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Wang, Hejian, Bo Liu, Xiaochen Mao, Botao Zhang i Zonghao Yang. "Combined Flow Control Strategy Investigation for Corner Separation and Mid-Span Boundary Layer Separation in a High-Turning Compressor Cascade". Entropy 24, nr 5 (19.04.2022): 570. http://dx.doi.org/10.3390/e24050570.
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To comprehensively control the corner separation and mid-span boundary layer (BL) separation, this study proposed and evaluated two new flow control configurations. One is a slotted configuration composed of blade-end and whole-span slots, and the other is a combined configuration with end-wall BL suction and whole-span slot. Additionally, the adaptability of the combined configuration to the lower blade solidity (c/t) condition was verified. The results indicate that both the slotted configuration and combined configuration can eliminate the mid-span BL separation, but a better reduction in the corner separation can be observed in the combined configuration. The two configurations can remove the concentrated shedding vortex and reduce the passage vortex (PV) for the datum cascade, but the wall vortex (WV) will be generated. By contrast, the combined configuration has weaker WV and PV than the slotted configuration, which contributes to further reducing the corner separation. In the combined configuration with a c/t of 1.66 and 1.36, the total pressure loss is reduced by 38.4% and 42.1%, respectively, on average, while the averaged static pressure rise coefficient is increased by 16.2% and 17.6%, respectively. This is advantageous for enhancing the working stability and pressure diffusion capacity for compressors. Besides this, the combined configuration with lower c/t can achieve a stronger pressure diffusion capacity and smaller loss than the higher c/t datum cascade. Therefore, the combined configuration is advantageous to the improvement of the aero-engine thrust-to-weight ratio through decreasing the compressor single-stage blade number.
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Raut, Shruti Diliprao, i Prof Vishal Sapate. "Comparative Study on Seismic Analysis of Multistorey Building Using STAD Pro - A Review". International Journal for Research in Applied Science and Engineering Technology 11, nr 7 (31.07.2023): 1673–75. http://dx.doi.org/10.22214/ijraset.2023.54932.
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Abstract: This literature review provides a comprehensive analysis of the behavior of buildings with concave corners in earthquake-prone areas. The study emphasizes the impact of irregularities in building planning, particularly in concave corners, on the structural performance during seismic events. Findings from various research studies highlight the necessity for detailed and comprehensive analyses, including both linear and non-linear dynamic analyses, to accurately understand the behavior and response of such structures. The research underscores the significance of regular building configuration to enhance earthquake resilience, especially in regions susceptible to seismic activity. Buildings with concave corners are found to be more vulnerable to earthquake damage compared to structures with regular configurations. Additionally, larger structures and longer overhangs are shown to result in increased stress and pressure on the reentrant corner region. Overall, the literature review emphasizes the importance of further research in the field of concave corner irregularities to develop effective seismic design and mitigation strategies. A deeper understanding of the behavior and response of buildings with concave corners will contribute to the development of safer and more resilient structures in earthquake-prone areas. Comprehensive and advanced analyses are recommended to accurately assess the performance of such buildings and to establish guidelines for their proper design and construction.
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YIMER, ADAL MENGESHA, i ASHOK KUMAR AHUJA. "Effect of Corner Configuration on Wind Pressure Distribution on Tall Buildings". INTERNATIONAL JOURNAL OF EARTH SCIENCES AND ENGINEERING 10, nr 02 (26.04.2017): 418–26. http://dx.doi.org/10.21276/ijee.2017.10.0243.
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Toribio, Jesús, Beatriz González, Juan-Carlos Matos i Óscar Mulas. "Stress Intensity Factors for Embedded, Surface, and Corner Cracks in Finite-Thickness Plates Subjected to Tensile Loading". Materials 14, nr 11 (25.05.2021): 2807. http://dx.doi.org/10.3390/ma14112807.
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The aim of this study is to obtain the stress intensity factor (SIF) along the crack front of elliptical cracks located in finite-thickness plates subjected to imposed displacement or applied tensile load, for different crack geometries (relative depths and aspect ratios) and crack configurations (embedded, surface, and corner). The SIF was calculated from the J-integral, obtained by the finite element method. The results show how the SIF grows with the increase in the relative crack depth and with the decrease in the aspect ratio, with the corner crack being the most dangerous configuration and the embedded crack the most favorable configuration. By increasing the plate length, the SIF rises when the plate is under imposed displacement and decreases when the plate is subjected to applied tensile load, both cases tending towards the same SIF curve.
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Davey, Robert C., Raphaël C. Assier i I. David Abrahams. "An Efficient Semi-Analytical Scheme for Determining the Reflection of Lamb Waves in a Semi-Infinite Elastic Waveguide". Applied Sciences 12, nr 13 (25.06.2022): 6468. http://dx.doi.org/10.3390/app12136468.
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The classical problem of reflection of Lamb waves from a free edge perpendicular to the centre line of an elastodynamic plate is studied. It is known that Lamb wave expansions for the displacement and stress fields poorly represent the irregular behaviour near corners, leading to the slow convergence of a series of such waves. The form of the irregularity for an elastodynamic corner is derived asymptotically, and a new solution method, which incorporates this corner behaviour analytically, is then implemented. Results are presented showing that this new approach represents the near-field and far-field behaviour very accurately, requiring very modest numbers of Lamb wave and corner modes. Further, it is revealed that the method can recover the trapped-mode phenomenon encountered in this configuration at the Lamé frequency and a specific Poisson’s ratio that we find to be approximately 0.224798.
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Adeeb, Ehsan, Basharat Ali Haider i Chang Hyun Sohn. "Influence of rounded corners on flow interference between two tandem cylinders using FVM and IB-LBM". International Journal of Numerical Methods for Heat & Fluid Flow 28, nr 7 (2.07.2018): 1648–63. http://dx.doi.org/10.1108/hff-08-2017-0319.
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Purpose The purpose of this study is to numerically investigate the influence of corner radius on the flow around two square cylinders in tandem arrangements at a Reynolds number of 100. Design/methodology/approach Six models of square cylinders with corner radii R/D = 0.0, 0.1, 0.2, 0.3, 0.4 and 0.5 (where R denotes the corner radius and D denotes the characteristic dimension of the body) were studied using an immersed boundary-lattice Boltzmann method, and the results were compared with those obtained using a two-dimensional unsteady finite volume method. The cylinders were mounted in a tandem configuration (1.5 ≤ L/D ≤ 10 where L denotes the in-line separation between the cylinder centers). The simulated models were quantitatively compared to the aerodynamic force coefficients and Strouhal number. Furthermore, qualitative analysis is presented in the form of flow streamlines and vorticity contours. Findings The R/D and L/D values were varied to observe the variation in the flow characteristics in the gap and wake regions. The numerical results revealed two different regimes over the spacing range. The drag force on the downstream cylinder was negative for all corner radii values when the cylinders were placed at L/D = 3.0 (a single-body system). Subsequently, a sudden increase was observed in the aerodynamic forces (drag and lift) when L/D increased. A different gap value was identified in the transformation from a single-body to a two-body system for different corner radii. To verify the single-body system, a simulation was carried out with a single cylinder having a longitudinal geometric dimension equal to the tandem arrangement (L/D + D). Furthermore, in a single-body regime, the total drag of a tandem cylinder was less than that of a single cylinder, thus demonstrating the benefits of using tandem structures. A significant reduction in the aerodynamic forces and drag force was achieved by rounding the sharp corners and placing the cylinders in close proximity. An appropriate configuration of the tandem cylinders with a rounded corner of R/D = 0.4 and 0.5 at L/D = 3.0 and the range is enhanced to L/D = 4.0 for 0.0 ≤ R/D < 0.4 to achieve adequate drag reduction. Originality/value To the best of the author’s knowledge, there is a paucity of studies examining the effect of corner radius on bluff bodies arranged in a tandem configuration.
