• Transactions of the Korean Society of Machine Tool Engineers
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• v.16 no.6
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• pp.103-109
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• 2007

With the increase of track density, high rotational speed and the compatibility for various media in optical disk drives, the effective design to vibration reduction is very important for robust operation. Especially when a slim optical disk drive for a notebook PC is excited by a mass-unbalanced disk, internal vibration and its transmission to external case bring about severer problem than that of conventional one. In this paper a design process of a rubber mount in a slim optical disk drive for vibration reduction is presented. The characteristics of rubbery materials - hyper-elastic and visco-elastic - are measured with standard specimens. The static stiffness of a rubber mount was calculated by FEM and the dynamic stiffness is predicted with the static stiffness and the impedance test data of the standard specimen. The transmissibility tests are performed for the purpose of verification of the design process.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2002.02a
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• pp.104-110
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• 2002

본 연구는 보행형 관리기의 손으로 전달되는 진동특성을 실험적으로 해석하고 평가하며 방진 방안을 제시할 목적으로 수행되었다. 관리기의 작업기 중에서 설문을 통해 사용 빈도가 높은 3개의 작업기(중경로터리, 중경제초기, 구굴기)를 선정하였고 각 작업기별 진동수준을 측정하였다. 진동 방지 방안에 대해서는 4개의 방진 장치(고무 패드, 방진 장갑, 핸들 방진 장치, 엔진 마운트)를 선정하여 각 방진 장치별 진동수준을 측정하였다. 방진 장치의 성능을 정확하게 비교하기 위해 진동의 측정은 진동수준이 가장 높은 구굴기에서 수행되었다. 실험결과에 의하면 관리기 작업이 작업자의 인체에 해를 끼칠 위험이 매우 크지만 이 결과는 작업자가 매일 3시간씩 관리기를 사용할 경우를 기준으로 설정한 값이기 때문에 실제로 관리기 사용일수가 많지 알은 대부분의 우리나라 사용자들에게 적용하는데는 한계가 있음을 밝힌다. 그렇다 하더라도 관리기의 주 사용자는 보행형 관리기 뿐만 아니라 보행형 경운기나 보행형 이앙기 등의 손으로 전달되는 진동이 심한 기계를 함께 사용하는 경우가 많음을 고려하면 방진 장치를 개발하거나 진동수준이 낮은 농작업기계를 개발하여 작업환경을 개선하는 조치가 필요하다고 생각한다. 그러므로 농작업기계에 대한 진동수준에 대한 종합적인 연구와 그에 대한 대책 마련이 지속적으로 수행되어야 할 것이다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1995.10a
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• pp.782-787
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• 1995

Rubber isolator has many advantages compared with steel spring mount. Rubber has high internal damping and can be formed various shape depending on specific purpose. On the contrary, low modulus of elasticity of rubber results the instability of rubber isolator by buckling phenomenon. This paper presents the development of shear type rubber isolator for industrial application by using shear rigidity property of rubber. The static load-deflection characteristics of developed isolator has been analyzed by the FEM. Consequently, the static load testing and a measure of the effectiveness of a vibration isolator in terms of force transissibility for developed isolator have been carried out.

• Journal of the Korean Society for Precision Engineering
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• v.15 no.10
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• pp.58-64
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• 1998

Rubber isolator has many advantages compared with steel spring mount. Rubber has high internal damping and can be formed various shape depending on specific purpose. On the contrary, low modulus of elasticity of rubber results the instability of rubber isolator by buckling phenomenon. This paper presents the development of shear type rubber isolator for industrial application by using shear rigidity property of rubber. The static load-deflection characteristics of developed isolator has been analyzed by the FEM. Consequently, the static load testing and a measure of the effectiveness of a vibration isolator in terms of force transmissibility for developed isolator have been carried out.

• Transactions of the Korean Society of Mechanical Engineers
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• v.10 no.3
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• pp.305-315
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• 1986

Redesign of the mounting system to minimize vibration of a variable displacement engine through computer simulation is considered. A three degree of freedom model is established for an in-line four-cylinder automobile engine with a three point mounting system. The engine mount locations and angles, and isolator sizes are chosen as design parameters. Constraints on isolator deformations and design parameters are imposed. The gradient projection method is utilized for optimization. Simulation studies show significant vibration reduction can be obtained especially at idling speed.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2009.10a
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• pp.696-697
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• 2009

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2010.10a
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• pp.175-176
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• 2010

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2011.06a
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• pp.1227-1228
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• 2011

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2009.04a
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• pp.511-517
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• 2009

The mechanical impedance and stiffness of the foundation of shipboard equipments and hulls supported by anti-vibration mount are very important so that the anti-vibration mount can accomplish its performance effectively. But, it is frequently argued how much stiffness and mechanical impedance are necessary for those foundations and hulls. In this research, it is discussed by evaluating the dynamic stiffness of the commercial anti-vibration mounts used in a naval vessel. Consequently, in this research, the minimum level of the mechanical impedance and stiffness of the foundation of shipboard equipments and hulls are suggested considering the dynamic stiffness of the mount which varies as frequency.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.19 no.3
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• pp.320-326
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• 2009

The mechanical impedance and stiffness of the foundation of shipboard equipments and hulls supported by anti-vibration mount are very important so that the anti-vibration mount can accomplish its performance effectively. But, it is frequently argued how much stiffness and mechanical impedance are necessary for those foundations and hulls. In this research, it is discussed by evaluating the dynamic stiffness of the commercial anti-vibration mounts used in a naval vessel. Consequently, in this research, the minimum level of the mechanical impedance and stiffness of the foundation of shipboard equipments and hulls are suggested considering the dynamic stiffness of the mount which varies as frequency.