• Title, Summary, Keyword: Tension

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The Type of Composition and Classification of Tension Structure Systems in Architecture (건축 인장구조시스템의 분류와 구성유형)

  • Lee, Ju-Na;Park, Sun-Woo;Park, Chan-Soo
    • Journal of the Korean Association for Spatial Structures
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    • v.3 no.3
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    • pp.111-120
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    • 2003
  • Tension members is a type of effective structural member, which is often used in large span structures. The structure systems composed with tension members are combined in various way and specific formations. So, there are need to research into the formations of tension structure and the type of adaptation in tension structure architectures. The structure systems with tension members were considered as tension main system, vector system and tension supported bending system, comprehensively. And tension structures were classified into the formation of tension structure with uniaxial or multiaxial line tension member, with surface member, with hybrid member of line and surface, concerning the flow of tension force. In each the formation of tension structure, the typical adaptations to architecture were also investigated through architecture examples. The type of the formation can be used to plan an architecture with respect to the flow of tension force and structural feature.

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Strip Tension Control Considering the Temperature Change in Multi-Span Systems

  • Lee Chang Woo;Shin Kee Hyun
    • Journal of Mechanical Science and Technology
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    • v.19 no.4
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    • pp.958-967
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    • 2005
  • The mathematical model for tension behaviors of a moving web by Shin (2000) is extended to the tension model considering the thermal strain due to temperature variation in furnace. The extended model includes the terms that take into account the effect of the change of the Young's Modulus, the thermal coefficient, and the thermal strain on the variation of strip tension. Computer simulation study proved that the extended tension model could be used to analyze tension behaviors even when the strip goes through temperature variation. By using the extended tension model, a new tension control method is suggested in this paper. The key factors of suggested tension control method include that the thermal strain of strip could be compensated by using the velocity adjustment of the helper-rollers. The computer simulation was carried out to confirm the performance of the suggested tension control method. Simulation results show that the suggested tension control logic not only overcomes the problem of the traditional tension control logic, but also improves the performance of tension control in a furnace of the CAL (Continuous Annealing Line).

Tesion Control of Unwinder/Winder using a Tension Observer (장력 관측기를 이용한 풀림롤/감김롤의 장력제어)

  • Song, Seung-Ho;Seol, Seung-Gi
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.49 no.1
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    • pp.62-69
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    • 2000
  • The strip tension as well as the line speed should be controlled tightly for the quality of products and productivity of the continuous strip processing line. In this paper, a new tension control algorithm with tension observer is proposed using observed tension as regulator feedback. The tension observer is based on the torque balance of a roller stand including the acceleration torque. Using this estimated tension, new tension controller can be constructed with faster dynamic response in case of line speed acceleration or deceleration. The proposed scheme needs no additional hardware because the inputs of observer, current and speed, are already being monitored by the motor drive system. Through the simulations and experiments with laboratory set up, performances fo conventional schemes and proposed one are compared. The results show the effectiveness of the proposed tension controller.

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Failure Behavior and Tension Stiffening of RC Tension Members (철근콘크리트 인장부재의 인장강성 및 파괴거동에 관한 연구)

  • 박제선;이봉학;윤경구;홍창우;이주형
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.737-742
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    • 1998
  • The tension stiffening effect is defined as the increase in stiffness in reinforced concrete member due to the stiffness provided by concrete between cracks. If this is disregarded in analysis of reinforced concrete members, especially at the level of service loads, member stiffnesses may be underestimated considerably. This paper presents on the failure behavior and tension stiffening of RC tension test with main variables such as concrete strength, rebar diameter and strength. The tension stiffening was analyzed from the load-displacement relationship by ACI code and the proposed by Collins & Mitchell. In summary, the effect of tension stiffening decrease rapidly as the rebar diameter increase, rebar strength increase, and concrete strength increase. The effect of tension stiffening on RC member is the biggest near the behavior of concrete cracking and decrease as the load close to the breaking point. Thus, the tension stiffening should be considered for the precise analysis near the load of concrete cracking.

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A Study on the Development of Non-contact Type Tension Detecting System(II) -Detection of Yarn Tension in Ring Spinning Process- (비접촉식 장력계측장치의 개발에 관한 연구(II)-방적중인 실의 장력변동 계측-)

  • 장승호;송원규
    • Textile Science and Engineering
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    • v.38 no.8
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    • pp.389-394
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    • 2001
  • It is very important to measure the yarn tension in the textile process for improving the productivity. The contact type tension detection systems have been widely used in the textile industry until now. However, these kinds of conventional contact type tension detectors have a friction problem between detector and yarn. the objective of this study is to develop a noncontact type tension detecting system in spinning process. In this paper a system to convert the frequency of yarn to the tension was devised by inducing an equation between frequency and yarn tension from the wave equation. The frequency of yarn was measured with the optical fiber sensor, and from this frequency the yarn tension was obtained using the induced equation. The validity of the non-contact type tension detection system was verified by the experiments.

