Thematische Bibliographien / Deflecting Structure

Inhaltsverzeichnis

  1. Zeitschriftenartikel
  2. Dissertationen
  3. Bücher
  4. Buchteile
  5. Konferenzberichte
  6. Berichte der Organisationen

Auswahl der wissenschaftlichen Literatur zum Thema „Deflecting Structure“

Autor: Grafiati
Veröffentlicht am 25. Juni 2021
Zuletzt aktualisiert am 1. Februar 2022

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Zeitschriftenartikel zum Thema "Deflecting Structure"

1

Quan, Hui, Yongkang Wu, Ying Guo, Kai Song und Yanan Li. „Multiobjective Hydraulic Design and Performance Analysis of a Vortex Pump Based on Orthogonal Tests“. Shock and Vibration 2021 (29.03.2021): 1–14. http://dx.doi.org/10.1155/2021/6687856.

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We design optimization on the overall blade structure of a vortex pump conducted by using the orthogonal test method to clarify the matching relationship of impeller and casing structures and then improve the hydraulic performance of the vortex pump. Based on two different impeller structures of forward-deflecting (denoted as R1 − F2) and backward-deflecting (denoted as F1 − R2), key parameters describing the impeller structure are calculated through optimization for the objective function of hydraulic efficiency by means of orthogonal tests and computational fluid dynamic simulations. Optimization computations show that the forward-deflecting blade impeller is superior to the backward-deflecting one. Model test of the optimized vortex pump is carried out calculating the error from the comparison of pump efficiencies calculated by model test and numerical simulation is calculated to be less than 6%. The experimental verification shows that the flow simulation has some errors. The weight of structure parameters such as the blade installation angle (α), the blade deflecting angle (β), the position of blade deflecting point (L), the radius (r) of smoothing arc at the deflecting point, the wedge type (W) of blade, to the lift head, the flow rate, and the efficiency of the pump is investigated, through multiparameter optimizations. Visualization observation of flows in the model pump consisted of a back-placed impeller and a front vaneless chamber is further performed. The characteristic of vortex formation predicted by flow simulation agrees with the result of visualization observation. The above results demonstrate that the optimum impeller type of vortex pump is forward-deflecting blade impeller. The optimum combination of the key structure parameters is that the deflection angle of the blade inlet (α) equals 30°, the position of blade deflecting point lM = 2/3 L, the chamfering radius (r) at the deflecting point r = 3 mm, and the best wedge type is axial deflecting blade.
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Volobuev, E. N., A. A. Zavadtsev, D. A. Zavadtsev, L. V. Kravchuk, V. V. Paramonov, M. V. Lalayan, A. J. Smirnov, N. P. Sobenin und D. V. Churanov. „Transverse deflecting structure XFEL TDS INJ“. Journal of Physics: Conference Series 747 (September 2016): 012083. http://dx.doi.org/10.1088/1742-6596/747/1/012083.

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Shi, Shao Yan, Yi Jiang und Xiao Tong Dong. „Deflecting Features of Gas from Double-Faced Deflector and Structure Optimization of Deflector“. Applied Mechanics and Materials 387 (August 2013): 314–18. http://dx.doi.org/10.4028/www.scientific.net/amm.387.314.

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This paper uses three-dimensional dynamical simulation of gas jet to demonstrate basic deflecting features of the double-faced deflector, during the launch process of the land-based missile with the vehicle-mounted vertically thermal launch. The calculation shows that the deflection of the gas flow is good, reducing knock-on effect and ablative effect on launch device. But wheels of the launch vehicle are still under visible influent from the gas flow. The paper optimizes the double-faced deflector and compares different suggestions in order to find a better deflection.
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Bolgov, R. O., M. A. Gusarova, D. S. Kamenshchikov, M. V. Lalayan, A. Yu Smirnov und N. P. Sobenin. „Higher order modes in an RF deflecting structure“. Instruments and Experimental Techniques 54, Nr. 6 (November 2011): 813–22. http://dx.doi.org/10.1134/s0020441211060030.

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Staras, S. „Simulation and properties of the twined helical deflecting structure“. IEEE Transactions on Electron Devices 49, Nr. 10 (Oktober 2002): 1826–30. http://dx.doi.org/10.1109/ted.2002.803643.

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Piekarczyk, Adam. „Reinforced and unreinforced AAC masonry walls supported on deflecting structure“. ce/papers 2, Nr. 4 (September 2018): 377–87. http://dx.doi.org/10.1002/cepa.861.

