Gotowe bibliografie tematyczne / Trapezoidal Wedge

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Gotowa bibliografia na temat „Trapezoidal Wedge”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Trapezoidal Wedge"

Na, SeonHong, i Sang Inn Woo. "Theoretical Evaluation for Soil Thrust of Single-Track System over Clay Slope via Upper Bound Analysis". Applied Sciences 13, nr 9 (22.04.2023): 5222. http://dx.doi.org/10.3390/app13095222.

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This study aimed to theoretically evaluate soil thrust on a clay slope as a reaction force associated with the motion of an off-road tracked vehicle. The existing concept of the potential failure modes of a clay block on flat ground has extended to determine the soil thrust of sloped clay ground. Based on the upper-bound limit analysis, the soil thrust under the most critical failure was derived for three potential failure modes: block, triangular-wedge, and trapezoidal-wedge failures. Specifically, the influence of the slope angle, the shear strength of clay, the weight of a vehicle, and the geometry of a track system on the soil thrust was investigated. Only the block and triangular wedge failure modes were able to occur, and the geometry of a single-track system could lead to different failure modes. Under the block failure mode, the soil thrust decreased as the slope became stiff, and the vehicle weight increased. On the other hand, the soil thrust decreased as the slope angle decreased under the triangular-wedge failure mode.

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de Paula, Emygdio J. L., Alvaro Baik Cho, Rames Mattar Junior i Arnaldo V. Zumiotti. "Madelung’s Deformity: Treatment With Radial Osteotomy and Insertion of a Trapezoidal Wedge". Journal of Hand Surgery 31, nr 7 (wrzesień 2006): 1206–13. http://dx.doi.org/10.1016/j.jhsa.2006.06.017.

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Lu, Xi Lin, i Feng Di Li. "Study on the Stability of Large Cross-River Shield Tunnel Face with Seepage". Applied Mechanics and Materials 405-408 (wrzesień 2013): 1371–74. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.1371.

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By 3D numerical analysis, the seepage force on the tunnel face was obtained and shows linearly increasing trend with the water level. By considering the average seepage force on the wedge boundary of 3D trapezoidal wedge model, the limit support pressure to keep stability of tunnel face under seepage condition was obtained. The total limit support pressure increases almost linearly with the water level. In order to consider the deformation seepage coupling effect, the 3D coupled deformation and seepage numerical analysis was further used to investigate the influence of the water level on the failure of tunnel face, the results show the failure mode changes with the increase of water level, and the limit support pressure increases nonlinearly with the water level.

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Relvas, António T., i António N. Pinheiro. "Stepped chutes lined with wedge-shaped concrete blocks: hydrodynamic pressures on blocks and stability analysis". Canadian Journal of Civil Engineering 38, nr 3 (marzec 2011): 338–49. http://dx.doi.org/10.1139/l11-003.

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The use of wedge-shaped concrete block overlays to protect embankments subject to flows with relatively high velocities is an idea dating from the late 1960s. Subsequent studies addressed the block stability and design, with or without drainage layer underneath, and the flow characteristics. One aspect still lacking systematic research is the block stability considering the influence of the drainage layer and of the uplift pressure beneath the blocks. The stability of blocks located in the training walls of a trapezoidal cross section has never been investigated, although this type of section is expected when installing a concrete block overlay over embankments. The present study addresses this aspect, using a relatively large facility where the blocks are laid on a drainage layer over an embankment artificially saturated, thus intending to simulate a concrete block spillway installed over a compacted homogeneous earth dam. Data collected both in a trapezoidal flume and in a rectangular flume are is analyzed, together with other authors’ data for this type of stepped overlay. The inherent hydrodynamic stability is verified. Experiments with hydraulic jump formation over the blocks at the end of the flume also showed block stability.

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Wang, Ai Qin, Jing Pei Xie, Wen Yan Wang i Ji Wen Li. "The Numerical Simulation of Microstress for Hypereutectic Al-Si Alloys". Advanced Materials Research 211-212 (luty 2011): 1133–36. http://dx.doi.org/10.4028/www.scientific.net/amr.211-212.1133.