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Mecha, Peter, Fang Yali, Emmanuel Awuah, Odero Alele, Jiayu Zhang i Chen Kunjie. "Deflectors as the performance booster component in designing a side-ventilated heat pump cabinet dryer for vegetables". Thermal Science, nr 00 (2023): 130. http://dx.doi.org/10.2298/tsci230305130m.
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Unbalanced drying air and temperature distribution in a dryer is among the major cause of non-uniformity in moisture content of dried food. Thus, the distribution of air and temperature in corner-ended, corner-ended with deflector, curved-ended, and curved-ended with defectors were investigated. Velocities used were 2 ms-1, 4 ms-1, and 6 ms-1 while temperatures ranged from 40?C -60?C. The design with lowest deviations in simulated and actual drying parameters was fabricated to dry mushrooms. Results showed that adding deflectors improved drying air and temperature distribution. The corner-ended with deflector dryer configuration was superior to other designs, with 6 ms-1 and 60?C being optimal. A mass transfer simulation of the corner-ended with deflectors configuration had moisture evaporate from 1.00 to 0.11 in 2000 seconds. A comparison of moisture ratios in the two dryers gave R? = 0.9965, which was acceptable. Drying at 55?C-60?C gave the best lentinan content and rehydration ratio for mushrooms.
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Green, Ben. "Lower bounds for corner-free sets". New Zealand Journal of Mathematics 51 (29.07.2021): 1–2. http://dx.doi.org/10.53733/86.
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We show that for infinitely many $N$ there is a set $A \subset [N]^2$ of size $2^{-(c + o(1)) \sqrt{\log_2 N}} N^2$ not containing any configuration $(x, y), (x + d, y), (x, y + d)$ with $d \neq 0$, where $c = 2 \sqrt{2 \log_2 \frac{4}{3}} \approx 1.822\dots$.
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Ouyang, Hong Yu, i Bi Feng Chen. "Street Corner Space Landscape Design". Applied Mechanics and Materials 641-642 (wrzesień 2014): 489–92. http://dx.doi.org/10.4028/www.scientific.net/amm.641-642.489.
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Through to the street corner space of the urban residents' daily life experience of social investigation, put forward the guiding principles for the location of corner space landscape design can identification, space versatility, use safety, environment suitability principle. Conclusion from the location awareness, zoning, personality construction and processing in the detail design method. For waterscape design, plant configuration, pavement and recreation facilities such as the design of the landscape elements to improve the edge space landscape quality present situation, the cultural connotation and aesthetic value, improve environment conducive to the development of spiritual civilization.
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Jaeger, Rick, Katharina Tondera, Carolyn Jacobs, Mark Porter i Neil Tindale. "Numerical and Physical Modeling to Improve Discharge Rates in Open Channel Infrastructures". Water 11, nr 7 (10.07.2019): 1414. http://dx.doi.org/10.3390/w11071414.
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This paper presents the findings of a study into how different inlet designs for stormwater culverts increase the discharge rate. The objective of the study was to develop improved inlet designs that could be retro-fitted to existing stormwater culvert structures in order to increase discharge capacity and allow for changing rainfall patterns and severe weather events that are expected as a consequence of climate change. Three different chamfer angles and a rounded corner were simulated with the software ANSYS Fluent, each of the shapes tested in five different sizes. Rounded and 45 ∘ chamfers at the inlet edge performed best, significantly increasing the flow rate, though the size of the configurations was a critical factor. Inlet angles of 30 ∘ and 60 ∘ caused greater turbulence in the simulations than did 45 ∘ and the rounded corner. The best performing shape of the inlet, the rounded corner, was tested in an experimental flume. The flume flow experiment showed that the optimal inlet configuration, a rounded inlet (radius = 1/5 culvert width) improved the flow rate by up to 20% under submerged inlet control conditions.
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Rahayu, Rita Laksmitasari, Triyadi Sugeng S i Lily Tambunan. "Relationship of Building Form with Damage Pattern and Damage Level". IOP Conference Series: Earth and Environmental Science 1091, nr 1 (1.11.2022): 012019. http://dx.doi.org/10.1088/1755-1315/1091/1/012019.
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The level of damage to the building is influenced by the configuration of the building plan with the angle of re-entrant and the pattern of damage. Architects need to know and understand the pattern of building damage and the configuration of hospital plans with an architectural approach. A certain level of damage has an impact on the safety of the lives of patients and health workers. The method used is a quantitative method with 2 steps, namely literature study and correspondence. The technique used is a visual identification technique from photographs in 28 earthquake-related journals with 108 cases. There is a significant relationship between the shape of the re-entrant angled building and the level of damage caused by the earthquake. The configuration of the building plan with re-entrant angles U and L is closely related to the level of heavy structural damage (level 4). The pattern of structural damage in the configuration of the re-entrant corner plan U, L, H occurs in the re-entrant corner and the outside of the building. The hospital as a vital building must use a floor plan configuration without a re-entrant angle.
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Hatami-Hanza, H., P. L. Chu i J. Nayyer. "Low-loss optical waveguide-bend configuration with curved corner reflector". Electronics Letters 28, nr 25 (3.12.1992): 2283–85. http://dx.doi.org/10.1049/el:19921469.
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Moulas, Evangelos, Mark T. Brandon, Joshua D. Vaughan Hammon i Stefan M. Schmalholz. "On backflow associated with oceanic and continental subduction". Geophysical Journal International 227, nr 1 (26.06.2021): 576–90. http://dx.doi.org/10.1093/gji/ggab246.
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SUMMARY A popular idea is that accretion of sediment at a subduction zone commonly leads to the formation of a subduction channel, which is envisioned as a narrow zone located above a subducting plate and filled with vigorously circulating accreted sediment and exotic blocks. The circulation can be viewed as a forced convection, with downward flow in the lower part of the channel due to entrainment by the subducting plate, and a ‘backflow’ in the upper part of the channel. The backflow is often cited as an explanation for the exhumation of high-pressure/low-temperature metamorphic rocks from depths of 30 to 50 km. Previous analyses of this problem have mainly focused on the restricted case where the walls bounding the flow are artificially held fixed and rigid. A key question is if this configuration can be sustained on a geologically relevant timescale. We address this question using a coupled pair of corner flows. The pro-corner accounts for accretion and deformation directly above the subducting plate, and the retro-corner corresponds to a deformable region in the overlying plate. The two corners share a medial boundary, which is fully coupled but is otherwise free to rotate and deform. Our results indicate that the maintenance of a stable circulating flow in a narrow pro-corner (<15°) requires an unusually large viscosity ratio, μretro/μpro > 103. For lower viscosity ratios, the medial boundary would rotate rearwards, converting the initially narrow pro-corner into an obtuse geometry. For a stable narrow corner, we show that the backflow within the corner is caused by downward convergence of the incoming flow and an associated downward increase in dynamic pressure, which reaches a maximum at the corner point. The total pressure is thus expected to be much greater than predicted using a lithostatic gradient, which means that estimates of depth from metamorphic pressure would have to be adjusted accordingly. In addition, we show that the velocity fields associated with a forced corner flow and a buoyancy-assisted channel flow are nearly identical. As such, structural geology studies are not sufficient to distinguish between these two processes.
