비선형 현가계 모델을 고려한 승용차 타이어의 동특성 해석

박현만(H. M. Park),이동원(D. W. Lee),김찬중(C. J. Kim),김성래(S. R. Kim),이봉현(B. H. Lee),조춘택(C. T. Cho) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4

Road noise is becoming more and more important factor in improving customer satisfaction and is not an easy task because of difficulty of compatibility with various performances such as handling, ride comfort and rolling resistance. Vibration properties of suspension system including tire and wheel have a great effect on the vehicle interior noise. Therefore, it is necessary for tire developers to get a knowledge how tire is coupled with suspension in the specific frequency range. Finite element models considering a tire and suspension system have been generally constructed by using spring, damper and concentrated mass elements for the numerical analysis in the low frequency ranges. In this study, the assembly of tire/wheel and suspension system was fully modeled by using continuum elements in order to analyze the coupled dynamic characteristics up to the middle frequency ranges. This finite element model considering the relationship between tire/wheel and suspension system seems to make it effective to predict their dynamic characteristics.

음향진동 연성 모델을 이용한 흡음재 부착형 타이어의 공명음 해석

박현만(Hyunman Park),나재봉(Jaebong Na),노국희(Guckhee Rho),조춘택(Chuntaek Cho) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

재구성 가능형 마이크로 공작기계의 구조 창성설계 방법

최영휴(Y. H. Choi),박현만(H. M. Park),장성현(S. H. Jang),박종권(J. K. Park) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-

This paper proposes a new method to generate feasible machine tool configurations of Modular-Reconfigurable Machine Tool in the preliminary design stage. Proposed method includes the constructing configurations and its machining ability check. Our method defines module posture vector for each module and mutual connectivity coefficient matrix for adjacent two modules. All of machine configurations possible to be generated from any two combined modules can be determined by quadratic form of two associated posture vectors. Furthermore, all of possible machine tool configurations generating from a series of multiple modules also can be obtained by multiplying quadratic form of two adjacent posture vectors consecutively. To construct the feasible machine configurations using given modules, we defined geometric constructing rules in consideration of the functions and configurations of each module. And, to select the useful machine configurations, we checked the machining ability using the directivity between tool and cutting plane for all the generated machine configurations. Finally, we applied proposed method to generating configuration problem of 3-axes milling machine using 7 modules(spindle table, bed, column, 3-translational slides).

북한의 『WMD 확산 차단』 연구

김재엽(Kim, Jae-yeop),박현만(Park, Hyun-man),이종응(Lee, Jong-eung) 한국전략문제연구소 2018 전략연구 Vol.25 No.3