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Jia, Ya Lei, Zhong He Han, Fu You Li, Ya Kai Bai und Ji Xuan Wang. „Influence of Flap Deflection Angle on Wind Turbine Airfoil with Trailing Edge Flaps“. Advanced Materials Research 977 (Juni 2014): 222–27. http://dx.doi.org/10.4028/www.scientific.net/amr.977.222.

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To improve the ability of capturing the wind energy of wind turbine and shorten the design period is of great importance to designing wind turbine blade. The article established S809 airfoil model with trailing edge flaps, The gap of the frontal subject and trailing edge flap adopt uniform gap structure, this structure will reduce the influence of the gap on aerodynamic characteristics.Using the k-ω Two equation turbulence model , the article calculated aerodynamic performance of S809 with 10% chord length trailing edge flaps under different deflecting angles. Results show that gap between the main body and trailing edge flap has little effect on airfoil aerodynamic performance, however, the deflection Angle of Trailing edge flap have great affect on airfoil aerodynamic performance, when deflection Angle of trailing edge flap is 14 ° degrees ,the lift-to-drag ratio is the largest.
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Volobuev, E. N., A. A. Zavadtsev, D. A. Zavadtsev, A. J. Smirnov, N. P. Sobenin und D. V. Churanov. „High power RF system for transverse deflecting structure XFEL TDS INJ“. Journal of Physics: Conference Series 747 (September 2016): 012081. http://dx.doi.org/10.1088/1742-6596/747/1/012081.

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Jing-Ru, Zhang, Hou Mi, Dai Jian-Ping, Pei Shi-Lun und Pei Guo-Xi. „Design and studies on the traveling wave transverse RF deflecting structure“. Chinese Physics C 32, Nr. 3 (März 2008): 232–35. http://dx.doi.org/10.1088/1674-1137/32/3/015.

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Piekarczyk, Adam. „The experimental investigation of the failure of load-bearing masonry walls supported by a deflecting structure“. Budownictwo i Architektura 19, Nr. 3 (30.09.2020): 127–41. http://dx.doi.org/10.35784/bud-arch.2142.

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The paper presents selected results of tests of full-scale masonry walls linearly supported on a deflecting beam. The walls with thin bed joints and unfilled head joints were 4.55 m long and 2.45 m high, and were made of group 1 calcium silicate masonry units. The tests included walls with and without openings. The tests were carried out in a specially designated and constructed test stand, which allowed simultaneous vertical load on the upper edge of the wall and vertical deflection of the beam supporting this wall. During the test, measurements of mutual displacements of six points on the wall surface were carried out. On both faces of masonry specimens, the changes of the length of the measuring bases connecting these six points were recorded. Walls without openings were detached from the central part of the supporting beam at a deflection not exceeding 2 mm. Walls with one door opening also cracked at an early stage of tests. In this case, a detachment from the supporting beam and cracking at the ends of the lintel occurred because of the rotation of the pillars connected by the lintel above the opening. In walls with two door openings, first cracks were formed at the ends of lintels due to the rotation of pillars with a small deflection of the supporting beam, less than 3 mm. Whereas, in walls with door and window openings, first cracks occurred under the window and at the end of the lintel in the outer pillar of the wall.
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Dissertationen zum Thema "Deflecting Structure"

1

Moss, Andrew M. „Analysis of a Gravity Hinge System for Wind Turbines“. Cleveland State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=csu1624479290234317.

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Cho, Myung Kyu. „Structural deflections and optical performances of lightweight mirrors“. Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184875.

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A parametric design study of light weight mirror shapes with various support conditions was performed utilizing the finite element program NASTRAN. Improvements in the mirror performance were made based on the following design criteria: (1) minimization of the optical surface wavefront variations, (2) minimization of the self-weight directly related to cost of manufacturing, and (3) optimal location of support points. A pre-processor to automatically generate a finite element model for each mirror geometry was developed in order to obtain the structural deformations systematically. Additionally, a post-processor, which prepares an input data file for FRINGE (an optical computer code) was developed for generating the optical deflections that lead to the surface wavefront variations. Procedures and modeling techniques to achieve the optimum (the lightest and stiffest mirror shape due to self-weight) were addressed. Fundamental natural frequency analyses, for contoured back mirror shapes for a variety of support conditions, were performed and followed by comparisons of the results which were obtained from NASTRAN and a closed-form approximate solution. In addition, element validity and sensitivity studies were conducted to demonstrate the behavior of the element types provided in the NASTRAN program when used for optical applications. Scaling Laws for the evaluations of the optical performances and the fundamental frequencies were established.
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Qin, Jianfeng. „Predicting Flexible Pavement Structural Response Using Falling Weight Deflectometer Deflections“. Ohio University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1275612839.

