Relevant bibliographies by topics / Multipass operation

Academic literature on the topic 'Multipass operation'

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Published: 4 June 2021
Last updated: 3 February 2022

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Journal articles on the topic "Multipass operation"

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Jabri, Abdelouahhab, Abdellah El Barkany, and Ahmed El Khalfi. "Multipass Turning Operation Process Optimization Using Hybrid Genetic Simulated Annealing Algorithm." Modelling and Simulation in Engineering 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/1940635.

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For years, there has been increasing attention placed on the metal removal processes such as turning and milling operations; researchers from different areas focused on cutting conditions optimization. Cutting conditions optimization is a crucial step in Computer Aided Process Planning (CAPP); it aims to select optimal cutting parameters (such as cutting speed, feed rate, depth of cut, and number of passes) since these parameters affect production cost as well as production deadline. This paper deals with multipass turning operation optimization using a proposed Hybrid Genetic Simulated Annealing Algorithm (HSAGA). The SA-based local search is properly embedded into a GA search mechanism in order to move the GA away from being closed within local optima. The unit production cost is considered in this work as objective function to minimize under different practical and operational constraints. Taguchi method is then used to calibrate the parameters of proposed optimization approach. Finally, different results obtained by various optimization algorithms are compared to the obtained solution and the proposed hybrid evolutionary technique optimization has proved its effectiveness over other algorithms.
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Agapiou, J. S. "The Optimization of Machining Operations Based on a Combined Criterion, Part 2: Multipass Operations." Journal of Engineering for Industry 114, no. 4 (November 1, 1992): 508–13. http://dx.doi.org/10.1115/1.2900705.

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Part 1 of this paper [1] introduced a novel, rational objective function that incorporates both the production cost and total time criteria. In Part 2, the problem of determining the optimum machining conditions for multipass operations is investigated. The optimum number of machining passes is obtained through the dynamic programming technique and the optimum machining conditions for each pass are then determined based on the objective function discussed in Part 1. This approach can be very effectively applied to multistage machining since the optimum arrangement of the different operations can be determined by the dynamic programming method while the optimum cutting conditions for the operations in each machining stage are obtained using the method for single-pass while incorporating the objective function described in Part 1. A multipass turning process is theoretically analyzed and a computational procedure for obtaining the machining parameters is developed. Several examples are presented in order to illustrate the procedure and demonstrate the advantages of the proposed optimization technique for a multipass turning operation.
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Schaeffer, Ronald D., J. C. Sproul, J. O’Connell, C. van Vloten, and Arlan W. Mantz. "Multipass absorption cell designed for high temperature UHV operation." Applied Optics 28, no. 9 (May 1, 1989): 1710. http://dx.doi.org/10.1364/ao.28.001710.

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Ahmad, Nafis, Tomohisa Tanaka, and Yoshio Saito. "Optimization of Multipass Turning Parameters by Genetic Algorithm." Advanced Materials Research 264-265 (June 2011): 1545–50. http://dx.doi.org/10.4028/www.scientific.net/amr.264-265.1545.

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Optimization of cutting parameters is one of the key obstacles for CAD/CAM integration. In this work optimum cutting parameters, the best sequence, number, and type of passes of turning operation are determined by Genetic Algorithm (GA). Proposed optimization strategy ensures that no constraint will be violated at the optimum condition and determines the optimum number and type of passes such as rough, finish and semi-finish passes to complete a multipass turning operation. Here objective function is the unit production cost and constraints are limits of cutting force, power, tool life, stability condition, tool chip interface temperature, surface finish, feed rate to depth of cut ratio and the available rotational speed of spindle of machine tool.
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Moshinskii, A. I. "Analysis of the operation of cocurrent and countercurrent multipass heat exchangers." Theoretical Foundations of Chemical Engineering 40, no. 1 (January 2006): 68–79. http://dx.doi.org/10.1134/s0040579506010106.

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Schulz, M., R. Riedel, A. Willner, S. Düsterer, M. J. Prandolini, J. Feldhaus, B. Faatz, J. Rossbach, M. Drescher, and F. Tavella. "Pulsed operation of a high average power Yb:YAG thin-disk multipass amplifier." Optics Express 20, no. 5 (February 14, 2012): 5038. http://dx.doi.org/10.1364/oe.20.005038.

