• Title, Summary, Keyword: Vibration Reduction

Search Result 2,227, Processing Time 0.055 seconds

Vibration Characteristics Analysis of Reduction Unit for Railway Vehicles (국내 철도차량 감속기 진동특성분석)

  • Ji, Hae-Young;Kim, Jae-Chul;Lee, Dong-Hyung;Moon, Kyung-Ho;Lee, Kang-Ho
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • /
    • pp.169-174
    • /
    • 2012
  • Reduction unit is one of the most important components for railway vehicle because torque of motor must be transmitted to wheels of vehicle by reduction unit. However, According to advanced studies, it has been often broke down due to the damage, fatigue and wear of gear. To solve this problem, defect diagnosis methods of gear have been mainly using the vibration diagnosis technology through vibration waveform and frequency analysis. However, We should know vibration characteristics of normal state reduction unit prior to defect diagnosis. So in this paper, We had analyzed vibration characteristics of reduction unit in order to utilize monitoring system development. Comparison of targets is the vibration characteristics of normal state reduction unit about Electric Multiple Unit(EMU) and the High-speed trains(KTX, KTX II).

  • PDF

Damping Properties of the Spray Type Vibration Reduction Material for the Use of the Automotive Interior Parts (자동차 내장용 분무형 제진재의 제진특성)

  • 윤주호;윤여성;김영명;김의용;김종수
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.10 no.5
    • /
    • pp.138-146
    • /
    • 2002
  • The new type of vibration reduction material far an automotive interior, which is spray-type liquid material, is developed in this study The new material has better damping property and lower mass density than other damping materials, for example asphalt sheet. It can be sprayed by an automatic robot, so it is expected to improve productivity and cut down manpower. And it solves a poor adhesion problem and makes an automotive to be lightweight by optimizing spray process. So, It is a next generation automotive vibration reduction material. In this paper, the chemical process for making the new damping materials is described. And then, the damping properties of the vibration reduction materials are analyzed by modal testing of damping treatment specimens. The new vibration reduction materials have good damping properties than asphalt sheet in the experimental results.

Vibration reduction in a Hull mount using the ER inserts (ER인서트를 이용한 Hull Mount에서의 진동저감에 관한 연구)

  • Kim, Ji-Seon;Kim, Jae-Hwan;Park, Seung-Bok;Kim, Kung-Su
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • /
    • pp.348.1-348
    • /
    • 2002
  • This paper deals with the vibration reduction of the hull mount system of ship structures brought by ER smart structures. The hull mount is used to isolate the vibration form the immersed structures. Utilizing the tunable characteristics of ER fluids, ER insert are made In the hull mountint structure. Different types of ER inserts are proposed and the vibration characteristics are investigated. (omitted)

  • PDF

Reduction Effect of Railroad Vibration by Utilizing Waste Tires (폐타이어의 철도진동 저감효과에 대한 실험적 연구)

  • Kim, Jin-Man;Lee, Kwang-Wu;Cho, Sam-Deok;Oh, Se-Yong
    • Journal of the Korean Society of Environmental Restoration Technology
    • /
    • v.9 no.1
    • /
    • pp.31-40
    • /
    • 2006
  • This paper describes the results of a series of field experiments which are carried out to assess the reduction effect of railroad vibration by utilizing waste tires. The ground vibration due to train service is measured in Honam Railroad line and Kyongbu Railroad line to assess the ground vibration with the domestic railroad line and train type before field model test. From the results of these tests, frequency on train service is presented from 5Hz to 100Hz and a range of excellence frequency is presented to be about from 20Hz to 40Hz in the domestic railroad line. Also, plate bearing tests are conducted to evaluate the variation of bearing capacity with different thickness of the waste tire layer and the fill layer. Finally, field model test is performed by using tire chips ($5cm{\times}5cm$ in size) as a reduction material of railroad vibration. The reduction effect of railroad vibration by utilizing waste tires increases with increasing the thickness of the waste tire layer and the frequency of the vibration source. The results of this experimental study was shown that the waste tire can be used for reduction of the railroad vibration.

Characteristics of Shear-Thinning Fluid Viscosity under Traversal Vibration (진동장에서의 전단박화 유체 점도의 특성 연구)

  • Ku Yun-Hee;Lee Ji-Hyung;Shin Sehyun
    • Proceedings of the KSME Conference
    • /
    • /
    • pp.317-320
    • /
    • 2002
  • The effect of vibration on the viscosity of a shear-thinning fluid was investigated with a newly designed pressure-scanning capillary viscometer. The viscometer was designed to measure non-Newtonian viscosity continuously over a range of shear rates at a time. Low frequency vibration was applied perpendicularly to the direction of the flow. The effect of the transversal vibration was investigated for both Newtonian fluids and non-Newtonian fluids. The experimental results showed that the vibration had no effect on the viscosity of the Newtonian fluids. However, the vibration caused a significant reduction of the shear-thinning fluid viscosity. The viscosity reduction was strongly dependent on both vibration frequency and shear rate. In addition, the viscosity reduction was affected by the amplitude of vibration, and, the bigger amplitude applied, the more viscosity reduction occurred.