북한은 "18년 4월 27일 제1차 남북정상회담 이후 ‘풍계리 핵실험장 폐기’ 선언을 하고 꼭 한 달 뒤인 "18년 5월 26일 제2차 남북정상회담 이후 남북 관계에 평화의 바람이 부는 듯하다. 하지만 지난 "17년에 6차 핵실험을 실시했으며, 핵탄두를 장착한 여러 종류의 핵미사일의 실전배치를 목전에 두고 있는 것으로 추정하고 있다. 또한 화학 및 생물학무기와 WMD를 투발할 수 있는 1,000여기의 전략·전술 미사일을 보유하고 있는 것 또한 사실이다. 이처럼 현재 북한의 WMD 위협은 한반도 전역을 위한 군사작전과 나아가 전 세계와 동북아 평화유지를 위해 반드시 제거되어야 할 장애물이다. 이에 한·미 당국은 북한의 WMD 문제와 관련하여 다양한 방법으로 대응책을 모색하고 있다. 한국은 천안함 사건 이후 PSI 전면참여를 결정하고 "10년 10월 13~14일 부산 앞 남해상 일대에서 15개 주요국이 참가한 가운데 최초 한국 주도의 연합 PSI 훈련을 실시하였다. 이는 한국이 북한의 WMD 확산 및 제 3국으로의 유출을 국제공조를 통해 공식적으로 차단하겠다는 의지를 천명한 것이며, 동시에 북한의 WMD에 대한 한·미의 확고한 군사적 대응의지를 보여 주는 것으로 풀이된다. 또한 우리 군은 북한의 WMD 위협에 대응하기 위해 작전계획 발전, 한·미 연합훈련 실시, 작전수행절차 연구 등의 노력을 실시하고 있다. 하지만 WMD대응과 관련하여 WMD 제거작전 위주로 발전이 되어 『WMD 확산 차단』을 수행해 하는데 어려움이 따르고 있다. 이에 『WMD 확산 차단』에 대한 개념을 정립하고 작전 단계별 수행개념을 제시해 차후 『WMD 확산 차단』을 연구시 개략적인 방향을 제시하고, 임무수행을 위한 여건을 보장하고자 한다. Pyeongyang has conducted the sixth nuclear test in 2017, and it is estimated that several missiles equipped with nuclear warhead are on the verge of deployment. It also has 1,000 strategic and tactical missiles capable of delivering chemical and biological weapons and WMDs. Thus, the current WMD threats of north Korea is a obstacle that must be eliminated not only for military action purpose in the entire korean peninsula but also for the preservation of peace in Northeast Asia. Accordingly, South Korean and U.S. authorities have been looking for countermeasures in various ways related to north Korea"s WMD issues. South Korea decided to participate in the PSI after the Cheonan incident and conducted the first South Korean-led combined PSI training on October 13 and 14, 2010 with 15 major countries participating in the southern sea in front of Busan. The action can be seen as South Korea"s declaration of willingness to officially block north Korea"s WMD outflow to third countries and proliferation through international cooperation, and at the same time this demonstrate that Seoul"s and Washington"s willingness to take firm military action against Pyeongyang"s WMDs. Furthermore, our military is making various efforts such as developing operational plans, conducting combined exercise with U.S., researching operational procedures, and so forth to counter against north Korea"s WMD threats. However, there are some difficulties remained in implementing "the interdiction of WMD proliferation" since the countermeasures for WMD has been mostly focused around the WMD elimination operations. Therefore, I would like to set up the concept of "the interdiction of WMD proliferation" and suggest operational concept for each operational level so that following studies on "the interdiction of WMD proliferation" can be provided with a rough direction and a condition for mission performance.

재구성 가능형 모듈러 마이크로 공작기계의 구조형태 창성방법에 관한 연구

최영휴(Y. H. Choi),박현만(H. M. Park),장성현(S. H. Jang),박종권(J. K. Park) 한국생산제조학회 2005 한국공작기계학회 추계학술대회논문집 Vol.2005 No.-

This study describes a new method of constructing reconfigurable machine tool configuration from a set of modules or components. Our method defines module posture vector for each module and mutual connectivity coefficient matrix for adjacent two modules. All of machine configurations possible to be generated from any two combined modules can be determined by quadratic form of two associated posture vectors. Furthermore, all of possible RMT configurations generating from a series of multiple modules also can be obtained by multiplying quadratic form of two adjacent posture vectors consecutively. Finally, machining functionality is checked for all the generated machine confirgurations, and useful machine configurations can be selected.

정상 상태 롤링 해석 기법 적용을 통한 타이어 패턴 형상에 따른 PRAT 특성 연구

성기득(Kideug Sung),박현만(Hyunman Park),구병국(Byongkook Koo),조춘택(Choontack Cho) 한국자동차공학회 2008 한국 자동차공학회논문집 Vol.16 No.5