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Díaz-Calderón, S. F., J. A. Castillo i G. Huelsz. "Indoor air quality evaluation in naturally cross-ventilated buildings for education using age of air". Journal of Physics: Conference Series 2069, nr 1 (1.11.2021): 012182. http://dx.doi.org/10.1088/1742-6596/2069/1/012182.
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Abstract Natural ventilation (NV) is a strategy of bioclimatic design to promote hygrothermal comfort and indoor air quality (IAQ). Nowadays, COVID-19 pandemic highlights the review of ventilation standards. In Mexico, the IAQ standard states a minimum of 6 ACH for educational buildings. ACH considers NV as an ideal piston flow and does not provide information of indoor airflow distribution. In this work, new age of air associated parameters are proposed, considering the indoor airflow distribution: the air renovation per hour (ARH) and the renovation parameter R. An isolated educational building located in a rural region is studied. Four window configurations of cross-ventilation are considered. All configurations have one windward window located at bottom. The configurations axial and upward have one leeward window at bottom and top, respectively. While, configurations corner and upward corner have one lateral side window at bottom and top, respectively. A CFD model of the educational building is validated with experiments. The axial configuration has the best performance according to ACH, nevertheless has the worst performance according to ARH and R. The results show that NV evaluation using ACH can lead to wrong decisions. An improvement of NV standard with the age of air associated parameters is recommended.
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Pereira, Juan Carlos, Herman Borovkov, Fidel Zubiri, Mari Carmen Guerra i Josu Caminos. "Optimization of Thin Walls with Sharp Corners in SS316L and IN718 Alloys Manufactured with Laser Metal Deposition". Journal of Manufacturing and Materials Processing 5, nr 1 (5.01.2021): 5. http://dx.doi.org/10.3390/jmmp5010005.
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In this work, the manufacture of thin walls with sharp corners has been optimized by adjusting the limits of a 3-axis cartesian kinematics through data recorded and analyzed off-line, such as axis speed, acceleration and the positioning of the X and Y axes. The study was carried out with two powder materials (SS316L and IN718) using the directed energy deposition process with laser. Thin walls were obtained with 1 mm thickness and only one bead per layer and straight/sharp corners at 90°. After adjusting the in-position parameter G502 for positioning precision on the FAGOR 8070 CNC system, it has been possible to obtain walls with minimal accumulation of material in the corner, and with practically constant layer thickness and height, with a radii of internal curvature between 0.11 and 0.24 mm for two different precision configuration. The best results have been obtained by identifying the correct balance between the decrease in programmed speed and the precision in the positioning to reach the point defined as wall corner, with speed reductions of 29% for a programmed speed of 20 mm/s and 61% for a speed of 40 mm/s. The walls show minimal defects such as residual porosities, and the microstructure is adequate.
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Zhou, Jia Kai, Yi Dong Bao, Wan Lin Zhou, Jing Cui i Hui Ting Wang. "The Refinement Algorithm of Blank Outline Based on One-Step Inverse Analysis". Key Engineering Materials 725 (grudzień 2016): 517–22. http://dx.doi.org/10.4028/www.scientific.net/kem.725.517.
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Blank dimensions and outlines can be obtained in one-step inverse analysis. Applying more accurate mesh will achieve more precise outlines while usually lead to the increase of computation time. To ensure operation efficiency, this paper proposes a new blank outline refinement algorithm based on one-step inverse analysis. Firstly, the initial configuration is obtained from the final configuration by one-step inverse analysis. Secondly, all outline nodes is projected to the nearest element in the final configuration. Thirdly, according to the position of projected nodes in the element, the coordinate of outline nodes in the initial configuration is achieved through mapping. Finally the number of outline nodes is increased in rounded corners, the coordinate of added nodes are calculated through interpolation. At last all outlines corresponding to characteristic lines of part surface are acquired. Using A-pillar as an example, outlines are calculated by the refinement algorithm and commercial software. It proves that under the same mesh quality, outlines obtained by refinement algorithm become more accurate and smooth, especially in rounded corner. The results can contribute to judge the rationality of blank shape and improve the final part forming property. This algorithm refines the accuracy of outlines and ensures the efficiency of one-step inverse analysis.
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Lyu, Weidong, Hefu Pu i Jiannan (Nick) Chen. "Thermal Performance of an Energy Pile Group with a Deeply Penetrating U-Shaped Heat Exchanger". Energies 13, nr 21 (6.11.2020): 5822. http://dx.doi.org/10.3390/en13215822.
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This study presents a novel heat exchanger configuration, called a deeply penetrating U-shaped configuration, for energy piles. The outlet water temperature, temperature variation along the tube, and heat transfer rate are simulated and computed using Comsol Multiphysics software. The simulations are for the cooling mode. The proposed configuration is compared with traditional U-shaped and W-shaped configurations to prove its superiority. The thermal performance of the pile group is compared with that of a single pile to investigate the effects of the pile group on the heat transfer. A parametric analysis is performed to investigate the effects of several important parameters (i.e., pile spacing, pile diameter, soil type, and thermal parameters) on the heat transfer performance of an energy pile group with the proposed deeply penetrating U-shaped configuration. The results indicate that the corner pile indicates a nonnegligible heat transfer rate 6.8% and 9.9% higher than the central pile in quincuncial and squared arrangements. Purely from the standpoint of thermal performance, the pile spacing is recommended to be more than 6.8 times the pile diameter to reduce the influence of the pile group on the heat transfer capacity.
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Wang, Hejian, Yanshan Qing, Bo Liu i Xiaochen Mao. "Corner Separation Control Using a New Combined Slotted Configuration in a High-Turning Compressor Cascade under Different Solidities". Energies 14, nr 12 (8.06.2021): 3376. http://dx.doi.org/10.3390/en14123376.
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In order to comprehensively control the corner separation and the blade trailing edge (TE) separation in a high-turning compressor stator cascade, this research proposes a new combined slotted configuration consisting of one full-span slot and two blade-end slots. Taking into account the effect of the blade solidity, the performance of the original cascade and the combined slotted cascade was calculated and evaluated in a wide incidence angle range at two blade solidities. The results indicated that the blade loading and the corner separation range of the original cascade becomes larger as the blade solidity decreases from 1.66 to 1.36, which leads to higher total pressure loss and lower pressure diffusing capacity under positive incidence angles. The low-momentum fluid in the boundary layer can be significantly re-energized by the high-momentum blade-end and full-span slots jets, hence the combined slotted configuration can eliminate the blade TE separation and reduce the corner separation remarkably in the full incidence angle range at the two blade solidities. By adopting the combined slotted configuration, the total pressure loss, turning angle and static pressure coefficient of the original cascade can be increased by −23.2%, 2.7° and 4.7% on average, respectively, when the blade solidity is 1.66, while they can be increased by −27.7%, 3.3° and 7.6% on average, respectively, when the blade solidity is 1.36. The combined slotted configuration has a significant adaptability to the low blade solidity (or high loading) condition and it shows a certain potential in increasing the aeroengine thrust-to-weight ratio by decreasing the compressor single-stage blade number.
