• Title/Summary/Keyword: Process compensation

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The Study of the Fabrication of the Ultra-Precision Cylinder by the Compensation Process (보정 가공을 통한 초정밀 원통 가공에 대한 연구)

  • Lee, Jung-Chul
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.12 no.5
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    • pp.122-128
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    • 2013
  • This paper describes the on-machine surface form evaluation of an ultra-precision cylinder for the fabrication by the compensation process. In this study, the surface form error of an ultra-precision cylinder, which was fabricated by the ultra-precision diamond turning machine with a single diamond cutting tool, was evaluated by using two capacitance-type displacement probes. Based on the measurement results, the compensation process was conducted. Since the measurement was carried out on the machine without re-mounting of the workpiece, additional fabrication for compensation process can be conducted precisely.

A Study on the Cutter Runout In-Process Compensation Using Repetitive Loaming Control (반복학습제어를 이용한 커터 런아웃 보상에 관한 연구)

  • Hwang, Joon;Chung, Eui-Sik;Hwang, Duk-Chul
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.3
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    • pp.137-143
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    • 2002
  • This paper presents the In-process compensation to control cutter runout and improve the machined surface quality. Cutter runout compensation system consists of the micro-positioning servo system with piezoelectric actuator which is embeded in the sliding table to manipulate radial depth of cut in real-time. Cutting force feedback control was proposed in the angle domain based upon repetitive learning control strategy to eliminate chip load variation in end milling process. Micro-positioning control due to adaptive actuation force response improves the machined surface quality by compensation runout effect induced cutting force variation. This result will provide lots of information to build-up the preciswion machining technology.

In-Process Cutter Runout Compensation Using Repetitive Learning Control

  • Joon Hwang;Chung, Eui-Sik
    • International Journal of Precision Engineering and Manufacturing
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    • v.4 no.4
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    • pp.13-18
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    • 2003
  • This paper presents the in-process compensation to control cutter ronout and to improve the machined surface quality. Cutter ronout compensation system consists of the micro-positioning servo system with piezoelectric actuator which is embeded in the sliding table to manipulate radial depth of cut in real-time. Cutting force feedback control was proposed in the angle domain based upon repetitive learning control strategy to eliminate chip load variation in end milling process. Micro-positioning control due to adaptive actuation force response improves the machined surface quality by cutter ronout compensation.

A Study on the Cutter Runout Compensation by PI Control in End Mill Process (엔드밀 가공시 비례적분제어를 이용한 커터 런아웃 보상에 관한 연구)

  • Lee, Ki-Yong;Hwang, Jun;Jung, Eui-Sik;Liang, Steven Y.
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.5
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    • pp.65-71
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    • 1998
  • This paper presents in-process compensation methodology to eliminate cutter runout and improve machined surface quality. The cutter runout compensation system consists of the micro-positioning mechanism with the PZT (piezo-electric translator) which is embeded in the sliding table to manipulate the radial depth of cut in real time. For the implementation of cutter runout compensation methodology. cutting force adaptive control was proposed in the angle domain based upon PI (proportional-integral) control strategy to eliminate chip-load change in end milling process. Micro-positioning control due to adaptive acuation force response improves the machined surface quality by compensation or elimination of cutter runout induced cutting force variation. This results will provide lots of information to build-up the precision machining technology.

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A Neural Net Type Process Model for Enhancing Learning Compensation Function in Hot Strip Finishing Rolling Mill (열연 마무리 압연기에서 압연속도 학습보상기능개선을 위한 신경망형 공정 모델)

  • Hong, Seong-Cheol;Lee, Haiyoung
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.6
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    • pp.59-67
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    • 2013
  • This paper presents a neural net type process model for enhancing learning compensation function in hot strip finishing rolling mill. Adequate input and output variables of process model are chosen, the proposed model was designed as single layer neural net. Equivalent carbon content, strip thickness and rolling speed are suggested as input variables, and looper's manipulation variable is proposed as output variable. According to simulation result using process data to show the validity of the proposed process model, neural net type process model's outputs give almost similar data to process output under same input conditions.

An Accurate Current Reference using Temperature and Process Compensation Current Mirror (온도 및 공정 보상 전류 미러를 이용한 정밀한 전류 레퍼런스)

  • Yang, Byung-Do
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.46 no.8
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    • pp.79-85
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    • 2009
  • In this paper, an accurate current reference using temperature and process compensation current mirror (TPC-CM) is proposed. The temperature independent reference current is generated by summing a proportional to absolute temperature (PTAT) current and a complementary to absolute temperature (CTAT) current. However, the temperature coefficient and magnitude of the reference current are influenced by the process variation. To calibrate the process variation, the proposed TPC-CM uses two binary weighted current mirrors which control the temperature coefficient and magnitude of the reference current. After the PTAT and CTAT current is measured, the switch codes of the TPC-CM is fixed in order that the magnitude of reference current is independent to temperature. And, the codes are stored in the non-volatile memory. In the simulation, the effect of the process variation is reduced to 0.52% from 19.7% after the calibration using a TPC-CM in chip-by-chip. A current reference chip is fabricated with a 3.3V 0.35um CMOS process. The measured calibrated reference current has 0.42% variation for $20^{\circ}$C${\sim}$100$^{\circ}$C.

