• Title/Summary/Keyword: Window Regulator

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The Development of Evaluation Process for Dynamic Characteristics of Door Module (자동차용 모듈화 도어의 동특성 평가 시험법 개발)

  • Bae, Chul-Yong;Kim, Chan-Jung;Kwon, Seong-Jin;Lee, Bong-Hyun;Jang, Woon-Sung;Lee, Joon-Woo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.11a
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    • pp.291-296
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    • 2007
  • This study presents the evaluation process for door module. Its objective evades the resonance generated at module plate due to the operation of window regulator motor. For this study, the design improvement process is composed of experimental methods having three steps. First step is modal analysis at door assembly status for acquisition of dynamic characteristics which are modal frequency and damping. Second step is a vibration experiment to get the test mode considered an efficiency of window regulator motor. Last step is a vibration measurement by the form of $6{\times}6$ array on module plate. A vibration measurement of 6x6 array form can be got to three analysis results which are a transfer path of vibration using cross correlation function, a vibration map using OA level and a contribution by frequency band using coherent output power spectrum on module plate. These results are applied to SDM(structural dynamic modification) for design improvement to get around the resonance on module plate by the excitation of window regulator motor.

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A Study on the Dynamic Characteristics of Door Module for Vehicle (자동차용 모듈화 도어의 동특성 분석에 관한 연구)

  • Bae, Chul-Yong;Kim, Chan-Jung;Kwon, Seong-Jin;Lee, Bong-Hyun;Jang, Woon-Sung;Lee, Joon-Woo
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.17 no.11
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    • pp.1093-1101
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    • 2007
  • This study presents the design improvement process for door module. Its objective evades the resonance generated at module plate due to the operation of window regulator motor. For this study, the design improvement process is composed of experimental methods having three steps. First step is modal analysis at door assembly status for acquisition of dynamic characteristics which are modal frequency and damping. Second step is a vibration experiment to get the test mode considered an efficiency of window regulator motor. Last step is a vibration measurement by the form of $6{\times}6$ array on module plate. A vibration measurement of $6{\times}6$ array form can be got to three analysis results which are a transfer path of vibration using cross correlation function, a vibration map using OA level and a contribution by frequency band using coherent output power spectrum on module plate. These results are applied to SDM(structural dynamic modification) for design improvement to get around the resonance on module plate by the excitation of window regulator motor.

A Study on Vibration Monitoring for Inferior Window Regulator Selection (자동차 유리창 개폐장치의 불량판정을 위한 진동 모니터링에 관한 연구)

  • Chun, C.K.;Park, S.J.;Yi, G.S.;Ma, Y.S.
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.8 no.1
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    • pp.18-24
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    • 2007
  • If an error occurs in a product that contains a source of vibration, an abnormal noise vibration will occur. Recently a system that has been modified from the previous method of noise detection-a method of appraising the quality of manufactured automobile part by using human ears-is being implemented in the industries of automobile parts. This new system distinguishes the product's vibration signals by measuring and analyzing the signals. Following the recent trend, it has been concluded that the appraisal process of Window Regulator Module needed an improvement. Thus, a vibration monitoring system using LabVIEW, which measures and analyzes vibration signals from a sector gear's connected part by using an accelerometer, has been developed. By analyzing the characteristics of vibration signals of both inferior and superior goods, now the quality of the product can be evaluated much more accurately.

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Prediction of Lift Performance of Automotive Glass Using Finite Element Analysis (유한요소해석을 통한 자동차용 글라스의 승강성능 예측)

  • Moon, Hyung-Il;Kim, Heon-Young;Choi, Cheon;Lee, In-Heok;Kim, Do-Hyung
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.34 no.11
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    • pp.1749-1755
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    • 2010
  • The performance of power window system was decided by driving characteristics of the window regulator part and reaction by the glass run. The performance of power window system usually has been predicted by experimental methods. In this paper, an analytical method using the explicit code was suggested to overcome the limit of the experimental methods. The friction coefficient of glass run was obtained by the friction test at various conditions and the Mooney-Rivlin model was used. Also, a mechanism of window regulator consisted of the fast belt system and the slip ring elements. And, we conducted the analysis considering characteristic of a motor and obtained the lifting speed of automotive glass with high reliability

An Optimized Stacked Driver for Synchronous Buck Converter

  • Lee, Dong-Keon;Lee, Sung-Chul;Jeong, Hang-Geun
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.12 no.2
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    • pp.186-192
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    • 2012
  • Half-rail stacked drivers are used to reduce power consumption of the drivers for synchronous buck converters. In this paper, the stacked driver is optimized by matching the average charging and discharging currents used by high-side and low-side drivers. By matching the two currents, the average intermediate bias voltage can remain constant without the aid of the voltage regulator as long as the voltage ripple stays within the window defined by the hysteresis of the regulator. Thus the optimized driver in this paper can minimize the power consumption in the regulator. The current matching requirement yields the value for the intermediate bias voltage, which deviates from the half-rail voltage. Furthermore the required capacitance is also reduced in this design due to decreased charging current, which results in significantly reduced die area. The detailed analysis and design of the stacked driver is verified through simulations done using 5V MOSFET parameters of a typical 0.35-${\mu}m$ CMOS process. The difference in power loss between the conventional half-rail driver and the proposed driver is less than 1%. But the conventional half-rail driver has excess charge stored in the capacitor, which will be dissipated in the regulator unless reused by an external circuit. Due to the reduction in the required capacitance, the estimated saving in chip area is approximately 18.5% compared to the half-rail driver.