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Li, Yan-feng, Ying He i Long-sheng Bao. "Mechanical Characteristics of the Main Tower of a Polygonal Line Tower Cable-Stayed Bridge". Advances in Civil Engineering 2020 (8.10.2020): 1–12. http://dx.doi.org/10.1155/2020/7090426.
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The main tower of a polygonal line tower cable-stayed bridge bears most of the axial force transmitted by the stay cable and also bears the moment under certain unbalanced load. For a polygonal line tower cable-stayed bridge, the main tower has a bending corner and the direction of huge axial force transmission changes at this bending corner where the axis of the main tower changes. This study examined a cable-stayed bridge with a single cable plane in Shenyang and used model test and finite element numerical comparative analysis to analyze the mechanical properties of the key parts, including the main tower bending corner of the concrete polygonal line tower. The results show a serious stress concentration phenomenon at the bending corner of the main tower but a small range of high stress area. After the stiffening plate is set at the corner, the stress concentration coefficient of the bending corner section decreases and the stiffening plate eliminates the out-of-plane bending phenomenon of the tower wall at the middle span side as vertical tensile stress occurs in the stiffener at the bending corner. Based on these results, the design should be improved to increase the angle of the stiffening plate corner and appropriately strengthen the configuration of the vertical main tensile steel bar and the surface anticracking steel mesh inside the stiffening plate.
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Gray, T. G. F., F. Tournery i J. Spence. "Analysis of stress concentration factors for stepped plates based on a crack tip stress intensity approach". Journal of Strain Analysis for Engineering Design 31, nr 3 (1.05.1996): 197–204. http://dx.doi.org/10.1243/03093247v313197.
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The analytical equations given for stress concentration factors are based on the results of finite element analysis of stepped plates subject to uniaxial tension loading. The fillet radii at the stepped transitions were varied over a wide range, leading to elastic stress concentration factors between 1.1 and 8.3 (net stress basis). The parametric equations depend on the previously described concept of a ‘notch configuration factor’. This is similar to the crack configuration factor or compliance function used to modify the basic crack tip stress intensity solutions in the case of finite width or other problems. In the present case of the stepped plate, an energy approach was used to relate the sharp corner stress field to the corresponding sharp crack field, leading to a ‘sharp corner configuration factor’. This factor was then applied to the equation for the stress concentration factor at an elliptical hole in an infinite plate, to give a simple analytical expression for the stepped plate with a radiused fillet. The basic expression was refined further to improve the quality of fit, to an accuracy of 2 per cent with respect to the finite element models.
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Chakraborty, Sadananda, i Dipankar Bose. "Improvement of Die Corner Inaccuracy of Inconel 718 Alloy Using Entropy Based GRA in WEDM Process". Advanced Engineering Forum 20 (styczeń 2017): 29–41. http://dx.doi.org/10.4028/www.scientific.net/aef.20.29.
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Wire Electric Discharge Machining is one of the non-traditional machining process to develop and generate many complicated shapes with very much accuracy. Improper selection of cutting parameters may result in erroneous configuration and shapes. When cutting curve profile in WEDM process, it has been found out that the magnitude of corner inaccuracy in terms of uncut area at the corner of the die is much higher than the corner inaccuracy at the corner of the punch due to the excess material removal. In this study entropy based grey relation analysis has been used to identify the optimal cutting parameter for WEDM process. ANOVA has been adopted to distinguish the most consequential factors. Inconel 718 has been used as a work-piece material which is a new advance material and it has wide range of industrial application. The characteristics of the machined surfaces of Inconel 718 alloy have also been analyzed through scanning electron microscope (SEM).
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Zhou, Yue, Shun-Chao Qi, Gang Fan, Ming-Liang Chen i Jia-Wen Zhou. "Topographic Effects on Three-Dimensional Slope Stability for Fluctuating Water Conditions Using Numerical Analysis". Water 12, nr 2 (24.02.2020): 615. http://dx.doi.org/10.3390/w12020615.
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With recent advances in calculation methods, the external factors that affect slope stability, such as water content fluctuations and self-configuration, can be more easily assessed. In this study, a three-dimensional finite element strength reduction method was used to analyze the stability of three-dimensional slopes under fluctuating water conditions. Based on soil parameter variations in engineering practice, the calculation models were established using heterogeneous layers, including a cover layer with inferior properties. An analysis of seepage, deformation and slope stability was carried out with 27 different models, including three different slope gradients and nine different corner angles under five different hydraulic conditions. The failure mechanism has been shown to be closely related to the change in matric suction of unsaturated soils and the geometric slope configuration. Finally, the effect of geometry (surface shape, turning corner and slope gradient) and water (fluctuations) on slope stability are discussed in detail. Emphasis is given to comparing safety factors obtained considering or ignoring matric suction.
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Polavarapu, Prasad L., Pranati K. Bose, Allan J. Rilling, Henry Buijs i Jean Rene Roy. "Development and Evaluation of a Polarization-Division Interferometer with Cube Corner Mirrors". Applied Spectroscopy 56, nr 12 (grudzień 2002): 1626–32. http://dx.doi.org/10.1366/000370202321116129.
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The use of cube corner mirrors in conventional Fourier transform infrared (FT-IR) spectrometers has led to increased stability and enhanced signal-to-noise ratio. Polarization-division interferometers for the mid- and far-infrared regions, however, were based on either the Martin–Puplett design, which utilizes roof-top mirrors, or the Michelson interferometer design, which utilizes the plane mirrors. In this paper, we report the development of a polarization-division interferometer with cube corner mirrors. In this design, two different wire-grid beamsplitters are used for the division and recombination of polarized light. The performance of this new instrument has been evaluated by measuring the linear dichroism of oriented films and the circular dichroism of isotropic samples. This development facilitates the adaptation of commonly used FT-IR spectrometers with cube corner mirrors for polarization-division configuration.
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Tavana, Hossein, Kayvan Aghabayk i Karen Boyce. "A Comparative Study of Flows Through Funnel-Shaped Bottlenecks Placed in the Middle and Corner". Collective Dynamics 6 (16.01.2022): 1. http://dx.doi.org/10.17815/cd.2021.128.
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Upon exiting buildings, theatres, and stadiums, which house a great number of people, egress points can act as bottlenecks, resulting in crowded exits and decreased flows. Most studies investigating flow have been conducted in either narrow bottlenecks (doors) or funnel shape bottlenecks, with the latter investigating bottlenecks placed in the middle of the walkway. This study investigates, for the first time, crowd flow through funnel-shaped bottlenecks placed in the corner of the walkway and makes comparisons with similar bottlenecks of the same length, entrance and exit width placed in the middle of the walkway. The entry width and exit width of the bottlenecks were 3 m and 1 m respectively, with lengths varying from 1 m to 4 m; they continued into a 10 m corridor. Ninety-four participants of various ages were observed moving through each of the configurations. The results indicated that using funnel-shaped bottlenecks in the middle of the walkway increased the flow rate significantly compared to the corner in bottlenecks with 2 m and 3 m lengths. This is contrary to what some other researchers have found for narrow bottlenecks placed in the middle and corner of a wall, although it is recognised that the configuration of funnel-shaped bottlenecks makes the comparison more complex and further work is required in this area. Notwithstanding these results are considered valuable for consideration when designing egress points and corridors in complex buildings such as metro and train stations.