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Belloufi, Abderrahim, Mekki Assas, and Imane Rezgui. "Intelligent Selection of Machining Parameters in Multipass Turnings Using Firefly Algorithm." Modelling and Simulation in Engineering 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/592627.

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Determination of optimal cutting parameters is one of the most important elements in any process planning of metal parts. In this paper, a new optimization technique, firefly algorithm, is used for determining the machining parameters in a multipass turning operation model. The objective considered is minimization of production cost under a set of machining constraints. The optimization is carried out using firefly algorithm. An application example is presented and solved to illustrate the effectiveness of the presented algorithm.
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Sarkar, S., K. Ghosh, S. Mitra, and B. Bhattacharyya. "An Integrated Approach to Optimization of WEDM Combining Single-Pass and Multipass Cutting Operation." Materials and Manufacturing Processes 25, no. 8 (July 30, 2010): 799–807. http://dx.doi.org/10.1080/10426910903575848.

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Giuliani, G., S. Loreti, G. Salvetti, and E. Palange. "Multipass grating interferometer as output coupler for tunable, single-mode operation of large-bandwidth lasers." Optics Letters 10, no. 12 (December 1, 1985): 600. http://dx.doi.org/10.1364/ol.10.000600.

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Heinz, P., A. Seilmeier, and A. Piskarskas. "Picosecond Nd:YLF laser-multipass amplifier source pumped by pulsed diodes for the operation of powrful OPOs." Optics Communications 136, no. 5-6 (April 1997): 433–36. http://dx.doi.org/10.1016/s0030-4018(96)00733-x.

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Dissertations / Theses on the topic "Multipass operation"

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Zhong, Yu Mechanical &amp Manufacturing Engineering Faculty of Engineering UNSW. "A study of the cutting performance in multipass abrasive waterjet machining of alumina ceramics with controlled nozzle oscillation." Publisher:University of New South Wales. Mechanical & Manufacturing Engineering, 2008. http://handle.unsw.edu.au/1959.4/41216.

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An experimental investigation has been undertaken to study the depth of cut in multipass abrasive waterjet (AWJ) cutting of an 87% alumina ceramic with controlled nozzle oscillation. The experimental data have been statistically analysed to study the trends of the depth of cut with respect to the process parameters. It has been found that multipass cutting with controlled nozzle oscillation can significantly increase the depth of cut. Within the same cutting time and using the same cutting parameters other than the jet traverse speed, it has been found that multipass cutting with nozzle oscillation can increase the depth of cut by an average of 74.6% as compared to single pass cutting without nozzle oscillation. Furthermore, a multipass cutting with higher nozzle traverse speeds can achieve a larger depth of cut than a single pass cutting at a low traverse speed within the same cutting time. A recommendation has been made for the selection of appropriate process parameters for multipass cutting with nozzle oscillation. In order to estimate the depth of cut on a mathematical basis, predictive models for the depth of cut in multipass cutting with and without nozzle oscillation have been developed using a dimensional analysis technique. The model development starts with the models for single pass cutting which are then extended to multipass cutting where considerations are given to the change of the actual standoff distance after each pass and the variation of kerf width. These predictive models has been numerically studied for their plausibility by assessing their predicted trends with respect to the various process variables, and verified qualitatively and quantitatively based on the experimental data. The model assessment reveals that the developed models correlate very well with the experimental results and can give adequate predictions of this cutting performance measure in process planning.
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Guéguen, Arnaud, and David Auvray. "Multipath Mitigation on an Operational Telemetry Link." International Foundation for Telemetering, 2011. http://hdl.handle.net/10150/595646.

