• Title/Summary/Keyword: Joint vibration analysis

Search Result 213, Processing Time 0.028 seconds

Modeling and Vibration Analysis of Steering System (스티어링 시스템의 모델링 및 진동 해석)

  • 조준호;오재응;임동규;강성종;강성종
    • Journal of KSNVE
    • /
    • v.2 no.2
    • /
    • pp.125-134
    • /
    • 1992
  • In this study, ti identify the dynamic characteristics of automobile steering system which consists of many components and joints, each component combined structure was analyzed using commercial structural package, ANSYS. And, the finite element method for each component and modeling method of several joints universal joint, bolt joint, bearing, etc. were studied. On the other hand, the experimental modal analysis was performed to compare with the results of the finite element analysis and joint modeling. The result shows very close agreement between two analysis. Also, it was found that the steeing column used in this experiment does not effect the low frequency mode of entire system. In addition, we found that constraint equations need to be considered in modeling universal joint. Since the stiffness effect of Urethane around wheel could be ignored, it can be modeled only with mass effect. In the end, it was found that dynamic characteristics of the entire steerintg system depends mainly upon the wheel characteristics.

  • PDF

Free vibration analysis of tapered FRP transmission poles with flexible joint by finite element method

  • Saboori, Behnam;Khalili, Seyed Mohammad Reza
    • Structural Engineering and Mechanics
    • /
    • v.42 no.3
    • /
    • pp.409-424
    • /
    • 2012
  • Since relatively low elasticity modulus of the FRP materials results in lower natural frequencies, it is necessary to study the free vibration of FRP transmission poles. In this paper, the free vibration of tapered FRP transmission poles with thin-walled circular cross-section is investigated by a tapered beam element. To model the flexible joints of the modular poles, a rotational spring model is used. Modal analysis is performed for typical FRP poles with/without joint and they are also modeled by ANSYS commercial finite element software. There is a good correlation between the results of the tapered beam finite element model and those obtained from ANSYS as well as the existing experimental results. The effects of different geometries, material lay-ups, concentrated masses at the pole tip, and joint flexibilities are evaluated. Moreover, it is concluded that using tougher fibres at the inner and outer layers of the cross-section, results in higher natural frequencies, significantly.

Vibration analysis of 2300 TEU container ship using power flow analysis program in medium-to-high frequency ranges (파워흐름해석 프로그램을 이용한 2300 TEU 컨테이너선의 중고주파 대역 진동해석)

  • 서성훈;박영호;홍석윤;길현권
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2001.11b
    • /
    • pp.1061-1066
    • /
    • 2001
  • To predict vibrational energy density and intensity of beam-plate coupled complex structures in medium-to-high frequency ranges, Power Flow Finite Element Method(PFFEM) programs for plate, beam and some coupled structural elements are developed. The flexural, longitudinal and shear waves in plates are formulated and the joint element equations for multi-couped plates are fully developed. Also the wave transmission approach has been introduced to cover the energy transmission and reflection at the joint elements. Using the developed PFFEM program, vibration analysis for 2300TEU container ship model is performed and here the model data for this program are obtained by converting fonner FE model for structural analysis. This program predicts successfully the vibrational energy density and intensity upto 8,000 Hz for the ship model with over 50,000 DOF.

  • PDF

Technology for Initial Design and Analysis of Vehicle Pillar Structures for Vibration (저진동 차체의 필라 설계 및 최전화 기법)

  • 임홍재;이상범
    • Journal of KSNVE
    • /
    • v.5 no.3
    • /
    • pp.395-402
    • /
    • 1995
  • In general low frequency vibration characteristics like an idleshake is mainly influeced by pillar section properties and joints. So the design technique development of vehicle pillar structures is required to initial design and vehicle development stage. In this paper to develop pillar structure design technique considering low frequency vibration characteristics, strain energy method, design sensitivity analysis method, and design optimization method using commercial finite element analysis program and optimization program are presented.

  • PDF

Free Vibration Analysis of a T Joint Using Thin-Walled Beam and Shell Elements (박판보 요소와 셸 요소를 이용한 T 조인트 진동 해석)

  • Kim, Jin-Hong;Kim, Hyeon-Seok;Kim, Yun-Yeong
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.24 no.9 s.180
    • /
    • pp.2334-2343
    • /
    • 2000
  • This paper proposes an efficient beam-shell modeling technique for the free vibration analysis of a T-joint thin-walled beam structure. Except a small portion of a T-joint which is modeled by shell elements, the structure is modeled by thin-walled beam elements that can describe warping and distortion. In order to match the shell and thin-walled beam elements at the interface of the dissimilar elements, a technique based on a pseudo inverse matrix is formulated. This paper also examines the role of the thin-walled element taking into account the distortion and warping deformation degrees of freedom in predicting accurately the dynamic characteristics of a T-joint thin-walled structure.

Transient Response Analysis of a Comb Type Bridge Expansion Joint due to Travelling Wheel Impact (차륜주행충격에 의한 빗살형 교량 신축이음장치 구조물의 과도진동해석)

  • 최영휴;김현욱;안영덕
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 1997.04a
    • /
    • pp.69-74
    • /
    • 1997
  • In this paper we derive relations which describe the geometry and kinematics of contact between the travelling wheel and stepped comb joint. From which we can obtain the impulse, impulsive force and its time interval due to travelling wheel impact which can not be taken from Carter's model or Newland and Cassidy's. The calculated transient responses of the comb joint structure to travelling wheel impact reveals that the proposed wheel contact model and Carter's give very similar results but Newland Cassidy's model make a quite different results from the others.

