Relevant bibliographies by topics / Work Holding Device

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Work Holding Device'

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

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Journal articles on the topic "Work Holding Device"

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Okoli, John U., and Tamuno K. Jinyemiema. "Versatile Work Holding Device for Hole Drilling in Small-Scale Production Workshops." Advanced Materials Research 18-19 (June 2007): 481–86. http://dx.doi.org/10.4028/www.scientific.net/amr.18-19.481.

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This devise addresses the inadequacies of providing a quick means of holding jobs of irregular shapes such as are encountered in small scale fabrication workshops. The conventional bench vise often does not provide the adequate grip for such shapes so that attachments in the form of V blocks are usually provided to enhance the grip before drilling operations are carried out. This versatile work holding device enables fabricators to perform drilling and other production operations on a work piece. This device produced from mild steel plates uses the toggle principle to provide rapid grip. Comparative tests on time span in the use of this device and the bench vice for job set up, production operation and then disassembly showed that time is gained with use of the device.
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Hemanth, M., P. R. Dheeraj, S. Hamritha, B. Rajesh, and S. R. Vamshi Krishna. "Design of work holding device for machining wheel hubs." Journal of Physics: Conference Series 1706 (December 2020): 012204. http://dx.doi.org/10.1088/1742-6596/1706/1/012204.

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Soloviev, Stanislav, Ahmed Elasser, Sarah Katz, Steve Arthur, Zach Stum, and Liang Chun Yu. "Optimization of Holding Current in 4H-SiC Thyristors." Materials Science Forum 740-742 (January 2013): 994–97. http://dx.doi.org/10.4028/www.scientific.net/msf.740-742.994.

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Two designs (A and B) of 4H-SiC thyristors for pulse power applications were implemented and characterized in this work. Both designs have the same layout and epi-layer stack except for the anode layers: thyristors with design A (baseline) had a thin (~0.5 um) anode while devices with design B (optimized) consisted of a heavily doped cap layer (~0.5 um, ~1019/cc) and ~1.5 um p-type layer with lower doping (~1018/cc). All devices were fabricated in 4” 4H-SiC subSuperscript textstrates (three wafers per each design) and were fully characterized at the wafer level including measurements of forward voltage, blocking voltage, leakage current, and holding current. It was shown that the mean value of the holding current in the thyristors with thin anode was significantly higher (0.7A) than that of the thyristors with thick anode (0.1A), while other parameters had practically the same values. The open circuit voltage decay (OCVD) method was used for measurements of the minority carrier lifetime in order to correlate it with the holding current. Impact of material properties and device design parameters on the holding current is discussed as well.
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Mahind, SanketB, RuturajS Surve, SiddheshwarP Jadhav, ShubhamS Waykar, and Ujwal Gawai. "DESIGN AND ANALYSIS OF WORK HOLDING DEVICE FOR MILLING OPERATION ON FRONT AXLE BEAM (HCV)." International Journal of Advanced Research 4, no. 5 (2016): 953–60. http://dx.doi.org/10.21474/ijar01/533.

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Lengerov, Angel. "TECHNOLOGICAL OPTIMIZATION OF POSITIONING PRISMATIC-BODY DETAILS IN HOLDING DEVICES." ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 3 (June 16, 2021): 195–97. http://dx.doi.org/10.17770/etr2021vol3.6523.

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The aim of the present work is to propose and substantiate a scheme of a device for positioning prismatic-body details on two holes with parallel axes and a plane, perpendicular to them. This will help to achieve high accuracy of linear and angular orientation of the workpiece. Thus the requirements for the accuracy of the center-to-center distance of the base holes will be reduced and the process of assembling the workpiece to the grip pawls will be simplified.
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Makarov, Alexey M., Oleg V. Mushkin, and Maksim A. Lapikov. "Use of additive technologies to increase effectiveness of design and use of a vacuum gripping devices for flexible containers." MATEC Web of Conferences 224 (2018): 01082. http://dx.doi.org/10.1051/matecconf/201822401082.

