• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 1990년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 26-27 Oct. 1990
• /
• pp.681-686
• /
• 1990

The existing Swash Plate Type Axial Piston Motor rapidly drops efficiency at high speed in comparison with low speed. This is the reason why the motor was designed only in a viewpoint of minimum of power supply. But, in this paper, the motor which was optimally designed in a veiwpoint not only power supply but also load capacitancy, flow loss volume, axial stiffness and tilting stiffness keeps up high efficiency at high speed.

• 로봇학회논문지
• /
• 제5권3호
• /
• pp.216-223
• /
• 2010

Most lamp units at ceilings, walls, and streets are static and no automatic motion capabilities are available at all to adjust lamp tilting angles and its zooming position. This paper proposes a new robotic lamp that creates three degrees of freedom (DOF) motion by using a spherical-type parallel mechanism with a unique forward kinematic position. In the robotic lamp, three motors are placed at the base frame to control two tilting angles and one zoom in-and-out motion for a localized light. The kinematic model of this device is derived and the proto type has been developed. The performance of this device was verified through experiment.

• 열병합발전
• /
• 통권50호
• /
• pp.18-22
• /
• 2006

The tilting pad journal bearing has widely used to support high pressure/high rotating turbine rotors owing to their inherent dynamic stability characteristics. However, fatigue damages in the upper unlcaded pads and the break of locking pins etc. by pad spragging were continuously taken place in the actual steam turbines. The purpose of this paper is to develope a new bearing model that can prevent bearing damage problem effectively by pad spragging in a tilting pad journal bearing. A new bearing model which has a wedged groove is suggested from the studies of spragging mechanism performed by previously research works. The spragging characteristics of the upper unloaded pad are studied experimentally in order to verify the reliability of a new bearing model. It can be known that the phenomenon of pad spragging nearly does not occur in the new bearing model under the various experimental conditions. And it is observed that any kinds of bearing failures by pad spragging does not detect in the application of actual steam turbines.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2006년도 추계학술대회 논문집
• /
• pp.593-594
• /
• 2006

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2008년도 춘계학술대회 논문집
• /
• pp.2151-2155
• /
• 2008

The tilting train express (TTX) is able to tilt its body toward to the center of the turning radius on curved railways. TTX can travel at higher speed than the existing normal railway vehicles due to the tilting mechanism decreasing centrifugal force. Also, a new suspension system is required for TTX which has proper stiffness constants and damping ratios because it has different suspension characteristics with the others. Therefore, the suspension systems need to be optimized to maximize dynamic characteristic of the railway vehicle. To optimize the dynamic characteristics of TTX, sensitivity analysis should be onde to identify design variables. In this paper, Design of Experiments(DOE) is used for the sensitivity analysis of TTX.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2005년도 추계학술대회 논문집
• /
• pp.131-139
• /
• 2005

It is very difficult to analyze the dynamic characteristic because tilting vehicle is a very complex system which are connected various mass element with tilting system. To realize and analyze actual phenomenon has restriction that usual commercial software calculates creep force under creep theory about wheel -rail contact mechanism as basic analyzing, and approach about contact point are based on two dimensional non-linear contact theory and simplified Hertzian contact which considers just displacement change on the YZ plain. Therefore, to solve these problems there should be a new approach difference with existing one. In this research, a new algorithm for finding wheel-rail contact position, calculation method of contact force and applied force will be presented.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2005년도 춘계학술대회 논문집
• /
• pp.796-805
• /
• 2005

The tilting pad journal bearings have been widely used to support high pressure/high rotating turbine rotors owing to their inherent dynamic stability characteristics. However, fatigue damages in the upper unloaded pads and the break of locking pins etc. by pad fluttering are continuously taken place in the actual steam turbines. The purpose of this paper is to develop a new bearing model that can prevent bearing problems effectively by pad fluttering in a tilting pad journal bearing. A new bearing model which has a wedged groove is suggested from the studies of fluttering mechanism performed by previously research works. The fluttering characteristics of the upper unloaded pad are studied experimentally in order to verify the reliability of a new bearing model. It can be known that the phenomenon of pad fluttering nearly does not occurred in the new bearing model under the various experimental conditions. And it is observed that any kinds of bearing failures by pad fluttering does not detect in the application of acture steam turbines.

• 한국유체기계학회 논문집
• /
• 제8권5호
• /
• pp.35-45
• /
• 2005

The tilting pad journal bearings have been widely used to support high pressure/high rotating turbine rotors owing to their inherent dynamic stability characteristics. However, fatigue damages in the upper unloaded pads and the break of locking pins etc. by pad fluttering are continuously taken place in the actual steam turbines. The purpose of this paper is to develop a new bearing model that can prevent bearing problems effectively by pad fluttering in a tilting pad journal bearing. A new bearing model which has a wedged groove is suggested from the studies of fluttering mechanism performed by previously research works. The fluttering characteristics of the upper unloaded pad are studied experimentally in order to verify the reliability of a new bearing model. It can be known that the phenomenon of pad fluttering nearly does not occurred in the new bearing model under the various experimental conditions. And it is observed that any kinds of bearing failures by pad fluttering does not detect in the application of acture steam turbines.

• 한국철도학회논문집
• /
• 제12권5호
• /
• pp.700-706
• /
• 2009

고속철도 개통 후 고속철도 혜택을 받지 못하는 지역의 형평성을 고려하고, 철도와 타 교통수단간의 경쟁력 증진을 위해 기존 철도의 속도 향상이 필요한 것이 틸팅열차 기술개발의 원동력이 되었다고 볼 수 있다. 틸팅열차는 곡선부를 주행할 때 원심력을 줄이기 위해서 열차를 곡선부 안쪽으로 약간 기울이는 것을 의미하는데, 실제로 틸팅열차는 승객의 승차감을 향상시키면서 결과적으로 속도 향상의 효과를 기대할 수 있다. 이에 틸팅열차를 이용한 기존선의 속도향상에 대한 많은 연구가 추진되어 왔으며, 우리나라와 같이 노선에 곡선부가 많은 경우 곡선통과 속도를 향상시켜 노선의 운행시간을 단축시키고 평균속도를 향상하는데 상당히 효과적일 수 있다. 본 논문의 목적은 이렇게 효과적인 수단으로 인식되는 틸팅열차의 운행에 따른 새로운 편익 및 효과의 정량차 방안을 연구하고자 하는 것이며, 이를 위해서는 기존 틸텅열차 연구시 계량화가 가능했던 편익이외에 추가적인 편익항목의 정량적 정성적 분석과정을 도출하고자 한다.

• 한국정밀공학회지
• /
• 제18권5호
• /
• pp.84-89
• /
• 2001

The alignment of the rollers carrying the web is found to be one of important factors to the lateral behavior of the moving web and to the quality of the final web products. But, the perfect alignment of the rollers is not always possible and the web itself can be cambered. Thus the control of lateral behavior of the moving web is critical in the most of web handling systems. The web guiding system that adjusts the angle of the alignment between two adjacent rollers is commonly used in industry. But, in this paper a new web guiding system is proposed by using the lateral dynamics of the moving web induced by a tilted roller in normal direction of a web. The computer simulation study was carried out to verify the steering performance of the suggested guiding system. Computer simulation study shows that the performance of the new guiding mechanism is better than that of an existing guiding mechanism.