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Güneyisi, Esra Mete, i Ayşegül Gültekin. "Nonlinear Behaviour of Mid-rise Steel Buildings with Gate Braced Frames". Open Civil Engineering Journal 11, nr 1 (30.06.2017): 475–84. http://dx.doi.org/10.2174/1874149501711010475.
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Off-center or gate braced frames are a special configuration of inverted V bracing with non-straight diagonal members that are made of two elements connected to the corner of the frame by another member. This arrangement is characterized by an eccentricity of the intercepted bracing as respect to the straightness of the theoretical working length of the diagonal members in chevron configuration. These types of braced frames permit larger openings with significant advantages in terms of architectural functionality. The seismic performance of gate braced frames differs from that of traditional chevron braced frames, because of the out-of-straightness eccentricity of bracing members and the position of the corner-to-brace connecting element. Therefore, in this paper, a numerical parametric study based on both nonlinear static pushover and dynamic time-history analyses is presented and discussed in order to examine the influence of brace-to-brace detailing on seismic response of this structural typology. The results showed that the initial stiffness, the strength and the interstorey drift demand are very sensitive to the out-of-straightness eccentricity of bracing.
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Najam, Faraz, i Yun Yu. "Optimization of Line-Tunneling Type L-Shaped Tunnel Field-Effect-Transistor for Steep Subthreshold Slope". Electronics 7, nr 11 (24.10.2018): 275. http://dx.doi.org/10.3390/electronics7110275.
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The L-shaped tunneling field-effect-transistor (LTFET) has been recently introduced to overcome the thermal subthreshold limit of conventional metal-oxide-semiconductor field-effect-transistors (MOSFET). In this work, the shortcomings of the LTFET was investigated. It was found that the corner effect present in the LTFET effectively degrades its subthreshold slope. To avoid the corner effect, a new type of device with dual material gates is presented. The new device, termed the dual-gate (DG) LTEFT (DG-LTFET), avoids the corner effect and results in a significantly improved subthreshold slope of less than 10 mV/dec, and an improved ON/OFF current ratio over the LTFET. The DG-LTFET was evaluated for different device parameters and bench-marked against the LTFET. This work presents the optimum configuration of the DG-LTFET in terms of device dimensions and doping levels to determine the best subthreshold, ON current, and ambipolar performance.
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Qin, Yong, Yanping Song, Ruoyu Wang i Huaping Liu. "Numerical Investigation of Three-dimensional Separation Control on a High-speed Compressor Stator Vane with Tailored Synthetic Jet". International Journal of Turbo & Jet-Engines 37, nr 4 (18.11.2020): 383–97. http://dx.doi.org/10.1515/tjj-2017-0036.
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AbstractA numerical study on the performance of synthetic jet for flow separation control on a high-speed compressor stator vane is performed. Four control schemes including full-span and part-span configurations are investigated at both design and off-design conditions. Results indicate that both full-span and part-span schemes could effectively delay flow separation and reduce total pressure loss for the compressor stator vane, the adaptability of the flow control under off-design conditions is also validated. Within the investigated incidence range, the full-span configuration is able to gain the most significant performance improvement, by which a maximum loss reduction of 23.8 % is obtained at i=2 deg. The part-span configuration could reorganize the vortex structures more efficiently and cut off the interaction between the ring-like vortex and the passage vortex, thus improving its performance in the corner region. In terms of flow control efficiency, the part-span configurations turn out to be more superior, where the highest control efficiency of 614.0 % is achieved at i=0 deg with the total height of the actuator being 40 %H. The flow control efficiency for all the schemes is higher than 100 % within the whole operating range, demonstrating a promising prospect for the application of synthetic jet in axial compressors.
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Kumar, Asadi Suresh, i Vyza Usha Reddy. "Performance Evaluation of PV Panel Configurations Considering PSC’s for PV Standalone Applications". Journal Européen des Systèmes Automatisés 54, nr 6 (29.12.2021): 847–52. http://dx.doi.org/10.18280/jesa.540606.
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One of the major concerns for continuous solar photovoltaic (PV) generation is partial shading. The movement of clouds, shadow of buildings, trees, birds, litter and dust, etc., can lead to partial shadow conditions (PSCs). The PSCs have caused inconsistent power losses in the PV modules. This leads to a shortage of electricity production and the presence in the PV curve of several peaks. One of the simplest solutions to PSC’s is the PV configurations. The objective of this paper is modelling and simulation of solar PV system in various shading scenarios for KC200GT 200 W, 5 x 5 configurations that includes Series/Parallel (SP), Total-Cross-Tied (TCT), Triple-Tied (TT), Bridge-Link (BL) configurations. Real time PSC’s such as corner, center, frame, random, diagonal, right side end shading conditions are evaluated under all PV array configurations. A comparative analysis is carried out for the parameters such as open circuit voltage, short circuit current, maximum power point, panel mismatch losses, fill factor, efficiency under all PV configurations considering PSC’s. From the comparison analysis best configuration will be presented.
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Caiazzo, Fabrizia, Vittorio Alfieri, Antonello Astarita, Antonino Squillace i Giuseppe Barbieri. "Investigation on laser welding of Ti-6Al-4V plates in corner joint". Advances in Mechanical Engineering 9, nr 1 (styczeń 2017): 168781401668554. http://dx.doi.org/10.1177/1687814016685546.
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The article deals with laser beam welding of Ti-6Al-4V plates for aerospace applications. A number of trials are conducted to weld 3-mm-thick plates in corner joint configuration; a specific device for clamping and shielding to prevent oxidation is used. Autogenous welding is investigated, the joint being accessed from the outside, as a butt-welded corner joint. Referring to international standards, the results are first discussed in terms of geometry of the welding bead in the cross-section since titanium alloys are reported to be notch sensitive. Moreover, microstructure and microhardness are investigated. An optimum processing condition is suggested in order to perform laser beam welding with minimal undercut and porosity.
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Zhou Mu, 周沐, 王晓峰 Wang Xiaofeng i 谭吉春 Tan Jichun. "Corner-Pumped Configuration Optimization and the Gain Medium Design of Radiation-Balanced Laser". Chinese Journal of Lasers 35, nr 10 (2008): 1473–76. http://dx.doi.org/10.3788/cjl20083510.1473.
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Liu, Baojie, Hongwei Wang, Huoxing Liu, Hongjun Yu, Haokang Jiang i Maozhang Chen. "Experimental Investigation of Unsteady Flow Field in the Tip Region of an Axial Compressor Rotor Passage at Near Stall Condition With Stereoscopic Particle Image Velocimetry". Journal of Turbomachinery 126, nr 3 (1.07.2004): 360–74. http://dx.doi.org/10.1115/1.1748367.
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Stereoscopic particle image velocimetry (SPIV) was applied to a large-scale low-speed compressor facility with the configuration of the two CCD cameras placed on each side of the light sheet to make the measurement of the vortices in the cross flow section possible and to avoid the disturbance from the light sheet containing periscope-type probe. Instantaneous velocity and vorticity distributions were successfully documented at the tip region of the rotor at near stall condition. The measurement results clearly revealed the generation and evolution of the tip leakage vortex. Comparing to design condition, the tip leakage vortex at near stall condition generates and breaks down earlier and interacts more violently with mainstream, which causes large blockage and much loss. Whether corner vortex exists or not is the primary difference between near stall and design condition. Differing from the leakage vortex, the corner vortex is composed of multiple vortices developed from the suction surface of the rotor blade. The key mechanism for the generation of the corner vortex is that the rotation of the rotor has different effect on the evolution of positive vortices and negative vortices, which makes the positive vortices dissipates faster than the negative ones, the vortices at the rotor exit therefore bear mainly negative vortices, which induces the fluids to rotate clockwise at the corner and forms the corner vortex.
