Relevant bibliographies by topics / First generation of Spiral FSAT

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'First generation of Spiral FSAT'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "First generation of Spiral FSAT"

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Hong, Zhao Bin, Zhao Jun Yang, Bai Chao Wang, and Xue Cheng Zhang. "Simulation Analysis of Spiral Bevel Gear Tooth Surface Generation Based on VERICUT." Applied Mechanics and Materials 273 (January 2013): 175–79. http://dx.doi.org/10.4028/www.scientific.net/amm.273.175.

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Based on the deeply study on VERICUT, the generating process of spiral bevel gear surface is simulated in this paper. A certain surface generation process of spiral bevel gear is analyzed as an example. First the 3D solid models of gear cutting machine, cutter and gear blank are built. Then the NC program is compiled based on the generating principle of tooth surface. Finally the surface generating movement of spiral bevel gear is realized through selecting control system and importing the NC program. It can be indicated that the simulation analysis of surface generation can optimize the cutti
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Pushkarev, A. I., and YU I. Isakova. "A spiral self-magnetically insulated ion diode." Laser and Particle Beams 30, no. 3 (2012): 427–33. http://dx.doi.org/10.1017/s0263034612000316.

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AbstractThe paper presets the results of a study on a self-magnetically insulated ion diode with an explosive-emission potential electrode. The experiments have been carried out using the TEMP-4M accelerator, operating in a double-pulse mode: the first negative pulse (300–500 ns, 100–150 kV) followed by the second positive pulse (150 ns, 250–300 kV). The ion beam energy density was 0.3–2.5 J/cm2; the beam was composed from carbon ions (80–85%) and protons. We studied several geometries of the diode: planar and focusing strip arrangement, annular and spiral geometries. It was shown that during
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Yang, Jian Jun, Qin Wu, Jun Gong, and Zhi Yuan Rui. "Design of Milling Cutter for Machining Helical Curved Surfaces." Applied Mechanics and Materials 44-47 (December 2010): 748–53. http://dx.doi.org/10.4028/www.scientific.net/amm.44-47.748.

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The article focused on the design of milling cutter for machining helical curved surfaces. First, the characteristics of 3th generation profile in screw compressor were presented; then the equation of touch line between milling cutter and workpiece was constituted based on the envelop principle from milling cutter rolling surface and spiral curved surface; and elementary theories and methods were put forward for designing contour of milling cutter in machining spiral curved surfaces, finally the calculate equation was validated through the machining example by Matlab.
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Duan, Wei, and Heng Chang Feng. "Stress and Modal Analysis of Flat Spiral Spring in Elastic Energy Storage Equipment." Applied Mechanics and Materials 121-126 (October 2011): 1754–58. http://dx.doi.org/10.4028/www.scientific.net/amm.121-126.1754.

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The energy storage technology is playing an important role in improving power grid stability. Aiming to the randomness and intermittent characteristics of wind power generation, the paper proposed a scheme of mechanical elastic storage energy and power generation system based on flat spiral spring. The flat spiral spring, which is the core component in the system, is selected as the research object, and the mechanical model and the finite element model is created. The geometric parameters of spring are determined. The maximum deformation and the stress distribution of spring are obtained. More
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Savchenko, Sergey, Alexander Marchuk, Aleksandr Mosenkov, and Konstantin Grishunin. "A multiwavelength study of spiral structure in galaxies. I. General characteristics in the optical." Monthly Notices of the Royal Astronomical Society 493, no. 1 (2020): 390–409. http://dx.doi.org/10.1093/mnras/staa258.

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ABSTRACT Different spiral generation mechanisms are expected to produce different morphological and kinematic features. In this first paper in a series, we carefully study the parameters of spiral structure in 155 face-on spiral galaxies, selected from the Sloan Digital Sky Survey, in the three gri bands. We use a method for deriving a set of parameters of spiral structure, such as the width of the spiral arms, their fraction to the total galaxy luminosity, and their colour, which have not been properly studied before. Our method is based on an analysis of a set of photometric cuts perpendicul
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Donner, Karl Johan, Axel Brandenburg, and Magnus Thomasson. "Galactic Dynamos and Dynamics." Symposium - International Astronomical Union 157 (1993): 333–37. http://dx.doi.org/10.1017/s0074180900174376.

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We discuss some aspects of the interrelationship between the dynamo problem for galaxies and their dynamics. First, we consider the generation of magnetic fields in the presence of fountain flows and galactic winds. Next, we discuss the distortion of a steady magnetic field by tidal effects and other transient spiral features. Finally, we give an expression for the amplitude of density waves generated by large-scale non-axisymmetric fields.
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Huang, Xiang, and Z. X. Lin. "The Optimal Model of Tool Paths Generation for Pocket Milling." Materials Science Forum 626-627 (August 2009): 201–6. http://dx.doi.org/10.4028/www.scientific.net/msf.626-627.201.