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ITC/USA 2011 Conference Proceedings / The Forty-Seventh Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2011 / Bally's Las Vegas, Las Vegas, Nevada
Transmitter mobility and multipath propagation make the telemetry channel both time and frequency selective, which results in telemetry link errors, sometimes in crucial flight phases. Only part of these impairments are compensated by various diversity techniques, but a fast converging adaptive channel equalization is probably the best suited and most cost effective solution. This paper first presents an analysis of mobile multipath propagation in telemetry based on recorded operational signals, both at the transmitter and at the receiver sides. Then it provides performance evaluation of a novel blind equalizer, assessed by offline processing of the recorded signals. The paper focuses on typical environments at a flight test centre, which exhibit critical multipath channel characteristics, namely during parking, taxiway and flight. The channel analysis exploits the recorded signals as well as the time frequency response of the novel equalizer filter. Performance evaluation shows that the equalizer outperforms state of the art Constant Modulus Algorithm (CMA). In particular, it is shown to significantly increase the telemetry link availability even in severe conditions, sometimes from nearly 0% to almost 100%, whereas the CMA fails to improve the signal quality as soon as the channel varies in time.
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Jiang, Mo. "Pharmaceutical crystallization design using micromixers, multiphase flow, and controlled dynamic operations." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98708.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemical Engineering, 2015.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 198-214).
Crystallization is a key unit operation in the pharmaceutical industry. Control of crystallization processes can be challenging when undesirable phenomena such as particle attrition and breakage occur. This thesis describes the controlled crystallization of pharmaceuticals and amino acids for more efficient manufacturing processes and better efficacy of products. Crystallization equipment is designed so that (1) the undesirable phenomena do not occur at all, and/or (2) the phenomena that do occur are carefully controlled. One key strategy is to exploit dual-impinging jets and multiphase flow to decouple nucleation and growth so that they can be individually controlled. Various configurations of micromixers were designed to provide controlled nucleation. Based on the dual-impinging-jet (DIJ) configuration, a physical explanation was provided for the discovery that a cooling micromixer can generate small crystals of uniform size and shape. An alternative design replaces the micromixing with the application of ultrasonication to decouple nucleation and flow rates. Based on these nucleation methods, a novel continuous crystallizer is designed where the slurry flow is combined with an air flow to induce a multiphase hydrodynamic instability that spontaneously generates slugs where the crystals continue to grow. These slugs are well-mixed without having the mixing blades in traditional crystallizer designs that induce undesirable uncontrolled crystallization phenomena. Another key strategy is to increase the degrees of freedom in the dynamic operation of the crystallizers. In the slug-flow continuous crystallizer, extra degrees of freedom for control of the crystal growth are created by spatially varying the temperature profile along the tube. In a semi-continuous crystallizer configuration, continuous seeding using a DIJ mixer is combined with growth rate control in a stirred tank to experimentally demonstrate the manufacture of uniform-sized crystals. In addition, temperature-cycling experiments are designed in batch crystallizers to substantially change crystal shape with only a small number of cycles. Experimental validation confirms that the proposed crystallizer designs reduce production time and equipment cost by orders of magnitude while suppressing secondary nucleation, attrition, and aggregation/agglomeration-dominant but undesired phenomena that worsen the ability to control the properties of crystals produced by most existing crystallizer designs.
by Mo Jiang.
Ph. D.
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Bougas, Vassilis. "The development of a crystal modulator using a multipath reflection technique." Thesis, London Metropolitan University, 1993. http://repository.londonmet.ac.uk/3301/.

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An AOP lumped crystal transverse modulator has been developed, based upon a novel crystal cut, which operates at much lower driving voltages than presently available commercial state of the art modulators. With the latter, the modulation bandwidth is limited by the requirement for driving voltages in the range of 115V to 250V, which are difficult and expensive to produce using existing semiconductor technology. The reduction in driving voltage leads to an increased modulation bandwidth; low voltage wideband drivers are readily available. The modulator's novelty lies in a composite crystal scheme which allows a light beam to be reflected back and forth many times. The voltage requirement is reduced by a factor dependent on the number of times the light beam passes through the crystals. This modulator does not require a half wave plate and can therefore operate at any optical wavelength as is also the case with some of the existing designs. But in addition, unlike the existing designs, this novel modulator allows for multicolour multibeam operation. Using four AOP crystals (15.0mm length, 16.5mm width and 2.5mm thickness) a half wave voltage of 65V has been achieved after seven passes. The extinction ratios obtained were in the range of 50:1 to 100:1. A theory developed and supported by experimental results shows that the extinction ratio depends upon the angle of propagation of the light bean through the crystals. Improvements in this area are suggested. Finally, a technique for extending the operational bandwidth of any modulator is presented. The bandwidth of the multipath modulator was 70MHz.
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Aliaga, Rivera Cristhian Neil. "An unsteady multiphase approach to in-flight icing /." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112552.

