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소티-표적 기반의 공군탄약소요 산정 소프트웨어 개선에 대한 연구
김재철(부교수) ( Jaechul Kim(associate Professor) ) 공군사관학교 2015 군사과학논집 Vol.66 No.1
본 논문은 2011년도에 개발한 공군탄약소요 산정 알고리즘과 소프트웨어의 한계였던 소티당 1개표적만을 공격가능토록 모의하였던 점을 개선한 것이다. 실제 작전상황과 유사하도록, 1개 소티당최대 무장을 장착하고, 복수개의 표적을 공격하게 함으로써 전쟁초기에 소모되는 탄약소요량을 실질적으로 산출되게 하였다. 이를 통해 표적파괴 효과는 20%가 증가하였고, 정밀유도무기의 소요량은 6~82%가 증가하였다. 또한 소프트웨어 기능 측면에서도 전쟁수행단계별로 표적별 추천무장을 달리할 수 있게 하였으며, 전쟁단계 및 전쟁일수와 같은 각종 고정변수들을 가변적으로 변경할 수 있도록 구현함으로써, 실제 전쟁 상황과 같이 최대한 유동적으로 모의될 수 있도록 개선하였다. 또한 신규 항공기 및 무장체계의 추가와 삭제가 자유롭도록 개선하였으며, 소프트웨어 운용을 위한 사용자 편의성을 증가시켰다. 아울러, 자동반복모의(1~50회) 기능을 추가하고 반복실행결과에 대한 통계값을 제공함으로써, 시뮬레이션을 통해 산출된 소요량의 신뢰성을 향상시키도록 구현하였다. The main goal of this effort is to improve the algorithm and user interface of the K-2011 developed in the year 2011. Over the years, it was known that the K-2011 had a significant limitation in that it could not simulate multiple air-to-surface attacks for one sortie. In this paper, we modified the algorithm to attack multiple targets through single sortie. As a result, it was shown that the modified model can reflect the reality of warfare by the increased number of required ammunition and destroyed targets. Required ammunition of PGM(Precision Guided Munition) and destroyed targets are increased by 20% and 6~82%, respectively. Furthermore, the flexibility of war simulations was improved by allowing the alternation of ammunition through the stages of war. The convenience of adding newly developed or imported aircraft or ammunitions was also increased by providing the consistency checking function. Also the automatic iteration function, a new function added by this work, can provide statistic insight of simulation results to the user.
소티-표적 기반의 공군탄약소요 산정 소프트웨어 개선에 대한 연구
김재철(부교수) ( Jaechul Kim(associate Professor) ) 공군사관학교 2015 空士論文集 Vol.66 No.1
The main goal of this effort is to improve the algorithm and user interface of the K-2011 developed in the year 2011. Over the years, it was known that the K-2011 had a significant limitation in that it could not simulate multiple air-to-surface attacks for one sortie. In this paper, we modified the algorithm to attack multiple targets through single sortie. As a result, it was shown that the modified model can reflect the reality of warfare by the increased number of required ammunition and destroyed targets. Required ammunition of PGM(Precision Guided Munition) and destroyed targets are increased by 20% and 6~82%, respectively. Furthermore, the flexibility of war simulations was improved by allowing the alternation of ammunition through the stages of war. The convenience of adding newly developed or imported aircraft or ammunitions was also increased by providing the consistency checking function. Also the automatic iteration function, a new function added by this work, can provide statistic insight of simulation results to the user.
축소 모델 실험장치를 이용한 철도 스킬소음의 특성에 대한 실험적 연구
김지용(Jiyong Kim),황동현(Donghyeon Hwang),이준헌(Junheon Lee),김관주(Kwanju Kim),김재철(Jaechul Kim) 한국소음진동공학회 2015 한국소음진동공학회 논문집 Vol.25 No.5
Squeal noise is a harsh, high-pitched sound that occurs when railways are running at sharp curve tracks. The cause of squeal noise is known to be the transient lateral traction force between wheel and rail. Field measurements are too difficult to control the parameters. Thus, the scaled test rig should have been made in order to investigate the generating mechanism of squeal noise. The unique feature of our test rig, HSTR(Hongik Squeal Testing Rig), is that DOFs of its wheelset are as close to as those of the real railway. The attack angle and running speed of the rail roller are controlled in real time for simulating a transient characteristic of driving curve. The environment conditions, such as given axle load, running speed, and wheels yaw angle have been identified for generating squeal noise and the squeal noise itself has been measured. The relation between wheel creepage and creep force in lateral direction and the criteria for squeal noise have been investigated, which results has been verified by finite element method.
HSTR(Hongik Squeal Test Rig) 이용한 스킬 소음의 실험적 특성 연구
김지용(Jiyong Kim),황동현(Donghyeon Hwang),이준헌(Junheon Kim),김관주(Kwanju Kim),김재철(Jaechul Kim) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
Squeal is a harsh noise of the high-frequency range occurring at the sharp curve tracks. The noise generates while lateral traction force excites the wheel and the rail. Field measurements are difficult to control the parameters and the contact force. Thus, we have made the scaled test rig. The unique feature of our test rig is that wheelset’s movement is similar to that of the railway, as real as possible. The left and right rail roller can be controlled independently for realization of difference of left and right speed at the curved rail. The attack angle and rail roller speed are controlled in real time for simulating a transient characteristic of the driving curve. the contact force between the wheel and the rail are measured by the stain-gage mounted on the rail roller. The relation between creepage and creep force and the criteria for squeal noise have been investigated.
김지용(Jiyong Kim),황동현(Donghyeon Hwang),이준헌(Junheon Lee),김관주(Kwanju Kim),김재철(Jaechul Kim) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
스킬 소음은 급격한 곡선 부분에서 발생하는 듣기 싫은 고주파수 영역의 소음을 말한다. 이러한 소음은 차륜과 레일간 횡 방향 접촉력이 차륜, 레일을 가진 하면서 발생한다. 실제 차량에서는 접촉력과 관련 인자들을 제어하기 어려움이 있으므로, 스킬소음 축소 실험장치를 제작하였다. 제작한 실험 차륜은 가능한 실지 차량과 유사한 동특성을 갖도록 좌우 차륜을 가지고 있으며, 좌우 레일 롤러를 독립적으로 제어하여 곡선부에서의좌우 속도 차를 구현 가능토록 하였다. 또한 곡선구간 주행 시의 과도 특성을 나타낼 수 있도록 구동각 및 구동속도를 실시간으로 제어가능하다. 레일 롤러에 장착된 스트레인게이지를 이용하여, 차륜과 레일 사이의 접촉력을 측정한다. 여러 인자가 접촉력과 스킬소음을 발생시키는데 미치는 영향을 살펴보고자 한다. Squeal is a harsh noise of the high-frequency range occurring at the sharp curve tracks. The noise generates while lateral traction force excites the wheel and the rail. Field measurements are difficult to control the parameters and the contact force. Thus, we have made the scaled test rig. The unique feature of our test rig is that wheelset’s movement is similar to that of the railway, as real as possible. The left and right rail roller can be controlled independently for realization of difference of left and right speed at the curved rail. The attack angle and rail roller speed are controlled in real time for simulating a transient characteristic of the driving curve. the contact force between the wheel and the rail are measured by the stain-gage mounted on the rail roller. The relation between creepage and creep force and the criteria for squeal noise have been investigated.