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The elastic-plastic finite element mechanical model of hypereutectic Al-Si alloy was established based on ANSYS software. When the Si particles were circle, trapezium, rectangle or triangle, the microstress of Al-Si alloy under the external load were simulated. When the size of Si particles changed from 25μm to 45μm, the stress of Si particles and matrix interface was calculated. The effects of morphology and size of Si particles and loads on micro-mechanics characteristic of alloy were analyzed. The results showed that: under the same load, triangle or wedge angle Si particles make the biggest stress in the matrix, trapezoidal particles make the second and the spherical particles make the smallest. With the increase of the load, the stress and the stress concentration of Si particles in the matrix was increased, the stress of wedge angle particle increases remarkably, but the stress of spherical particles increases slowly. With the increase of the size of Si particles, the stress and the stress concentration of Si particles in matrix are increased.

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Kampa, R., A. Al-Beer i T. Axelrod. "Madelung’s Deformity: Radial Opening Wedge Osteotomy and Modified Darrach Procedure Using the Ulnar Head as Trapezoidal Bone Graft". Journal of Hand Surgery (European Volume) 35, nr 9 (listopad 2010): 708–14. http://dx.doi.org/10.1177/1753193410375778.

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Surgery may be indicated in treating Madelung’s deformity and numerous techniques have been described. This study reports the early clinical and radiological results of a radial biplanar opening wedge osteotomy and modified Darrach procedure, using the excised ulnar head as a trapezoidal bone graft. Between 2000 and 2008, five adult wrists with symptomatic Madelung’s deformity underwent surgery. All patients were female, with an average age at surgery of 34 years. Assessment included range of movement, grip strength, DASH scores and radiological imaging. All patients improved both subjectively and objectively with regards to pain, functional range of movement, and appearance at mean follow-up of 55 months (range 14—113). All osteotomies united. One patient required removal of hardware for restricted rotation. This technique provided satisfactory results that are comparable to other studies, and avoids the use of iliac crest bone graft.

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Vanishree, B. Rao, i R. Manjula. "Analysis of various parameters affecting weir design and fabrication of Weirs: An Overview". MATEC Web of Conferences 144 (2018): 01006. http://dx.doi.org/10.1051/matecconf/201814401006.

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Several geometric parameters influence weir discharge and it is explained in our present study. The PK weir is more efficient than rectangular labyrinth weir due to reduction in entrance losses of PK weir inlet key geometry. PK weir is a type of labyrinth weir with variation in angle. Therefore, in this paper we also discuss about labyrinth weir. PKW are compatible for constructing on existing or new spillway with lesser space requirement and structural stability. PKW are installed in order to increase the discharge capacity for a given footprint area. PKW is used to increase the overflow capacity of existing dams such as, Hazelmare dam (South Africa), Dartmouth dam (Australia). Trapezoidal piano key weirs have higher discharge efficiency than rectangular weirs and it is due to interference wedge. Cd of TPKW is influenced by L/W but Wi/Wo has least effect.

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Li, Zhixiong, Tran Dinh Manh, M. Barzegar Gerdroodbary, Nguyen Dang Nam, R. Moradi i Houman Babazadeh. "The influence of the wedge shock generator on the vortex structure within the trapezoidal cavity at supersonic flow". Aerospace Science and Technology 98 (marzec 2020): 105695. http://dx.doi.org/10.1016/j.ast.2020.105695.

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Tananykhin, Dmitry, Maxim Grigorev, Elena Simonova, Maxim Korolev, Ilya Stecyuk i Linar Farrakhov. "Effect of Wire Design (Profile) on Sand Retention Parameters of Wire-Wrapped Screens for Conventional Production: Prepack Sand Retention Testing Results". Energies 16, nr 5 (3.03.2023): 2438. http://dx.doi.org/10.3390/en16052438.

