• Title/Summary/Keyword: Anti-vibration design

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Analysis of Natural Frequency of Simple Steel Outfitting Structure in Engine Room (기관실 단순 철의장품 모델 고유 진동수 해석)

  • Jung, C.S.;Kim, D.S.;Cho, S.A.;Chang, S.I.
    • Special Issue of the Society of Naval Architects of Korea
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    • 2006.09a
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    • pp.106-111
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    • 2006
  • The steel outfitting structures installed in engine room are vibrated by an excitation of the engine and the propeller. Vibration problems such as cracks and fitting breakages are mainly induced at the near range of the resonance. The excitation frequency estimation is possible by engines and propeller specifications, but the natural frequency of a steel outfitting structure is not easily estimated due to the complication and variety of the designed shape. This paper represents natural frequency data of simple steel outfitting structures. As a vibration analysis tool, MSC/NASTRAN was used to calculate natural frequencies. Natural frequencies were compared in case of the shape and boundary condition changes of simple models, and anti-vibration models of the steel outfitting structures were presented on the basis of results.

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Stiffness Analysis of Compressed Rubber Components for Anti-Vibration (압축된 방진고무의 강성 해석)

  • Kim, Kug-Weon;Lim, Jong-Rak;Ahn, Tae-Kil
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.6
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    • pp.141-147
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    • 1999
  • Optical disk technology with a laser beam for data recording and retrieval is one of the most promising route for high density information storage in multimedia era. As the storage density and data transfer rates are increased, mechanical issues, mainly noise and vibration, become critical. Rubber materials are extensively used in various machine design application, mainly for vibration/shock/noise control devices. Over the years an enormous effort has been put into developing procedures to provide properties of rubber components with complex shape and under pre-deformed state. In this paper, non-linear large deformations of a rubber mount for optical disk drive were investigated using the finite element method. A tension test of rubber material was performed, to calculate a strain energy function. According to the pre-deformed state, the variation of rubber mount stiffness were calculated and the reliability of numerical results were checked by compared with the measuring the deflection values. Also, the effects of the pre-deformed rubber mount on the system dynamic characteristics were investigated and the relation between the static stiffness variation of rubber mount and the natural frequence variation of system was discussed.

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Influence of die design variables on the sheared surface in cut-off process of sandwich sheet metal (샌드위치 강판의 전단가공에 있어서 전단면에 미치는 금형 설계 변수의 영향)

  • Kim J. Y.;Choi J. S.;Kim J. H.;Chung W. J.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2004.05a
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    • pp.57-61
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    • 2004
  • in order to improve the quality of the sheared surface in cutting of sandwich sheet metals the cut-off operation is mainly investigated which is the typical shearing process in sheet metal forming technology. For experiments the cut-off die is made which can be easily adjusted by die design variables such as blankholding force, pad force, and clearance. The sheet metals chose as specimen are clad304(STS304-Al1050-STS304) and anti-vibration sheet metal. The shearing process is visualized by the computer vision system installed in front of the cut-off die and the sheared surface before and after cut-off operation is measured and quantitatively compared with the help of the optical microscope. From test results the good sheared surface was shown when the clearance gets small with large blankholding force.

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Design an Anti-Skid System using Fuzzy Model-Based Controller (퍼지 모델 기반 제어기를 이용한 안티 스키드 시스템의 설계)

  • Lee, Sung-Ho;Kim, Young-Guk;Kim, Seog-Won;Park, Jin-Bae
    • Proceedings of the KSR Conference
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    • 2006.11b
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    • pp.1276-1281
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    • 2006
  • In general, the wheel-skid prevention of braking system is very important in modern railway applications. This is because wheel-skid can lead to an increase in noise and vibration from wheels with flat points, as well as an increased braking distance. However conventional anti-skid control has problems because wheel adhension and skid characteristics are very difficult nonlinear systems and time consuming to accurately model. In this paper, we design a fuzzy controller using a model of relation between ahdension and braking force, we show that anti-skid fuzzy controller has a very good performance, performing better than the previous conventional controller.

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Design and Performance Test of Fungal Aerosol Generator using Vibration Method (진동 방식을 이용한 곰팡이 공기 부유화 장치의 설계 및 성능 평가)

  • Ahn, Ji-Hye;Lee, Sang-Gu;Park, Chul Woo;Hwang, Jungho
    • Particle and aerosol research
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    • v.8 no.4
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    • pp.143-150
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    • 2012
  • Fungal particles have been known to aggravate indoor air quality. To develop fungal particle cleaning devices requires a well-controlled generator of fungal aerosol particles. In this study, a novel fungal aerosol generator was designed and tested for anti-fungal experiment. Cladosporium cladosporioides was selected as test fungal particle. After aerosolization, the number concentration and the size of particles were measured by aerodynamic particle sizer. The number concentration depended on the vibration strength and vibration period of the designed fungal aerosol generator. For the vibration strength of 10volt and the period of 10 sec (5 sec on and 5 sec off), the stable particle generation with concentration of 10#/cm3 was maintained during 35 minutes.

Reduction of Residual Vibration for 2 Axes Overhead Crane by Input Shaping (입력성형기법에 의한 2축 천정크레인의 잔류진동 감소)

  • 박운환;이재원;노상현
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.4
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    • pp.181-188
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    • 2000
  • Input shaping is a method fur reducing residual vibration. Vibration is eliminated by convolving an input shaper, which is a sequence of impulses, with the desired system command. It has been applied to robot with a flexible manipulator. But it can be applied to the reduction of residual vibration far overhead crane. In this paper, input shaping shows good performance for anti-sway of overhead crane. In the z-domain, we designed an input shaper and calculated the sensitivity of it. If sensitivity is calculated in the z-domain, the shapes of sensitivity curves are expected easily. Accordingly, it is easy to design an input shaper in the z-domain. We compared the response of a system with shaper to it without that. Also, we compared El shaper to ZV shaper in view of robustness.

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Isolation of a Commercial Workstation (상용 워크스테이션의 방진)

  • 이재홍;박혁성;권병현;안광철;박영필
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 1997.04a
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    • pp.121-127
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    • 1997
  • Normal operation of a workstation in a ship must be secured under any circumstances. Rugged workstation has been imported and there have been many difficulties in maintaining that system such as high cost, delayed after-service and etc. For that reason, a commercial workstation is decided to replace the rugged workstation. But as there is no anti-vibration design in the commercial workstation, a passive vibration isolation system consisted with oil damper and spring is applied. Through theoretical study and experiments, the proposed vibration system is proved to work effectively and make the commercial workstation be able to be used in a ship.

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