• 드라이브 ㆍ 컨트롤
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• 제19권3호
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• pp.39-46
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• 2022

In South Korea, to evaluate the rollover safety of domestic vehicles, the maximum slope angle of the vehicle is specified, which is verified by the rollover safety test of driving vehicles. However, the domestic rollover safety test is not suitable for buses, because the small amount of static stability factor (SSF) will invalidate the rollover experimental equation due to the high center of mass position of buses. To solve the above problems, a dynamic model of the bus is prepared with assumptions of mass and suspension spring properties. Subsequently, the maximum slope angle of the model was computed by using the simulation of multi-body dynamics, and the result was compared with actual test results to validate the dynamics model. Also, the rollover Fishhook (roll stability) test was conducted in the simulation for driving model. During the simulation, roll angle and roll rate were calculated to check if a rollover occurred. Through the rollover simulation of buses, the domestically regulated formula for rollover safety and the procedure of rollover test for driving vehicles are evaluated. The conclusion is that the present regulation of rollover test should be reconsidered for buses to ensure to get the valid results for rollover safety.

• 드라이브 ㆍ 컨트롤
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• 제20권4호
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• pp.9-16
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• 2023

This paper analyzed a drainage tower used to drain water in flooded areas. Multi-body dynamics simulation was used to analyze the dynamic behavior of the drainage tower. Structural analysis, flexible-body dynamic analysis, and rigid body dynamic analysis were done to study the maximum Von-Mises stress of the drainage tower. The results showed that the maximum Von-Mises stress occurs at the turn table, and it decreases when the angle of the boom is increased. Also, the rate of the change of angle affects the maximum stress so that the maximum stress changes more when the angular velocity of the boom increases. Based on the rigid body dynamic analysis and the theoretical analysis results, the centrifugal force from the angular velocity makes the difference in the maximum stress at the turn table because of the difference in their direction. Consequently, it was concluded that the centrifugal force should be considered when designing construction machinerythat can rotate.

• 과학과기술
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• 통권531호
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• pp.64-69
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• 2013

• 대한기계학회논문집A
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• 제34권3호
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• pp.361-367
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• 2010

3 차원 캠의 하나인 배럴캠은 자동화 생산 기계에서 인덱스 드라이브 유닛의 부품으로 많이 사용된다. 캠의 회전축과 종동절의 회전축이 90 도의 위상으로 직교한다. 인덱스 드라이브는 일정한 속도로 회전하는 캠의 입력에 대해 회전하고 정지한다. 터렛이 배럴캠의 회전에 의해 작동하는 동안 종이컵이 매우 빠르고 정확하게 성형된다. 그러나, 배럴캠과 종동절사이의 지속적인 미끄럼 접촉에 의해 점착마모가 발생하며 이러한 마모는 시스템의 성능에 영향을 준다. 결과적으로 제품의 불량율을 증가시킨다. 본 연구에서는 종이컵 성형기에 사용되는 배럴캠의 마모에 영향을 주는 인자가 접촉력임을 확인한다. 배럴캠과 롤러 사이의 접촉력은 다물체 동역학 모델을 이용해 계산한다. 그리고 해석 결과와 실제 시스템의 마모부와 비교를 통해 중요 마모 인자가 접촉력임을 검증한다.

• 한국항공우주학회지
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• 제50권10호
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• pp.691-699
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• 2022

본 논문에서는 대형 메쉬 안테나 개발을 위한 모듈식 전개형 반사판 및 붐 구조의 전개 시 요구되는 구동력 및 전개 특성을 분석하고자 한다. 단위 전개 구조를 이용하여 모듈식 전개형 반사판 링과 붐 구조의 수납/전개된 형상을 분석하였다. Kane's 방정식을 이용하여 전개 구조물의 다물체 동역학 방정식을 유도하고 PUTD(Pseudo Upper Triangular Decomposition) 방법을 적용하여 구속조건 문제를 해결하였다. 다물체 동역학 시뮬레이션을 통해 설계된 모듈식 전개 반사판 링 그리고 붐 구조의 동적 특성을 살펴보고자 한다.

