• 제목/요약/키워드: Torque Optimization

검색결과 338건 처리시간 0.037초

차량용 MR 홴 클러치 설계 및 제어 (Design and Control of MR Fan Clutch for Automotive Application)

  • 김은석;손정우;최승복
    • 한국소음진동공학회논문집
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    • 제19권8호
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    • pp.795-801
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    • 2009
  • This paper presents an optimal design of a magnetorheological(MR) fan clutch based on finite element analysis and also presents torque control of engine cooling fan using a sliding mode control. The MR fan clutch is constrained in a specific volume and the optimization problem identifies the geometric dimension of the fan clutch that minimizes an objective function. The objective function for the optimization problem is determined based on the solution of the magnetic circuit of the initially designed clutch. Under consideration of spatial limitation, design parameters are optimally determined using finite element analysis. After describing the configuration of the MR fan clutch, the viscous torque and controllable torque are obtained on the basis of the Bingham model of MR fluid. Then, a sliding mode controller is designed to control the torque of the fan clutch according to engine room temperature and control performance is evaluated through computer simulation.

차량용 MR 팬 클러치 설계 및 제어 (Design and Control of MR Fan Clutch for Automotive Application)

  • 김은석;손정우;최승복
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2009년도 춘계학술대회 논문집
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    • pp.633-638
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    • 2009
  • This paper presents an optimal design of a magnetorheological(MR) fan clutch based on finite element analysis and also presents torque control of engine cooling fan using a sliding mode control. The MR fan clutch is constrained in a specific volume and the optimization problem identifies the geometric dimension of the fan clutch that minimizes an objective function. The objective function for the optimization problem is determined based on the solution of the magnetic circuit of the initially designed clutch. Under consideration of spatial limitation, design parameters are optimally determined using finite element analysis. After describing the configuration of the MR fan clutch, the viscous torque and controllable torque are obtained on the basis of the Bingham model of MR fluid. Then, a sliding mode controller is designed to control the torque of the fan clutch according to engine room temperature and control performance is evaluated through computer simulation.

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차량진동 및 Rotor 내구특성을 고려한 Brake System 의 최적설계 (Optimal Design of Brake System considering Vehicle Vibration and Durability of Rotor)

  • 김봉수;김희열;김강욱;손영균;이동근;박관흠
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2001년도 춘계학술대회논문집A
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    • pp.764-769
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    • 2001
  • Brake-induced vibrations of a vehicle such as brake judder are determined by the excitation of brake torque variations and by their transfer to the driver's contact points via suspension, body and steering system. The formation of brake torque variation is mainly determined by static and dynamic disk thickness variations. The vibration transfer from the excitation by brake torque variation to the perception by the driver depends on the kinematic and dynamic behaviour of the components in the transfer path. Optimization of the judder performance can be achieved either by minimizing the excitation or by reduction of the judder sensitivity of the vehicle. In this paper, the optimization process of a front rotor is suggested to reduce brake judder considering the cooling performance of the rotor, the judder sensitivity of the vehicle and durability of the rotor.

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클러치 동적 토크 계측에 관한 연구 (A Study on Measuring Clutch Dynamic Torque)

  • 이성구;김동영;허만대
    • 한국자동차공학회논문집
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    • 제20권5호
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    • pp.65-70
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    • 2012
  • Torque fluctuation of engine generate gear rattle noise of transmission and many researches have been studied to decrease rattle noise by adjusting clutch damper system. So design optimization of clutch system is very important to decrease rattle noise and need knowing clutch dynamic torque at real vehicle driving condition. This makes it possible to measure clutch dynamic torque by using a small-size magnetic sensor. We install a small-size magnetic sensor on the input shaft of the transmission and measure the relative angular displacement between clutch hub and disc plate. We can obtain the clutch torque correspond to the angular displacement in the clutch torsional characteristics test. The object of this research is to measure clutch dynamic torque on real vehicle condition. Therefore, Clutch dynamic torque is very useful for investigating operating range of clutch according to engine torque and predicting the damping performance of torsional vibration on the powertrain.

