• Title/Summary/Keyword: Tubular Joint

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Development Technique of Tubular Shaft for Reduction of Booming Noise in Vehicle Interior Caused by Drive Shaft (구동축과 연관된 차량의 부밍 소음 저감을 위한 중공축 개발 기법)

  • Ko, Kang-Ho;Choi, Hyun-Joon;Kim, Young-Ho
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2000.11a
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    • pp.187-193
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    • 2000
  • In order to reduce the booming noise caused by first bending mode of drive shaft, this paper proposes a simulation program for prediction of the bending mode frequency of any tubular shaft. This program consists of a pre-processor for modeling of geometrical shape of drive shaft and applying the boundary conditions of various joints, a processor for constructing of global finite element matrices using beam elements and an eigen-solver based on MATLAB program. Using this simulation program, the effective and accurate FE model for a shaft attached in vehicle can be obtained by aid of database for stiffness of each joint. Thus the resonance frequencies and mode shapes of a shaft can be calculated accurately. Because the effect of the resonance on interior noise can be verified, more improved shaft can be proposed at the early stage of design.

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Prediction of the Torque Capacity for Tubular Adhesive Joints with Composite Adherends (복합재료 접착체를 가지는 튜브형 접합부의 토크전달능력 예측)

  • Oh, Je-Hoon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.30 no.12 s.255
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    • pp.1543-1550
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    • 2006
  • Since the performance of joints usually determines the structural efficiency of composite structures, an extensive knowledge of the behavior of adhesive joints and the related effect on joint strength is essential for design purposes. In this study, the torque capacity of adhesive joints was predicted using the combined thermal and mechanical analyses when the adherend was a composite tube. A finite element analysis was performed to evaluate residual thermal stresses developed in the joint, and mechanical s stresses in the adhesive were calculated including both the nonlinear adhesive behavior and the behavior of composite tubes. Three different joint failure modes were considered to predict joint failure: interfacial failure, adhesive bulk failure, and adherend failure. The influence of the composite adherend stacking angle on the residual thermal stresses was investigated, and how the residual thermal stresses affect the joint strength was also discussed. Finally, the predicted results were compared with experimental results available in literature.

Strength Evaluation of T-type Tubular Joints for Circular Section Multi-Column Wind Towers (원형단면 멀티기둥 풍력타워 적용 T형 강관조인트 강도 평가)

  • Kim, Kyung Sik;Park, Hyun Yong;Seo, Dong Hyuck
    • Journal of Korean Society of Steel Construction
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    • v.27 no.1
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    • pp.119-129
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    • 2015
  • Due to reduced self weight and alleviated wind effect, the multi-column wind towers that consist of a number of circular tubes as vertical members interconnected with horizontal brace members can be a substitute for the large-scale single cylinder wind towers. It is critical to guarantee strengths of tubular joints where vertical and horizontal members are structurally connected in order to make the whole multi-column system behave as a single tower structure. In this study, strength evaluation has been conducted for T-type tubular joints that are applicable in multi-column towers. Four of available design codes, i.e., AISC, Eurocode3, ISO 19902, CIDECT have been investigated and predictor equations in the considered design codes were validated and discussed through parametric numerical study on slenderness ratios of chords and braces at joints.

Development of Ultralight Composite Wheelchair Frame (초경량 복합재 의자차 차체 개발)

  • 강지호;김수현;김천곤
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2002.05a
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    • pp.215-218
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    • 2002
  • In this paper, we applied composite material of high specific stiffness and strength to the fabrication of a folding wheelchair frame for the replacement of conventional metal wheelchair frames. A one-body composite frame was designed and the finite element analysis was performed on this design. Some specimens of joint parts were manufactured and strength test was done. With the results of analysis and test, some modification was done and a prototype was produced.

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유한요소법에 의한 Adhesive Bonded 복합재료 Lap Joint 의 해석

  • 김원태;김기수;이대길
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.10a
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    • pp.111-115
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    • 2001
  • The stress and torque transmission capability of the tubular, hexagonal and elliptic single lap joints were analyzed by the finite element method (ANSYS 4.4A) and compared to those with the experimental results. The adherends of the joints were composed of the carbon fiber epoxy composite shafts and the steel shafts. In calculating the torque capability, the linear laminate (smeared) properties of the composite and the nonlinear shear properties of the adhesive were used. The experiments revealed that the torque capability calculation performed by this method gave accurate results.

A Case of Infantile Nephrotic Syndrome (부신 석회화가 동반된 영아형 신증후군)

  • Lee, Kyung-A;Shin, Son-Mun;Park, Yong-Hoon
    • Journal of Yeungnam Medical Science
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    • v.9 no.2
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    • pp.427-435
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    • 1992
  • We have experienced a case of infantile nephrotic syndrome confirmed by renal biopsy in a 13-month-old female patient who showed growth and develop mental retardation and persistent proteinuria. She revealed mild eyelid edema, joint laxity, delayed speech development and adrenal cortical calcification on the radiologic study. Renal biopsy showed microcystic tubular change, micro-glomeruli and marked mesangial proliferation.