  • PDF

A Case of Blasting Vibration Reduction in the Tunnel Construction under a Residential Area (주거지역 터널공사에서의 발파진동 저감사례)

  • Kang, Jin-Ook;Lee, Hyun-Koo;Lee, Myong-Choul
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • /
    • pp.175-180
    • /
    • 2007
  • This paper presents a case study on blasting vibration reduction in NATM(New Australian Tunnelling Method) tunnel construction carried out under a congested residential area. In NATM tunnel constructions, blasting is an essential process, thus vibration phenomenon is inevitable. Therefore, the vibration reduction was tried to avoid expected complaints from the public living in the area. Test blastings were performed to get the constants for an estimation formula of vibration velocity. Then the influence area was approximated using the estimation formula, and construction methods for the vibration reduction were sought based on the results.

  • PDF

Numerical Analysis Study on Damping Performance of Cable Damper (케이블댐퍼 감쇠성능의 수치해석적 연구)

  • Yhim, Sung-Soon
    • Journal of the Korean Society for Advanced Composite Structures
    • /
    • v.6 no.2
    • /
    • pp.97-104
    • /
    • 2015
  • Compared with a strong axial rigidity due to large intial tension, cable has a weak laterally flexural rigidity. A variety of dynamic loads such as traffic loads and wind loads etc. cause the cables to vibrate significantly and affect the mechanical properties and the performance of cables. Therefore, vibration reduction design is an urgent task to control the vibration of cable-supported bridges. Because a various kind of dampers have shown to reduce the amplitude and duration time of vibration of cable from measured date in field test, damper can be considered that it is effective device significantly to reduce the amplitude and duration time in vibration of cable. Vibration characteristics of cable can change according to manufacturing method and type of established form, and damper has been designed according to distribution of natural frequencies and vibration modes. In this study, numerical analysis is used to show the reduction effects of vibrations and present the design of damper for vibration reduction of cable.

A Study of Industrial Robot for the Noise and the Vibration Reduction (산업용 로봇의 소음/진동 저감 연구)

  • Lee, Kwangyal;Jintai Chung;Duhan Jung;Yim, Hueng-Soon;Kim, Young-Hwin
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • /
    • pp.321.1-321
    • /
    • 2002
  • The object of this study is an examination of source of robot noise and reduction of the noise and the vibration for an industrial robot system. As the frist step in our study, the noise and the vibration from the robot are measured by microphones and by accelerometers and the source of the noise and the vibration are proved to be from the gear, shaft, and housing from the experiments. The occurrence of the noise may be classified according into kinds, Finally base on the result of the experiments, we consider a countermeasure fur reducing the noise and the vibration of robot system by the parametric study.

  • PDF

A Study of Industrial Robot for the Noise and the Vibration Reduction (산업용 로봇의 소음/진동 저감 연구)

  • Lee, Kwang-Yal;Chung, Jin-Tai;Jung, Du-Han;Yim, Heung-Soon;Kim, Young-Hwan
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • /
    • pp.146-151
    • /
    • 2002
  • The object of this study is an examination of source of robot noise and reduction of the noise and the vibration for an industrial robot system. As the first step in our study, the noise and the vibration from the robot are measured by microphones and by accelerometers and the source of the noise and the vibration are proved to be from the gear, shaft, and housing from the experiments. The occurrence of the noise may be classified according into kinds, Finally base on the result of the experiments, we consider a countermeasure for reducing the noise and the vibration of robot system by the parametric study.

  • PDF

Vibration reduction in a Hull mount using the ER inserts (ER 인서트를 이용한 Hull Mount 에서의 진동저감에 관한 연구)

  • Kim, Ji-Seon;Kim, Jae-Hwan;Choi, Seung-Bok;Kim, Kung-Su
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • /
    • pp.453-458
    • /
    • 2002
  • This paper deals with the vibration reduction of hull mount system of ship structures brought by ER smart structures. The hull mount is used to isolate the vibration of equipment from the host structures. Utilizing the tunable characteristics of ER fluids, ER inserts are made in the hull mount structure. Different types of ER inserts are proposed and the vibration characteristics are investigated. A hull mount structure is made and the influence of ER inserts are experimentally studied. An extensive modal test is empirically conducted to identify natural frequencies and mode shapes according to the applied electric field and the types of ER insert. The frequency tunable characteristics of ER inserts can be applied to many mounting structures for vibration reduction.

  • PDF