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Ice accretion is a purely unsteady phenomenon that is presently approximated by most icing codes using quasi-steady modeling. The accuracy of ice prediction is thus directly related to the arbitrarily prescribed time span during which the impact of ice growth on both flow and droplets is neglected. The objective of this work is to remove this limitation by implementing a cost-effective unsteady approach. This is done by fully coupling, in time, a diphasic flow (interacting air and droplet particles) with the ice accretion model. The two-phase flow is solved using the Navier-Stokes and Eulerian droplet equations with dual-time stepping in order to improve computational time. The ice shape is either obtained from the conservation of mass and energy within a thin film layer for glaze and mixed icing conditions, or from a mass balance between water droplets impingement and mass flux of ice for rime icing conditions. The iced surface being constantly displaced in time, Arbitrary Lagrangian-Eulerian terms are added to the governing equations to account for mesh movement. Moreover, surface smoothing techniques are developed to prevent degradation of the iced-surface geometric discretization. For rime ice, the numerical results clearly show that the new full unsteady modeling improves the accuracy of ice prediction, compared to the quasi-steady approach, while in addition ensuring time span independence. The applicability of the unsteady icing model for predicting glaze ice accretion is also demonstrated by coupling the diphasic model to the Shallow Water Icing Model. A more rigorous analysis reveals that this model requires the implementation of local surface roughness and that previous quasi-steady validations cannot be carried out using a small number of shots, therefore the need for unsteady simulation.
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Tazi, Hemida Mohamed. "Regularite l**(p) maximale pour une classe d'operateurs a caracteristiques multiples." Rennes 1, 1988. http://www.theses.fr/1988REN10046.

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Il s'agit de regarder dans le 1er sujet la regularite l**(p) maximale pour une classe d'operateurs a characteristiques multiples. Dans le 2eme sujet, nous etudions l'hypoellipticite maximale d'un systeme d'operateurs pseudo-differentiels
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Skirpan, Zachary. "Multiphase CFD benchmark of experimental critical heat flux data at PWR operating conditions." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/127300.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Nuclear Science and Engineering, May, 2020
Cataloged from the official PDF of thesis.
Includes bibliographical references (pages 85-89).
Critical Heat Flux (CHF) in flow boiling represents the fundamental upper limit for thermal hydraulic performance of PWR fuel. Currently, the nuclear industry relies on expensive, prototypical experiments using electrically heated, full-height rod assemblies to determine the limit of the boiling crisis. The development of next-generation Multiphase Computational Fluid Dynamics (M-CFD) approaches for the prediction of CHF seeks to represent the detailed physics of the boiling process up to its critical condition, rather than estimating it from ad-hoc thresholds. In this work we evaluate the advancement in M-CFD boiling attained by the Consortium for Advanced Simulation of Light water reactors (CASL). The CASL approach builds off an industry-lab-university collaboration with individual validation of interfacial momentum closures and wall boiling models.
The M-CFD simulations were implemented in the commercially available STAR-CCM+ software, and benchmarked against experimental observations of CHF collected at the University of Wisconsin by Duarte. In this work, 15 M-CFD simulations were completed. Boiling curves were generated for each test case. The modelled boiling characteristics were then compared to expected physical parameters to determine model accuracy. Structural spacers are the main driver of vapor accumulations leading to the breakdown of boiling heat transfer at CHF. Interestingly, M-CFD solutions indicate that the Departure from Nucleate Boiling (DNB) first occurs in areas not measured by the experimental thermal couples used to detect CHF, possibly resulting in a late experimental detection. Additionally, sensitivity studies are conducted for relevant model terms to understand their impact on CHF.
Leveraging the results from this sensitivity study, it is suggested that improved predictions could 1) increase the turbulent dispersion at the wall to account for turbulence under-prediction and 2) increase the minimum bubble size limiter to reflect physically observed coalesced bubble sizes after departure. For future work, higher spatial resolution measurements for detecting DNB are suggested for better experimental CHF predictions. A fully mechanistic approach for modeling the heat flux partitioning and subsequent wall boiling in M-CFD is also needed to more effectively simulate the proper heat transfer mechanisms and boiling physics before CHF. It is the hope that through this work and further M-CFD heat transfer investigations that similar methods may be validated for CHF detection and streamline the fuel design process in the nuclear industry.
by Zachary Skirpan.
S.M.
S.M. Massachusetts Institute of Technology, Department of Nuclear Science and Engineering
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Zhu, Zhen. "CHARACTERIZATION OF GLOBAL POSITIONING SYSTEM EARTH SURFACE MULTIPATH AND CROSS CORRELATION FOR AIRCRAFT PRECISION APPROACH OPERATIONS USING SOFTWARE RADIO TECHNOLOGY." Ohio University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1156276678.

