대공포 포탑의 냉방유동개선 연구

이동희(Dong Hyi Lee),황부일(Bu Il Hwang),김치환(Chi Hwan Kim) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11

Combat vehicle needs to have air-conditioning unit although new combat systems have a tendency to apply on the integrated system about heating, cooling and ventilating. The specification of air conditioning unit depended on combat vehicle’s purpose of use. It is difficult to send cooing air from air conditioning unit to a gun turret through the drum basket. Because the gun turret is rotating and consists of closed anti-aircraft shell magazine. In this study we studied air conditioning unit for armored combat vehicle as a special use and military specification and tried to improve air-conditioning unit performance although the gun turret is rotating and could apply more improved unit for our combat vehicle due to analysis and test of this study for flow improvement compared to the previous model.

화력과 기동의 통합성능을 고려한 미래 전투차량의 해석 기반 설계 프레임웍 연구

임성훈(Sunghoon Lim),임우철(Woochul Lim),민승재(Seungjae Min),이태희(Tae Hee Lee),류재봉(Jae Bong Ryoo),변재정(Jai-Jeong Pyun) (사)한국CDE학회 2014 한국CDE학회 논문집 Vol.19 No.4

This paper proposes the 3D modeling and simulation technique for predicting the integrated performance of combat vehicle. To consider the practical driving and firing condition of a combat vehicle, the full vehicle model, which can define the six degrees-of-freedom of vehicle motion and various firing angles, is developed. The critical design parameters such as the stiffness and damping coefficient of suspension system are applied to construct the analysis model of vehicle. A simple ballistic model, which incorporates the empirical interior ballistic model and the point mass trajectory model, is built to estimate the firing range and the firing recoil force. To predict the integrated performance and analyze the effect of system parameters, MATLAB/SIMULINK model of a combat vehicle for performing the real time simulation is also developed. Several simulation tests incorporating the road bump and the firing recoil force are presented to confirm the effectiveness of the proposed vehicle model.

장갑차량용 자가발전 냉방시스템의 최적화 설계

이부환(Boo-Hwan Lee),김영운(Young-Un Kim),윤서욱(Seo-Uk Yoon) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.10

Combat Vehicle needs to have Self-Powered Air-Conditioning Unit although new combat systems have a tendency to apply an integrated system about heating, cooling and ventilating. A Self Powered air conditioning unit has lots of advantages that keep the cooled environmental in vehicle without using the main power. In this study we studied Diesel Powered Air Conditioning Unit for Armored Combat Vehicle as a special use and military specification and tried to do a case study that applies to one of the unique military combat vehicles. By using Fluent 5.3 we tried to find proper air ducting method and its location in the armored combat vehicle. When we need to upgrade our vehicle with a small modification of previous system, we should choose to the most effective model of them which we can select. The results show that Self-Powered Air-conditioning Unit gives one of the best solutions to the previous vehicles which haven't equipped with cooling unit for their crews.

화력성능개선을 위한 명중률에 관한 연구

강환일(Hwan Il Kang),김현수(Hyun Soo Kim) (사)한국CDE학회 2015 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2015 No.하계

We consider some factors affecting hit probability for ground combat vehicle. Some factors result in some deviations off the center of the target in the vertical direction and other factors result in the deviation off the center of the target in the horizontal direction. Major factors affecting hit probability consist of platform errors which come from the road unevenness. Due to road unevenness, vertical displacement, pitch variation and roll variation occur. These errors result in major degradation of hit probability. By simulation, we obtain three variations for the combat vehicle and calculate the hit probability of the combat vehicle due to three variations. When the combat vehicle passes through the speed bump, we calculate the stabilization time for the combat vehicle. The proposed prediction of hit probability will be a good tool for optimal design of the combat vehicle associated with firepower performance.

무인전투기 물리적 전투력 분석

민승식,오경원 항공우주시스템공학회 2017 항공우주시스템공학회지 Vol.11 No.6

본 논문은 란체스터 방정식을 이용하여 우리의 무인전투기(블루군)과 적 무인전투기(레드군) 간의 교전 결과를 예측하였다. 란체스터 법칙은 군단의 전력이 전투원 수에 비례한다는 제1법칙(linear law)과전투원 수의 제곱에 비례한다는 제2법칙(square law)가 있다. 제1법칙은 게릴라전에 적합한 법칙이고 제2 법칙은 전면전에 적합한 법칙으로 알려져 있으며 일반적으로 제2법칙이 많이 쓰인다. 란체스터의 제2법칙을 이용하여 교전 결과를 예측하였다. 교전에서 승리하기 위한 전투손실률 값은 물론 필요 전력수를추산하였고, 우리 군의 피해를 1대 미만으로 만들기 위한 전력수도 예측하였다. 적 무인전투기와 아군무인전투기의 전투 대수가 같을 경우 승리를 보장받으려면 전투손실률이 1:1.5 이상이 되어야 한다. The objective of this study was to use the Lanchester equation to predict the outcome of our engagement between our unmanned aerial vehicle (UAV) (Blue Group) and enemy UAV (Red Group). Lanchester's law states that the power of corps is proportional to the number of combatants. A second law states that the power of corps is proportional to the square of the number of combatants. The first law is a suitable law for guerrilla warfare while the second law is known as the law suitable for all-out war. Therefore, the second law is commonly used. The second law of Lanchester's was used in this study to predict engagement results. We estimated the battle loss rate value to win the battle as well as the required power number. We also predicted power number to make the damage of our group less than one. The battle loss rate to reliably receive victory when the enemy's UAV and the ally’s UAV are equal in number of combat units must be 1: 1.5 or more.