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Nayyerloo, Mostafa. „Real-time Structural Health Monitoring of Nonlinear Hysteretic Structures“. Thesis, University of Canterbury. Department of Mechanical Engineering, 2011. http://hdl.handle.net/10092/6581.

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The great social and economic impact of earthquakes has made necessary the development of novel structural health monitoring (SHM) solutions for increasing the level of structural safety and assessment. SHM is the process of comparing the current state of a structure’s condition relative to a healthy baseline state to detect the existence, location, and degree of likely damage during or after a damaging input, such as an earthquake. Many SHM algorithms have been proposed in the literature. However, a large majority of these algorithms cannot be implemented in real time. Therefore, their results would not be available during or immediately after a major event for urgent post-event response and decision making. Further, these off-line techniques are not capable of providing the input information required for structural control systems for damage mitigation. The small number of real-time SHM (RT-SHM) methods proposed in the past, resolve these issues. However, these approaches have significant computational complexity and typically do not manage nonlinear cases directly associated with relevant damage metrics. Finally, many available SHM methods require full structural response measurement, including velocities and displacements, which are typically difficult to measure. All these issues make implementation of many existing SHM algorithms very difficult if not impossible. This thesis proposes simpler, more suitable algorithms utilising a nonlinear Bouc-Wen hysteretic baseline model for RT-SHM of a large class of nonlinear hysteretic structures. The RT-SHM algorithms are devised so that they can accommodate different levels of the availability of design data or measured structural responses, and therefore, are applicable to both existing and new structures. The second focus of the thesis is on developing a high-speed, high-resolution, seismic structural displacement measurement sensor to enable these methods and many other SHM approaches by using line-scan cameras as a low-cost and powerful means of measuring structural displacements at high sampling rates and high resolution. Overall, the results presented are thus significant steps towards developing smart, damage-free structures and providing more reliable information for post-event decision making.
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Rockstroh, Benjamin Andreas. „An investigation into the effects of early propping removal on the deflection of reinforced concrete beams“. Master's thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/29285.

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In today’s fast paced construction industry, there is an ever present need to increase productivity and to complete projects as quickly as possible. Reinforced concrete is a popular and widely used construction material. However it has the unfortunate drawback in that the concrete requires time to set and gain sufficient strength before loads may be applied and the formwork and props can be removed. It is therefore desirable to keep propping times to a minimum. If the propping is removed too early, there is a risk of the member deflecting excessively and exceeding the maximum allowable limits, or in severe cases it could even lead to a structural failure or collapse. The SANS 2001 code provides recommended propping times for beams and slabs, which can be used as a guideline by building contractors and structural designers. These propping times present a universal approach, which does not consider all the factors that affect deflection. This simplified approach may be considered to be conservative as shorter propping durations could be possible without a loss in performance. The aim of this dissertation is to look into the effects of early propping removal on the longterm deflections of concrete members. This was done by modelling the deflection of a typical reinforced concrete beam at different ages of loading, using three code-based deflection calculation methods. The codes that were used are the South African National Standard (SANS), Eurocode (EC2) and American Concrete Institute code (ACI 318). A detailed literature-based investigation was conducted to determine the factors which affect deflection in reinforced concrete members, as well as the theory behind the code-based deflection calculation procedures. This was followed by the modelling of deflections using the abovementioned methods. Three case studies were performed to determine the effects of early propping removal under different scenarios. The first case study only deals with the effects of early age loading on long-term deflection. As an added point of interest, two different concrete mixes were used, made with two different types of cement. The second case study compares the effect that different levels of relative humidity have on the long term deflection at early ages of loading. Lastly, the effects of concrete strength on long-term deflections at early ages of loading was modelled. The results of the first case study indicated that a reduction in propping time is possible without causing excessive deflections. In the second and third case study is was observed that both the relative humidity and concrete strength respectively have an effect on the long term deflection and therefore also influence the propping time. The study concluded that based on the obtained estimated deflection values using the codebased methods, the propping times provided in the SANS 2001 code may in certain applications be conservative. According to the results obtained from the code-based deflection calculation procedures, it is possible to reduce the propping duration. It was suggested that an alternative method should be developed which would allow structural designers to determine the required propping time more accurately.
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Chu, Kwong-Yiu. „A study of the deflection and strength of partially prestressed concrete beams with unbonded tendons“. Thesis, University of Leeds, 1985. http://etheses.whiterose.ac.uk/184/.

