• Title/Summary/Keyword: 토크 평가

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A Numerical Study on the Automotive Torque Converter(Part I) - Hydraulic Design and Evaluation of Circulation Flow Rate - (자동차용 토크 컨버터의 수치해석적 연구(Part I) - 수력학적 설계와 순환유량의 평가 -)

  • 김홍식;박재인;주원구;조강래
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.5
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    • pp.28-36
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    • 1998
  • In order to establish the hydraulic design process of the torque converter, pump, turbine and stator were designed by reverse design method including one dimensional analysis, angular momentum distribution and forced vortex design. And the significance of evaluation of the circulation flow rate in torus of the torque converter was verified by numerical calculation if the combined blade rows of pump and turbine. It was confirmed that the computational method using interrow mixing model by Park and Cho was reliable to predict the flow-field and performance of the torque converter.

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Evaluation of Torsional Vibration Isolation Damper in Automotive Transmissions Based on In-situ Torque Measurement (토크 측정을 이용한 차량 변속기용 비틀림 진동 절연 댐퍼 평가)

  • Kim, Gi-Woo;Jang, Jae-Duk
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.22 no.4
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    • pp.377-382
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    • 2012
  • This paper presents a proof-of-concept study on the evaluation of torsional vibration isolation performance through in-situ output torque measurement by using a non-contacting magneto-elastic torque transducer installed in the vehicle driveline system. The de-trending processing is first conducted to extract the torsional vibration from the measured driveline output torque. In order to estimate the transmissibility, primary performance indicator of a vibration isolator, the magnitude of transmitted torsional vibration with different frequencies is compared. From the conservative estimation results, the torsional damper built in a lock-up clutch of a torque converter is identified to be a vibration isolator. The evaluation results show that the fluid damping by torque converter outperforms the vibration isolation function of a torsional damper, and the isolation performance needs to be enhanced.

A Study on the Evaluation Technique of Quantified Damage for Powertrain System on Traveled Courses (주행노면에 따른 동력장치의 상대 피로 손상도 평가 기법에 관한 연구)

  • Lee, Sang-Ho;Lee, Jeong-Hwan;Kang, Do-Kyung;Goo, Sang-Hwa
    • Journal of the Korean Society for Precision Engineering
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    • v.24 no.12
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    • pp.74-81
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    • 2007
  • This paper focuses on improvement of the reliability for endurance test to serve military automobiles. The driving loads have been measured by use of the wireless telemetry system for the drive shaft of the 4-wheel drive car. In order to analyze the transmission input torque and engine revolution of loads of the test courses and unpaved road have been made use of the revolution counting and cumulative damage by miner's rule. This paper presents the evaluated result for quantified damage about the test courses and roads.

Evaluation of Torsional Vibration Isolation Performance Using In-situ Driveline Output Torque Measurement (구동 출력 토크 측정을 이용한 비틀림 진동 절연 성능 평가)

  • Kim, Gi-Woo;Jang, Jae-Duk
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2012.04a
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    • pp.382-387
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    • 2012
  • This paper presents a proof-of-concept study on the evaluation of torsional vibration isolation performance through in-situ output torque measurement by using a non-contacting magneto-elastic torque transducer installed in the vehicle driveline system. The de-trending processing is first conducted to extract the torsional vibration from the measured driveline output torque. In order to estimate the transmissibility, primary performance indicator of a vibration isolator, the magnitude of transmitted torsional vibration with different frequencies is compared. From the conservative estimation results, the torsional damper built in a lock-up clutch of a torque converter is identified to be a vibration isolator. The evaluation results show that the fluid damping by torque converter outperforms the vibration isolation function of a torsional damper, and the isolation performance needs to be enhanced.

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Evaluation of Friction Torque for a Turbopump Ball Bearing (터보펌프 볼 베어링의 마찰 토크 평가)

  • Jeon, Seong-Min;Kwak, Hyun-Duck;Kim, Jin-Han
    • Tribology and Lubricants
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    • v.27 no.1
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    • pp.25-33
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    • 2011
  • Rolling contact ball bearings are utilized almost exclusively for liquid propellant rocket engine turbopump. Turbopump ball bearings are required to endure high speed and high load for a poor lubricated condition in cryogenic environment. To evaluate bearing heat generation performance, friction torque is investigated as a function of rotation speed, bearing load and cooling flow rate through an experimental study using water coolants. Radial and axial loads are simultaneously applied to the test bearing by gas pressurized cylinder rod. Endurance performance of bearing has been also verified under the bearing required load for operating condition during total accumulated test time 2,100 sec.

