• 제목/요약/키워드: Anti-vibration device

검색결과 35건 처리시간 0.024초

손으로 전달된 관리기 진동의 분석과 방진대책 (Analysis and Isolation of Walking-type Cultivator Vibration Transmitted to Operator′s Hands)

  • 박영준;김경욱
    • Journal of Biosystems Engineering
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    • 제27권4호
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    • pp.273-282
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    • 2002
  • This study was intended to measure and analyze hand-transmitted vibrations from cultivator in idle and operation modes for three different types of field works. Based on this analysis a time for the white finger syndrome to appear on 10% of the operators was estimated assuming that their daily exposure is 3 hours. The 4 methods to reduce the hand vibration were also proposed and compared with each other. The results of the study were summarized as follows : The highest vibration level was recorded during trenching operation, resulting in a total average vibration of 11.5 m/s$^2$. Followings were 7.6 m/s$^2$ during rotary tillage and 7.0 m/s$^2$ for weeding. When exposed to these levels of vibrations three hours a day, the white finger syndrome is likely to appear in 4 years for trenching, 6.2 years for rotary tillage and 6.8 years for weeding operations. Isolation of hand vibration performed by a rubber pad, anti-vibration gloves, a handle anti-vibration device and engine mounts were respectively 15.7%, 16.5%. 26.1% and 27.0%, resulting in most effective methods of the handle anti-vibration device and engine mounts. A better performance of about 33.9% was achieved when both the handle anti-vibration device and engine mounts were used.

PND 의 내진특성 개선 (Anti-vibration and Shock-resistant Design for Personal Navigation Device)

  • 황효균;하상우;유승헌;최인호
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2008년도 춘계학술대회논문집
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    • pp.861-862
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    • 2008
  • One of trend of portable devices is convergence with other devices, especially with navigation system. This converged system is generally called PND (Personal Navigation Device). This detachable device is developed for personal entertainment in everyday life and navigation system when deriving, so it should meet the specification of vehicle thermal environment, anti-vibration as well as the anti-shock by sudden drop. In this paper, the way to design the hard disk drive damper with CAE, is introduced to get a reliable system from the beginning of the design step.

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Flexible Palm 어댑터의 개발을 통한 동력 공구의 진동 특성을 고려한 방진장갑의 성능 평가 (Estimation of Anti-vibration Glove Performance Considering the Vibration Characteristic of Power Tool through Development of Flexible Palm Adapter)

  • 송치문;장한기;홍석인;채장범
    • 한국소음진동공학회논문집
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    • 제19권2호
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    • pp.217-224
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    • 2009
  • This study aims to show the guideline to select optimal anti-vibration gloves for specific power tools to prevent hazardous vibration to human body. It is most desirable for the correct evaluation of handtransmitted vibration form the power tool handle to measure the acceleration between the handle surface and the hand palm as recommended in ISO 5349-1. First, the accurate acceleration measurement device was developed of which the thickness and weight were less than 6 mm and 12 g respectively so that it can be placed between the handle and the palm without any inconvenience during the measurement. Finally, using the device we estimated anti-vibration glove performances considering the frequency characteristics of generated vibration by the power tool.

프레스 광전자식 방호장치의 충격진동 저감 (Shock and Vibration Reduction of the Opto-Electronic Protective Device for the Press Machine)

  • 최승주
    • 한국안전학회지
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    • 제26권5호
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    • pp.13-16
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    • 2011
  • The vibration and shock of the opto-electronic protective device was induced mechanical failure or fail to work correctly. In order to identify the exciting frequency components of vibration and shock, vibration signals are measured and analyzed from the mechanical power press. In addition, the modal test for the opto-electronic protective device was performed to investigate the dynamic characteristics. Some FEM simulations were carried out and then anti vibration mount was made for opto-electronic protective device. Based on the results of simulations, some kind of rubber mounts were tested to demonstrate the reduction of vibration and shock. It was verified by the test that a considerable amount of vibration and shock were reduced.

콘테이너 크레인의 헤드블록 횡동요 해석 (Swing Motion Analysis of the Container Crane Headblock)

  • 조대승
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 1997년도 춘계학술대회논문집; 경주코오롱호텔; 22-23 May 1997
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    • pp.153-159
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    • 1997
  • This paper presents the swing motion analysis of the container crane headblock with the passive control device using hydraulic motors and anti-swing ropes. The device hauls at the headblock to opposite direction of its swing motion using the tension difference between anti-swing ropes connected to the headblock. To consider this control mechanism, the headblock is modelled as the rigid bar suspended by two hoist ropes at the overhead trolley and its non-linear equation of motion is derived using Lagrange's equation. Some numerical experiments using the equation are carried out to investigate the swing motion characteristics of the headblock under the variation of geometric relation among the cargo handling components and to evaluate the performance of the anti-swing device.