Power System Stabilizer Using Taylor Model (Taylor 모델을 사용한 전력계통의 안정화)

  • 김호찬;김세호
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.17 no.5
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    • pp.111-117
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    • 2003
  • The Taylor model concept is introduced to design a controller with input and output data only. The parameters in Taylor model can be estimated using the input and output data and a controller can be designed based on Taylor model. The accuracy of Taylor model approximation can be improved by increasing the observation window and the order of Taylor model. The LQR method is applied to Taylor model to design power system stabilizers (PSS), and compared with the conventional PSS.

Control Strategies for Multilevel APFs Based on the Windowed-FFT and Resonant Controllers

  • Han, Yang
    • Journal of Power Electronics
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    • v.12 no.3
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    • pp.509-517
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    • 2012
  • This paper presents control strategies for cascaded H-bridge multilevel active power filters (APFs). A current loop controller is implemented using a proportional-resonant (PR) regulator, which achieves zero steady-state error at target frequencies. The power balancing mechanism for the dc-link capacitor voltages is analyzed and a voltage balancing controller is presented. To mitigate the picket-fence effect of the conventional FFT algorithm under asynchronous sampling conditions, the Hanning Windowed-FFT algorithm is proposed for reference current generation (RCG). This calculates the frequency, amplitude and phase of individual harmonic components accurately and as a result, selective harmonic compensation (SHC) is achieved. Simulation and experimental results are presented, which verify the validity and effectiveness of the devised control algorithms.

A Buffer Management Algorithm based on the GOP Pattern and the Importance of each Frame to Provide QoS for Streaming Services in WLAN (WLAN에서 스트리밍 서비스이 QoS를 제공하기 위한 GOP 패턴 및 프레임 중요도에 따른 버퍼 관리 기술)

  • Kim, Jae-Hyun;Lee, Hyun-Jin;Lee, Kyu-Hwan;Roh, Byeong-Hee
    • 한국정보통신설비학회:학술대회논문집
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    • 2008.08a
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    • pp.372-375
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    • 2008
  • IEEE 802.11e standardized the EDCA mechanism to support the priority based QoS. And the virtual collision handler schedules the transmission time of each MAC frame using the internal back-off window according to the access category(AC). This can provides the differentiated QoS to real-time services at the medium traffic load condition. However, the transmission delay of MAC frame for real-time services may be increased as the traffic load of best effort service increases. It becomes more critical when the real-time service uses a compressed mode video codec such as moving picture experts group(MPEG) 4 codec. That is because each frame has the different importance. That is, the I-frame has more information as compared with the P- and the B-frame. In this paper, we proposed a buffer management algorithm based on the frame importance and the delay bound. The proposed algorithm is consisted of the traffic regulator based on the dual token bucket algorithm and the active queue management algorithm. The traffic regulator reduces the transmission rate of lower AC until that the virtual collision handler can transmit an I-frame. And the active queue management discards frame based on the importance of each frame and the delay bound of head of line(HoL) frame when the channel resource is insufficient.

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Output Power Characteristics of CPV Solar Cell due to Non-uniform Illumination (고집광 태양전지의 비균등 조사에 의한 출력특성)

  • Shin, Goo-Hwan;Ryu, Kwang-Sun;Cha, Won-Ho;Myung, Noh-Hoon;Kim, Young-Sik;Kang, Gi-Hwaw
    • 한국태양에너지학회:학술대회논문집
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    • 2011.04a
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    • pp.269-274
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    • 2011
  • A solar cell is primary parts to produce electrical energy from the Sun. And, we can utilize those solar cells as a power generation system in home, factory, and so on. In order to make proper power, the solar cells are configured in series and parallel lay down. In condition of uniform illumination, the solar array will produce an enough power by photovoltaic effects from the solar cells. In case of non-uniform illumination on the solar cells, the power will be dramatically decreased compared to design. Fortunately, there were so many research outputs regarding the illumination effects on solar array. In this work, we tried to find out the non-uniform effects on unit CPV solar cell, because there were no research outputs for unit CPV solar cell considering illumination. The CPV solar cell was used in CPV system to make a power by the Sun. We chosen the triple junction solar cell of GaAsInP2Ge for simulation, which has a 30 % of conversion efficiency. By simulation, we obtained the output performance of CPV solar cells in condition of various illumination by using Hamming Window function. Its performance was degraded by 10 % to 50 % depending illumination conditions.

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Simulation of Characteristics of Lens and Light Pipe for High Concentration Solar PV System (고집광 태양광 발전을 위한 렌즈 및 광 파이프 특성 시뮬레이션)

  • Ryu, Kwnag-Sun;Shin, Goo-Hwan;Cha, Won-Ho;Myung, Noh-Hoon;Kim, Young-Sik;Chung, Ho-Yoon;Kim, Dong-Kyun;Kang, Gi-Hwan
    • 한국태양에너지학회:학술대회논문집
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    • 2011.04a
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    • pp.282-286
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    • 2011
  • The artificial increase in the solar intensity incident on solar cells using lenses or mirrors can allow solar cells to generate equivalent power with a lower cost. In application areas of Fresnel lenses as solar concentrators, several variations of design were devised and tested. Some PV systems still use commercially available flat Fresnel lenses as concentrators. In this study, we designed and optimized flat Fresnel lens and the 'light pipe' to develop 500X concentrated solar PV system. We performed rigorous ray tracing simulation of the flat Fresnel lens and light-pipe. The light-pipe can play imporatant roles of redistributing solar energy at the solar cell and increase the mechanical tolerance so that it can increase the lifetime of the high-concentration solar PV system and decrease the cost of manufacturing. To investigate the sensitivity of the solar power generated by the concentrated solar PV according to the performance of lens and light pipe, we performed raytracing and executed a simulation of electrical performance of the solar cell when it is exposed to the non-uniform illumination. We could conclude that we can generate 95 % or more energy compared with the energy that can be generated by perfectly uniform illumination once the total energy is given the same.

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