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Fifteen beams with-unbonded tendons consisting of I and rectangular sections with different amounts of prestressed and non-prestressed reinforcement, were tested under short-term and sustained loading and a combination of sustained loading with intermittent short-term cyclic loading(combined loading). Two additional ordinary reinforced concrete beams were tested under combined loading for comparison purposes. Results indicated that a noticeable amount of non-recoverable residual deflection occurred due to the effect of cyclic load. The cause was believed to be non-recoverable creep strain and increased creep rate under cyclic loading. An analytical method was formulated for calculating the short-term deflection of unbonded partially prestressed beams. The deflection was calculated by integration of curvature based on the recommendations of CP110, Appendix A, with certain modification. The computed results agreed well with the experiments. The experimental deflection was also checked against the computed results according to the Model Code and the ACI Code. The former was found to be unconservative for unbonded I-section beams. The ACI Code I-effective formula might require modification of the power in order to produce consistently conservative results. Moreover, the ACI simplified formula for calculating the long-term deflection was unconservative for unbonded beams both for sustained and combined loading. The flexural strength of the test beams was greater than predicted by the CP110, Tam-Pannell and the ACI Code methods mainly due to underestimation of the tendon stress at ultimate moment. The stress in the tendon reached the 0.2% proof stress and the stress in the non-prestressed steel sometimes reached the 2.5% proof stress. The friction between the tendon and the concrete caused localised stress change and hence increased the strength of the unbonded beam significantly.
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Frech-Baronet, Jessy. „Multi-scale characterization and modelling of the long-term deflection of concrete structures“. Doctoral thesis, Université Laval, 2020. http://hdl.handle.net/20.500.11794/66417.

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Abayakoon, Sarath Bandara Samarasinghe. „Large deflection elastic-plastic analysis of plate structures by the finite strip method“. Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26946.

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A solution procedure based on the finite strip method is presented herein, for the analysis of plate systems exhibiting geometric and material non-linearities. Special emphasis is given to the particular problem of rectangular plates with stiffeners running in a direction parallel to one side of the plate. The finite strip method is selected for the analysis as the geometry of the problem is well suited for the application of this method and also as the problem is too complicated to solve analytically. Large deflection effects are included in the present study, by taking first, order non-linearities in strain-displacement relations into account. Material non-linearities are handled by following von-Mises yield criterion and associated flow rule. A bi-linear stress-strain relationship is assumed for the plate material, if tested under uniaxial conditions. Numerical integration of virtual work equations is performed by employing Gauss quadrature. The number of integration points required in a given direction is determined either by observing the individual terms to be integrated or by previous experience. The final set of non-linear equations is solved via a Newton-Raphson iterative scheme, starting with the linear solution. Numerical investigations are carried out by applying the finite strip computer programme to analyse uniformly loaded rectangular and I beams with both simply supported and clamped ends. Displacements, stresses and moments along the beam are compared with analytical solutions in linear analyses and with finite element solutions in non-linear analyses. Investigations are also extended to determine the response of laterally loaded square plates with simply supported and clamped boundaries. Finally, a uniformly loaded stiffened panel is analysed and the results are compared with finite element results. It was revealed that a single mode in the strip direction was sufficient to yield engineering accuracy for design purposes, with most problems.
Applied Science, Faculty of
Civil Engineering, Department of
Graduate
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Özdemir, Aytekin, Zeki Hayran, Yuzuru Takashima und Hamza Kurt. „Polarization independent high transmission large numerical aperture laser beam focusing and deflection by dielectric Huygens’ metasurfaces“. ELSEVIER SCIENCE BV, 2017. http://hdl.handle.net/10150/625955.

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In this letter, we propose all-dielectric Huygens' metasurface structures to construct high numerical aperture flat lenses and beam deflecting devices. The designed metasurface consists of two-dimensional array of all dielectric nanodisk resonators with spatially varying radii, thereby introducing judiciously designed phase shift to the propagating light. Owing to the overlap of Mie-type magnetic and electric resonances, high transmission was achieved with rigorous design analysis. The designed flat lenses have numerical aperture value of 0.85 and transmission values around 80%. It also offers easy fabrication and compatibility with available semiconductor technology. This spectrally and physically scalable, versatile design could implement efficient wavefront manipulation or beam shaping for high power laser beams, as well as various optical microscopy applications without requiring plasmonic structures that are susceptible to ohmic loss of metals and sensitive to the polarization of light.
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Liang, Anthony. „Electric deflection measurements of sodium clusters in a molecular beam“. Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31750.