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There are many technologies to implement sand control in sand-prone wells, drilled in either weakly or nonconsolidated sandstones. Technologies that are used to prevent sanding can be divided into the following groups: screens (wire-wrapped screens, slotted liners, premium screens, and mesh screens), gravel packs, chemical consolidation, and technological ways (oriented perforation and bottomhole pressure limitation) of sanding prevention. Each particular technology in these groups has their own design and construction features. Today, slotted liners are the most well-studied technology in terms of design, however, this type of sand control screen is not always accessible, and some companies tend towards using wire-wrapped screens over slotted liners. This paper aims to study the design criteria of wire-wrapped screens and provides new data regarding the way in which wire design affects the sanding process. Wires with triangular (wedge), trapezoidal, and drop-shaped profiles were tested using prepack sand retention test methodology to measure the possible impact of wire profile on sand retention capabilities and other parameters of the sand control screen. It was concluded that a trapezoidal profile of wire has shown the best result both in terms of sand production (small amount of suspended particles in the effluent) and in particle size distribution in the effluent, that is, they are the smallest compared to other wire profiles. As for retained permeability, in the current series of experiments, high sand retention did not affect retained permeability, although it can be speculated that this is mostly due to the relatively high particle size distribution of the reservoir.

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Patraev, E. V., M. S. Vakulin, Y. I. Gordeev i V. B. Yasinsky. "High-Speed Micromilling of Composite and Aluminum Alloy Parts". Proceedings of Higher Educational Institutions. Маchine Building, nr 12 (741) (grudzień 2021): 62–72. http://dx.doi.org/10.18698/0536-1044-2021-12-62-72.

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The paper deals with the design of the cutting part of complex-profile cutters with high productivity and surface quality. Numerical experiments carried out using the finite element method made it possible to determine the stresses and strains in the layer of the cut material when machining with multifaceted milling cutters of a new type and indirectly estimate the specific cutting forces. The required dimensions and shape of the cutting wedge are set with account for various geometric parameters of the cutting part, properties of the workpiece material, and cutting conditions. This made it possible to obtain a three-dimensional model of an end mill with a trapezoidal tooth and 700 cutting edges. Experimental studies also showed a change in the morphology of chips with a size of about 2 microns, which is in good agreement with the results of preliminary estimates by the finite element method. The productivity of processing with milling cutters of a new design can be improved by increasing the number of single cutting cycles up to4000–6000 s–1.

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Rozprawy doktorskie na temat "Trapezoidal Wedge"

Khare, Ojasvi. "Edge States and Effects of Disorder in Finite Graphene Sheets". Thesis, 2017. https://etd.iisc.ac.in/handle/2005/4160.

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The thesis endeavours to theoretically understand electronic properties of nite trapezoidal shaped graphene sheets, and understand zero energy edge states. The motivation for this thesis is recent experimental work at Low Temperature Nano-electronics Laboratory under Prof. Arindam Ghosh[ ?]. This work sys-tematically tries to understand graphene, a two dimensional material, and it's confinement in spacial dimensions. In Part I, we start with analytical study of bulk graphene with various hoppings in a tight-binding formulation and its band structure. Then we confine graphene in one-dimension to form semi-in finite graphene nanoribbons and numerically determine its energy spectra and wave-functions for sites along the finite direction. In Part II, graphene is confined in both spacial dimensions and starting from simplest case of finite rectangular sheet, we move on to the two different ways in which graphene can be torn. Here, numerical studies were done to determine the density of states and local density of states. Finally Parts III and IV are devoted to the study of disorders and how various kinds of disorders can be introduced in the system and their effect in localising the wave-functions along the edges.

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WANG, CHUN-HSIANG, i 王俊翔. "Using a Five Axis Machine Tool to Reserch the Wedge Angle used to Hold the Trapezoidal Workpiece". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/62864079546523957344.