알고리즘전을 향한 경쟁 : 중국의 체계대항과 미국의 시스템전 분석

도응조(Do Eungjo),이기성(Lee Gisung),박현만(Park Hyunman) 한국전략문제연구소 2021 전략연구 Vol.28 No.3

본 논문의 목적은 최근 중국과 미국이 연구하고 있는 체계대항과 시스템전을 설명하고 비교하면서 우리 군이 우선 얻을 수 있는 시사점을 제시한다. 중국의 체계대항과 미국의 시스템전 개념은 군사력을 시스템 복합시스템으로 분석하면서 자신의 시스템을 보호하고 상대의 시스템을 파괴하기 위한 것으로, 이 두 전쟁수행개념은 모두 AI를 이용한 알고리즘전 수행을 추구한다고 주장한다. 미래에 알고리즘전은 필연적이라고 본다. 따라서 AI 기계학습을 위해 데이터는 결정적으로 중요하며, 빅데이터는 막대한 양의 데이터 세트들의 집합이므로 한국군은 AI 개발을 위해 우선 분야별 데이터 세트 구축을 반드시 선행해야 한다고 강조한다. 아울러 시스템 복합시스템을 기초로 적 위협 분석을 하고 AI를 활용하여 상황변화와 적위협에 대항하여 더 빠르게 대응하며 적응적이고 융통성 있게 변형할 수 있는 조직을 만들어야 한다고 본다. 하지만 미래에 AI 알고리즘전을 수행하더라도 인간의 전투의지, 수단으로서의 전쟁, 그리고 안개, 마찰과 같은 요소를 무시하면 위험하다고 결론 내린다. The purpose of this essay is to explain and compare the China’s system confrontation and the USA’s systems warfare they are developing, and to suggest some critical implications for Korea military. The China’s warfighting concept pertaining to system confrontations and the USA’s warfighting concept to systems warfare analyze a military entity as system of systems and they try to protect their systems and destroy opposing systems. The former is based on the NCW concept to actualize its concept for victory, the system destruction warfare. The latter is based on the decision-centric warfare theory and created the mosaic warfare theory to actualize it. Also, this essay asserts that all of them pursue the algorithmic warfare using AI. It strongly insists that the algorithmic warfare is inevitable in the near future. Because big data means larger and more complex data sets and data sets are very important to AI/ML(machine learning), it enunciates that the Korea military must prioritize making data sets in each field and sector in order to develop relevant AI. Also, it suggests that Korea military needs to shift a threat analysis from the order of battle one to system of systems one and have very transformable organizations. In this perspective, if the Korea military uses AI capabilities properly, it can decide more fast than the opposing systems and transform military organizations into very improvisatory and adaptable forms based on situational changes. However, in the AI algorithmic warfare, it argues that the nature of war as political means will be relevant, the human will to fight be critical, and the fog and frictions in war exist. It concludes that disregarding the nature of war, any military organizations face a danger.

3D 패턴드 타이어에 대한 정상 상태 롤링 해석 기법 적용

성기득(Kideug Sung),김성래(Sungrae Kim),박현만(Hyunman Park),김남균(Namkyun Kim),손창억(Changeuk Son),조춘택(Choontack Cho) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

The steady state rolling analysis method in relation to tire analysis has been often used for the research of tire rolling performance because of the efficiency of computation time. But, this has a limit that meshes in the section have to be the same along the circumferential direction, so can not consider 3D pattern. That is, as above reason, this has been used for performance research in relation to only tire structure factors without 3D pattern until now. However, from now, it is possible to analyze in consideration of 3D pattern due to F.E. code development recently. So, in this study, we have examined the application of rolling performance research of 3D patterned tire using steady state rolling analysis implementing ABAQUS Release 6.6. We have analyzed the PRAT in relation to vehicle pull, cornering stiffness in relation to steering response, the footprint shape and F&M in the cornering state, and compared with test results.

휠 하중 가진 기반 1/4 차량 모델의 방사소음 해석

김찬중(Chanjung Kim),권성진(Sungjin Kwon),이봉현(Bonghyun Lee),박현만(Hyunman Park),성기득(Kideug Sung),조춘택(Chuntaek Cho) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4

The nature of acoustic radiation is responsible for tire vendors as one of promising performances directly related to the driver's comfortability in a vehicle system and thereby, the accurate prediction of the acoustic radiation is required during the development of tire system. Even though the prediction technology of acoustic radiation itself is reliable using proven softwares, the prediction of a tire system under developing process is hard to guarantee since the dynamic interaction between the tire and suspension module could not be considered sufficiently owing to the suspension module is not constructed as a mature model. In this paper, the dynamic effect of a suspension module over a tire system is investigated to verify that the quarter-car model can provide the more accurate acoustic prediction than that case of tire model alone. The acoustic radiation analysis is performed for two finite element models of the tire system, with and without a suspension model, using a wheel force transducer data on a proving ground. The characteristics of acoustic result according to the special events of proving ground is addressed at physical perspectives and it concludes that the reliable prediction of a tire system can be expected only in case the dynamics of suspension module is included.

모듈러 RMT의 구조형태 생성을 위한 새로운 방법

최영휴,박현만,장성현,최응영,김인수,박종권 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-

This study describes a new method of constructing Reconfigurable machine tools configurations from a set of modules or components. This proposed method defines combinability vector for each module and mutual combinability coefficient matrix for adjacent two modules. All of machine configurations possible to be generated from any two adjacent modules can be determined by quadratic form of two associated combinability vectors. Furthermore, all of possible RMT configurations generating from a series of multiple modules also can be obtained by multiplying quadratic form of two adjacent conbinability vectors recursively. Our proposed RMT configuration generating method can be successfully applied to determining all of possible machine configurations from several modules or components at conceptual- or preliminary- design stage.