived using simplified equivalent circuit of induction motor. Therefore, there are some errors in the torque characteristics shown in the text book. This paper presents the torque characteristics using not simplified equivalent circuit but equivalent circuit. Errors produced by simplified equivalent circuit are presented.
신명호(Myoung-Ho Shin) 한국조명·전기설비학회 2015 조명·전기설비학회논문지 Vol.29 No.9
This paper presents a current sensorless maximum torque control of a synchronous reluctance motor drive. Stator current and current angle vs. maximum torque are obtained using measured d-axis and q-axis inductances. Then, d and q-axis stator voltage references for current sensorless maximum torque control are calculated from stator voltage equations. The proposed method is verified by simulation results comparing with conventional method.
신명호(Myoung-Ho Shin) 한국조명·전기설비학회 2018 조명·전기설비학회논문지 Vol.32 No.5
A 3-phase squirrel cage induction motor is widely used as generator that is analyzed using equivalent circuit of an induction motor. In conventional analyses, an equivalent circuit not considering iron loss is used. However, the analysis not considering iron loss produces errors in analysis results. In this paper, various characteristics of a 3-phase squirrel cage induction generator considering iron loss are analyzed. Errors due to neglect of iron loss in variables such as input, output, slip, torque, and efficiency are presented. In addition, rated values of generator considering the rated current of motor are presented and errors not considering iron loss at rated condition are investigated.