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Bello, Oladele O. [Verfasser]. "Modelling particle transport in gas oil sand multiphase flows and its applications to production operations / submitted by Oladele O. Bello." [Clausthal-Zellerfeld] : [Univ.-Bibliothek], 2008. http://d-nb.info/990729931/34.

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Alwan, Abdulmalik Abdullah [Verfasser], and Wilhelm [Akademischer Betreuer] Dominik. "Numerical Reservoir Simulations of Multiphase Pump Operations on the Rütenbrock Sour Gas Field, Northwest-Germany / Abdulmalik Abdullah Alwan. Betreuer: Wilhelm Dominik." Berlin : Universitätsbibliothek der Technischen Universität Berlin, 2011. http://d-nb.info/1014827817/34.

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Books on the topic "Multipass operation"

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), Society of Petroleum Engineers (U S. Offshore multiphase production operations: Multiphase flow theory and flow assurance. 2nd ed. (Richardson, Tex: Society of Petroleum Engineers, 2004.

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Offshore multiphase production operations: Multiphase flow theory and flow assurance. 2nd ed. (Richardson, Tex: Society of Petroleum Engineers, 2004.

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Staněk, Vladimír. Fixed bed operations: Flow distribution and efficiency. Edited by Sharp David. New York: Ellis Horwood, 1994.

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Dasilva, Carl A. An LMS array receiver operating in a multipath environment. Ottawa: National Library of Canada, 1993.

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Trade, Canada Dept of Foreign Affairs and International. Telecommunications (INTELSAT) : amendment of the operating agreement relating to the International Telecommunications Satellite Organization "INTELSAT" to implement multiple signatory arrangements, Washington, April 16, 1996, acceptance by Canada April 16, 1996, in force for Canada September 11, 1996 =: Télécommunications (INTELSAT) : amendement à l'accord d'exploitation relatif à l'Organisation internationale des télécommunications par satellites "INTELSAT", pour mettre en oeuvre le regime à signataires multiples, Washington, le 16 avril 1996, acceptation du Canada le 16 avril 1996, en vigueur pour le Canada le 11 septembre 1996. Ottawa, Ont: Queen's Printer = Imprimeur de la Reine, 1998.

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Ossowski, Rolando, and Håvard Halland. The Economics of Sovereign Wealth Funds. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198803720.003.0018.

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Many countries have set up sovereign wealth funds (SWFs) as vehicles for public saving and wealth management. The majority are in resource-exporting countries; frequently stated objectives are macroeconomic and fiscal stabilization, intertemporal transfer of wealth, and national development. Some resource funds hold assets equivalent to several multiples of GDP, but many funds are relatively small. The evidence shows that the design and operation of an SWF can help or encumber economic management and wealth preservation. Poorly designed stabilization and saving funds without operational flexibility can be costly and interfere with wealth objectives. Many SWFs conduct domestic operations; this creates opportunities but also potentially serious risks to public wealth that must be addressed. Strong SWF governance and transparency are key to achieving sustainable performance and preventing political capture and misuse of public resources. While a number of funds have made progress in these areas, in others much remains to be done.
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Operation Freak. McGill-Queen's University Press, 2012.

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Fey, Fitzgerald, Friel & Phillips Lappan - conflated. Connected Mathematics Prime Time Factors and Multiples Teacher's Guide (Numbers and Operations). Pearson Prentice Hall, 2004.

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Book chapters on the topic "Multipass operation"

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Gordon, Charles M., and Walter Leitner. "Homogeneous Catalysis in Supercritical Solvents as a Special Unit Operation." In Multiphase Homogeneous Catalysis, 644–58. Weinheim, Germany: Wiley-VCH Verlag GmbH, 2008. http://dx.doi.org/10.1002/9783527619597.ch6c.