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Thesis (Ph.D)--Physics, Georgia Institute of Technology, 2010.
Committee Chair: de Heer, Walter; Committee Member: Chou, Mei-Yin; Committee Member: First, Phillip; Committee Member: Whetten, Robert; Committee Member: Zangwill, Andrew. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Bücher zum Thema "Deflecting Structure"

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Ji, Tianjian. Structural Design Against Deflection. Boca Raton, FL : CRC Press/Taylor & Francis Group, [2020]: CRC Press, 2020. http://dx.doi.org/10.1201/9780429465314.

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Diverging pathways: Social structure and career deflections. Cambridge, England: Cambridge University Press, 1993.

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Ellis, John S. Deflections by Pasternak's theorem. Kingston, Ont., Canada: Dept. of Civil Engineering, Royal Military College, 1985.

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Wang, C. M. Shooting-optimization technique for large deflection analysis of structural members. St. Lucia: University of Queensland, Dept. of Civil Engineering, 1990.

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Wang, C. M. Shooting-optimization technique for large deflection analysis of structural members. St Lucia, Q., Australia: Department of Civil Engineering, The University of Queensland, 1990.

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Fichter, W. B. Some solutions for the large deflections of uniformly loaded circular membranes. Washington, D.C: National Aeronautics and Space Administration, 1997.

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Morales-Valentin, Gustavo E. Temperature differential effect on the falling weight deflectometer deflections used for structural evaluation of rigid pavements. [Austin]: Center for Transportation Research, Bureau of Engineering Research, University of Texas at Austin, 1987.

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Mei, C. Component mode synthesis and large deflection vibration of complex structures: Final report for the period ended January 31, 1987. [Washington, DC: National Aeronautics and Space Administration, 1987.

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Tang, Man-Chung. The Story of the Koror Bridge. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2014. http://dx.doi.org/10.2749/cs001.

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<p>Koror Babeldaob Bridge, also called Koror Babelthuap Bridge or simply Koror Bridge, connects the islands of Koror and Babeldaob in the Republic of Palau. The design of the bridge began in 1974 and was based on the prevailing AASHO Standard Specifications at that time and was supplemented by ACI and CEB-FIP design recommendations on an as-needed basis. When the Koror Bridge was opened to traffic in April 1977, it was the world's longest concrete girder span. A few years later, the bridge began to deflect more than had been anticipated. The owner commissioned a Japanese engineering firm in 1985 and then a US engineering firm in 1993 to conduct in-depth investigations of the structure. Both firms came to the same conclusion that the bridge was structurally safe and that the excessive deflection was an unexplainable phenomenon. Nevertheless, in order to improve the driving quality of the bridge deck, the owner decided to repair the bridge. The repair scheme made changes to the structural system and added a large amount of post-tensioning force to the bridge. Unfortunately, less than three months after the repair, late in the afternoon on 26 September, 1996,nineteen and a half years after it was opened to traffic, the bridge collapsed. Thereafter, most of the documents were sealed as a result of litigation between the various parties and the debris was cleared. For a long time, it was impossible to study the facts surrounding the bridge's collapse. Only recently, through continuous probing by a group of engineers, were these documents made accessible to researchers.</p>
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Deflections of concrete structures. Detroit: American Concrete Institute, 1985.

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Buchteile zum Thema "Deflecting Structure"

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Seward, Derek. „Deflection“. In Understanding Structures, 259–70. London: Macmillan Education UK, 1994. http://dx.doi.org/10.1007/978-1-349-12083-3_13.

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Seward, Derek. „Deflection“. In Understanding Structures, 287–99. London: Macmillan Education UK, 1998. http://dx.doi.org/10.1007/978-1-349-14809-7_13.

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Ji, Tianjian. „Introduction“. In Structural Design Against Deflection, 1–24. Boca Raton, FL : CRC Press/Taylor & Francis Group, [2020]: CRC Press, 2020. http://dx.doi.org/10.1201/9780429465314-1.

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Ji, Tianjian. „Deflections and Internal Forces“. In Structural Design Against Deflection, 25–50. Boca Raton, FL : CRC Press/Taylor & Francis Group, [2020]: CRC Press, 2020. http://dx.doi.org/10.1201/9780429465314-2.