Effect of Compensation System on Job Satisfaction for Care-Workers - Focused on the Mediating Effect of Self-efficacy - (요양보호사의 보상체계가 직무만족도에 미치는 영향 - 자기효능감 매개 효과 중심으로 -)

  • Jang, Seon-Ah;Ko, Jeong-hoon
    • The Journal of the Korea Contents Association
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    • v.21 no.4
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    • pp.473-486
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    • 2021
  • The purpose of this study is to investigate the mediating effect on self-efficacy in the effect of the compensation system of caregivers on job satisfaction. The research method was analyzed with SPSS V22.0 on the data of 367 people surveyed of caregivers working at home welfare facilities and elderly care facilities in the metropolitan area. The result is as follows. First, it was found that the average monthly salary, satisfaction of compensation treatment, and fairness of compensation had a positive effect on job satisfaction in the compensation system of caregivers. Second, in the compensation system for care givers, it was found that monthly average salary, satisfaction with compensation treatment, and compensation process had a positive effect on self-efficacy. Third, it was found that the self-efficacy of caregivers had a positive effect on job satisfaction. Fourth, in the compensation system of caregivers, it was found that the monthly average salary, compensation treatment satisfaction, and compensation process had an effect on job satisfaction, whereas self-efficacy had a positive mediating effect. It revealed that the higher the average monthly salary, compensation treatment satisfaction, and compensation process in the caregiver's compensation system, the more positively the self-efficacy had, and this self-efficacy had a positive effect on the job satisfaction of the caregiver.

A Study of Seam Tracking and Error Compensation for Plasma Arc Welding of Corrugation Panel

  • Yang, Joo-Woong;Park, Young-Jun
    • 제어로봇시스템학회:학술대회논문집
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    • 2003.10a
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    • pp.2701-2706
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    • 2003
  • This paper describes weld seam tracking and error compensation methods of automatic plasma arc welding system designed for the corrugation panel that consists of a linear section and a curved section with various curvatures. Realizing automatic welding system, we are faced with two problems. One is a precise seam tracking and the other is an arc length control. Due to the complexity of the panel shape, it is difficult to find a seam and operate a torch manually in the welding process. So, laser vision sensor for seam tracking is equipped for sensing the seam position and controlling the height of a torch automatically. To attain more precise measurement of an arc length, we measure the 3D shape of the panel and analyze error factors according to the various panel states and caused errors are predicted through the welding process. Using that result, compensation algorithm is added to that of arc length control and real time error compensation is achieved. The result shows that these two methods work effectively.

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Study on Compensation for Shape of Formed Tool for Turning of Bearing Raceway (베어링 궤도 선삭가공용 총형공구의 형상보정에 관한 연구)

  • Moon H.K.;Chung J.H.;Moon S.C.;Joun M.S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.06a
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    • pp.426-429
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    • 2005
  • In this study, the formed tool is used to machine of bearing raceway and a shape compensation scheme is proposed to compensate for shape of it in turning process. It is introduced the conventional design method of the formed tool; a simple depth compensation method and a drawing compensation method. And it is performed to investigate in detail properties of the formed tool about a tool angle and problems of a turning process of bearing raceway using the formed tool. The applicability of the proposed scheme is examined by comparing the experimental results obtained by a new designed formed tool with those obtained by a conventional tool.

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Nonlinearity-Compensation Extended Kalman Filter for Handling Unexpected Measurement Uncertainty in Process Tomography

  • Kim, Jeong-Hoon;Ijaz, Umer Zeeshan;Kim, Bong-Seok;Kim, Min-Chan;Kim, Sin;Kim, Kyung-Youn
    • 제어로봇시스템학회:학술대회논문집
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    • 2005.06a
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    • pp.1897-1902
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    • 2005
  • The objective of this paper is to estimate the concentration distribution in flow field inside the pipeline based on electrical impedance tomography. Special emphasis is given to the development of dynamic imaging technique for two-phase field undergoing a rapid transient change. Nonlinearity-compensation extended Kalman filter is employed to cope with unexpected measurement uncertainty. The nonlinearity-compensation extended Kalman filter compensates for the influence of measurement uncertainty and solves the instability of extended Kalman filter. Extensive computer simulations are carried out to show that nonlinearity-compensation extended Kalman filter has enhanced estimation performance especially in the unexpected measurement environment.

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