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A Study on the Development of Hall Effect Sensor for Hydraulic Locking Alarm in Ship’s Steering Gear
Jung-Min Lee(이정민),Won-Jee Chung(정원지),Dong-Jae Lim(임동재),Kyung-Shin Choi(최경신) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.1
The LVDT (Linear Variable Displacement Transducer) type sensor used for the existing ship"s steering gear is simple on / off that does not perform proportional control operation to the control & unloading device. When the main spool is located at both extremes, It is reflected in the price by using an expensive sensor for import. In this paper, the Hall Effect Sensor is applied to Hydraulic Locking Alarm to analyze classification rules, structure, characteristics and operation principle of valves, and research on localization development in terms of cost reduction. The comparative analysis of the existing prototypes and the cause analysis of the problems were carried out, and the structural analysis showed satisfactory results within the allowable stress range. In addition, it was verified through experiments that the actual operation is realized by applying the actual developed product, and it was confirmed that the load on the maximum value exceeds the allowable maximum load even in the case of the universal tensile test in preparation for the departure of the rod casing.
3-Axis SCARA Robot의 진동저감을 위한 Finite Jerk 기반 속도 제어에 관한 연구
정원지(Won Jee Chung),김정현(Jung Hyun Kim),주지훈(Ji Hun Ju) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
This paper present the result that techniques of velocity control based on Finite Jerk to reduce Vibration of 3-Axis SCARA Robot using AC-servo motor. In case of the high speed motion, jerk (the first derivative of acceleration) is the principle factor of vibration of the robot mechanical part. Therefore we can reduce vibration of 3-Axis SCARA Robot using Finite Jerk (taken trapezoidal acceleration form) by control Jerk duration time. (△t) This paper prpose Finite Jerk velocity profile, apply Finite Jerk to 3-Axis SCARA Robot using LabVIEW<SUP>®</SUP> and NI PXI-7350 Motion Controller. And Robot motion applied Finite Jerk compare vibrations with trapezoidal and S-Curve velocity mode.
관측성을 이용한 3축 SCARA Robot의 오차분석을 위한 Monte-Carlo simulation 및 측정
정원지(Won-Jee Chung),주지훈(Ji-Hun Ju),김정현(Jung-Hyun Kim) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
This paper aims at finding out dominant robot configurations with maximal position errors, which can be attributed to the parameter errors, by using Monte-Carlo (based) simulation technique for error analysis of a 3-axis SCARA (Selective Compliance Assembly Robot Arm) type robot. In particular, the Monte-Carlo (based) simulation is used for virtually measuring on the position errors, instead of physical measurement. In order to measure the observability of the model parameters with respect to a set of robot configurations, we propose the observability index which is defined as the product of singular values for error propagation matrices. Thus the index can be used for discriminating dominant robot configurations from a set of simulated ones in conjunction with standard deviation of positional errors, This paper analyzed error by robot positional errror. And measured actuality 3 Axis SCARA types' positional error (Repeatability) of robot.