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Ji, Tianjian. „More Direct Internal Force Paths“. In Structural Design Against Deflection, 51–87. Boca Raton, FL : CRC Press/Taylor & Francis Group, [2020]: CRC Press, 2020. http://dx.doi.org/10.1201/9780429465314-3.

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Ji, Tianjian. „Smaller Internal Forces“. In Structural Design Against Deflection, 88–124. Boca Raton, FL : CRC Press/Taylor & Francis Group, [2020]: CRC Press, 2020. http://dx.doi.org/10.1201/9780429465314-4.

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Ji, Tianjian. „More Uniform Distribution of Internal Forces“. In Structural Design Against Deflection, 125–53. Boca Raton, FL : CRC Press/Taylor & Francis Group, [2020]: CRC Press, 2020. http://dx.doi.org/10.1201/9780429465314-5.

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Ji, Tianjian. „Converting More Bending Moments Into Axial Forces“. In Structural Design Against Deflection, 154–84. Boca Raton, FL : CRC Press/Taylor & Francis Group, [2020]: CRC Press, 2020. http://dx.doi.org/10.1201/9780429465314-6.

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Ji, Tianjian. „Concluding Remarks“. In Structural Design Against Deflection, 185–87. Boca Raton, FL : CRC Press/Taylor & Francis Group, [2020]: CRC Press, 2020. http://dx.doi.org/10.1201/9780429465314-7.

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Stronge, William James, und Tongxi Yu. „Static Deflection“. In Dynamic Models for Structural Plasticity, 51–72. London: Springer London, 1993. http://dx.doi.org/10.1007/978-1-4471-0397-4_3.

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Konferenzberichte zum Thema "Deflecting Structure"

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Rashidi, Majid, J. R. Kadambi und Scott Suren. „Design of a Rooftop Wind Harnessing System With Smart Wind Deflecting Structure“. In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65951.

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This work presents a novel design for a rooftop wind tower system; the system is primarily intended for areas of low natural wind speeds. The relatively low natural wind is increased by a factor of about 1.6 times via a wind deflecting structure to reach the cut-in speed of typical rooftop wind turbines which is approximately 3 m/s. The system additionally responds to relatively high wind velocity, above 20 m/s, in a way that eliminates its wind speed amplification attributes; this will protect the wind turbines against exposure to high wind speeds that could be harmful to the turbines and to the mast structure that supports the turbine/generator. In case of high natural wind speed, above 20 m/s, passively controlled trap-doors, that are parts of the wind deflecting structure, allow wind to pass through the wind deflecting structure, thereby eliminating wind speed amplification of the deflecting structure. The design disclosed in this work comprises of a half cylinder wind deflecting structure that includes a plurality of spring loaded trap-doors; when closed, they form the wind deflecting structure up to a prescribed maximum natural wind speed. As the natural wind speed increases beyond its prescribed maximum, the spring loaded trap doors open as the result of the pressure exerted upon them by the wind. The design presented in this work increases the range of cut-in and cut-out wind speeds for a typical rooftop wind turbine.
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2

Rohrs, Michael, Christopher Gerth und Holger Schlarb. „Time resolved phase space tomography at flash using a transverse deflecting RF-structure“. In 2007 IEEE Particle Accelerator Conference. IEEE, 2007. http://dx.doi.org/10.1109/pac.2007.4440133.

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3

Rashidi, Majid, J. R. Kadambi und Asuquo Ebiana. „Performance of a Rooftop Wind Turbine System Having a Wind Deflecting Structure, Experimental Results“. In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50143.

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This work presents the results of an experimental work on a novel design for wind tower system. The system is intended for areas of low wind speeds. The wind tower consists of four rooftop turbines mounted alongside a cylindrical structure that acts as a Wind Deflecting Structure (WDS). This arrangement results in lowering of the cut-in wind speed for the turbine; the system allows the turbine rotors to operate in the areas that have normally low wind speeds, as low as 3 m/s. The nameplate rating of each of the turbines is 1.65. The four-turbine system was installed on the rooftop of a five story building in downtown Cleveland, Ohio. A fifth stand-alone wind turbine was installed on the rooftop of the same building as the reference in order to examine. Orientation of the four wind turbines is controlled by a close-loop active direction control sub-system using a double worm-gear reduction as its actuator. The output of the worm-gear unit has a spur gear pinion that meshes with an external gear that is an integral part of the outer race of the bearing that in turn supports the arm to which the four turbines are attached to. The wind power data from five turbines (four turbines on the tower & one reference turbine) were recorded by PLC’s. The data was updated and recorded every 10 seconds. This means that in every hour there were 360 data points for each of the turbines. For each day the number of data points for each turbine is 24 × 360 = 8640. The other information that is recorded every 1 second includes: the wind direction, wind speed, time, date and an index number. The experimental results show that the power output of the each of the turbines installed on the proposed system may be increased by an average factor of about 4 times compared to the power generated by the stand-alone turbine under the same wind flow condition.
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Rashidi, Majid, Jaikrishnan R. Kadambi und Renjie Ke. „Wind Energy Harnessing System for Low and High Wind Speeds“. In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11995.