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Zohdi, Tarek I. "Elementary Notation and Mathematical Operations." In Electromagnetic Properties of Multiphase Dielectrics, 5–11. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-28427-4_2.

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Mao, Zai-Sha, and Chao Yang. "Homogeneous Catalysis in the Aqueous Phase as a Special Unit Operation." In Multiphase Homogeneous Catalysis, 96–147. Weinheim, Germany: Wiley-VCH Verlag GmbH, 2008. http://dx.doi.org/10.1002/9783527619597.ch2c.

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Mecking, Stefan. "Homogeneous Catalysis with Soluble Polymer-Bound Catalysts as a Unit Operation." In Multiphase Homogeneous Catalysis, 765–75. Weinheim, Germany: Wiley-VCH Verlag GmbH, 2008. http://dx.doi.org/10.1002/9783527619597.ch7c.

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Iguchi, Manabu, and Olusegun J. Ilegbusi. "Modeling Gas–Liquid Flow in Metallurgical Operations." In Modeling Multiphase Materials Processes, 293–324. New York, NY: Springer New York, 2010. http://dx.doi.org/10.1007/978-1-4419-7479-2_9.

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Eschauzier, Rudy G. H., and Johan H. Huijsing. "Multipath Compensation Techniques." In Frequency Compensation Techniques for Low-Power Operational Amplifiers, 143–73. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4757-2375-5_6.

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Al-Adsani, Ahmad S., and Omid Beik. "Operation and Characterization of Multiphase HPM Generator in SHEV Powertrain." In Multiphase Hybrid Electric Machines, 171–206. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-80435-0_6.

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Rodman, Leiba. "Vandermonde Operators and Common Multiples." In An Introduction to Operator Polynomials, 93–129. Basel: Birkhäuser Basel, 1989. http://dx.doi.org/10.1007/978-3-0348-9152-3_4.

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Rodman, Leiba. "Common Divisors and Common Multiples." In An Introduction to Operator Polynomials, 297–316. Basel: Birkhäuser Basel, 1989. http://dx.doi.org/10.1007/978-3-0348-9152-3_9.

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Zheng, Lee Yi, and S. G. Ponnambalam. "A Hybrid GA-AIS Heuristic for Optimization of Multipass Turning Operations." In Intelligent Robotics and Applications, 599–611. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-16587-0_55.

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Conference papers on the topic "Multipass operation"

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Peshev, Zahari Y., Zdravka I. Aneva, Atanaska D. Deleva, Elena P. Vidolova-Angelova, and Dimitar A. Angelov. "Enhanced operation of tunable dye and Ti:sapphire lasers using a multipass selective reflector." In 10th International School on Quantum Electronics: Lasers--Physics and Applications, edited by Peter A. Atanasov and Dimitar V. Stoyanov. SPIE, 1999. http://dx.doi.org/10.1117/12.347597.

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Francis, J. A., A. F. Mark, M. Turski, S. K. Bate, M. Hofmann, and P. J. Withers. "A Comparison of Residual Stresses in Single-Pass and Multipass SA508 Steel Welds." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25705.

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The safe operation of a power plant is contingent on the integrity of its welded joints. In turn, the performance of these welded joints is strongly influenced by the residual stresses that remain after fabrication and, where applicable, post-weld heat treatment operations. It is thus critical that careful consideration is given to the influence of weld residual stresses on plant integrity at the design stage, as well as during subsequent service. Since it is generally difficult to measure weld residual stresses in thick-walled components, numerical models are employed to make predictions. Such models, however, will be limited by our understanding of material behaviour, particularly in the case of multipass welds, which involve several complex thermo-mechanical cycles. Here, we report on neutron diffraction measurements, which enable the residual stresses for a single weld bead deposited on to a 20 mm thick SA508 steel plate to be compared with those in an 8-pass groove weld. The same low-carbon (SD3) filler metal was used in the manufacture of both types of specimen. Interestingly, the residual stress distributions for each type of specimen were found to be very similar. This suggests that cyclic hardening effects did not play a decisive role in determining the final residual stress distribution within the multipass weld.
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Lhachemi, Dounia, Vincent Robin, Philippe Gilles, Philippe Mourge, and Mehdi Zemmouri. "3D Simulation of a Peripheral Adapter J-Groove Attachment Weld in a Vessel Head." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25703.

