• Transactions of the Korean Society of Machine Tool Engineers
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• v.15 no.2
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• pp.93-98
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• 2006

This study provides a comprehensive experimental study on the dynamic characteristics of a flexible matrix composite(FMC) driveshaft. A primary objective is to verify the analytic results of the FMC drivetrain based on the equivalent complex modulus approach and the classical lamination theory. A test rig has been constructed, which consists of a FMC shaft, a foundation beam, bearings, external dampers and a driving motor. The frequency response functions and transient responses are obtained from the external excitation and the spin-up testings. It turns out that the analytic results are in good agreement with the experimental ones.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2003.11a
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• pp.109-115
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• 2003

This study intends to provide an optimum design of flexible matrix composite driveshafts using a genetic algorithm. An objective function is defined as a combination of shaft flexibility, whirling stability and torsional buckling and the design variables are selected as ply angles and the shaft thickness. Results show that the genetic algorithm can successfully find an optimum solution at which the overall performance of the FMC shafts is significantly enhanced

• Transactions of the Korean Society of Automotive Engineers
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• v.15 no.3
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• pp.114-123
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• 2007

We are going to propose equations for stable static and endurance strength design of driveshafts. It is very important to decide the contact normal stress of internal components of CV joints. We can estimate the strength, torque capacity, endurance life of CV joints from contact normal stress by presented equation in this paper. Besides it can be shown the equation for shaft design.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2005.11a
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• pp.123-126
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• 2005

This study provides a comprehensive experimental study on the dynamic characteristics of a flexible matrix composite(FMC) driveshaft. A primary objective is to verify the analytic results of the FMC drivetrain based on the equivalent complex modulus approach and the classical lamination theory. A testrig has been constructed, which consists of a FMC shaft, a foundation beam, bearings, external dampers and a driving motor. The frequency response functions and transient responses are obtained from the external excitation and the spinup testings. It turns out that the analytic results are in good agreement with the experimental ones.

• Proceedings of the KAIS Fall Conference
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• 2001.11a
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• pp.117-121
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• 2001

기계설계에서 설계의 객관적인 계산치의 도출을 통한 설계검증이 중요한 부분이다. 여기서 우리는 기계요소 및 시스템 설계용 CAE소프트웨어를 이용하여 설계 검증을 해봄으로서 보다 객관적이고 명확한 설계 개선 안을 쉽게 도출할 수 있다는 것을 제시하고자 한다. 구체적 사례로 발전소 등의 유량을 조정하는 Hollow let Valve 구동축 부분의 안전계수를 검토하여 설계적 개선안을 도출시키고 설계자가 설계하는 단계에서 미리 문제점을 쉽게 발견하고 개선하는 방법을 연구한 결과를 정리한 내용은 다음과 같다.

• Journal of the Korean Institute of Gas
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• v.26 no.2
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• pp.21-26
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• 2022

Since the four-wheel drive transmits the driving force to all four wheels, the traction with the road surface increases, thereby increasing the driving force. However, it has the disadvantage of lowering fuel efficiency. Therefore, four-wheel drive is commonly used as a method of converting to optional four-wheel drive when necessary while driving in two-wheel drive. This selective four-wheel drive converts the driving force by mechanically changing the electric signal sent by the driver in the transfer case. In this study, in order to mechanically change the electrical signal, a reducer is applied to the motor to increase the torque to perform the function. Therefore, in this study, a reduction mechanism applicable to the motor inside the transfer case applied to convert the drive is derived, and the reduction ratio applying the planetary gear type is optimized accordingly. And based on the derived reduction ratio, two sets of planetary gears using a ring gear in common were applied to develop a planetary gear tooth type in which the input shaft and output shaft are decelerated in the same phase. Optimization design was carried out.

• Proceedings of the KIEE Conference
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• 2008.04a
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• pp.251-252
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• 2008

본 연구는 6축 초중량물 핸들링로봇의 제어 성능을 구현하기 위해 전체적이 로봇의 제어에 가장 중요한 요소인 2축과 3축만을 가진 2축으로 된 실험용 로봇을 설계 제작하고 모션 제어기를 직접 설계하여 드라이브를 토크모드로 설정하고 구동실험을 수행하였다. 제어기로는 DSP를 사용하였으며 이는 초중량물을 핸들링하기 위해서는 샘플링주기를 작게 하기 위함이다. 해 연산 실행 속도가 빠른 DSP를 이용하였다. DSP와 AC 서보모터 드라이브 간의 인터페이스를 설계 제작 하였으며, PI제어기 알고리즘을 설계하여 직선보간 알고리즘에 적용함으로써 최종목적인 가반하중이 600Kg급 부하에도 강한 초중량물 핸들링 지능형 6축 로봇의 실현을 위해 원하는 경로를 부하의 영향에 받지 않는 고속 고응답성을 구현할 수 있는 2축 로봇제어에 대만 실험을 수행하였다. 속도, 위치제어에 대한 알고리즘으로는 PID 제어기를 사용하였다. 본 연구의 의의는 초중량물 핸들링 로봇의 제어에 있어서 로봇의 설계 및 제작이 최적화되어 있다면 작은 부하용 로봇의 제어와 크게 다를 바 없음을 보여주는데 있다.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.17 no.4
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• pp.32-38
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• 2018

In this study, the one-piece propeller shaft composed of carbon/epoxy was designed and manufactured for 4 wheel drive automobiles that can bear the target torsional torque performance of 3.5kN.m. For the CFRP tube, braiding machine was used to weaving carbon fiber and it was formed the braided yarns with the braid angle ${\pm}45^{\circ}$ and axial yarns to improve strength of the lengthwise direction. The final CFRP tube of propeller shaft was evaluated through the torsional torque test. The CFRP propeller shaft satisfied requirement of the target torsional maximum torque of 3.5kN.m. Also, it was found that the one-piece composite propeller shaft with CFRP tube had 30% weight saving effect compared with a two-piece steel propeller shaft.

• The Magazine of the IEIE
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• v.7 no.3
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• pp.34-44
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• 1980

몸체부분에 3-자유도와 작업용핸드에 2-자유도를 갖는 원통좌표형 산업용로봇트의 구동용 서어보장치 설계에 관한 연구보고임. 몸체구동을 위한 서어보모터의 제어장치는 속도, 위치 및 전자자전류를 궤환시켜 구성한 피이드백시스템으로 싸이리스터 듀얼 콘버터(Thyristor dual converter)를 이용하여 평균직류전압에 DC 서어보모터의 속도를 제어하도록 구성하였으며 로봇트의 전체적인 동작은 릴레이를 사용하여 구동축을 선택하도록 하였는 바 속도응답특성을 보완하기 위하여 보상회로를 첨가하였음.

• The Journal of the Korea institute of electronic communication sciences
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• v.19 no.1
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• pp.181-188
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• 2024

With the development of precision facility technology, the importance of four-axis CNC precision processing technology is increasing. However, due to complex shape processing, it is difficult to operate the system. This paper compared precision control and efficiency by manufacturing a four-axis control structure to solve this problem and implementing Bresenham's Line Algorithm and Runspeed Algorithm without using commercial programs. When Runspeed was applied, there was an error improvement of about 12.03% and curvature accuracy improvement compared to Bresenham. It was confirmed that precise processing was possible to a three-dimensional structure by driving a rotary shaft A motor.