• Title, Summary, Keyword: Noise Reducer

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A Study on the Noise and Vibration Diagnostic of the Industrial Robot Reducer (산업용 로봇 감속기의 소음 진동 평가에 대한 연구)

  • Kim, Woo-Hyung;Chung, Jin-Tai
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.875-878
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    • 2004
  • The noise and vibration diagnostic of the industrial robot reducer is ultimately the purpose. We evaluated a noise and vibration tendency of the industrial robot reducer to be made in the outside (RV reducer) through the experiment. Also, we compared the RV reducer to the industrial robot reducer (RD reducer) in the domestic. We measured the noise level with the sound level meter and analyzed the vibration tendency with the waterfall plot. Through the comparison of RV reducer and RD reducer diagnose the industrial robot reducer. We guessed the improvement direction of RD reducer. (The domestic's industrial robot reducer).

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A Study on Noise Reduction for an Industrial Right-angled Reducer (산업용 직각형 감속기의 소음 저감에 대한 연구)

  • Seo, Hong-Seung;Park, Sung-Pil;Chung, Jin-Tai
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.21 no.6
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    • pp.546-552
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    • 2011
  • In this study, noise sources of a reducer which is combined a spiral bevel gear and a planocentric gear are identified by experimental method and the noise was reduced by the structure modification of the reducer. In order to identify the noise sources, noise and vibration signals were measured by microphone and accelerometer and these signals were analyzed with waterfall plot. In addition, the frequency response functions were obtained to prove the noise and vibration sources. It was found that the resonance was generated by the gear mesh frequencies and natural frequency of the reducer. The noise of the reducer could be reduced by structure modification.

A Study on Noise Reduction for the reducer designed right angle (산업용 직각형 감속기의 소음 저감에 대한 연구)

  • Seo, Hong-Seung;Park, Sung-Pil;Chung, Jin-Tai
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.51-56
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    • 2011
  • In this study, noise sources of a reducer which is combined a spiral bevel gear and a planocentric gear are identified by experimental method and the noise was reduced by the structure modification of the reducer. In order to identify the noise sources, noise and vibration signals were measured by microphone and accelerometer and these signals were analyzed with waterfall plot. In addition, the frequency response functions were obtained to prove the noise and vibration sources. It was found that the resonance was generated by the gear mesh frequencies and natural frequency of the reducer. The noise of the reducer could be reduced by structure modification.

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Installation Effect on Noise Reducer for Railway Traffic Noise (철도환경소음을 줄이기 위한 소음감소기의 설치제안)

  • Kim, Jeung-T.;Hong, Yoon-H.
    • Journal of the Korean Society for Railway
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    • v.10 no.3
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    • pp.278-283
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    • 2007
  • Community noise, especially a rail traffic noise has been serious social issues in Korea. Our society needs practical tools to reduce noise levels for public who live near the railway lines. This paper proposes a noise reducer for railway traffic noise. At the beginning, various types of reducers are discussed, with the advantages and disadvantages with respect to acoustical phenomena. Then, the acoustic effects are discussed based on an insertion loss measurement. After several types of reduces are installed at fields, the noise level is monitored with and without the reducer. The result shows that the proper selection of reducers affects the noise level by 6 dB. The statistics of the mean and a standard deviation turns out to be 3.2 dB and 0.8 dB, respectively. Noise reducers are strongly recommended for the place where apartments are densely constructed alone the railway. Installation of noise reducers seems to be an effective and practical solution for the community traffic noise reduction.

Multibody modeling and Analysis on Difference of Pin-reaction Force and Vibration caused by Offset in Fixed Outer Ring Type Cycloidal Speed Reducer (다물체 모델링을 이용한 외륜 고정형 Cycloid 감속기의 Offset에 의한 핀반력 및 진동차이 분석)

  • Kim, Hong Ki;Lee, Ki Bok;Yoo, Hong Hee
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.22 no.11
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    • pp.1057-1063
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    • 2012
  • A cycloid speed reducer is a type of the speed reducers. The cycloid speed reducer has a eccentric rotating motion and offset to avoid some problem of assembly, so it has a disadvantage for vibration. In this paper, a multi-body dynamic model is developed for a cycloid speed reducer and the dynamic behaviors of the reducer are investigated. The cycloid speed reducer consists of cycloidal plate gears, housing gear, input shaft, output pin and shaft, and eccentric bearings. Using a CAD program, each component of cycloid reducer is modeled based on the offset and multi-body simulations are performed using Recurdyn. As a result, the pin reaction force and the amplitude of bearing displacement are increased by the offset.