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In Pressurized Water Reactors, most of components have large thicknesses and their manufacturing processes often require multipass welding. In spite of the stiffness of these components, the distortion issue may be important for operational requirements (e.g. misalignment) or controllability reasons (Non Destructive Examinations have to be feasible). These requirements may be difficult to meet by adjusting welding processes. Indeed because of the complexity of mechanisms involved during a welding operation and the high number of influencing parameters, this process is still essentially based on the experience of the welder. Furthermore the experimental estimation of the stress and distortion level in the component remains a difficult task that is subject to errors even if techniques are currently improved to become more accurate. That is the reason why AREVA NP has put many efforts into developing welding numerical simulations, in order to have a better understanding of the involved physical phenomena and also to predict the residual state allowing a qualification of the manufacturing processes in the very early phase of the welded components design. Within the framework of a R&D program whose main objective was to improve tools for numerical simulation of industrial cases of welding, AREVA NP has decided to validate new methodologies based on 3D computation by comparison with measurements. For this validation task the chosen test case concerns a peripheral adapter J-groove attachment weld on a vessel head. For such an application, operations of post-joining straightening have to be limited, if not prohibited, because of their cost or the impossibility to use them in front of a steel giant. The control of distortions during welding operations constitutes an important stake for which simulation can be of great help. Regarding distortions issues, an accurate metal deposit sequence modeling is mandatory, especially for multipass welding on such a complex geometry. The aim of this paper is to present, through a peripheral adapter J-groove attachment weld mock-up, the capabilities AREVA NP has in order to predict, in an efficient way the consequences of complex welding operations requiring 3D transient numerical simulations.
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Bărglăzan, M., C. Velescu, T. Miloş, A. Manea, E. Dobândă, and C. Stroiţă. "Hydrodynamic transmission operating with two-phase flow." In MULTIPHASE FLOW 2007. Southampton, UK: WIT Press, 2007. http://dx.doi.org/10.2495/mpf070361.

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de Salis, J., Ch de Marolles, J. Falcimaigne, and P. Durando. "Multiphase Pumping - Operation & Control." In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 1996. http://dx.doi.org/10.2118/36591-ms.

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6

Perry, Robert A., Jeremy M. Pitts, Andrei M. Strikovski, and Utkarsh Sinha. "Sustaining Oil and Gas Fields by Using Multiphase Gas Compression to Increase Production and Reserves, and Lower Operating Costs and Environmental Emissions Footprint." In Offshore Technology Conference. OTC, 2021. http://dx.doi.org/10.4043/31072-ms.

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Abstract A multiphase compressor has been developed that provides: compression ratios up to 40:1, the ability to handle multiphase and slugging flow, and a very broad and flexible operating range allowing it to be positioned near the wellhead. Currently the product is targeted at onshore unconventional fields, and field data have been collected on such fields. For deployment to onshore unconventional fields the multiphase compressor has been packaged within a system so that it is easily transportable and fully self-contained, requiring no external power source or utilities. Also, minimal effort is required to tie in at the wellpad (just process connections in and out), no downhole intervention is needed, and typically no site preparations are required, which allow it to be easily relocatable with minimal sunk investment cost. Onshore applications include: Artificial lift from surface to increase production and reserves, and reduce operating costs – applicable to both oil wells with moderate quantities of gas present, and gas wells suffering from liquid loading. Field data show production enhancement of up to 300% versus alternative forms of artificial lift. ‘Frac hit’ recovery to restore parent well production more quickly (by accelerated recovery of preload or ‘frac hit’ fluids from parent wells) – applicable to both oil and gas wells. Field data show accelerated fluid removal versus alternative forms of artificial lift and reservoir studies indicate around an order of magnitude faster recovery of fluids. Lower methane and CO2 emissions and operating costs from field operations – operator intensive flowbacks to open top tanks to kick wells off can instead be achieved with the multiphase compressor, which also avoids the methane emissions to the environment associated with open top tank flowbacks or CO2 emissions from flaring. Lower methane and CO2 emission field development options – by enabling multiphase gathering to centralized facilities, the emissions associated with poor pad separation and the associated fugitive emissions from on-site storage and movement of volatile liquids can be eliminated, and at the same time eliminating operating costs associated with intensive distributed operations such as road tanker export of oil from wellpads. Additionally, abandonment of late life conventional oil and gas reservoirs and wells can be deferred by avoiding slugging well flows for longer – adding both production and reserves, and removing the operating cost associated with kicking off wells. For land conventional well applications the same multiphase compressor and package can be deployed as for unconventional fields – and the system packaging can be easily adjusted to deploy to offshore platforms. The multiphase compressor has also been redesigned for subsea, and uses the same principles of operation to provide unique benefits for subsea applications: particularly for late life gas wells to add more production and reserves than would be possible from existing subsea multiphase boosting. Operators will be able to deliver more production and reserves from their existing assets, reduce operating costs, and lower environmental emissions from their production operations.
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Hu, Y. Thomas, Travis Larsen, and Vladimir Martysevich. "Study of Proppant Suspending Using a Multipass Slot Flow Apparatus." In SPE Production and Operations Symposium. Society of Petroleum Engineers, 2015. http://dx.doi.org/10.2118/173629-ms.

