• Title/Summary/Keyword: gear transmission error

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Investigation of Gear Noise for Industrial Robots (산업용 로봇의 기어소음 특성 고찰)

  • Kim, Dong-Hae;Lee, Jong-Moon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.11a
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    • pp.321.2-321
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    • 2002
  • An industrial robot noise has various noise sources such as gears, motors, bearings, and controller fans. Among these, gears are the most dominant source for noise. The gear noise, caused by tooth profile, elastic deformation, machining error and wear, is directly correlated with the transmission error of mating gear. Due to the fact that has several axis and many gears, it is difficult to understand the characteristics of the vibration and noise of robots. (omitted)

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Determination of the Tooth Modification Amounts for Minimizing the Vibration of Helical Gear (헬리컬 치차의 진동최소화를 위한 치면 수정량의 결정)

  • Chong, Tae-Hyong;Myong, Jae-Hyong;Kim, Ki-Tae
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.11
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    • pp.199-205
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    • 2000
  • The vibration and noise of gears is due to the vibration exciting force caused by the tooth stiffness which changes periodically as the mesh of teeth proceeds and by the transmission error, that is, the rotation delay between driving gear and driven gear caused by manufacturing error and alignment error in assembly and so on. The purpose of this study is to develop how to calculate simultaneously the optimum amounts of tooth profile modification, end relief and crowning by minimizing the vibration exciting force of helical gears. We estimate the vibration exciting force by the mesh analysis of gears. The constraints of this problem consist of contact ratio and strengths of gear teeth such as tooth fillet stress, surface durability and scoring. ADS(Automated Design Synthesis) is used as an optimization tool. And, since the aspect ratio is an important parameter of tooth modification, we investigate the relation between it and the optimum values of tooth modification. The proposed method can calculate the optimum amount of tooth modification automatically and is to be utilized to resolve the problem of vibration of helical gears.

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The Experimental Study of Helical Gear Noise on the Effect of Lead Errors (리드오차의 영향에 대한 헬리컬 기어 소음의 실험적 연구)

  • Park, Chan-Il;Lee, Jang-Mu
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.25 no.9
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    • pp.1475-1482
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    • 2001
  • Nowadays reduction of gear noise in power transmission is very important, because the noise regulation is severe and demand of customer on noise is increased. To reduce gear noise, it is necessary to understand the noise characteristics of helical gear. In this work, we designed test rig for the study of gear noise and installed in semi-anechoic chamber. By using this rig, sound pressure level is measured under varying rotational speed and torque. The frequency characteristics of helical gear noise on the effect of lead errors and torque are discussed.

EXPERIMENTAL IDENTIFICATION ON A GEAR WHINE NOISE IN THE AXLE SYSTEM OF A PASSENGER VAN

  • Kim, S.J.;Lee, S.K.
    • International Journal of Automotive Technology
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    • v.8 no.1
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    • pp.75-82
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    • 2007
  • This paper presents practical work on the reduction of gear whine noise. In order to identify the source of the gear whine noise, transfer paths are searched and analyzed by operational deflection shape analysis and experimental modal analysis. It was found that gear whine noise has an air-borne noise path instead of structure-borne noise path. The main sources of air-borne noise were the two global modes caused by the resonance of an axle system. These modes created a vibro-acoustic noise problem. Vibro-acoustic noise can be reduced by controlling the vibration of the noise source. The vibration of noise source is controlled by the modification of structure to avoid the resonance or to reduce the excitation force. In the study, the excitation force of the axle system is attenuated by changing the tooth profile of the hypoid gear. The modification of the tooth profile yields a reduction of transmission error, which is correlated to the gear whine noise. Finally, whine noise is reduced by 10 dBA.

Development of Reducer for Generating Facility of Electric Power for Low Noise/vibration (소음/진동을 고려한 발전설비용 감속기 개발)

  • Lee, Hyoung-Woo;Park, Chul-Woo
    • Journal of the Korean Society for Precision Engineering
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    • v.25 no.11
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    • pp.73-82
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    • 2008
  • A dynamic model of reducer for generating facility of electric pourer having bevel gear pair and planetary gear train is developed by lumped method. The model accounts for the shaft and bearing flexibilities, gyroscopic effects and the force couplings among the transverse and torsion motions due to gearing. Vibration/noise analysis as well as strength of bevel gear pair and planetary gear train are considered. Exciting forces of high reducer for generating facility of electric power areconsidered as the mass unbalance of the rotors, misalignment and a function of gear transmission error. A Campbell diagram, in which the excitation sources caused by the mass unbalance of the rotors, misalignment and the transmitted errors of the gearing are considered, shows that, at the operating speed, there are not critical speed.

The Vibration Analysis of Cylinder and Screw for Industrial Centrifuge (산업용 원심분리기의 실린더와 스크류 진동해석)

  • 권용수;홍도관;김동영;안찬우;한근조
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.803-806
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    • 2002
  • This paper estimated the stability of centrifuge as its rotating speed compared with the natural frequency of cylinder and screw by finite element analysis. It shows that the one of exciting causes is the tooth passing frequency of input and output parts by the periodic characteristics of transmission error due to an planetary gear having three stages. Also, it proposed the critical speed of cylinder and screw by the Campbell diagram.

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Deflection Test for Low Noise Axle (저소음 Axle 개발을 위한 디플렉션 Test에 대한 연구)

  • Choi, Byung-Jae;Bark, Soon-Gwan;Lee, Kang-Hyun;Jo, Yun-Kyung;Cheon, Seong-Ha
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.11a
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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.

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