  • PDF

Development of Compliant and Dissipative Joints in Coupled Thin Plates for Vibrational Energy Flow Analysis (평판 구조물의 진동 파워흐름해석을 위한 비보존 조인트 개발)

  • Song, Jee-Hun;Hong, Suk-Yoon
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.18 no.10
    • /
    • pp.1082-1090
    • /
    • 2008
  • In this paper, a general solution for the vibrational energy and intensity distribution through a compliant and dissipative joint between plate structures is derived on the basis of energy flow analysis (EFA). The joints are modeled by four sets of springs and dashpots to show their compliancy and dissipation in all four degrees of freedom. First, for the EFA, the power transmission and reflection coefficients for the joint on coupled plate structures connected at arbitrary angles were derived by the wave transmission approach. In numerical applications, EFA is performed using the derived coefficients for coupled plate structures under various joint properties, excitation frequencies, coupling angles, and internal loss factors. Numerical results of the vibrational energy distribution showed that the developed compliant and dissipative joint model successfully predicted the joint characteristics of practical structures vibrating in the medium-to-high frequency ranges. Moreover, the intensity distribution of a compliant and dissipative joint is described.

Application of High Damping Alloys for Vibration Reduction in Bridge Expansion Joints (Fe-Mn 제진합금을 적용한 교량용 신축이음장치의 진동저감 효과에 관한 연구)

  • Kim, T.H.;Baik, J.H.;Han, D.W.;Kim, J.C.;Baik, S.H.;Yoo, M.S.
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2006.05a
    • /
    • pp.1019-1023
    • /
    • 2006
  • Conventional methods for reducing vibration in engineering designs may be undesirable in conditions where size or weight must be minimized, or where complex vibration spectra exist. Fe-Mn Damping alloy with a combination of high damping capacity and good mechanical properties can provide attractive technical and economical solutions to problems involving seismic, shock and vibration isolation. We have studied the noise and vibration characteristic of Dampalloy and checked Dampalloy reduced noise about 3.9dB and vibration about 15.9 times as compared conventional material through laboratory research. With this result, we obtained a good possibility of material substitution about the bridge expansion joint

  • PDF

Evaluation of TMJ sound on the subject with TMJ disorder by Joint Vibration Analysis

  • Hwang, In-Taek;Jung, Da-Un;Lee, Jae-Hoon;Kang, Dong-Wan
    • The Journal of Advanced Prosthodontics
    • /
    • v.1 no.1
    • /
    • pp.26-30
    • /
    • 2009
  • STATEMENT OF PROBLEM. Qualitative and semi-quantitative methods have been developed for TMJ sound classification, but the criteria presented are completely inhomogeneous. Thus, to develop more objective criteria for defining TMJ sounds, electroacoustical systems have been developed. We used Joint vibration analysis in the BioPAK system(Bioresearch Inc., Milwaukee, USA) as the electrovibratography. PURPOSE. The aim of this study was to examine the TMJ sounds with repect to frequency spectra patterns and the integral > 300 Hz /< 300 Hz ratios via six-months follow-up. MATERIAL AND METHODS. This study was done before and after the six-months recordings with 20 dental school students showed anterior disk displacement with reduction. Joint vibrations were analyzed using a mathematical technique known as the Fast Fourier Transform. RESULTS. In this study Group I and Group II showed varied integral > 300 /< 300 ratios before and after the six-months recordings. Also, by the comparative study between the integral > 300 /< 300 ratios and the frequency spectrums, it was conceivable that the frequency spectrums showed similar patterns at the same location that the joint sound occurred before and after the six-months recordings. while the frequency spectrums showed varied patterns at the different locations that the joint sound occurred before and after six-month recordings, it would possibly be due to the differences in the degree of internal derangement and/or in the shape of the disc. CONCLUSIONS. It is suggested that clinicians consider the integral > 300 /< 300 ratios as well as the frequency spectrums to decide the starting-point of the treatment for TMJ sounds.

Dynamic Characteristics of Bolted Joint in Tube Line by External Vibration (외부 가진을 받는 관로계에서 볼트 결합부의 동특성)

  • Park, T.W.;Kim, Y.K.;Shin, G.S.
    • Journal of Power System Engineering
    • /
    • v.5 no.4
    • /
    • pp.38-43
    • /
    • 2001
  • This paper describes the effect of dynamic characteristics in tube line by external vibration conveying fluid with the power steering system. By the experimental analysis we found out that the factor of system vibration is the fluid-structure interaction of tube line. In fluid-filled tube system we study on the influence that the natural frequency of system and the frequency of wave motion produce upon through experiment. Experiments are modal test, frequency response function in continuous system, and vibrating tests when the system is driving with bolted clamping joint condition. From the results of the experimental studies, we obtained that the natural frequencies of system are very important than the wave induced vibrations. And we found that the tendency of system vibration level was decreased by bolting force, bolting condition and clamping distance.

  • PDF