노이즈 제거를 통한 전투 장갑차량 자동소화장치 오작동 현상 개선

김록한,김세영,이하연 한국기계기술학회 2023 한국기계기술학회지 Vol.25 No.5

Combat-armored vehicles were equipped with an automatic-fire-extinguishing system to ensure the safety of the crew and vehicle from fires on the vehicle. When a fire was occurred, the automatic-fire-extinguishing system automatically detects the fire through sensors and detection lines, sprays a fire extinguisher, and notifies the crew visually and audibly. Recently, there had been cases of automatic-fire-extinguishing systems malfunction on combat-armored vehicles. In this study, in order to resolve the automatic-fire-extinguisher's malfunction phenomenon, ground noise and inter-circuit noise generated from the fire detection line were identified, and the resistance connected on the circuit was revised to remove noise. As a result of resistance revision, the noises was eliminated and the electromotive force difference between input circuits was made constant, thereby improving the malfunction of the automatic-fire-extinguishing system. By applying the result, it was confirmed that the control device sensed a temperature similar to the actual temperature on actual vehicles, and it was confirmed that the automatic-fire-extinguishing system's malfunction phenomenon was not founded in the field vehicles after then.

전투차량 용접구조물의 변형 개선 및 교정방안에 관한 연구

나라별,김선진,정연호,강승주,김록한,손민구 한국기계기술학회 2021 한국기계기술학회지 Vol.23 No.5

Combat vehicles were developed in two types depending on the purpose of operation. The body of the vehicle is relatively large welded structure, and there is a quality problem in that welding deformation occurs in a certain area. Welding deformation is a problem that is inevitably generated during the welding process, and additional corrective work is performed. However, due to the structural characteristics of the welded structure of combat vehicl, there are many limitations in the correction method, which lowered the productivity. To improve this problem, we intend to establish improvement measures through analysis of the areas where welding deformation occurs and apply corrective measures suitable for welding structures of combat vehicles. For the design improvement plans, the finite element analysis were used and the correction method were applied to simulated structure to confirm the possibility. Finally, the improvement effect was confirmed by manufacturing the actual welded structure. Based on the results of this study, it is expected that the productivity of related similar welding structures as well as structures of wheeled armored vehicles, can be improved.

고온 환경에서의 전투차량용 BLDC 모터 신뢰성 향상에 관한 연구

윤효진(Hyo-Jin Yoon),남윤욱(Yoon-Wook Nam),박경식(Kyoung-Sik Park) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.5

Combat vehicles require high levels of maneuverability, firepower, armor, and operability. A high-performance power system is required for optimal maneuverability. The fuel pump which supplies fuel stably is very important to achieve this. The fuel pump consists of a pump part, a motor part, and a control part. It is equipped with a BLDC motor. Numerous failures of the fuel pump occurred during vehicle operation when exposed to vibration, shock, and high temperature. The cause of failure was confirmed to be stator slip of the BLDC motor. Stator slip is a consequence of the interference loss between the stator and the housing of the motor part in an high temperature environment. The failure of the fuel pump was solved through size control of the motor housing and the stator. We performed vibration testing at high temperature for verification. This study contributes to improving the reliability of combat vehicles.

전투차량용 계기판 조립체 내부 표면의 결로 저감을 위한 후속공정 개발에 관한 연구

김건태,김병현,주용원,윤준호,남윤욱 한국기계기술학회 2024 한국기계기술학회지 Vol.26 No.4

The condensation phenomenon can affect the product in terms of function and aesthetics, so it is a complaint of many users from the past, and continuous research has been conducted to solve it. A portable instrument panel is installed inside combat vehicles such as tanks and armored vehicles. Due to the nature of the combat vehicle operated in the special situation of battle, the internal heat generation of the instrument panel has increased significantly, which is presumed to be the cause of condensation inside the instrument panel. In this paper, a study on the development of subsequent processes was conducted to reduce the condensation phenomenon of the instrument panel for combat vehicles. In order to reduce the condensation phenomenon, the experiment was carried out by setting baking time and stabilization time as major factors. This paper is considered to be a reference research data for all systems in which similar assemblies are used as well as instrument panels for combat vehicles.

Design of an aerial combat guidance law using virtual pursuit point concept

You, Dong-Il,Shim, David Hyunchul Professional Engineering Publishing Ltd 2015 Proceedings of the Institution of Mechanical Engin Vol. No.

<P>In this paper, a combat maneuvering guidance law for an unmanned combat aerial vehicle is presented, and X-Plane based nonlinear six-degrees-of-freedom combat simulation results are presented. For realizing practical implementation and good real-time performance, the guidance law is designed using the virtual pursuit point concept and a typical pure pursuit guidance law. The virtual pursuit points, which include virtual lag, pure, and lead points, are generated based on energy–maneuverability analysis for turn performance, weapon characteristics, and basic fighter maneuver principles of manned fighters. Furthermore, an algorithm is proposed for generating a single point using the virtual pursuit points and for determining the type of pursuit maneuver using the vehicle’s state-based probabilistic functions. The simulation results indicate that the proposed guidance law produces sensible maneuvers for close air-to-air engagement. The proposed methodology has the advantage of not only allowing wide-ranging combat maneuvers from high-g agile to delicate gunshot maneuvers but also performing tactical pursuit maneuvers in real time using the virtual pursuit point.</P>