탄도미사일의 비행특성을 고려한 요격미사일 소요 알고리즘

김흥섭,김기태,전건욱,Kim, Heung-Seob,Kim, Ki-Tae,Jeon, Geon-Wook 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.6

A Ballistic Missile(BM) is a missile that follows a sub-orbital ballistic flightpath with the objective of delivering one or more wardheads to a predetermined target and An Anti-Ballistic Missile(ABM) is a missile designed to destroy a ballistic missile before reaching its target. The main objective of this study is to assess the requirement of ABM by considering both flight characteristic of the SCUD-B/C, Nodong missiles and intercept performance of ABM in the Lower tier Ballistic Missile Defense(BMD). The Ballistic Missile's flight characteristics, such as trajectory, velocity etc., are estimated by simulation using the physical motion equations. The requirement of ABM is calculated by evaluating whether the BMD forces can defend those when the ballistic missiles attack prime facilities.

액티브 머플러를 이용한 자동차 배기계의 능동소음제어

김흥섭,홍진석,오재응,Kim, Heung-Seob,Hong, Jin-Seok,Oh, Jae-Eung 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.11

This study experimentally demonstrates the use of active muffler attached to the automotive exhaust system to reduce exhaust noise. For improving the signal to noise ratio in the process of estimation of secondary path transfer functions, the on-line algorithm that conventional inverse modeling is combined with adaptive line enhancer is used as the control algorithm. Active muffler is designed that the primary noise and the control sound are propagated as a plane wave in the outlet. Therefore, the error microphone could be placed out of the tail pipe center of a high temperature and the radiation noise to the outside could be reduced in the whole area around the outlet. The control experiment for reducing exhaust noise with active muffler is implemented during run-up at no load. From the experimental results presented, compared with the conventional off-line method, the proposed on-line method is capable to acquire a reduction of exhaust noise above 5 dB in overall sound power level.

부가경로 전달함수의 온라인 예측에 의한 능동소음제어의 성능 향상

김흥섭,손동구,오재응,Kim, Heung-Seob,Sohn, Dong-Gu,Oh, Jae-Eung 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.2

In the conventional inverse modeling method for on-line modeling of the secondary path transfer function, the signal to noise ratio between the arbitrary random signal and the plant noise have to keep at -10 - -20 dB. For these reasons, the modeling can't be exactly implemented by the conventional method alone and the convergence time for modeling becomes too long. In this study, by combining the conventional inverse modeling method with an adaptive line enhancer, or with an adaptive noise canceller, a rigorous transfer functions of secondary path modeling and the control of a primary noise have been implemented simultaneously.

덕트에서 온라인 적응 알고리듬을 이용한 능동소음제어

김흥섭,홍진석,오재응,Kim, Heung-Seob,Hong, Jin-Seok,Oh, Jae-Eung 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.8

In the case of the transfer function for the secondary path is dependent on time, the on-line method which can model it is continuously must be applied to the active noise control technique. And the adaptive random noise technique among the on-line methods is effective in the narrow-band control. In this method, the signal to noise ratio between random noise for modeling and primary noise is low. Therefore, the estimations of transfer function will be prone to inaccuracies and the convergence time will be too long. Such imperfections will have an influence upon the performance of an active noise controller. In this study, t enhance the signal to noise ratio, the on-line method that is combined the conventional adaptive random noise technique and the adaptive line enhancer, is proposed. By using proposed on-line method, a rigorous system identification and control of primary noise have been implemented.

동기화한 이산화법을 이용한 능동소음제어의 성능향상에 관한 연구

김흥섭,오재응,신준,Kim, Heung-Seob,Oh, Jae-Eung,Shin, Joon 대한기계학회 1994 대한기계학회논문집 Vol.18 No.10

In this paper, active noise control is performed in a duct system using the periodic pulse train which corresponds to the periodic component of noise source as a reference signal. Control algorithm applied in this study is possible to eliminate the acoustic feedback which occurs in the conventional filtered-x and filtered-u LMS algorithm by using electrical reference signal and has the fast adaptation speed with low filter orders by using synchronous sampling method is discussed via computer simulations and experiments of case studies such as frequency modulation, amplitude modulation and frequency differency between source signal and reference signal.

배기소음 제어용 능동형 소음기의 제어 성능평가에 관한 연구

김흥섭,손동구,오재응,Kim, Heung-seob,Shon, Dong-Gu,Oh, Jae-Eung 대한기계학회 1998 大韓機械學會論文集A Vol.22 No.2

Active mufflers have been mainly applied in the large industrial engine due to considerable expense for implementation, but a necessity of development has been increased by the tightened regulation of exhaust noise and the request of high power. In this study, the active muffler prototype for installing in an automobile is designed and constructed. The active muffler is designed so that the primary noise and the control sound are propagated as a plane wave in the outlet. Therefore, the error microphone could be placed outside the high temperature centers of the tail pipe, and the noise radiating to the outside could be reduced in the whole areas around the outlet. For evaluating the control performance of the prototype, the control experiments of band-pass filtered random signal and the modulation of sinusoidal signal which are generated from the primary noise speaker as practical exhaust sound level are implemented. And to investigate the radiation pattern from the outlet of tail pipe and the noise reduction level of points placed adjacent to the outlet, the sound level of adjacent points of thirty is measured.