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Gabriel, Sherlyn, Jack Denny, Steeve Chung Kim Yuen, Genevieve S. Langdon i Reuben A. Govender. "The Effect of Scaling Building Configuration Blast Experiments on Positive Phase Blast Wave Parameters". Applied Sciences 13, nr 10 (12.05.2023): 5956. http://dx.doi.org/10.3390/app13105956.
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Explosions in an urban setting can have a significant negative impact. There is a need to further understand the loading effects caused by the blast’s interaction with structures. In conjunction with this, the effects of scaling and understanding the limitations of laboratory experiments are equally important given the cost incurred for full-scale experiments. The aim of this study was to determine the scaling effects on blast wave parameters found for reduced-scale urban blast scenario laboratory experiments. This paper presents the results of numerical modelling and physical experiments on detonating cuboidal PE-4 charges and measuring the pressure in direct line of sight and at three distinct positions around the corner of a small-scale “building” parallel to the rear wall. Two scales were used, namely 75% and 100%. Inter-scaling between 75% and 100% worked fairly well for positions shielded by the corner of the wall. Additionally, the lab-scale results were compared to similar (but not identical) field trials at an equivalent scale of 250%. The comparison between lab-scale idealised testing and the larger-scale field trials published by Gajewksi and Sielicki in 2020, indicated sensitivity to factors such as detonator positioning, explosive material, charge confinement/mounting, building surface roughness, and environment.
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Ameen, Arman, Haruna Yamasawa i Tomohiro Kobayashi. "Numerical Evaluation of the Flow Field of an Isothermal Dual-Corner Impinging Jet for Building Ventilation". Buildings 12, nr 10 (21.10.2022): 1767. http://dx.doi.org/10.3390/buildings12101767.
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The corner impinging jet ventilation is a new air distribution system for use in office environments. This study reports the mean flow field behavior of dual isothermal corner-placed inlets based on an impinging jet in a square-shaped room with the size of 7.2 m × 7.2 m. A detailed numerical study is carried out to evaluate the influence the different configuration parameters, such as the inlet placement, same side or opposite side, and supply airflow rate, have on the flow field. The results show that the highest velocity peak for all cases is obtained at x = 0.5 m and the lowest at x = 3.5 m. The velocity profiles development remains similar when increasing the flow rate. For the zone evaluation, the results show that Case 1 and 2 (V = 20 L/s) meet the requirement of not exceeding 0.15 m/s during the heating season in the occupied zone according the BBR standard both for same-side and opposite-side configurations. For Case 4, the optimal placement of the inlets is opposite to each other when V = 30 L/s for the BBR requirements. Case 1, 2, 3, 4, 5, and 7 all meet the requirement of not exceeding 0.25 m/s during the cooling season both for the same-side and opposite-side configurations. For Case 8, the optimal placement of the inlets is opposite to each other when V = 50 L/s.
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Malbéqui, Patrice R. "Assessment of sound propagation for the urban air mobility". Journal of the Acoustical Society of America 153, nr 3_supplement (1.03.2023): A325. http://dx.doi.org/10.1121/10.0019015.
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The noise generated by vertical takeoff and landing vehicles (VTOL) operating in urban environnement is a determinant factor for the community acceptance. The ray-tracing method used for predicting road and raylway noise in urban areas can also be applied to the Urban Air Mobility context. In densely populated urban area, the multipath of sound wave occurs due to numerous reflections on the buildings walls. Such a configuration generates both constructive and destructive interferences, given rise to a complex shape of the spectra, that can be difficult to explain. To assess ray codes dedicated to road noise for this kind of configurations, simple test cases such as a corner and a canyon based on image sources are proposed. The prediction is performed in octave bands in the frequency range 63 Hz to 8000 Hz, including acoustical source at high altitudes to account for the VTOL flight. A good agreement is found between the reference solution derived from the image-source and the ray tracing technique. In particular close to the corner a significant increase of about 9 dB can be found. When both the source and the microphone are in the canyon, an inscrease up to 14dB can be found.
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Edwards, Tim, i Jeremy Thompson. "Spar Corner Radius Integrity for the A400M Wing". Applied Mechanics and Materials 3-4 (sierpień 2006): 197–204. http://dx.doi.org/10.4028/www.scientific.net/amm.3-4.197.
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The paper focuses on the structural integrity of the corner radius of the carbon fibre composite, ‘C’-section spar for the Airbus A400M wing. The corner radius is subject to opening moments generated by internal wing box fuel pressures. The low inter-lamina strength of composites makes de-lamination of the corner of prime concern. The paper describes initial development of analytical techniques to calculate the through-thickness tensile stresses and inter-lamina shear stresses developed in a corner radius under applied bending moments and transverse shear forces. A test programme is also described, aimed at the determination of the failure moment of curved laminates under pure bending moments. Using the analytical expressions developed, a through-thickness failure stress is calculated from the failure moments. A variation of the failure stress with specimen thickness is indicated, showing that thicker specimens fail at higher inter-lamina stresses – a characteristic that must be exploited in the design of the spar. Using finite element analysis of the test configuration, in conjunction with virtual crack extension techniques, it is demonstrated that, at the failure load, a constant rate of strain energy release accompanies inter-lamina crack growth in the different test specimens. A critical energy release rate for uncontrolled crack growth is thus established, which is used, in conjunction with further finite element analysis, to predict the failure stress of specimens with different values of thickness and corner radius. It is concluded that this fracture mechanics approach to integrity can be applied to the A400M spar corner and to similar aircraft structures. Recommendations for further testing and correlation with analysis are proposed to strengthen the theoretical basis for such integrity assessments.
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Asavanant, J., i J. M. Vanden-Broeck. "Nonlinear free-surface flows emerging from vessels and flows under a sluice gate". Journal of the Australian Mathematical Society. Series B. Applied Mathematics 38, nr 1 (lipiec 1996): 63–86. http://dx.doi.org/10.1017/s0334270000000473.
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AbstractSteady two-dimensional flows in a domain bounded below by an infinite horizontal wall and above by a semi-infinite horizontal wall, a vertical wall and a free surface are considered. The fluid is assumed to be inviscid and incompressible, and gravity is taken into account. The problem is solved numerically by series truncation. It is shown that for a given length of the vertical wall, there are two families of solutions. One family is characterized by a continuous slope at the separation point and a limiting configuration with a stagnation point and a 120° angle corner at the separation point. The other family is characterized by a stagnation point and a 90° angle corner at the separation point. Flows under a sluice gate with and without a rigid lid approximation upstream are also considered.
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Al-masoodi, Aiman H. H., F. H. Alkhatib, N. Shafiq i MMA Wahab. "The Aerodynamic Performance of Tall Buildings by Utilizing Aerodynamic Modifications - A Review Study". IOP Conference Series: Earth and Environmental Science 1022, nr 1 (1.05.2022): 012046. http://dx.doi.org/10.1088/1755-1315/1022/1/012046.
