• 제목/요약/키워드: continuous joint

검색결과 379건 처리시간 0.027초

파이프 신속결합장치 틈-슬리브에 미치는 응력분포 연구 (A Stress Analysis on the Split-sleeve of Quick Pipe Coupling)

  • 표진수;강진우;최광석;김윤제
    • 한국전산유체공학회:학술대회논문집
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    • 한국전산유체공학회 2008년도 춘계학술대회논문집
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    • pp.502-505
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    • 2008
  • Due to continuous difficulty of human power supply, it is necessary to develop an equipment which is good to saving cost and time at a construction site. A quick pipe coupling method is the kind of mechanical joint system using split-sleeve and sealing-pad at pipe groove without welding. In hence, it provides restrained pipe joint which is simple, safe, and dependable without environmental pollutions. It is more useful scheme than the other ones. The purpose of this study is to find out the main design factors and the optimum shape of split-sleeve. The stress analyses were carried out under various shapes of pipe groove configuration, materials and internal pressures with a commercial software, ANSYS workbench which uses FEM(finite element method). Results are graphically depicted with various parameters.

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기술함수를 이용한 비선형 결합부를 가진 구조물의 진동해석 (Vibration Analysis of Structure with Nonlinear Joint Using Describing Function)

  • 박해성;지태한;박영필
    • 대한기계학회논문집
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    • 제18권2호
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    • pp.372-379
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    • 1994
  • In this study, the describing function is adopted to represent nonlinearity in the system equations. The compliance can be obtained by solving nonlinear simultaneous algebraic quations for multi-degrees-of-freedom system with multinonlinearities. When the technique is applied, the nonlinearity of the system can be identified from the compliance which is obtained from the sinusoidal excitation of the system. By employing the describing function in the Building Block Analysis, we can extensively develop the BBA into investigation of the continuous systems with nonlinearities. The evaluated compliance can quantitatively show the effects of nonlinearity such as the transfer of the natural frequency, the variance of the compliance at the natural frequency, and the jump phenomena which occur during sweeping of the excitation frequency.

온도변화에 따른 무신축이음 강상자형 교량의 거동 분석 (Behavior of Jointless Bridge of Steel Box Girder Type Due to Temperature Change)

  • 조남훈;이성우
    • 한국전산구조공학회:학술대회논문집
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    • 한국전산구조공학회 1997년도 가을 학술발표회 논문집
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    • pp.95-102
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    • 1997
  • Jointless bridge is a new construction method applicable to bridge of short length. In the jointless bridge expansion of superstructure due to thermal effect was absorbed in the flexible pile-type abutment in stead of expansion joint in the conventional bridges. By removing expansion joint, it retards deterioration and extends life time of bridge. In this paper, jointless bridge of steel box girder type was studied through finite element analysis. Stress variations of superstructure and pile due to thermal effect was studied for the two span continuous integral bridge of 80m length and the results of analysis was presented.

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가속도계를 이용한 전동의수의 손목관절 시스템 해석 (Wrist joint analysis of Myoelectronic Hand using Accelerometer)

  • 장대진;김명회;양현석
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2003년도 춘계학술대회논문집
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    • pp.876-881
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    • 2003
  • This study focused on to design and toanalysis of a myoelectronic hand. We considered a low frequency factor in human life and to quantify low frequency which a human body responded to using a 1-axis ant a 3-axis accelerometer. The dynamic myoelectronic hand are important for tasks such a continuous prosthetic control and a EMG signal recognition, which have not been successfully mastered by the most neural approached To control myoelectronic hand, classifying myoelectronic patterns are also important. Experimental results of FEM are 110㎫ on Thumb, 200㎫ on Index finger, 220㎫ on Middle finger 260㎫ on Ring finger and 270㎫ on Little finger. Experimental results of accelerometer are 1.4-0.4(m/s2) ,(5-20(〔Hz〕) in Feeding activity and 0.4-0(m/s2) (0-10〔Hz〕) in Lifting activity. Considering these facts, we suggest a new type myoelectronic hand.

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Harmonic Motion-based Simulator Design for Multipurpose Sports Simulation

  • Yang, Jeong-Yean
    • International journal of advanced smart convergence
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    • 제4권2호
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    • pp.163-169
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    • 2015
  • This study proposes a sports simulation device with various harmonics generation. The proposed system is composed of 6 degrees of freedom simulator devices and three types of sports simulation such as walking, snowboard, and jet-ski. In this research, every joint movement is designed with a crank-and-slider mechanism, which is efficient for generating continuous curvature smoothly. Contrary to the conventional spatial simulator with linear actuators, harmonics generation and its spatial combinations become the crucial issue in this research. The harmonic pattern in each joint is modelled for generating smooth curvatures that are also superposed for achieving overall motions. In addition, the targeted motions of sports simulations have different physical factors of periodic gait motion, frictionless surface, and buoyant effects, which are respectively designed by integrating three dimensional graphics information.