Design and Its Influence Evaluation of Gear System Considering Vibratory Torque (진동토크를 고려한 기어시스템의 설계 및 영향 평가)

  • 이돈출;김지근;김태언;김상환
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2003.11a
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    • pp.316-323
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    • 2003
  • The gear system is commonly applied in the marine propulsion shafting system using the diesel engine with the power take off/in system and it also is necessary to reduce propeller revolution increasing the propulsion efficiency. The diesel engine has the advantage more than other thermal engines in high thermal efficiency and mobility. But the large vibratory torque which induced by higher combustion pressure is transmitted to these gears. In this paper, the surface durability and bending stress of gear system considering vibratory and transient torque is evaluated by ISO and AGMA regulation. And the influence of these in gear design is investigated with the theoretical analysis and onboard measurement result of torsional vibration.

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Speed Controller Design for BLDC Motors Using Robust PID Control (강인 PID 제어를 이용한 BLDC 모터의 속도제어 시스템 설계)

  • Kim, In-Soo;Lee, Young-Jin;Park, Sung-Jun;Park, Han-Woong;Lee, Man-Hyung
    • Proceedings of the KIEE Conference
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    • 2000.07d
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    • pp.2658-2660
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    • 2000
  • 본 논문은 주파수역에서의 모델매칭을 이용하여 강인한 성능의 PID 제어기 튜닝법을 제안하였다. 이를 이용하여 부하토크 외란에도 강인한 성능의 BLDC 모터의 속도제어기를 설계하였다. 부하토크 외란이 존재하여도 주어진 기준명령을 강인하게 추종하도록 $H_{\infty}$ 제어를 이용하여 속도제어기를 설계한 후, 설계할 PID 제어계의 루프 전달함수와 설계된 $H_{\infty}$ 제어계의 루프 전달함수간의 오차가 주파수역에서 최소가 되도록 PID 제어기 파라미터를 튜닝하였다. BLDC 모터의 속도제어 시뮬레이션을 통하여 설계된 강인 PID 제어기의 성능을 평가하였다.

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Development of Hydraulic Testing Machine for Flexible Seal on Solid Rocket Motor (고체모터 플렉시블 씰을 위한 수압시험장치 개발)

  • Kwon, Tae-Hoon;Rho, Tae-Ho;Kim, Byung-Hun;Cho, In-Hyun
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2008.11a
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    • pp.227-230
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    • 2008
  • Movable nozzle with a flexible seal have been used for Thrust Vector Control of the Solid Rocket Motor. The Hydraulic Testing Machine is consisted of Chamber, Actuator, Counterpotentiometer, and evaluates performance of Flexible seal for spring torque and axial compression. The qualification test of Flexible seal was conducted on design condition. A study fix up method of formulation, operation, inspection on Hydraulic testing machine.

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A Study on the Transaural Filter Implementation for 5.1 Channel Speaker System (5.1채널 스피커 시스템에서 트랜스오럴 필터 구현에 관한 연구)

  • 최갑근;방승범;김순협;정완섭
    • The Journal of the Acoustical Society of Korea
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    • v.21 no.3
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    • pp.245-255
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    • 2002
  • This thesis deals a method to deliver more realistic sound by cancelling the cross-talk which is inherent to the 5.1 channel speaker system. The acoustical model for cross-talk cancellation is the free field model. This model minimizes distortion of sound. I used the bark scale sound quality compensation which based on psycho-acoustic. For the surround channels, band-limited sound quality compensation is performed in the frequency domain. I also performed the sound quality assessment test on the traditional 2 channel stereo and 5.1 channel system. This test is performed in the test chamber which satisfies the ITU-R specifications. I uses the IACC (Inter-Aural Cross-Correlation) to determine the preferences of the amateur and the golden ear experts to asses the trans-aural filter. According to the result from the proposed method, I got more the 38 dB separation rates with the Dolby standard speaker array. The results on the diffusion by the subjective test with the experts shows 0.4 point increased then before.

Evaluation Methods of Homogeneity for Feedstocks and Effect of Homogeneity on the Magnetic Properties of Plastic Magnets (플라스틱 자석 혼합물의 균질도 평가방법과 균질도가 자기특성에 미치는 영향)

  • 이석희;최준환;문탁진;정원용
    • Journal of the Korean Magnetics Society
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    • v.8 no.2
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    • pp.86-92
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    • 1998
  • Homegeneous feedstock is necessary to make plastic magents with uniform magnetic properties, therefore the optrimized mixing route and the homogeneity evaluation method are demanded. In this paper, method of homogeneity evaluation and effect of homogeneity on the magnetic prperites were investigated using Sr-ferrite /EVA plastic magnets. The feedstocks with different homogeneity were prepared using batch mixer and single screw extruder. The homogeneities of feedstocks were tested by torgue sensor, capilary rheometer, and measurement of magnetic properties. Mixing torque measurement using torque sensor was an effective method to determine the critical powder loading, but it was nor suitable to suitable to determine the feedstock mixing quality. Particle alignment measurement of a plastic magent was very accurate to evaluate the homogeneity, but expensive equipments were required to make and measure the samples. Pressure measurement using capillary rheometer was a very effective and easy method with high accuracy. Homogeneous feedstock increased the particle alignment of plastic magnet. Remanet flux density and maximum energy product increased linearly and quadratically with increasing particle alignment, respectively.

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