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Abstract Since the beginning of this century, the trends in urban development have accelerated, as well as the demands for professional designers and planners have also been changed. Therefore, the rapid development in tall buildings has brought many challenges and issues that required systematic research and development. One of the major issues of the tall building to the structural designers is the wind load effect. Thus, the building shape and configuration should be determined based on the considerations of building’s form and function for wind effect. Various approaches are required to maintain the functional needs for reducing the vortex shedding phenomenon of the wind, such as aerodynamic modification techniques, which cause discomfort for the occupants. Aerodynamic modifications are classified into two categories; corner modifications, like rounded corners, recessed corners, chamfered corners, etc, and outer shape modifications, such as taper, set-back, twist of building form, etc. This paper reviews the aerodynamic modification techniques for tall buildings; recession and set-back type are the most effective among these modifications. It concludes that design modifications must be evaluated earlier in the design stage to mitigate the wind load and address serviceability concerns as per recommended, as well as to set the optimal building’s shape.
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Galuscak, Rastislav, Milos Mazanek, Pavel Hazdra i Vaclav Kabourek. "A Dual-Band Reflector Feed in Coaxial Configuration for Satellite Communication [Antenna Applications Corner]". IEEE Antennas and Propagation Magazine 60, nr 5 (październik 2018): 89–94. http://dx.doi.org/10.1109/map.2018.2859168.
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Shashikant, Salunke Abhijeet. "Analysis of Dynamic and Wind Response of Tall Building with Vertical Irregularity". International Journal for Research in Applied Science and Engineering Technology 10, nr 7 (31.07.2022): 173–81. http://dx.doi.org/10.22214/ijraset.2022.44912.
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Abstract: Major structural collapses occur when a building is under the action of Dynamic Loads which includes both Earthquake and Wind loads. In these modern days, most of the structures are involved with architectural importance and it is highly impossible to plan with regular shapes. These irregularities are responsible for structural collapse of buildings under the action of dynamic loads. Hence, extensive research is required for achieving ultimate performance even with a poor configuration. In the present work, “Effect Of Vertical Irregularity In Multi-Storied Buildings Under Dynamic Loads Using Linear Static Analysis”, considering four types of 20- Storied 3-D frames (i.e., a symmetrical elevation configuration throughout its height and three other frames with unsymmetrical vertical configuration starting from tenth floor, placed at corner, at the center and at edge of the plan respectively) it is focused to study their response using Linear Static Analysis.
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Wang, Wei, Zongxiang Li i Hongming Yu. "Goaf Gas Control Improvement by Optimizing the Adjacent Roadway Large-Diameter Boreholes". Advances in Civil Engineering 2021 (21.07.2021): 1–13. http://dx.doi.org/10.1155/2021/1933010.
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This study introduced gas control technology in goaf using adjacent roadway large-diameter (550 mm) boreholes to control gas accumulation in the upper corner of a fully mechanized working face in high-gas coal seams. The gas control process in the upper corner and gas interception in goaf by large-diameter boreholes was analyzed using the CFD model of the gas flow in goaf. The latter considered the control equation of gas flow, the established permeability model of goaf, and the gas emission law in goaf. Using the 2-105 working face of the Tenghui Coal Mine, Shanxi Province, China, as a case study, the distribution patterns of gas concentration and flow field in the goaf for various extraction flow parameters and different positions of boreholes were numerically simulated. The dependences between various locations, drainage flows, and the gas concentration in the upper corner were determined and fitted by engineering equations. The evolution pattern of the spontaneous combustion zone in the goaf under the drainage conditions was also analyzed. The optimal borehole configuration parameters ensuring the extraction flow rate exceeding 3 m·s−1 and the effective gas control in the upper corner of the working face at a distance of 5 m–15 m behind the working face were identified. The engineering practice proved the feasibility of gas control in the goaf using the adjacent roadway large-diameter borehole. The gas concentrations in the return airflow and the upper corner of the working face were kept below 0.65 and 0.8%, respectively, to ensure production safety and improve the gas utilization efficiency.
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Verma, Astha, Rahul Kumar Meena, Hrishikesh Dubey, Ritu Raj i S. Anbukumar. "Wind Effects on Rectangular and Triaxial Symmetrical Tall Building Having Equal Area and Height". Complexity 2022 (20.07.2022): 1–20. http://dx.doi.org/10.1155/2022/4815623.
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The study aims to investigate wind effects on the equal area and the same height building model having the plan cross-sectional shape in the form of regular and irregular shape bulidings. The ratio of modification in the cross-sectional shape is kept same for regular and irregular shaped models because limited studies are available for such type of comparison. The responses of the structure to resist the wind load is increased by applying these modifications in the corner configuration such as corner cut, chamfer, and fillet in the plan shape of the structure. The numerical study is performed using ANSYS CFX and wind incidence angle varies in the range of 0° to 180° at the interval of 15°. The results of velocity and pressure distribution are presented in the form of pressure contours and wind force coefficients for all four-building models which are presented in the form of a graph. The comparison of numerical simulation results on two models are compared with the different international standards and with the experimental results. The regular shape with a corner cut and a “Y”-shaped structure with a fillet corner model performed the best among all models for resisting overall wind force. The results of pressure distribution of all four models are presented in the form of pressure contours for 0° and 90° wind angles.
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Chung, Kung-Ming, Kao-Chun Su i Keh-Chin Chang. "The Effect of Vortex Generators on Shock-Induced Boundary Layer Separation in a Transonic Convex-Corner Flow". Aerospace 8, nr 6 (2.06.2021): 157. http://dx.doi.org/10.3390/aerospace8060157.
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Deflected control surfaces can be used as variable camber control in different flight conditions, and a convex corner resembles a simplified configuration for the upper surface. This experimental study determines the presence of passive vortex generators, VGs (counter-rotating vane type), on shock-induced boundary layer separation for transonic convex-corner flow. The mean surface pressure distributions in the presence of VGs for h/δ = 0.2 and 0.5 are similar to those for no flow control. If h/δ = 1.0 and 1.5, there is an increase in the amplitude of the mean surface pressure upstream of the corner’s apex, which corresponds to greater device drag and less downstream expansion. There is a decrease in peak pressure fluctuations as the value of h/δ increases, because there is a decrease in separation length and the frequency of shock oscillation. The effectiveness of VGs also depends on the freestream Mach number. For M = 0.89, there is an extension in the low-pressure region downstream of a convex corner, because there is greater convection and induced streamwise vorticity. VGs with h/δ ≤ 0.5 are preferred if deflected control surfaces are used to produce lift.
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Ciavarella, M., D. A. Hills i G. Monno. "The influence of rounded edges on indentation by a flat punch". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 212, nr 4 (1.04.1998): 319–27. http://dx.doi.org/10.1243/0954406981521259.
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The contact problem and stress state for indentation by a flat punch with rounded edges is studied. For the contact problem itself analytical solutions are obtained for both surface pressure and interior stress fields. Cases of normal indentation and frictional contact, the latter in both sliding or partial slip conditions, are all treated. The transition from the Hertzian configuration to the contact between a nominally flat pad and contacting flat surface is discussed, and it is found that the strength of the contact decays surprisingly slowly. Regarding the von Mises yield parameter, there is a range of configurations for which the strength is actually higher than the Hertzian one, and the strength decays only when the corner radii are very small. The present solution is therefore a realistic alternative to the classical rigid-flat punch idealization, and has particular application to fretting fatigue tests.