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콘테이너 크레인의 헤드블록 횡동요 해석 (Swing Motion Analysis of the Container Crane Headblock)

  • 조대승
    • 소음진동
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    • 제7권5호
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    • pp.765-772
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    • 1997
  • This paper presents the swing motion analysis of the container crane headblock with the passive control device using hydraulic motors and anti-swing ropes. The device hauls at the headblock to opposite direction of its swing motion using the tension difference between anti-swing ropes connected to the headblock. To consider this control mechanism, the headblock is modelled as the rigid bar suspended by two hoist ropes at the overhead trolley and its non-linear equation of motion is derived using Lagrange's equation. Some numerical experiments using the equation are carried out to investigate the swing motion characteristics of the headblock under the variation of geometric relation among the cargo handling components and to evaluate the performance of the anti-swing device.

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수완계 진동 평가에 영향을 미치는 작용력의 측정 (Measurement of Grip and Feed Force in the Evaluation of Hand-arm Vibration)

  • 최석현;장한기
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2003년도 추계학술대회논문집
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    • pp.1038-1042
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    • 2003
  • In order to evaluate dynamic impedance of a hand-arm system it is necessary to measure the hand-transmitted vibration and the reaction force at the same time while gripping the vibrating handle. In the study a device was developed to measure both the vibration and the force. The device consists of a measurement handle with four strain gauge and two accelerometers and a PC based control system with a program for the signal processing and evaluation of the hand-transmitted vibration and reaction force. The handle was installed on the vibration shaker so that it can move by the generated signal from the control system. As an application of the system dynamic reaction force and the frequency weighted acceleration at the handle attached to the shaker were measured at various grip force and feed force. This system will be very useful in the area of impedance measurement and the evaluation of performance of anti-vibration gloves.

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DLP 프로젝터의 소음 저감 연구 (Study on Noise Reduction of DLP Projector)

  • 박대경;장동섭
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2003년도 추계학술대회논문집
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    • pp.132-137
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    • 2003
  • For the evaluation of acoustic noise of a DLP projector, vibration and sound characteristics of a DLP projector were studied. The acoustic noise of DLP projector could be classified into three categories, that is, the direct noise from a body of rotation, the air-bone noise generated from turbulence or vortex occurred during cooling process and the structural born noise produced by vibrating elements. Cooling fans and color filter wheel which rotates at 9000 rpm are main causes of acoustic noise induced in DLP projector. Since the structure of an optical module in a DLP projector can be excited by the excessive vibration of a color filter wheel, the structural design for anti-vibration should be considered. To make a reduction of overall acoustic noise, the anti-vibration design and the enclosing structure have been studied and applied to a color filter wheel.

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압전체 기판에서 에너지 포획된 두께 전단진동의 변위분포 (Particle displacement distributions of energy-trapped thickness shear vibrations in the piezoelectric substrate)

  • 이개명
    • E2M - 전기 전자와 첨단 소재
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    • 제9권9호
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    • pp.954-963
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    • 1996
  • Particle displacement distributions of the fundamental thickness shear vibration mode and overtone modes in an energy-trapped single resonator and an energy-trapped double acoustically coupled filter were calculated. The effects of the width of a pair of partial eletrodes and the magnitude of the plate back of the resonator on the particle displacement distributions of its symmetric vibration mode and anti-symmetric vibration mode were investigated. And the effects of the width of a pair of partial eletrodes, the width of the gap between two pairs of partial electrodes and the magnitude of the plate back of the filter on the particle displacement distributions of its symmetric vibration mode and anti-symmetric vibration mode were investigated.

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가정용 DLP 프로젝터의 소음 저감에 관한 연구 (Study on Noise Reduction of DLP Front Home Theater Projector)

  • 장동섭;박철민;박대경
    • 한국소음진동공학회논문집
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    • 제14권9호
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    • pp.861-867
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    • 2004
  • For the evaluation of acoustic noise of a DLP projector, vibration and sound characteristics of a DLP projector were studied. The acoustic noise of DLP projector could be classified into three categories, that is, the direct noise from a body of rotation, the air-bone noise generated from turbulence or vortex occurred during cooling process and the structural born noise produced by vibrating elements. Cooling fans and color filter wheel which rotates at 9000 rpm are main causes of acoustic noise induced in DLP projector. Since the structure of an optical module in a DLP projector can be excited by the excessive vibration of a color filter wheel, the structural design for anti-vibration should be considered. To make a reduction of overall acoustic noise, the anti-vibration design and the enclosing structure have been studied and applied to a color filter wheel.