부가경로 전달함수의 온라인 예측에 의한 능동 소음 제어의 성능 향상

김흥섭(Kim Heung Seob),손동구(Sohn Dong Goo),오재응(Oh Jae-Eung) 한국소음진동공학회 1995 한국소음진동공학회 학술대회논문집 Vol.1995 No.5

모듈형 엔진의 수명관리를 고려한 항공기-임무 할당 모형

김흥섭(Heung seob Kim) 한국생산관리학회 2018 韓國生産管理學會誌 Vol.29 No.2

본 연구는 군의 항공기 운영 목적과 환경에서 항공기 엔진의 수명관리를 고려한 항공기-임무 할당 모형(AMA: Aircraftmission assignment model)을 제안한다. 엔진은 항공기가 근원적 기능을 발휘할 수 있도록 하는 핵심 부품으로, 정해진 수명 동안 사용한 후 재생과정(창정비)을 거쳐 재사용된다. 또한, 엔진의 창정비 기간 중 항공기의 정상적 운영을 위해 예비 엔진을 보유하고 있으며, 예비 엔진의 소요는 창정비 기간과 분산(불확실성)을 고려하여 산정된다. 따라서 창정비 기간의 균일성은 예비 엔진의 소요 감소와 항공기의 안정적 운영에 기여한다. 창정비 기간의 균일성은 엔진의 수명관리를 통해 창정비 입고량과 주기를 균등하게 유지함으로써 향상될 수 있다. 결론적으로, 본 연구의 목적은 원활한 항공작전 수행 여건을 보장하면서 엔진들의 잔여 수명이 수명관리 통제선에 따라 분포될 수 있도록 항공기를 운영하기 위한 의사결정 모형을 제안하는데 있다, 또한, 현실의 항공기 운영환경을 고려하여 수치실험 예제를 개발하고, 수리모형에 의한 임무 할당에 따라 수일 동안 항공작전을 수행하는 시뮬레이션을 통해 본 연구의 적합성과 효과성을 검증하였다. This article proposes an Aircraft-Mission Assignment (AMA) model, considering the operational environments for military aircraft and the conception of aircraft engine lifetime management. The engine is a critical component that enables the airplane to perform its fundamental function, and is used for a specified lifetime and then reused through a renewal process, that is, depot maintenance (DM). Furthermore, the military holds the spare engines for the operation of airplanes during the depot maintenance period of the engines, and the requirement has been computed by considering the mean and uncertainty of the repairing period. Thus, the uniformity of DM times contributes to the reduction of the spare engines and stable operation of the fighters, and it can be enhanced by keeping the amount and time-interval of entered engines uniformly through managing the lifetime consumption of the engines. Consequently, the purpose of this study is to suggest a decision-making model for employing the fighters efficiently so that the residual lifetimes of the engines could be distributed according to a control line established for lifetime management. Moreover, considering the real environments of aircraft operation, an example is developed, and the suitability and effectiveness of this study have been verified by a simulation that the military performs air operations for several days.

인제대학교 고안전차량핵심기술 연구소

김흥섭(Heung Seob Kim) 한국자동차공학회 2010 오토저널 Vol.32 No.1

혼합 중복전략을 고려한 시스템의 신뢰도 최적화 문제

김흥섭(Heung-seob, Kim),전건욱(Geonwook, Jeon) 대한산업공학회 2011 대한산업공학회 추계학술대회논문집 Vol.2011 No.11

Reliability is defined as a probability that a product/service will operate properly for a specified period of time under the design operating conditions without failure and it has been considered as one of the major design parameters in the field of industries. Reliability-Redundancy Optimization Problem(ROP) involves selection of components with multiple choices and redundancy levels for maximizing system reliability with constraints such as cost, weight, etc. However, in practice both active and cold standby redundancies may be used within a particular system design. Therefore, a redundancy strategy (active, cold standby) for each subsystem in order to maximize system reliability is considered in this study. Due to the nature of ROP, i.e. NP-hard problem, Parallel Particle Swarm Optimization(PPSO) technique is proposed to solve the mathmatical programming model and it gives consistently better quality solutions than existing studies for benchmark problem. This study is applied to the Multi-Spectral Camera(MSC) system of ARIRANG-2 Satellite as a actual system. The numerical experimental results of applied exercise are presented as instances of recommended design configurations.