• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2002년도 추계학술대회논문집
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• pp.238-243
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• 2002

This paper presents an improved escalator dynamic model so as to reflect the experimental observation on the pseudo-resonance affected by load applied. The experimental evidence reveals that backlash of gearbox as well as sag of driving chain are most critical factors to the pseudo-resonance in escalators. The dynamic model effectively reflects vibration characteristics measured in real escalators with respect to different conditions of driving chain and the number of passengers. For validation of the dynamic model developed, numerical results from the model are compared with experimental results. The developed model and its simulation results are used rigorously for the design of escalator systems in enhancing the ride comfort.

• 한국기계가공학회지
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• 제11권4호
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• pp.154-159
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• 2012

Condition monitoring(CM) is a method based on Non-destructive test(NDT). Therefore, recently many kind of NDT were applied for CM. Acoustic emission(AE) is widely used for the early detection of faults in rotating machinery in these days also. Because its sensitivity is higher than normal accelerometers and it can detect low energy vibration signals. A machine tool consist of many parts such as the bearings, gears, process tools, shaft, hydro-system, and so on. Condition of Every part is connected with product quality finally. To increase the quality of products, condition monitoring of the components of machine tool is done completely. Therefore, in this paper, acoustic emission method is used to detect a machine fault seeded in a gearbox. The AE signals is saved, and power spectrums and feature values, peak value, mean value, RMS, skewness, kurtosis and shape factor, were determined through Matlab.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1991년도 춘계학술대회 논문집
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• pp.158-165
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• 1991

DC servo motors have small torques compared to their weight. In order to reduce the speed and increase the output torque of the DC motor, a gear box is commonly used. The use of a gearbox, however, imposes limitations onmany applications because of the backlash and the reduction in transmission efficiency. Furthemore, the elastic deformation or the compliance of the gearbox decreases the accuracy of the servo mechanism and the stability of the system. In view of the many disadvantages in using the gearbox, a more effective solution has to be found. The solution is the direct drive mechanism. There are many kinds of direct drive motors. I will consider the ultrasonic motor in particular.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 추계학술대회 논문집
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• pp.334-341
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• 2004

This study is to establish design method and evaluation technology for drive system appropriate to high speed tilting train. The transmission system of high speed train serves in the severe condition compared with those of KHST(G7), namely, they have to transmit high power to run with high speed and they have to make maximum use of the limited space. This paper reports the reviews and results of the design and evaluation method for reduction gearbox of high speed tilting train and discusses various design items and methods about assembly and parts of reduction gearbox.

• 한국기계가공학회지
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• 제10권2호
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• pp.52-60
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• 2011

Korea is the best country for ship-building. But nowadays, the speedboat and yacht are not mostly developed yet. For the sleek lines of ship, more innovative transmission system should be obtained in the ship industry. In general, marine transmissions often use the straight shafts and the helical gears. So it makes problem that engine-room requires large space. In this case, conical gear is the best solution for this. Until now, technology of conical gear is not generalized, but it will be increased more through many applications. So, in order to get conical gear design technology by ourselves, this thesis is conducted. This paper was written to gain useful information of marine gearbox design applied conical gear through the measurement of backlash, computer analysis and tooth contact test of helical conical involute gear pairs.

• 한국산학기술학회논문지
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• 제9권6호
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• pp.1494-1499
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• 2008

플라스틱은 양호한 내구성과 더불어 가벼우면서 장시간 경과하여도 변질이 없는 특성으로 인하여 자동차 내장 부품의 가장 주요한 소재로 활용되어지고 있다. Moldflow를 이용한 자동차 기어박스커버의 플라스틱 사출공정 시뮬레이션을 통해 충전시간, 웰드라인, 에어트랩 등 사출성형 공정에 대한 사전분석을 제시하였다.

• 전기학회논문지
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• 제64권12호
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• pp.1718-1723
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• 2015

The diameter of the rotor of 2MW wind turbine is being developed by a number of companies with more than 80m, reliability and economic efficiency of the wind power generator has been improved. The need for large-scale wind turbine with excellent economy has been attracting attention because the new orders and the location of the wind turbine market has reached a limit. Technology development for enlargement of wind turbine is possible not only the improvement of energy efficiency but also reduce the construction costs per unit capacity. However, mechanical gearboxes used in wind generators have problems of wear, damage, need for lubrication oil and maintenance. Therefore, we want to configure the gearbox of a large-scale wind turbine using a magnetic gear in order to solve these problems of mechanical gearbox.

• Journal of Biosystems Engineering
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• 제34권2호
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• pp.82-88
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• 2009

This study was conducted to detect faults in a gearbox comprised of gears, bearings and shafts. The envelope analysis was used as a method of detection, which could detect breakage and pitting of gears and bearings, and misalignment of shafts effectively. Vibration measured at the increaser was analyzed to characterize the faults. When the increaser has a defect, peaks with a constant period appear in the time history of vibration and its harmonic components also in the envelope spectrum. The envelope analysis showed that a crack in the stepped output shaft caused the increaser to generate the abnormal peaks.

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2018년도 공동국제학술발표회
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• pp.177-177
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• 2018

• 한국정밀공학회지
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• 제17권2호
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• pp.105-113
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• 2000

For exact spherical involute bevel gear, serveral researchers had developed the mathematical models. The solid models of straight bevel gears are obtained and inspected to avoid interference by computer graphics. Furthermore, A gearbox is assembled by spherical involute bevel gears, which are manufactured by CNC machine. The transmission errors in the tooth mesh are measured by Laser sensor, are compared with the AGMA standard. This gearbox is found to be ranked AGMA Q10(JIS 3)