An Experimental Study on the Noise Identification of a Planocentric Gear Reducer (내접 유성식 감속기의 소음원 규명에 대한 실험적 연구)

  • Chung, Jin-Tai;Hong, Il-Hwa;Yoon, An-Soo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.697-701
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    • 2007
  • In this paper, noise sources of a planocentric gear reducer are identified by experimental mehod. This study consider a reduction method of a noise/vibration about the gear, axle, bearing and others. Namely, the purpose of this study is to reduce a noise/vibration for a stability of the total system. Form the data to be measured through an experimental method, the problems of the gear, axle, bearing and others are examined closely, and the reducer is derived the model to be the engineering. The mechanism of the problem occurrence is examined through a parametric research about an each influence factor(Load). Lastly, the results of this study propose the model to be improved.

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Vibration Analysis of Planetary Fixed Outer-ring Type Cycloidal Speed Reducer by using Multi-body Modeling (다물체 모델링을 이용한 2단 유성식 외륜 고정형 사이클로이드 감속기의 진동특성분석)

  • Kim, Hong Ki;Lee, Ki Bok;Yoo, Hong Hee
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.23 no.3
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    • pp.234-239
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    • 2013
  • There are many types of speed reducer for industrial uses. However the cycloid speed reducer is widely used in manipulators based on excellent performance of low backlash, high reduction ratio and compact size. It is essential to use precision speed reducer for accuracy of position controls on robot systems and electric vehicles. The cycloid speed reducer has a eccentric rotating motion and offset to avoid some problem of assembly, so it has a disadvantage for vibration. In this paper, a multi-body dynamic model is developed for a cycloid speed reducer and the dynamic behaviors of the reducer are investigated. The cycloid speed reducer consists of cycloidal plate gears, housing gear, input shaft, output pin and shaft, and eccentric bearings. Using a CAD program, each component of cycloid reducer is modeled based on the offset and eccentric. Multi-body simulations using Recurdyn and test using a rig tester are performed. As a result, the pin reaction force and the amplitude of housing displacement are increased by the larger offset and smaller eccentric value of cycloid reducer.

Vibration Evaluation of Concrete Mixer Reducer (콘크리트 믹서 감속기의 진동 평가)

  • Cho, Yonsang;Bae, MyoungHo
    • Tribology and Lubricants
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    • v.35 no.1
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    • pp.71-76
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    • 2019
  • The differential planetary gear reducer as a main component of the concrete mixer driving mechanism requires a strong torque to mix concrete compounds. As this component is currently dependent on imports, it is necessary to develop it by conducting a study on vibration analysis and the resonance problem. The noise and vibration of a concrete mixer reducer increase owing to the transmission error of planetary gears, and the damage of components occurs owing to the problems in design and production. In this study, the tooth-passing frequency is calculated to evaluate the noise and vibration of a mixer reducer, and a fast Fourier transform (FFT) analysis is conducted through a vibration test using an acceleration sensor. The vibration of the reducer is measured at three points of input and output of the shaft and planetary gear housing with fixed and variable revolutions per minute. The operating conditions of gears and bearings are evaluated by performing the FFT analysis, and the resonance problem is verified. The results show that No. 1 pinion and ring gears revolve disproportionately. The amplitude values appear high, and the wear of tooth faces occur in tooth-passing frequencies and harmonic components of No. 1 and No. 2 pinion-ring gears. Therefore, we conclude that design changes in the reducer and a correction of tooth profiles are required.

A Study on Noise Reduction for the Driving System of a Forklift (지게차 구동부의 소음 진동 저감에 대한 연구)

  • Kim, Woo-Hyung;Hong, Il-Hwa;Chung, Jin-Tai
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.18 no.1
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    • pp.80-86
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    • 2008
  • In this study. the noise sources were identified and the noise and vibration were reduced for an industrial forklift. To identify the noise sourses, noise signals were measured by a microphone on a driver seat and these signals were analyzed with a waterfall plot. For this purpose, the gear mesh frequencies from the gear box of a reducer were not only investigated but noise/vibration sourses of an electric motor were also examined. Furthermore, the frequency response functions were obtained to confirm the vibration and noise sourses. It was found that severe vibration and noise were generated in the casing and the connecting part of the reducer. The severe vibration and noise could be reduced by a structure modification.