• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2003년도 추계학술대회논문집
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• pp.316-323
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• 2003

The gear system is commonly applied in the marine propulsion shafting system using the diesel engine with the power take off/in system and it also is necessary to reduce propeller revolution increasing the propulsion efficiency. The diesel engine has the advantage more than other thermal engines in high thermal efficiency and mobility. But the large vibratory torque which induced by higher combustion pressure is transmitted to these gears. In this paper, the surface durability and bending stress of gear system considering vibratory and transient torque is evaluated by ISO and AGMA regulation. And the influence of these in gear design is investigated with the theoretical analysis and onboard measurement result of torsional vibration.

• 대한기계학회논문집A
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• 제36권5호
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• pp.555-561
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• 2012

자동차 변속기 내부에서 동력을 전달하는 헬리컬 기어의 소음 및 진동을 억제하기 위한 하나의 방법으로 정밀하게 가공된 기어를 검사하기 위한 방법에 관한 것이다. 본 연구에서는 측정 기준이 되는 표준 기어와 측정 대상 기어인 워크 기어를 정밀하게 측정하는 알고리즘에 관한 것이다. 기존의 방법은 표준 기어와 모니터 기어를 1회전하여 주파수 방법으로 측정 표준을 위한 마스터링 작업을 수행하였다. 본 연구에서는 제시된 알고리즘을 사용하여 표준 기어와 모니터 기어를 측정하고, 표준 기어와 모니터 기어의 오차를 계산하는 방법을 제시함으로써 기어 측정에 대한 정밀도를 높이도록 하였다. 또한 본 알고리즘을 사용하면 빠른 속도로 측정의 표준이 되는 마스터링 공정을 빠르고 정확하게 측정할 수 있을 것으로 예상된다.

• 대한기계학회논문집A
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• 제36권5호
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• pp.537-543
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• 2012

본 연구는 운전조건 하에서 감속기 내부기어의 가공정밀도와 소음의 연관 특성에 관한 실험적 연구이다. 이를 위하여 유성기어열로 이루어진 감속기를 제작하였으며, 내부 기어는 정밀도를 다르게 가공한 기어로서 4 세트를 제작하여 비교 실험하였다. 감속기에 대한 소음 및 진동 신호는 신호분석법에 의해 채집되었으며, 정지상태로부터 운전 가능 최고 속도까지 균등하게 증속하며 신호를 채집하였다. 또한 소음 레벨은 소음계를 이용하여 측정하여 비교하였다. 기어의 가공정밀도에 대한 평가는 한국 산업기술 시험원(ktl)에 의뢰하여 일본공업규격(JIS)에 준하여 객관적으로 평가되었으며, 이를 소음, 진동 신호와 함께 비교 분석하였다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 추계학술대회논문집
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• pp.1391-1394
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• 2007

In order for Hypoid gear development. Gears are required to sustain heavy loads or on applications where the gear box is made or a material with a different coefficient of thermal expansion form that or the gears and shafts, it is desirable to make a deflection and contact check under load. The deflection test is performed in the actual gear mounting using completely processed gear. This test should cover the full operating range of gear loads from no load to peak load. Under peak load the contact pattern should extend to the tooth boundaries without showing a concentration of the contact pattern at any point on the tooth surface.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.938-942
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• 2008

To detect the failures in machine, the signals of current, vibration and acoustic emission are widely used in industry. And unexpected failures of gears are not only extremely damaging but also lead to economic losses. In this paper, to detect the misalignment occurred at between two gears in gearboxes, the signals of current, vibration and AE were measured at gearbox and motor power line. FFT(Fast Fourier Transform) was used for current and vibration signal analysis to find gear failure frequency. Especially, the envelop analysis and wavelet transform were applied for AE signal. Therefore, compared with the results of three kinds of signal, the possibility of earily detection by AE is identified or checked.

• 한국소음진동공학회논문집
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• 제19권2호
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• pp.127-137
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• 2009

Hypoid gears are widely used in rear drive and 4WD vehicle axles. Investigation of their sensitivity to deflections is one of the most important aspects of their design and optimization procedures. The deflection test is performed in the actual gear mounting using completely processed gear. This test should cover the full operating range of gear loads from no load to peak load. Under peak load the contact pattern should extend to the tooth boundaries without showing a concentration of the contact pattern at any point on the tooth surface. Transmission error is tested on an axle assembly triaxial real car load condition.

• 한국소음진동공학회논문집
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• 제27권1호
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• pp.36-42
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• 2017

Helical gear excitation is transmitted to a gearbox through the shafts and bearings and the vibration of the gearbox radiates the noise in the air. Therefore gearbox modeling is essential to evaluate the gear noise. This work deals with vibration and acoustic analysis of a cylindrical shell-type gearbox with/without holes excited by helical gears and focuses on the development of the simple gearbox model. To do so, helical gears and bearing forces are calculated. Gearbox with/without holes is modeled by the aluminum end plates and PMMA cylindrical shell body. The vibration mode and the forced harmonic response were calculated by the commercial FE software and the end plate of the gearbox is more contributed to vibration than the body. Acoustic analysis was also conducted by the commercial acoustic software and a cylindrical shell type gearbox with/without holes has the similar vibro-acoustic characteristics.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2013년도 춘계학술대회 논문집
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• pp.555-558
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• 2013

A type of electric propulsion employed by specialized purpose vessels or offshore is the azimuth thruster. Azimuth thruster application had been increasing recently and resulted to excellent vessel maneuverability. However, this system is very complex and some of its major component being exposed under the seawater level presents difficulty in sealing design. For Polar class icebreaker operating in extreme sea condition, this requires a high level of reliability and safety. In this study, the characteristics of lubricating orifice pipe structural vibration installed at the lower reduction gear were investigated and analyzed through beam analysis theory and comparison of experiments. Propeller excitation and the resonant modes of vibration causing excessive vibration and suitable countermeasures to prevent damage due to vibration fatigue on the pipe are presented.

• 한국전자통신학회논문지
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• 제13권5호
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• pp.1023-1028
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• 2018

직접 접촉 방식의 기계적인 결합을 사용하는 기어는 접촉 마찰로 인한 소음, 진동, 발열 등의 문제가 지속적으로 제기되어왔기 때문에, 비접촉 자기(magnetic)결합을 이용한 마그네틱 기어(magnetic gear)가 제안되었다. 마그네틱 기어에 대한 연구 중 동일한 기어비에서 극수에 따라 손실의 차이가 발생함을 확인하였으며, 철손과 영구자석 와류손이 극수에 따라 일정한 경향성을 보일 것으로 예상되어 연구를 진행하였다. 본 논문에서는 마그네틱 기어의 극수에 따른 경향성을 확인하고 구체화하여 마그네틱 기어의 효율 개선 설계의 기반을 마련하였다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2009년도 추계학술대회 논문집
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• pp.498-499
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• 2009