좌측 하지의 관절구축을 동반한 작열통의 치험 (A Case of Causalgia with Contracture Deformity in Lower Extremity)

  • 양승곤;윤덕미;오흥근
    • The Korean Journal of Pain
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    • 제7권1호
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    • pp.96-99
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    • 1994
  • Causalgia is a symptom complex usually consisting of burning pain, hyperesthesia and atrophy of the involved extremity. The pain may be aggravated by contact, motion of extremity or emotional excitement. It occurs following incomplete nerve injury. The patient was a 58-year-old male with a 3-year history of causalgic pain of left lower extremity. He had multiple fractures with degloving injury of left lower extremity in an automobile accident. The pain was exacerbated by movement, and he experienced knee joint and ankle joint contracture. The patient's pain decreased after continuous epidural block with 1% lidocaine and 0.25% bupivacaine. He also received lumbar sympathetic ganglion alcohol block resulting in much improvement of level of pain and walking disturbance.

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강과 스테인레스강 brazing 부의 전단 강도에 미치는 Sn, P의 영향 연구 (Effect of Sn and P on the shear strength of copper to stainless steel brazed joint)

  • 정재필;이보영;강춘식
    • Journal of Welding and Joining
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    • 제7권3호
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    • pp.36-43
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    • 1989
  • The furnace brazing in a Ar of copper to martensitic stainless steel(13.5Cr) using Cu-(5~8%)P-(0~8%)Sn powders was investigated. Shear strength, wettability, reacted layer, defect ratio at the stainless steel interface was evaluated. As Sn was added to the Cu-P powders, defect ratio and P content at the stainless steel interface decreased. And also as Sn was added, defect form at the stainless steel interface changed from the continuous layer to the discrete type, and shear strength of the brazed joint increased.

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손목 스트레칭이 파악력과 근골격계질환에 미치는 영향 (The Effect of Wrist Stretching on Grasping Power and Musculoskeletal Disorders)

  • 유헌종
    • 대한안전경영과학회지
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    • 제24권3호
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    • pp.47-53
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    • 2022
  • In order to conduct a study on the importance of the wrist joint, which causes a lot of pain among middle-aged people, in relation to work related to musculoskeletal disorders, the effect of stretching on grasping power was studied. In order to compare the grasping power of the wrist for middle-aged people in their 50s, the experiment was conducted by comparing before and after the wrist joint motion stretching. According to the experimental results of wrist gripping power for the control group and the experiment group on wrist gripping power, it was investigated that stretching did not change much in increasing wrist gripping power, but stretching application had an effect on wrist gripping power. In terms of preventing musculoskeletal accidents, reducing pain due to degenerative diseases, and preventing accidents, stretching seems to have an effect when approaching, so it is considered that continuous stretching before and after work is necessary. Therefore, it is suggested that stretching time secured quantitatively through safety and health education before work is necessary.

Preparation of a Porous Chitosan/Fibroin-Hydroxyapatite Composite Matrix for Tissue Engineering

  • Kim, Hong-Sung;Kim, Jong-Tae;Jung, Young-Jin;Ryu, Su-Chak;Son, Hong-Joo;Kim, Yong-Gyun
    • Macromolecular Research
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    • 제15권1호
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    • pp.65-73
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    • 2007
  • Chitosan, fibroin, and hydroxyapatite are natural biopolymers and bioceramics that are biocompatible, biodegradable, and resorb able for biomedical applications. The highly porous, chitosan-based, bioceramic hybrid composite, chitosanlfibroin-hydroxyapatite composite, was prepared by a novel method using thermally induced phase separation. The composite had a porosity of more than 94% and exhibited two continuous and different morphologies: an irregularly isotropic pore structure on the surface and a regularly anisotropic multilayered structure in the interior. In addition, the composite was composed of an interconnected open pore structure with a pore size below a few hundred microns. The chemical composition, pore morphology, microstructure, fluid absorptivity, protein permeability, and mechanical strength were investigated according to the composition rate of bioceramics to biopolymers for use in tissue engineering. The incorporation of hydroxyapatite improved the fluid absorptivity, protein permeability, and tenacity of the composite while maintaining high porosity and a suitable microstructure.

Nd:YAG 레이저를 이용한 자동차 배터리용 SS41 다층박판 이종두께 T형상 용접 특성 (T-joint Welding Characteristics of Multi-thin Plate Dissimilar Thickness of SS41 of Automobile Battery by using Nd:YAG Laser)

  • 양윤석;황찬연;유영태
    • 한국정밀공학회지
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    • 제29권10호
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    • pp.1078-1088
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    • 2012
  • In this paper, we present research experimental results about the different thickness T-joint welding of the high power continuous wave(CW) Nd:YAG laser for the secondary battery of a vehicle. Although the conventional method used for the secondary battery is a argon TIG welding, we utilize a laser welding to improve Tungsten Inert Gas(TIG) welding's weakness. The laser, which has a couple of advantage such as aspect ratio, low Heat Affected Zone(HAZ), good welding quality and fast productivity utilized in this work is a CW Nd:YAG laser. In order to observe laser welding sections, we used a optical microscope. Through the analysis of the metallographic, hardness, aspect ratio, and heat input, we obtained the desired data in condition of 1800 W laser beam power and 1.8 m/min and 2.0 m/min laser beam travel speeds. In order to compare electric resistances of the argon TIG welding and laser welding, we made an actual battery and the electric resistance of the laser welding is reduced by 40~45% comparing with the argon TIG welding.