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Shevchenko, M. E., A. B. Gorovoy, V. M. Balashov i S. N. Solovyov. "Features of application of ESPRIT method for different configurations of antenna arrays". Issues of radio electronics, nr 12 (3.02.2021): 30–37. http://dx.doi.org/10.21778/2218-5453-2020-12-30-37.
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The paper discusses the features of the application of the ESPRIT method, which provides direction finding of a variety of radio sources with minimal computational costs, including in real time. To be able to use ESPRIT, antenna arrays are required that have the property of shift invariance, and for practical implementation, antenna arrays are required that allow you to form estimates of the directions of arrival of the largest number of signals that overlap in the spectrum, with a minimum number of antennas and reception channels. The aim of the work is to analyze the influence of the antenna array configuration on the features of ESPRIT application for different antenna array with the same number of antennas. A comparative qualitative analysis of the properties and features compared to the MUSIC method is presented. The algorithms developed by the authors for processing multichannel data received by angle and square antenna arrays are presented. It is shown analytically that when using a corner antenna array, it is necessary to take into account the possible presence of signals from indistinguishable-mirror directions of arrival. With a square antenna array, there are no mirror directions of arrival of different signals, which simplifies the implementation of the algorithm. It is shown analytically and by simulation modeling that the configuration of a square antenna array allows to increase the number of simultaneously tracked signals that overlap in the spectrum, compared to a corner antenna array with the same number of antennas.
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Peng, Chao Yong, Bing Xue i Jian Si Yang. "Application of Digital Coordinate Transformation to a New Posthole Broadband Seismometer". Applied Mechanics and Materials 644-650 (wrzesień 2014): 3434–39. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.3434.
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Most seismological instruments recording ground motion use three sensors oriented north, east, and upward. In this cardinal configuration horizontal and vertical sensors differ in their construction because of the gravitational acceleration affecting the vertical sensor. In order to solve this inconsistence, we have developed a new posthole broadband seismometer with Galperin’s configuration. In this arrangement three identical sensors are also positioned orthogonally to each other but are tilted at the same angle to the vertical axis. We have presented the nominal coordinate transformations used to derive the differential output signals X, Y, Z from the cube-corner-oriented sensor output signals U, V, W, including four types of corrections: orthogonal correction, sensitivity correction, tilt correction and orientation correction. In addition, the hardware circuit for the coordinate transformation matrix is also described in details.
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Ohlemiller, T. J., i J. R. Shields. "The effect of surface coatings on fire growth over composite materials in a corner configuration". Fire Safety Journal 32, nr 2 (marzec 1999): 173–93. http://dx.doi.org/10.1016/s0379-7112(98)00031-9.
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Suo, Lina, Ya-Pei Peng, Cheng-Kai Yao, Shijie Ren, Xinhe Lu i Nan-Kuang Chen. "High Sensitivity Strain Sensors Using Four-Core Fibers through a Corner-Core Excitation". Micromachines 13, nr 3 (11.03.2022): 431. http://dx.doi.org/10.3390/mi13030431.
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A weakly-coupled multicore fiber can generate supermodes when the multi-cores are closer to enter the evanescent power coupling region. The high sensitivity strain sensors using tapered four-core fibers (FCFs) were demonstrated. The fan-in and fan-out couplers were used to carry out light coupling between singlemode fibers and the individual core of the FCFs. A broadband lightsource from superlumminescent diodes (SLDs) was launched into one of the four cores arranged in a rectangular configuration. When the FCF was substantially tapered, the asymmetric supermodes were produced to generate interferences through this corner-core excitation scheme. During tapering, the supermodes were excited based on a tri-core structure initially and then transited to a rectangular quadruple-core structure gradually to reach the sensitivity of 185.18 pm/μԑ under a tapered diameter of 3 μm. The asymmetric evanescent wave distribution due to the corner-core excitation scheme is helpful to increase the optical path difference (OPD) between supermodes for improving the strain sensitivity.
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Laidaoui, Samira, Pascale Aussillous, Mohammed Djermane i Blanche Dalloz-Dubrujeaud. "Discharge flow of granular media from rectangular silos: role of an obstacle and modelling by an orifice at the corner". Mechanics & Industry 21, nr 5 (2020): 516. http://dx.doi.org/10.1051/meca/2020048.
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We present an experimental study on the discharge flow of a granular media from a rectangular silo with a cylindrical obstacle placed above the outlet. As described in the literature, the presence of an obstacle decreases the flow rate, but the characteristic lengths to be chosen in the flow rate law are not known. To predict the flow rate we vary the obstacle diameter and vertical position, the outlet size and the particle diameter. However due to the large number of parameters we find that the characteristic length which controls the flow rate cannot be thoroughly defined. To model the effect of an obstacle on the flow rate we design a new configuration with an orifice at the corner of the silo. We study the two extreme cases (a bottom orifice at the wall and a lateral orifice) and we show that for the corner all the data are in between these two cases.
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Ustinov, Konstantin B. "Certain cases of elastic equilibrium of a composed wedge with an interface crack". Mathematics and Mechanics of Solids 25, nr 12 (14.07.2020): 2199–209. http://dx.doi.org/10.1177/1081286520924070.
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Problems of interface cracks starting from the common corner points of pairs of perfectly glued wedges of different isotropic elastic materials are addressed. It is demonstrated that for a few particular configurations and a restrictive condition imposed on values of elastic constants (corresponding to vanishing of the second Dundurs parameter), the problem of elastic equilibrium may be solved by Khrapkov’s method. These configurations are: (i) the wedges forming a half-plane; (ii) the wedges forming a plane; (iii) one of the wedges being a half-plane. In all cases, the external boundaries are supposed to be free of stresses. By applying Mellin’s transform for all three configurations the problem has been reduced to vector Riemann’s problem, and the matrix coefficient has been factorized for the case of the mentioned restrictive condition. The first configuration, i.e. the problem of an inclined edge crack located along the boundary separating two wedges of different elastic isotropic materials forming a half-plane is considered in more detail. The solution has been obtained for both uniform (corresponding to remote loading) and non-uniform (loading applied at the crack faces) problems. Numerical results are presented and compared with the available results obtained by other authors for particular cases. The obtained solutions appear especially valuable for analysing extreme cases of parameters.
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Peng, Tao, Qiuhong Lin, Bingyan Li, Shuwu Dai, Ani Luo, Qiang Cong i Rongqiang Liu. "Configuration Design and Dynamic Characteristics Analysis of Spacecraft Membrane Sunshield". Polymers 14, nr 3 (4.02.2022): 609. http://dx.doi.org/10.3390/polym14030609.
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To meet the needs of large space telescopes, such as light weight, high folding ratio, and low manufacturing cost, a flexible deployable regular hexagonal membrane sunshield is proposed in this paper. Firstly, the dynamic equation of the membrane plane is established by the micro-element method. Then, the response surface method is used to obtain the mathematical model of the fundamental frequency of the membrane sunshield. The factors influencing this model, such as the corner pulling force, the effective circle radius, and the edge arch height, are analyzed. By combining the formula of the fundamental frequency of the membrane sunshield and the effective area ratio of the sunshield, the multi-objective optimization function of the fundamental frequency of the membrane sunshield is obtained. A scaled-down experimental prototype of the membrane sunshield is built, and the modal test is performed on the thin membrane plane with a circular fixed boundary in the middle. Comparing the experimental results with the finite element simulation results, the mode shape and the fundamental frequency are highly consistent. This proves that the model can be used to solve the fundamental frequency of the membrane sunshield under the same boundary.