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碩士
聖約翰科技大學
機械與電腦輔助工程系碩士班
105
In order to make the bottom of the thin and asymmetric trapezoidal workpiece paste together with the top of the parallel blocks while milling, it is possible to improve the fit situation by using the crescent moon shape wedge as proposed in this paper. The use of crescent moon shape wedge on the vise to hold the oblique side of the workpiece, such as trapezoid workpiece, in addition to increase the speed of loading and unloading the workpiece, the most important thing is that it can really make the bottom of the workpiece and the bottom of the parallel blocks very close to each other. In order to achieve the purpose of precision clamping. Because of the wedge angle of the wedge will seriously affect the clamping situation, so in our first study we will use the CNC five-axis machine tool to process different angles of the crescent moon shape wedges and different angles of the trapezoid workpieces, and then to explore the crescent moon shape wedges and the trapezoid workpieces in different design clamping situation, in order to enhance the stability and accuracy of crescent moon shape wedge clamping. It is proved that trapezoidal workpieces with different inclination can be used when the wedge angle is set to 4 °.

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Części książek na temat "Trapezoidal Wedge"

Gökçe, Gökay, i Zafer Dursunkaya. "Thermal Performance Evaluation Methodology of Grooved Heat Pipes with Rectangular, Trapezoidal and Wedge Cross Sections". W Advances in Heat Transfer and Thermal Engineering, 475–79. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4765-6_82.

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Kivell, Tracy L., Kelly R. Ostrofsky, Brian G. Richmond i Michelle S. M. Drapeau. "Metacarpals and manual phalanges". W Hominin Postcranial Remains from Sterkfontein, South Africa, 1936-1995, 106–43. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780197507667.003.0009.

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This chapter presents description and analysis of the metacarpals and manual phalanges from Sterkfontein. Although the morphology is generally similar across the sample where there are duplicates of the same element, there are differences in size that are quite remarkable within the context of all South African hominins. Some very large specimens suggest the presence of individuals at Sterkfontein with much larger hands, and presumably larger body size, at Sterkfontein than those of A. sediba MH2, H. naledi and the Swartkrans hominins. Australopithecus africanus had human-like proportions, but this may be plesiomorphic within the hominoid clade. The potentially less mobile trapezium-Mc1 joint, absence of a fully developed palmar pulp on the distal thumb, more limited pronation of the index finger, and potentially more wedge-shaped trapezoid inferred from the preserved external morphology, is consistent with lower manipulative loading of the thumb than is typical of later Homo. As for other forelimb elements, moderately curved manual phalanges suggests a greater reliance on forelimb-dominated locomotor behaviors and perhaps selection for more frequent use of an arboreal environment in A. africanus than is found in A. afarensis. Thus, within this broader context, the Sterkfontein fossil hominin remains are not unusual. The Sterkfontein hand fossils suggest an overall manipulative and locomotor loading regime that was more similar to that of other South African australopiths and distinct from that of later Homo, but more refined functional interpretations require additional fossil evidence, particularly from associated hand skeletons

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Streszczenia konferencji na temat "Trapezoidal Wedge"

Wright, Lesley M., i Amir S. Gohardani. "Effect of Coolant Ejection in Rectangular and Trapezoidal Trailing Edge Cooling Passages". W ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50414.

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Heat transfer coefficients are experimentally determined in various trailing edge cooling channels. A rectangular channel (AR = 3:1) with fully developed flow is used as a baseline for the study with the Reynolds number varying from 20,000 to 80,000. The heat transfer coefficients in this channel are compared to those in a similar rectangular channel with coolant extraction, which would likely be encountered in a trailing edge cooling passage. The heat transfer trends in the rectangular channel are compared to those obtained in a passage with a trapezoidal (or wedge-shaped) cross-section. The heat transfer coefficients are also obtained in the channel without coolant extraction and with extraction from the narrow side of the channel. The effect of V-shaped rib turbulators is also considered in the rectangular and trapezoidal cooling passages. In addition, the effect of entrance condition is considered with the wedge-shaped channel. Heat transfer coefficients obtained with hydrodynamically developed flow are compared to those with flow through a contraction into the heated section of the channel. In the rectangular channel without ejection, the heat transfer coefficients are uniform across the span of the channel; however, with coolant ejection, the heat transfer coefficients increase near the ejection slots. In addition, in the trapezoidal channels, the heat transfer coefficients are uniform across the cross-section of the smooth channel. When coolant is extracted for trailing edge ejection, the outer surface sees the most significant heat transfer enhancement. The outer surface of the smooth, trapezoidal channel is most profoundly affected by the entrance condition, and the effect of the entrance condition is marginal in trapezoidal channels with ribs and ejection.

