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기계유압식 무단변속기용 기어트레인에 대한 위험속도 해석
배명호(Myung Ho Bae),배태열(Tae Yeol Bae),최성광(Sung Kwang Choi) 유공압건설기계학회 2017 드라이브·컨트롤 Vol.14 No.4
The power train of hydro-mechanical continuously variable transmission (HMCVT) for 8-ton class forklift includes hydro-static units, hydraulic multi-wet disc brake & clutches and complex helical & planetary gears. The helical & planetary gears are key components of HMCVT`s power train wherein strength problems are the main concerns including gear bending stress, gear compressive stress, and scoring failure. Many failures in power train gears of HMCVT are due to the insufficient gear strength and resonance problems caused by major excitation forces, such as gear transmission error of mating gear fair in the transmission. In this study, wherein excitation frequencies are the gear tooth passing frequencies of the mating gears, a Campbell diagram is used to calculate the power train gears’ critical speeds. Mode shapes and natural frequencies of the power train gears are calculated by CATIA V5. These are used to predict resonance failures by comparing the actual working speed range with the critical speeds due to the gear transmission errors of HMCVT’s power train gears.
홍도관(D. K. Hong),권용수(Y. S. Kwon),최재기(J. G. Choi),안찬우(C. W. Ahn) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.10
The purpose of this study is to design 200 ㎾, 15,000 rpm 3 phase induction motor. This research deals with natural frequency and mode shape of rotating shaft of 3 phase induction motor with bearing stiffness by finite element analysis. We present natural frequency characteristic variation of rotating shaft according to change bearing stiffness. Also we are verified stability of rotating shaft from backward and forward critical speed by campbell diagram.
이종남,장강원,이신영 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-
In this work, the vibration of an automobile exhaust system is measured by using a recently-developed magnetic sensor. The magnetic sensor is composed of a solenoid and two pairs of permanent magnets generating an antisymmetric magnetic field in the lateral direction inside the solenoid. Lateral movement of a ferromagnetic pipe inside the magnetic field of the suggested sensor induces an electromotive force in the solenoid corresponding to the lateral velocity of the pipe. Due to the simplicity and non-contact characteristics of the magnetic sensor, dynamic behaviors of the structures operating under high temperature such as an exhaust pipe can be efficiently observed. It is shown that the lateral vibration of the exhaust system can be successfully measured by the suggested sensors. The Campbell diagram of the exhaust system is plotted to examine the vibration characteristics of the exhaust system.
장성현,황현영,정우영,홍정표,최영휴 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-
During a decade, there are many researches on microfactory which is the miniature, flexible, and efficient manufacturing system for the micro/meso scale machining device. Moreover many micro machine tool has developed in Japan, U.S., Europe, and Korea. Already we are developing a desktop milling machine with 380×450×450 ㎣ machine size for microfactory or BT (Bio technology) factory. In this study, we carried out the design analysis of a high speed spindle system for our desktop milling machine by using ADROS, which is our own developed S/W for dynamic design analysis of rotor systems. As the result, we obtained some analyzed dynamic characteristics of a spindle system, such as natural frequency, whirl frequency, critical speed, and harmonic response.
400W, 200,000rpm 급 마이크로터빈용 회전체의 위험속도 해석
홍도관(Do-Kwan Hong),우병철(Byung-Chul Woo),정연호(Yeon-Ho Jeong),김종무(Jong-Moo Kim),조윤현(Yun-Hyun Cho) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
This paper introduces a rotor with shrink fit, its structural analysis and rotordynamic analysis by 3D FEA. First, electrical analysis is performed to develop the ultra high speed motor. The required performances of motor are 400W, 200,000rpm, 89% efficiency ultra speed motor. The rotor size is decided by electrical procedure. At second step, the stability of the rotor structure is evaluated in loading condition(220,000rpm, 210℃) by structural analysis. The final step, the critical speed of rotor is extracted by Campbell diagram. The operating speed should be smaller than critical speed and have enough separation margin. There is no separation margin because of the large size of winding end turn. The outer diameter of rotor is limited by electrical performance. Therefore, that problem is overcame by controlling the supported point of bearing. In future, The prototype will be manufactured and the simulation result will be verified by prototype test.
이종남(Jong-Nam Lee),장강원(Gang-Won Jang),이신영(Sin-Young LEE) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
In this work, the vibration of an automobile exhaust system is measured by using a recently-developed magnetic sensor. The magnetic sensor is composed of a solenoid and two pairs of permanent magnets generating an antisymmetric magnetic field in the lateral direction inside the solenoid. Lateral movement of a ferromagnetic pipe inside the magnetic field of the suggested sensor induces an electromotive force in the solenoid corresponding to the lateral velocity of the pipe. Due to the simplicity and non-contact characteristics of the magnetic sensor, dynamic behaviors of the structures operating under high temperature such as an exhaust pipe can be efficiently observed. It is shown that the lateral vibration of the exhaust system can be successfully measured by the suggested sensors. The Campbell diagram of the exhaust system is plotted to examine the vibration characteristics of the exhaust system.