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Effect of Tension, Compression Lamination and Number of Lamination on the Flexural Properties of Platanus occidentalis L. Laminated Beam (인장(引張) 및 압축부재(壓縮部材)와 적층수(積層數)가 플라타너스 집성재(集成材)의 휨성질(性質)에 미치는 영향(影響))

  • Oh, Se-Chang;Lee, Phil-Woo
    • Journal of the Korean Wood Science and Technology
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    • v.14 no.2
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    • pp.3-12
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    • 1986
  • The aim of this study is to determine the flexural properties(Modulus of Rupture, Modulus of Elasticity) of Platanus occidentalis L. laminated beams fabricated with 1, 3, 5, 8, 15 lamination and Tension, Compression lamination. The results were as follows: 1. MOR increased with increasing number of lamination in 3, 5, 8, 15-beam and Tension lamination beam. MOR of Compression lamination beam was lower than that of 3-beam, MOR of vertical beam not having Tension or compression lamination was lower than that of horizontal beam, but MOR of vertical beam with tension or compression lamination was same or slightly higher than that of horizontal beam. 2. The allowable working stress showed the same tendency. This stress increased with increasing number of lamination. This value of Tension lamination beam was higher than that of compression lamination beam. 3. MOE of all laminated beams was higher than that of solid beam and Tension lamination beam was higher than that of 3-beam. MOE of Tension lamination beam was higher than that of Compression lamination beam. MOE of all vertical beam was higher than that of horizontal beam except for T-2, T-5, C-3. 4. Most beam failures appeared to begin in tension. These tension failures were classified into Splintering tension, Cross-grained tension, Simple tension, Brittle tension. All test beam failures could be classified into three categories. 1) Tension failure 2) Compression failure 3) Horizontal shear failure.

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Experimental Study and Evaluation of Tension Stiffening Model in High Strength Concrete Beams (고강도 콘크리트 보에서 Tension Stiffening 모델을 이용한 실험적 연구 및 평가)

  • Shin, Dae Hwan;Jo, Eunsun;Kim, Min Sook;Kim, Heechuel;Lee, Young Hak
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.27 no.1
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    • pp.45-53
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    • 2014
  • In strength limit states design, it is assumed that after cracking, reinforcement carries all tension in the tension zone of reinforced concrete members. However, it can be seen the concrete between cracks will contribute to carrying a part of the tension stress in actual concrete members particularly at service load levels, this effect is referred as tension stiffening effect. In this study, tension stiffening models and high strength concrete beam flexural test results were verified through comparison. The relationship between moment-curvature and load-deflection was evaluated by result of tension stiffening model and test result values. The analysis results showed that ACI 318 and Owen & Damjanic generally shows good agreement.

Technique of Tension Length Calculation for 350km/h High Speed Catenary System (최고운행속도 350km/h급 전차선로 장력구간길이 계산 기법)

  • Chang, Sang-Hoon;Lee, Ki-Won;Kwon, Sam-Young;Park, Jae-Woong
    • Proceedings of the KSR Conference
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    • pp.932-939
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    • 2011
  • This paper deal with technique of tension length calculation for 350km/h high speed catenary system. Tension length affects in facility investment. Possibility of overlap increasing a tension length and the equipment investor decreases in order to decrease. Considers the parameter which specifies and the grudge which is possible long the fact that decides a tension length is the aim which is important plans overhead contact line. The element which decides a tension length with next following; (i) Operating range of tension device, (ii) Change of the horizontal tension which affects possibility of the effect which operates to the line and span, (iii) Tension of wire material the tensile force which is relation, (iv) Wire thermal expantion which relates with a standard temperature, (v) Curve radius, (vi) Wind velocity, (vii) Thermal range of overhead contact wire and mechanical design of tension mechanism etc.

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Tension Estimation of Interstand Strip in Looperless Hot Rolling Process Using SVR (SVR을 이용한 Looperless 열연 공정에서의 스텐드간 장력 추정)

  • Han, Dong-Chang;Shim, Jun-Hong;Park, Cheol-Jae;Park, Hae-Doo;Lee, Suk-Gyu
    • Journal of Institute of Control, Robotics and Systems
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    • v.13 no.10
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    • pp.1007-1011
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    • 2007
  • This paper proposes a novel tension estimation of interstand strip in looperless hot rolling process using SVR(Support Vector Regression). The quality of hot coil which is final product of hot rolling process is substantially decided by tension control of finishing rolling in hot rolling process. The fluctuation of the strip tension in conventional hot rolling process is controlled by the strip tension measured by an inter-stand looper. However, the looper can cause a motor trip and tension hunting in hot rolling process, therefore, alternative method is essential to replace it. In this paper, the mathematical modeling of tension mechanism is implemented to estimate the tension using the proposed SVR algorithm without looper in hot rolling process. The simulation results show a reliable estimation performance and a possibility of tension control using SVR technique.

Control of Longitudinal Tension and Lateral Position of a Moving Web (이송중인 웹의 장력 및 사행제어)

  • Shin, Kee-Hyun;Kwon, Soon-Oh
    • Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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    • pp.74-80
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    • 2002
  • A mathematical tension model for a moving web in a multi-span web handling system was derived and validated by using a simulator which includes unwinder, driven roller, winder, load cells, controllers, etc. A tension controller was designed to compensate tension disturbances generated by velocity changes of the unwinder and driven roller. From experimental results it was proved that the tension model properly expressed the tension behavior of a moving web for specific conditions. The distributed tension controller designed by using the pole-placement technique compensated the tension disturbances transfered from upsteram tension variation. Interactions between web spans including "tension transfer phenomenon" were clearly confirmed through the study. A mathematical model of lateral motion of a moving web was verified also by using the same experimental apparatus which includes displacement type guidance systems. And a feedforward control strategy was designed for more accurate control of the lateral motion of a moving web, which utilize a measured signal of the lateral displacement of web in a previous span and a more correctly identified mathematical model to estimate the disturbance of lateral motion from the previous span. This approach was turned out to be effective in improving the performance of the guidance system for more wide range disturbances.

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