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Turner, Edward J., Matthew F. Bogdan, Tyler M. O’Connell, Wing F. Ng, Kevin T. Lowe, Loren Crook, Richard Stevenson i James Roberts. "Measurement Drift in 3-Hole Yaw Pressure Probes From 5 Micron Sand Fouling at 1050° C". W ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90880.

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Abstract The present paper focuses on the resilience of 3-hole pressure probes to hot sand fouling in turbomachinery environments. These probes are utilized inside jet engine hot sections for diagnostics and flow characterization. Ingestion of sand and other particulates pose a significant risk to hot section components and measurement devices in gas turbine engines. In this study, wedge, cylindrical, and trapezoidal probes were exposed to hot section turbine aerothermal conditions of 1050°C and 65–70 m/s flow velocity and fouled with 0–5 μm Arizona Road Dust (ARD). Sand accumulated more rapidly on the surface of the trapezoidal and cylindrical probe geometries than on the surface of the wedge probe geometry. Probe calibrations following sand fouling were performed in an ambient temperature, open air, calibration jet at Mach 0.3 and 0.5. Calibration curves using non-dimensional coefficients were used to assess probe error in yaw angle due to sand fouling. Probe error was based on each probe’s ability to accurately measure flow direction over a flow angle range of [−10°, 10°]. On average, the probes displayed greater error at Mach 0.5 than Mach 0.3. The wedge probe performed the best after sand fouling and displayed a maximum error of less than ±2° in yaw angle. In contrast, the cylindrical probe performed the worst after sand fouling and displayed maximum errors of more than ±8° in yaw angle. Transient response did not change notably with sand fouling.

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Madhavan, Srivatsan, Prashant Singh i Srinath V. Ekkad. "Effect of Rotation on Heat Transfer in AR = 2:1 and AR = 4:1 Channels Connected by a Series of Crossover Jets". W ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-59426.

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Abstract Detailed heat transfer measurements using transient liquid crystal thermography were performed on a novel cooling design covering the mid-chord and trailing edge region of a typical gas turbine blade under stationary and rotating conditions. The test section comprised of two channels with aspect ratio (AR) of 2:1 (mid-chord) and 4:1 (trailing edge), where the coolant was fed into the AR = 2:1 channel from the root. Rib turbulators with a pitch-to-rib height ratio (p/e) of 10 and rib height-to-channel hydraulic diameter ratio (e/Dh) of 0.075 were placed in the AR = 2:1 channel at an angle of 60° relative to the direction of flow. The coolant after entering this section was routed to the AR = 4:1 section through a set of crossover jets. The purpose of the crossover jets was to induce sideways impingement onto the pin fins that were placed in the 4:1 section to enhance heat transfer. The 4:1 section had a realistic trapezoidal shape that mimics the trailing edge of an actual gas turbine blade. The pin fins were arranged in a staggered array with a center-to-center spacing of 2.5 times the pin diameter in both spanwise and streamwise directions. The trailing edge section consisted of both radial and cutback exit holes for flow exit. Experiments were performed for a Reynolds number (ReDh(AR = 2:1)) of 20,000 at Rotation numbers (RoDh(AR = 2:1)) of 0, 0.1 and 0.14. The channel averaged heat transfer coefficient on trailing side was ∼28% (AR = 2:1) and ∼7.6% (AR = 4:1) higher than the leading side for Rotation number (Ro) of 0.1. It is shown that the combination of crossover jets and pin-fins can be an effective method for cooling wedge shaped trailing edge channels over axial cooling flow designs.

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