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This paper describes an integrated method to determine optimal cutting parameters for milling pocket based on minimum cutting time. The main constraints entailed in real cutting, such as chatter free, uncut free tool paths, cutter and machine tool limitations, are included into the optimal model. The optimal parameters (depth of cut, width of cut, spindle speed) are inserted into the tool paths generation directly for four kinds of conventional cutting modes (Zig and Zig-Zag parallel cutting mode, inwards and outwards spiral pattern modes). According to the fact that the first cut in every cut
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Javierre, Carlos, L. Ponz, Isabel Clavería, and A. Fernández. "Validation of the Method for Generation of Rheological Model to Characterize Non-Conventional Injection Molding by Means of Spiral Mold." Advanced Materials Research 83-86 (December 2009): 250–60. http://dx.doi.org/10.4028/www.scientific.net/amr.83-86.250.

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This paper presents the results derived from the research, whose first results were presented at AMPT 2005. At this conference, a new method for generation of rheological model to characterize non-conventional injection moulding by means of spiral mould was presented. The continuity of this research line has consisted of the development of several tests for validation of the rheological model obtained with the new method. Viscosity of a PEHD with different percentages of recycled has been tested, by means of several kinds of rheometers, like capillary rheometer and rotational rheometer, and th
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Holwerda, B. W., S. Bianchi, M. Baes, et al. "New HErschel Multi-wavelength Extragalactic Survey of Edge-on Spirals (NHEMESES)." Proceedings of the International Astronomical Union 7, S284 (2011): 128–31. http://dx.doi.org/10.1017/s1743921312008897.

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AbstractEdge-on spiral galaxies offer a unique perspective on the vertical structure of spiral disks, both stars and the iconic dark dustlanes. The thickness of these dustlanes can now be resolved for the first time with Herschel in far-infrared and sub-mm emission. We present NHEMESES, an ongoing project that targets 12 edge-on spiral galaxies with the PACS and SPIRE instruments on Herschel. These vertically resolved observations of edge-on spirals will impact on several current topics.First and foremost, these Herschel observations will settle whether or not there is a phase change in the ve
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Liebmann, Max, Alexander Treffer, Martin Bock, Ulrike Wallrabe, and Ruediger Grunwald. "Ultrashort Vortex Pulses with Controlled Spectral Gouy Rotation." Applied Sciences 10, no. 12 (2020): 4288. http://dx.doi.org/10.3390/app10124288.

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Recently, the spatio-spectral propagation dynamic of ultrashort-pulsed vortex beams was demonstrated by 2D mapping of spectral moments. The rotation of characteristic anomalies, so-called “spectral eyes”, was explained by wavelength-dependent Gouy phase shift. Controlling of this spectral rotation is essential for specific applications, e.g., communication and processing. Here, we report on advanced concepts for spectral rotational control and related first-proof-of-principle experiments. The speed of rotation of spectral eyes during propagation is shown to be essentially determined by angular
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Dissertations / Theses on the topic "First generation of Spiral FSAT"

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Haghighattalab, Armin. "Finite Element Modeling of Spiral Frequency Steerable Acoustic Transducers (FSATs) for guided waves based Structural Health Monitoring of plate-like structures." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016.

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Structural Health Monitoring (SHM) is an emerging area of research associated to improvement of maintainability and the safety of aerospace, civil and mechanical infrastructures by means of monitoring and damage detection. Guided wave structural testing method is an approach for health monitoring of plate-like structures using smart material piezoelectric transducers. Among many kinds of transducers, the ones that have beam steering feature can perform more accurate surface interrogation. A frequency steerable acoustic transducer (FSATs) is capable of beam steering by varying the input frequen
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Conference papers on the topic "First generation of Spiral FSAT"

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Dhanda, Mandeep, Aman Kukreja, and S. S. Pande. "Spiral Tool Path Generation for CNC Machining Using Cloud of Points." In ASME 2020 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/detc2020-22032.

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Abstract This paper presents a new method to generate an adaptive spiral tool path for 3-axis CNC machining of the complex freeform surface directly from its representation in the form of the point cloud. The algorithm first constructs the uniform 2D circular mesh-grid to compute the Z (CL) points by applying the tool inverse offset method (IOM). Adaptive grid refinement is carried out iteratively until the surface form errors converge below the prescribed tolerance limits in both circumferential (forward) and radial (step) directions. Adaptive CL points are further refined to minimize the no.
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Bausman, Anita, Jerry Waterland, and Dan Reid. "New Leakage Requirements for ASME B16.20 and Current Generation Spiral Wound Gaskets." In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93928.

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Abstract The ASME B16.20 Metallic Gaskets for Pipe Flanges standard was extensively revised in 2017 [1]. One of the significant changes is the introduction of maximum permissible leakage rate. This marks a landmark introduction of an actual leakage performance criterion into ASME B16.20, a most welcome advance. A common maximum permissible leakage rate of 0.0137 mg/s-m (7.67E−10 lb/s-in) is specified for all sizes and pressure classes of finished spiral wound gaskets, that is, including the windings and any or no gauge rings for that particular gasket. Test conditions are defined — ambient tem
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Simon, V. "Design and Manufacture of Spiral Bevel Gears With Reduced Transmission Errors." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-66017.