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Abstract This work presents the design and analysis of a novel wind energy harnessing system that makes use of wind defecting structures to increase the ambient wind speed at geographic locations with relatively low wind speed. The system however reacts to highspeed wind conditions by altering the profile of the wind defecting structure in order to eliminate wind speed amplification attribute of the system, thereby protecting the wind turbine assembly at high speed wind conditions. Although increasing the wind speed is advantageous at geographic locations that the wind speed is typically low; however, from times to time, there could be sustained high-speed wind conditions at the same locations that may damage the wind turbine systems that take advantage of the wind defecting structures. The present work disclosed a wind deflecting structure formed by at least two sail-like partial cylindrical structures that are supported atop of a tower-like foundation in a symmetric arrangement, where one or more wind turbines can be installed in the space between the two partial cylinders. The two partial cylinders, each substantially in form a quarter cylinder is made of plurality of parallel ribbed-like bars, hereafter referred to as “bars” with a flexible thin material that are mechanically supported by the bars. The bars are oriented in a direction perpendicular to the ground; allowing the wing deflecting structures to accept horizonal axis or vertical axis turbines in the space between them. The function of the bars is to allow the thin material, attached to them, to assume a curved configuration substantially in the form of a quarter cylinder. The apparatus is equipped with wind speed monitoring devices, and power source and power transmission means, such as cable-pulleys, chain-sprockets, gears, or mechanical linkages that all work in concert to deploy or stow the thin material along the vertical rods depending to the magnitude of the prevailing wind speed. Preliminary computational fluid dynamics analyses have shown that the wind deflecting structure proposed here in amplifies the wind speed by a factor of 1.65.
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Ameri, Ali A., und Majid Rashidi. „Analysis of a Concept for a Low Wind Speed Tolerant Axial Wind Turbine“. In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-46102.

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In this paper, the authors analyze a design for a wind tower intended for areas of low wind speeds. The wind tower consists of a combination of several rooftop size turbines arranged alongside a cylindrical structure that acts as a Wind Deflecting Structure (WDS). The WDS amplifies the effective wind speed thus allowing the turbine rotors to operate under lower ambient wind speeds. Analyses were performed using simple models as well as more sophisticated CFD methods employing Steady and Unsteady Reynolds Averaged Navier-Stokes methodology. The effect of the wind amplification was shown on a commercial small wind turbine power output map. Also, a wind turbine rotor flow was computed as operating alongside the WDS and compared to the computed operation of isolated turbines at equal effective and ambient wind velocities. The computational analyses of this work suggest that the power output of isolated rooftop wind turbines deployed at low to moderate wind speed may be matched by installing wind turbines alongside a cylindrical wind deflecting structure operating at lower wind speeds. Other benefits of the arrangement are also enumerated.
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Rashidi, Majid, Jaikrishnan R. Kadambi und David Kerze. „Wind Flow Regime Around a 3 Dimensional Helical Structure“. In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-87753.

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A three dimensional heliacal structure is modeled as a wind deflecting structure in this work. The purpose of the structure is to increase the natural wind speed and direct the follow of the wind toward two columns of horizontal-axis rooftop-size wind turbines that are installed in the grooves of the helical structure, diametrically opposed to each other. Computational Fluid Dynamics (CFD) analyses were conducted to determine the influence of the helical structure on the wind speed reaching the turbines. A wind speed amplification coefficient was determined for a helical structure of 6.7 m outer diameter. The velocity profiles of the wind flow around the helical structure were determined under a postulated wind speed of 4.47 m/s. The flow was modeled as turbulent with a Reynolds Number of 2,052,167. Standard “k-ἐ” turbulent model with “near wall treatment” and “standard wall function” were adapted in all analysis. A “y+” value of 50 was held constant in all simulation. The grid-size effects on the accuracy of the results were examined. Convergence criterion was satisfied in each case. This study shows that the helical structure having an outer diameter of 6.7 m results in an average wind speed increase factor of 1.52.
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Shende, Amitkumar, Manoj Verma, T. K. Vashist und Joseph Mathew. „Simulations of 3D Separation in the Diffuser“. In ASME 2012 Gas Turbine India Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gtindia2012-9555.

