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.

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.

유도전동기 고정자자속 기준제어의 최대효율제어

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.

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.

일제강점기 李王家 世襲財産의 종류와 기능

신명호(shin myung ho) 동북아시아문화학회 2016 동북아시아문화학회 국제학술대회 발표자료집 Vol.2016 No.10

during the japanese colonial period, the japanese tenno offered an annual allowance for joseon royal family member. in order to manage this annual allowance, the management rule for basic property was established in 1915. at the same time, the basic property for joseon royal family member was also established in 1915. during the japanese colonial period,, joseon royal family have had the hereditary property. so during the japanese colonial period, the joseon royal family property was formed by basic property and hereditary property. general property was formed by stocks, cashes and loans. the other hand, hereditary property was formed by farmland, fields and woodlands. during the japanese colonial period, the joseon royal family property was managed by the chief of the bureau for joseon royal family member. also supervised by secretary of japanese imperial household agency. in the long run, we can conclude that the japanese colony managed and also supervised the joseon royal family property in order to control joseon royal family member.

『天文類抄』‘雨’ 항목과 『開元占經』 ‘雨占’ 비교연구

신명호(Shin, Myung-Ho) 동북아시아문화학회 2021 동북아시아문화학회 국제학술대회 발표자료집 Vol.2021 No.07

The chunmunryucho(천문류초) written by lee sun-ji(이순지) in the early joseon dynasty represent the Celestial planisphere knowledge and water conception during the joseon dynasty. it was because that The chunmunryucho(천문류초) had astromantic conception and yin-yang and five elements(음양오행) conception also. In the chunmunryucho(천문류초), there were the two constellations which are related to the conception of water creation and water circulation. chon-il(천일) is related to the conception of water creation. the other hand, tae-il(太一) is related to the conception of water circulation such as rain, dew, frost, snow, hail, mist, fog, cloud. tae-il(太一) makes the heavenly energy such as rain, dew, frost, snow, hail fall into earth. also tae-il(太一) makes the earthly energy such as mist, fog, cloud upto heaven. so the heavenly energy and earthly energy circulate between heaven and earth by tae-il(太一) By the comparative Study on the wind(風) of 『chonmunryucho(天文類抄)』 and the the wind foretell(風占) of 『gaewongumkyung(開元占經)』, we can conclude that The chunmunryucho(천문류초) had a integrating conception in water creation and water circulation. but in order to stress yin-yang and five elements(음양오행), the integrating conception of the chunmunryucho(천문류초) gave more important role to yin-yang and five elements(음양오행) than to chon-il(천일) and tae-il(太一).

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.

동기릴럭턴스전동기의 자기포화를 고려한 약계자제어

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 추정 방법

신명호(Myoung Ho Shin),유승우(Seung-Woo Yoo) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4

본 논문에서는 액체추진 로켓엔진을 수리 불가능한 일회 사용 시스템으로 간주하고 고장 없는 작동을 신뢰도 지표로 설정한다. 이 때 고장 없이 작동할 확률에 대한 점 추정치와 신뢰하한이 액체추진 로켓엔진의 신뢰도 지표가 된다. 엔진의 각 컴포넌트가 신뢰성 관점에서 독립적일 뿐 아니라 그 컴포넌트의 작동과 성능을 특징짓는 다수의 요소들로 나누어질 때, 이러한 요소들 전체의 집합을 액체추진 로켓엔진의 신뢰성 구조-기능 모델이라고 한다. 액체추진 로켓엔진의 신뢰도 추정은 엔진과 그 구성품에 대한 신뢰성 구조-기능 모델을 구성하고 분석함을 통해 수행된다. 본 논문에서는 액체추진 로켓엔진이 n개의 구조-기능 요소의 직렬로 구성되었다고 가정할 때, 인증 시험, 수락 시험, 실제 발사 등에서 수행된 엔진 연소를 통해 획득되는 시험데이터에 기반해서 각각의 구조-기능 요소에 대한 점 추정치와 신뢰하한을 추정하여 엔진의 신뢰도 점 추정치와 신뢰하한을 추정하는 방법을 제시한다. 엔진을 구성하는 다섯 가지 유형의 구조-기능 요소에 대해 PFFO 점 추정치와 신뢰하한이 계산된다. In this paper, a liquid rocket engine is considered as non-repairable single use system and the main index of reliability for the engine is failure-free operation. Then PFFO point estimate and lower bound of confidence are reliability indices of the liquid rocket engine. Reliability structural-functional model of engine can be obtained if each component of the engine is divided into the number of elements that are independent from reliability standpoint which characterize operability and performance of the component. Reliability of liquid rocket engine is estimated by forming up and analyzing reliability structural-functional diagram of engine and its components. If liquid rocket engine is composed of a series of n structural-functional elements, then point estimate and lower bound of confidence of the engine can be assessed by estimating the PFFO point estimates and lower bounds of confidence of the n structural-functional elements based on test data. In this paper, PFFO point estimates and lower bounds of confidence for the 5 types of the structural-functional elements of engines are formulized.

한국형발사체 75톤 엔진시스템의 기능구조/고장모드 분석과 신뢰도 모델링

신명호(Myoung Ho Shin),조상연(Sangyeon Cho),김현우(Hyunwoo Kim) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.5

본 논문에서는 한국형발사체의 1단과 2단에 적용되는 75톤 엔진에 대해 기능구조 분석을 수행하고 고장모드를 식별한다. 또한, 그 결과를 바탕으로 엔진의 RBD를 작성한다. 엔진 신뢰도는 LCF cycle 과 HCF time의 조합으로 모델링된다. 각 Weibull 분포의 형상모수와 척도모수는 Crow-AMSAA 신뢰도 성장 모델링을 적용하여 추정한다. This paper performs a structural-functional analysis on the 75-ton engine of KSLV-II and identifies its failure modes. Then, RBD of the 75-ton engine is constructed. The reliability function of 75-ton engine is modeled by a product of LCF cycle Weibull distribution and HCF time Weibull distribution, and the parameters of the Weibull distributions are estimated by Crow-AMSSA reliability growth modeling method.