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A method for the determination of the optimal polynomial functions for the conduction of machine-tool setting variations in pinion teeth finishing in order to reduce the transmission errors in spiral bevel gears is presented. Polynomial functions of order up to five are applied to conduct the variation of the cradle radial setting and of the cutting ratio in the process for pinion teeth generation. Two cases were investigated: in the first case the coefficients of the polynomial functions are constant throughout the whole generation process of one pinion tooth-surface, in the second case the c
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Shunmugam, M. S., and B. Subba Rao. "Effect of Setting Errors on Manufactured Surfaces of Spiral Bevel Gear and Pinion." In ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/detc2000/ptg-14397.

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Abstract Settings for generation of spiral bevel gear and pinion are determined in such a manner that the conjugate action in the gear pair is improved during their meshing. Any error in these settings would result in a deviation from the desired surface. Therefore, it is important to identify the critical settings and exercise greater care in their settings. In the present work, simulation of the generation process is carried out and the surfaces obtained are represented with reference to an idealized surface namely the involute spiraloid, established from first principle. The deviations of t
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Yin, Yue, LianShui Guo, Ning Han, Ji Zheng, and Pengpeng Zhang. "A New Strategy of Cavity Cutting Trajectory Generation in High Speed Machining." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-53700.

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High speed machining is widely used in manufacturing. For its high cutting speed, high feeding rate, and high machining accuracy, its requirements for cutting trajectory in high speed machining are so strict that only continuous and smooth trajectories with even cutting loads can lead to high machining efficiency and accuracy. The traditional row or ring machining trajectory fails to meet these requirements. In order to acquire the continuous and smooth machining trajectories, and to avoid load mutation in the machining process, some researchers developed a curvilinear cutting trajectory gener
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Johnson, Graham, Kathy Simmons, and Colin Foord. "Experimental Investigation Into Windage Power Loss From a Shrouded Spiral Bevel Gear." In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27885.

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In some aero-engine applications a spiral bevel gear is mounted in a bearing chamber. The windage power losses (WPL) associated with the gear make a significant contribution to the overall heat generation within the bearing chamber and a potential method of WPL reduction and lubrication/cooling oil management is to shroud the gear. At the University of Nottingham Technology Centre in Gas Turbine Transmission Systems experimental and computational techniques are being applied to enhance understanding of shroud performance and design. This paper presents results from the first stage of the inves
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Eiamsa-ard, Kunnayut, F. W. Liou, Robert G. Landers, and Howie Choset. "Toward Automatic Process Planning of a Multi-Axis Hybrid Laser Aided Manufacturing System: Skeleton-Based Offset Edge Generation." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/dac-48726.

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Even though the machining process has been integrated to the Multi-Axis Laser Aided Manufacturing Process (LAMP) System in order to get good surface finish functional parts [1], the quality of parts produced by the LAMP system is still very much dependent upon the choice of deposition paths. [2] Raster motion paths are replaced by offset spiral-like paths, which are discussed in this paper. Most commercial CAD/CAM packages are feature-based, and their use requires the effort and expertise of the user. The shape has to be decomposed into manufacturing features before the software packages can g
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Zhu, Xiaocheng, Wanlai Lin, and Zhaohui Du. "Experimental and Computational Investigation of the Tip Clearance Flow for an Axial Ventilation Fan." In ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/gt2003-38673.

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The tip leakage flow in an axial ventilation fan with various tip clearances is investigated by experimental measurement and numerical simulation. The characteristic of a ventilation fan is an extreme low-pressure difference, a large tip clearance with a low rotating speed. A three dimensional PDA (Particle Dynamics Analysis) system is used for the measurement of the velocity field in the tip clearance region. The flow field is surveyed across the whole passage at fifteen axial locations (from 100% axial chord in front of the leading edge to 100% axial chord behind the trailing edge), mainly f
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Stanasel, Iulian, Adrian Ghionea, Ionut Ghionea, Petru Ungur, and Oana Stanasel. "The Mathematical Model for the Generation of the Cylindrical Gear With Curved Cycloidal Teeth." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-34501.

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The performed studies regarding the cylindrical gears with curved teeth or in V showed that a uniform distribution of the load on the flanks is hard to realise, generally being necessary later finishing processing or modifying the gear by camber or flanking, which suppose supplementary expenses. On the basis of these mentions and taking into account the advantages of curved bevel gear, the purpose of this paper is to present an original study regarding the mathematical model for generation of a curved cylindrical gear with high performances. The cycloidal gear was chosen after a technical and
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Rákóczi, I., Gy Geró, J. Demeter, and I. Gáti. "INFLUENCE OF GLUCOSE AND INSULIN OF PROSTACYCLIN SYNTHESIS IN CULTURED TR0PH0BLAST CELLS." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643373.

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It is known that placental cells can produce prostacyclin /PGI2/. At present, the physiological role of trophoblast PGI2 production can only be speculative. PGI2 produced by trophoblast may help to prevent the platelet aggregation and thrombosis in spiral arteries and it can also explain the maintance of, and blood flow through, the spiral arteries during endovascular trophoblast invasion in early pregnancy. It has been previously shown that increased glucose concentrations in the incubation fluid can inhibit the formation of PGI2 by rat aortic rings. The aim of present investigation was to st
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