FEM을 이용한 Micro-Electromagnetic Clutch 토크와 응답시간해석 (Study on Torque and Engaging time Analysis of Micro-Electromagnetic Clutch by Using FEM)

  • 박창호;김명구;이흥식;조종두
    • 한국전산구조공학회논문집
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    • 제18권1호
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    • pp.21-28
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    • 2005
  • 본 논문에서는 유한요소법을 활용하여 소형전자기클러치(micro-electromagnetic clutch)에서 발생하는 마찰토크와 응답시간을 해석하였다. 소형전자기클러치의 설계변경과 최적화를 위하여 전자석클러치에서 자기장에 의하여 발생하는 전달토크와 응답시간을 정확하게 예측 할 것이 요구된다. 해석을 위하여 전자기장 이론을 기반으로 소형전자기클러치의 축대칭 모델을 구성하고 실제 재료 물성치를 대입하여 토크와 응답시간을 해석하고 유한요소 해석결과의 정확성을 검증하기 위하여 실험결과와 비교하였다. 토크와 응답시간의 해석결과는 실험데이터와 거의 일치하다는 것을 통하여 해석적 방법으로 토크와 응답시간을 예측할 수 있음을 확인 할 수 있다.

유한요소 해석 기반 자동차 공조용 DC모터 토크 리플과 소음 저감에 관한 연구 (FEA-based Torque Ripple and Noise Reduction of DC Motor for Automotive Air-Conditioning)

  • 황명환;김동현;양승진;차현록;한종호
    • 전기학회논문지
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    • 제66권12호
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    • pp.1895-1898
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    • 2017
  • This paper discusses methods for the torque ripple and noise reduction of DC motors for automotive air-conditioning based on electromagnetic field analysis. The target of the motor is a blower motor, and to reduce cogging torque and the torque ripple, the optimum model was selected by deforming the brush or commutator shape. In addition, to reduce the cogging torque, the model design was carried out by applying the skew method and the magnetization method of a magnet to the rotor. For optimization, the shape, material, and drive system of the motor were selected using an electromagnetic field as the analysis tool, and the method of reducing the cogging torque was applied to 4-pole, 12- and 13-slot motors considering the mechanical part. Lastly, this paper confirmed thatthemethod, which proposed how much noise, cogging torque, and vibration are reduced, improves through practical analysis.

A Study on the Detent Torque Reduction of Claw Pole Permanent Magnet Type Motor

  • Jung, Dae-Sung;Lee, Ju;Lee, Sang-Taek
    • 조명전기설비학회논문지
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    • 제27권12호
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    • pp.125-132
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    • 2013
  • This paper has done a three-dimensional FEM analysis of the PM claw pole stepping motor. As magnetization happens in the z-axis, which does not have a constant value, three-dimensional FEM analysis is necessary for characteristic analysis of PM claw pole stepping motors. Because it is a type of permanent magnet motor, the PM claw pole stepping motor naturally has a detent torque. This torque is known to show negative effects on motor performance. To improve motor performance, reducing the detent torque is very important during the motor design. This paper applied DOE for optimization of stator pole design of the motor. Also, we compared motor performance by applying a different type of rotor shape, dividing the permanent magnet. To verify the simulation results, an experiment was done.

Impact control of redundant manipulators using null-space dynamucs

  • Chung, W.J.;Choi, S.L.;kim, I.H.;Chung, G.J.
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1994년도 Proceedings of the Korea Automatic Control Conference, 9th (KACC) ; Taejeon, Korea; 17-20 Oct. 1994
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    • pp.89-94
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    • 1994
  • This paper presents an impact control algorithm for reducing the potentially damaging effects by interation of redundant manipulators with their environments. In the. proposed control algorithm, the redundancy is resolved at the torque level by locally minimizing joint torque, subject to tire operational space dynamic formulation which maps tire joint torque set into the operational forces. For a given pre-impact velocity of the manipulator, the proposed approach is on generating joint space trajectories throughout the motion near the contact which instantaneously minimize the impulsive force which is a scalar function of manipulator's configurations. This is done by using the null space dynamics which does not affect the motion of an end-effector. The comparative evaluation of the proposed algorithm with a local torque optimization algorithm without reducing impact is performed by computer simulation. The simulation results illustrate the effectiveness of the algorithm in reducing both the effects of impact and large torque requirements.

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래틀 진동을 위한 설계 기법 연구 (A Study on the Design Technique to Reduce the Rattle Vibration)

  • 안병민;장일도;홍동표;정태진
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1997년도 춘계학술대회 논문집
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    • pp.562-566
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    • 1997
  • The main torsional vibration source of the driveline is the fluctuation of the engine torque. The gear rattle is impacts generating in the backlash of the free gear due to this torsional vibration Optimization of the clutch torsional characteristic is one of the effective methods to reduce the idle gear rattle. Many researches have been reported on this problem but only few of them give sufficient consideration to the full clutch design parameters(stiffness, hysteresis torque, preload, first stage length) and drag torque This paper pays attention to the gear impact mechanism, clutch design parameters and drag torque to reduce the idle gear rattle with computer simulation.

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