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HOUCHENS, BRENT C., SARAH N. SCOTT, VICTOR E. BRUNINI, ELIZABETH M. C. JONES, MICHAEL M. MONTOYA, WENDY FLORES-BRITO, and KATHRYN N. G. HOFFMEISTER. "SWELLING DURING PYROLYSIS OF FIBRE–RESIN COMPOSITES WHEN HEATED ABOVE NORMAL OPERATING TEMPERATURES." In MULTIPHASE FLOW 2019. Southampton UK: WIT Press, 2019. http://dx.doi.org/10.2495/mpf190171.

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9

Pussegoda, L. N., D. Begg, and R. Lazor. "Development of a Multi-Pass Weld Transverse Cracking Test." In 2008 7th International Pipeline Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ipc2008-64559.

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Transverse weld metal cracking has been occasionally observed in girth welds on large diameter thick wall pipelines that utilize high strength steels. The cracks are typically in the last one or two layers of the weld, and are not necessarily surface-breaking cracks. These cracks are a serious concern as they are parallel to the pipe axis, an orientation that is perpendicular to the hoop stress due to pipeline operation. Weldability tests have been developed or modified in recent years that were intended to specifically examine the tendency for cracking in multipass welds. Test methods are somewhat similar in that a multilayer full-thickness weld is deposited in a restrained (or self-restrained) weld joint, followed by examination to determine the occurrence of cracking after a specified delay period. The primary objective of this study has been to develop a test method that can then be used to compare the incidence of cracking to hydrogen-induced cracking prediction methods (for example delay time), also allowing one to develop welding conditions that would avoid cracking of field welds during pipeline construction. This could be achieved in two ways; a) determining delayed cracking time, and b) assessing the effects of pre-heat and interpass temperature. The test has been successful in producing transverse cracks in the top layers of the fill passes, similar to the cracking that has been observed on thick weldments in high strength steels. The test has been instrumented to assess the restraint level and also to attempt to detect cracking. The cracking has also been detected by UT and subsequent sectioning.
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Aspelund, A., O. Midttveit, and A. Richards. "Challenges in Downhole Multiphase Measurements." In European Production Operations Conference and Exhibition. Society of Petroleum Engineers, 1996. http://dx.doi.org/10.2118/35559-ms.

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Reports on the topic "Multipass operation"

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Ford, A., C. Raiciu, M. Handley, and O. Bonaventure. TCP Extensions for Multipath Operation with Multiple Addresses. RFC Editor, January 2013. http://dx.doi.org/10.17487/rfc6824.

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Ford, A., C. Raiciu, M. Handley, O. Bonaventure, and C. Paasch. TCP Extensions for Multipath Operation with Multiple Addresses. RFC Editor, March 2020. http://dx.doi.org/10.17487/rfc8684.

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Bonaventure, O., C. Paasch, and G. Detal. Use Cases and Operational Experience with Multipath TCP. RFC Editor, January 2017. http://dx.doi.org/10.17487/rfc8041.

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Bagnulo, M. Threat Analysis for TCP Extensions for Multipath Operation with Multiple Addresses. RFC Editor, March 2011. http://dx.doi.org/10.17487/rfc6181.

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