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Large eddy simulations of an asymmetric diffuser characterized by complex 3-D flow separation for which RANS models provide qualitatively wrong predictions have been performed.. An incompressible, turbulent, fully-developed flow in a rectangular duct (aspect ratio 1:3.33) expands into this diffuser. Two such diffusers were constructed by deflecting a pair of adjacent walls for the experiments in Cherry et al. [1, 2] (2006, 2008) and Buice, C. U. and Eaton, J. K. [3]. Most of our simulations consider Diffuser 1 with wall deflection angles 11.3° and 2.56°. In the experiments, flow begins to separate at the corner formed by the two deflected walls and then spreads so that flow is separated from the wall at the larger deflection angle. In simulations with RANS models, flow separates from the wall with the smaller deflection. It has been possible to obtain solutions with LES where flow separates correctly, off the wall at the larger deflection angle, as in the experiment. The LES finds a qualitatively correct separation, with characteristics in close quantitative agreement (within 5%) with the experimental values for Diffuser 1. The effects of variations in grid aspect ratio, grid refinement, inlet length, number of flow passes, and secondary flow structure upstream of the diffuser on solutions were determined. An LES was carried out for Diffuser 2 (deflection angles of 9° and 4° respectively), applying all lessons learnt in Diffuser 1 studies. It was found that the results for Diffuser 2 are not as quantitatively close to the experimental results as in case of the Diffuser 1, but the discrepancies appear to have a similar origin in some finer aspect of diffuser inflow conditions.
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Oh, Dong Seok, Wang Kee In und Tae Hyun Chun. „Structure of Turbulent Flow in Subchannel of Rod Bundle Downstream of Spacer Grid With Hybrid Flow Mixing Device“. In 10th International Conference on Nuclear Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/icone10-22264.

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An experiment was performed in a wind tunnel to investigate the flow structure in a rod bundle with a hybrid vane grid. The hybrid vane is a flow-mixing device, which consists of two pairs of primary and secondary vanes in a cell. The test section is a rectangular channel (300 mm × 300 mm × 2400 mm) including 3 × 3 rod (75 mm diameter) array with a spacer grid. The pitch to diameter ratio of the rod array is 1.33. The flow structures downstream the grid are measured at Reynolds number of 1.2 × 105 for 35-degree deflecting angle of the hybrid flow-mixing vane. The data are obtained for the distributions of the time mean axial velocity, lateral velocity, and turbulent intensities in 3 component directions over a center subchannel along axial locations and compared with the previous results of split vane grid that has two vanes in a cell. The results show that the mixing efficiency of the hybrid vane grid could be similar with that of the split vane grid because swirl factor of the hybrid vane grid is higher than that of split vane grid and the magnitude of axial turbulent intensity, turbulent diffusion coefficient, and cross flow factor is similar to each other in spite of differences of the vane numbers and shape in a cell between hybrid and split vane grids.
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BANK, LAWRENCE, und THOMAS MELEHAN. „Shear deflection in multicelled thin-walled orthotropic composite beams“. In 30th Structures, Structural Dynamics and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1989. http://dx.doi.org/10.2514/6.1989-1361.

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CHEN, HSIN-PIAO, und JEFFREY SHU. „A large deflection shear deformation theory for unsymmetric composite laminates“. In 32nd Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1991. http://dx.doi.org/10.2514/6.1991-961.

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Berichte der Organisationen zum Thema "Deflecting Structure"

1

Inagaki, Shigemi. Deflecting modes of the side-coupled cavity structure. Office of Scientific and Technical Information (OSTI), November 1990. http://dx.doi.org/10.2172/6288861.

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2

Emma, Paul J. A Transverse RF Deflecting Structure for Bunch Length and Phase Space Diagnostics. Office of Scientific and Technical Information (OSTI), Juni 2001. http://dx.doi.org/10.2172/784939.

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3

Emma, Paul J. Bunch Length Measurements Using a Transverse RF Deflecting Structure in the SLAC Linac. Office of Scientific and Technical Information (OSTI), Mai 2002. http://dx.doi.org/10.2172/799088.

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4

Wands, R. Summary of Deflections from Fully Assembled EC Structure Finite Element Model. Office of Scientific and Technical Information (OSTI), Juli 1987. http://dx.doi.org/10.2172/1030721.

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