• 한국해양환경ㆍ에너지학회지
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• 제16권4호
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• pp.239-247
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• 2013

최근 화석연료의 고갈과 환경오염으로 인하여 해상풍력에너지와 같은 신재생 에너지에 대한 관심이 높아지고 있다. 본 연구에서는 범용 동역학해석 프로그램인 MSC.ADAMS를 이용하여 공력하중 및 전기 발전기 토오크를 결정하기 위한 테브난(Thevenin) 방정식이 고려된 해상풍력발전기의 다물체 동역학 해석 기법을 검토하였다. 해석대상으로 고려한 시스템은 5MW급 해상풍력발전기이며, 3개의 블레이드가 수평축 방향에서 역풍을 받아 전기를 생산하는 수평축 풍력발전 형태이다. 블레이드에 작용하는 공력하중은 블레이드 요소 모멘텀 이론을 기반으로 일반화된 동적 웨이크를 고려할 수 있도록 개발된 AeroDyn 프로그램으로부터 산출하였다. 해상풍력발전기의 주요 연결부에서의 동적하중과 토오크 특성이 실제 현상과 유사하게 산출될 수 있도록 하기 위하여, 다물체 동역학 모델 상에 블레이드와 타워는 실제 구조 특성치를 고려한 유연체 모델링을 적용하였다.

• 한국생산제조학회지
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• 제21권5호
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• pp.691-696
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• 2012

In this study, a rigid multi-body dynamic model has been developed for mechatronic analysis to evaluate dynamic behavior of a machine tool. The development environment was the commercialized analysis tool, ADAMS, for rigid multi-body dynamic analysis. A simplified servo control logic was implemented in the tool using its functions in order to negate any external tool of control definition. The advantage of the internal implementation includes convenience of the analysis process by saving time and efforts. Application of this development to a machine tool helps to evaluate its dynamic behavior against feeding its component, to calculate the motor torque, and to optimize parameters of the control logic.

• 소음진동
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• 제8권1호
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• pp.203-211
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• 1998

In order to find out relationship between hit probability and gun firing of a moving tank, a turret and flexible gun system model has been developed using a recursive flexible multibody dynamics. For a firing simulation model, nodal coordinates for a finite element model of a flexible gun have been employed to include transverse loads to the gun tube due to moving bullet and ballistic pressure. Modal coordinates are also used to represent the motion induced gun vibration before a firing occurs. An efficient switching technique from modal equations to nodal equation has been introduced for an entire gun firing simulation with a rotating turret.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.865-869
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• 2008

Juryeonggu is a Cuboctahedral die that had used in ancient Korea. This Cuboctahedral is consisted of different two penal servitudes of 14 facepieces, but the probability distribution can appear equally so it can be usable as a die. In this paper, achieved research study about probability of a Cuboctahedral die that have quadrilateral and triangle preferentially to search Juryeonggu's probability calculation method. First, confirmed probability distribution through Multibody-dynamics analysis and verified probability distribution through several experiments. Finally, with this simulation data, achieved theoretical analysis about Cuboctahedral die occurrence probability by using the residual momentum energy.

• 연구논문집
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• 통권32호
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• pp.95-102
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• 2002

An Internet-based dynamic analysis system, called P-DYN, for multibody dynamic systems is developed. All the interfaces of the system are accessible via Web browsers, such as Netscape or Explorer. The system uses a template type P-DYN/Modeler as a preprocessor. The P-DYN postprocessor composed of P-DYN/Plotter and P-DYN/Animator is developed in JAVA. The P-DYN/Solver for predicting the dynamic behavior is run on the server. Anyone who wants to analyze the dynamics of multibody systems or share results data can access the analysis system over the Internet regardless of their OS, platform, or location.