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Outrigger Systems for Tall Buildings in Korea

  • Chung, Kwangryang;Sunu, Wonil
    • International Journal of High-Rise Buildings
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    • v.4 no.3
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    • pp.209-217
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    • 2015
  • Outrigger systems are highly efficient since they utilize the perimeter zone to resist lateral forces, similar to tubular systems. The entire structural weight can be reduced due to the system's significant lateral strength. Therefore, it is the most commonly selected structural system for tall and supertall buildings built in recent years. In this paper, issues regarding the differential shortening effect during construction of the outrigger system and the special joints used to solve these issues will be addressed. Additionally, the characteristics of wind and seismic loads in Korea will be briefly discussed. Lastly, buildings in Korea using an outrigger as their major structural system will be introduced and the structural role of the system will be analyzed.

Hysteresis modeling for cyclic behavior of concrete-steel composite joints using modified CSO

  • Yu, Yang;Samali, Bijan;Zhang, Chunwei;Askari, Mohsen
    • Steel and Composite Structures
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    • v.33 no.2
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    • pp.277-298
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    • 2019
  • Concrete filled steel tubular (CFST) column joints with composite beams have been widely used as lateral loading resisting elements in civil infrastructure. To better utilize these innovative joints for the application of structural seismic design and analysis, it is of great importance to investigate the dynamic behavior of the joint under cyclic loading. With this aim in mind, a novel phenomenal model has been put forward in this paper, in which a Bouc-Wen hysteresis component is employed to portray the strength and stiffness deterioration phenomenon caused by increment of loading cycle. Then, a modified chicken swarm optimization algorithm was used to estimate the optimal model parameters via solving a global minimum optimization problem. Finally, the experimental data tested from five specimens subjected to cyclic loadings were used to validate the performance of the proposed model. The results effectively demonstrate that the proposed model is an easy and more realistic tool that can be used for the pre-design of CFST column joints with reduced beam section (RBS) composite beams.

Optimum topology design of geometrically nonlinear suspended domes using ECBO

  • Kaveh, A.;Rezaei, M.
    • Structural Engineering and Mechanics
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    • v.56 no.4
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    • pp.667-694
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    • 2015
  • The suspended dome system is a new structural form that has become popular in the construction of long-span roof structures. Suspended dome is a kind of new pre-stressed space grid structure that has complex mechanical characteristics. In this paper, an optimum topology design algorithm is performed using the enhanced colliding bodies optimization (ECBO) method. The length of the strut, the cable initial strain, the cross-sectional area of the cables and the cross-sectional size of steel elements are adopted as design variables and the minimum volume of each dome is taken as the objective function. The topology optimization on lamella dome is performed by considering the type of the joint connections to determine the optimum number of rings, the optimum number of joints in each ring, the optimum height of crown and tubular sections of these domes. A simple procedure is provided to determine the configuration of the dome. This procedure includes calculating the joint coordinates and steel elements and cables constructions. The design constraints are implemented according to the provision of LRFD-AISC (Load and Resistance Factor Design-American Institute of Steel Constitution). This paper explores the efficiency of lamella dome with pin-joint and rigid-joint connections and compares them to investigate the performance of these domes under wind (according to the ASCE 7-05), dead and snow loading conditions. Then, a suspended dome with pin-joint single-layer reticulated shell and a suspended dome with rigid-joint single-layer reticulated shell are discussed. Optimization is performed via ECBO algorithm to demonstrate the effectiveness and robustness of the ECBO in creating optimal design for suspended domes.

Effect of local joint flexibility on the fatigue lfe assessment of jacket-type offshore platform

  • Behrouz Asgarian;Parviz Kuzehgar;Pooya Rezadoost
    • Ocean Systems Engineering
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    • v.14 no.1
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    • pp.1-16
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    • 2024
  • This paper investigates the impact of local joint flexibility (LJF) on the fatigue life of jacket-type offshore platforms. Four sample platforms with varying geometric properties are modeled and analyzed using the Opensees software. The analysis considers the LJF of tubular joints through the equivalent element and flexible link approaches, and the results are compared to rigid modeling. Initially, modal analysis is conducted to examine the influence of LJF on the frequency content of the structure. Subsequently, fatigue analysis is performed to evaluate the fatigue life of the joints. The comparison of fatigue life reveals that incorporating LJF leads to reduced fatigue damage and a significant increase in the longevity of the joints in the studied platforms. Moreover, as the platform height increases, the effect of LJF on fatigue damage becomes more pronounced. In conclusion, considering LJF in fatigue analysis provides more accurate results compared to conventional methods. Therefore, it is essential to incorporate the effects of LJF in the analysis and design of offshore jacket platforms to ensure their structural integrity and longevity.