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In an effort to increase efficiency of the process of handling of an air-penetrating flexible container during its’ filling with free-flowing materials a devise has been designed for automatic gripping, opening, holding and sealing of flexible container, containing vacuum gripping devise, pneumatic drive for its’ transfer and a control system based on programmable logical controller. Vacuum gripping device can be produced using the method of additive technologies. It has a modular structure, while each module contains random or structured vacuum chambers located on work surface area, connected to a system of internally branched channels with the source of vacuum. Large number of small vacuum chambers in place allows to minimize leakage of air though pores and openings on the surface of the mouth of weaved flexible container, which increases reliability of holding and reduces energy consumption during the process of handling air-penetrating packaging during its’ filling.
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Schaposnik, Laura P., and James Unwin. "The phone walkers: a study of human dependence on inactive mobile devices." Behaviour 155, no. 5 (2018): 389–414. http://dx.doi.org/10.1163/1568539x-00003496.

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Abstract The development of mobile phones has largely increased human interactions. Whilst the use of these devices for communication has received significant attention, there has been little analysis of more passive interactions. Through census data on casual social groups, this work suggests a clear pattern of mobile phones being carried in people’s hands, without the person using it (that is, not looking at it). Moreover, this study suggests that when individuals join members of the opposite sex there is a clear tendency to stop holding mobile phones whilst walking. Although it is not clear why people hold their phones whilst walking in such large proportions (38% of solitary women, and 31% of solitary men), we highlight several possible explanation for holding the device, including the need to advertise status and affluence, to maintain immediate connection with friends and family, and to mitigate feelings related to anxiety and security.
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Anbazhagan, R., G. Rekka, S. Rajamanickam, C. Dinesh, M. Ilayaraja, and V. Srirangaramanujaa. "Design and Simulation of Automated Swaging Machine." International Journal of Engineering & Technology 7, no. 3.34 (2018): 53. http://dx.doi.org/10.14419/ijet.v7i3.34.18715.

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One of the major time consuming factor on calculating the machine time for the job is loading and unloading. By decreasing the time taken during the loading and unloading of the job, play a significant role in increasing the production of the company. In the proposed study, the swaging machine is automated by means of simple but effective mechanism. The mechanism involves from lifting of the job from its initial position to the top of the slope with the help of slider operated by the pneumatic piston .Then, it is carried to the designated position in the work holding device with the help of controlled gravitational force by belt operated profile. The feeder attached to the swaging machine feed the job and bring back the job, back to the work holding device form there, it is carried to the unloading area by hooks attached belt conveyor. Position sensor is used to sense the position of the job and feed it as an input to operate the other Mechanisms. This work is a cyclic process which converts the swaging machine automated and work continuously. By this proposed work, the production increase, dependency on the reduction of man power, working hours of the swaging machine is increased.
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Labus, Nebojsa, Zorka Vasiljevic, Dana Vasiljevic-Radovic, Srdjan Rakic, and Maria Nikolic. "Two step sintering of ZnTiO3 nanopowder." Science of Sintering 49, no. 1 (2017): 51–60. http://dx.doi.org/10.2298/sos1701051l.

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Metastable nanopowder ZnTiO3 was pressed into cylindrical compacts at 200 MPa. Compacts were treated by conventional heating with isothermal holding at 931?C for 10 minutes, 25 minutes and 40 minutes. ZnTiO3 compacts were also heated with a two-step sintering schedule with maximal 913?C and isothermal holding at 896?C, for approximately the same holding times as the isothermal schedule. Shrinkage during heating was monitored with a dilatometric device, while microstructure was determined with atomic force microscopy. XRD patterns were collected for the most interesting samples. Microstructures of sintered specimens showed differences introduced during the last sintering stage by the two different heating schedules. Goal of the presented work was to discuss the possible sintering mechanisms for the two step sintering schedulle according to the presented results.
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Wen, Sen, Xingtian Yin, Haixia Xie, et al. "Vapor transport deposition of Sb2Se3 thin films for photodetector application." Journal of Advanced Dielectrics 10, no. 04 (2020): 2050016. http://dx.doi.org/10.1142/s2010135x20500162.

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Antimony selenide is a promising semiconductor with great application potential in the fields of optoelectronic devices. In this work, the vapor transport deposition (VTD) method is employed to prepare Sb2Se3 films on substrates. The influence of deposition temperature, distance between the Sb2Se3 sources and substrate, and the deposition holding time on the film morphology is investigated in detail. The deposited Sb2Se3 thin film is employed to fabricate photodetector with a structure of ITO/SnO2/Sb2Se3/Au, where the spin-coated SnO2 film is used as the buffer layer. The device demonstrates relative high responsivity in the range of 300–1000[Formula: see text]nm with a maximum value of 312[Formula: see text]mA W[Formula: see text] at 750[Formula: see text]nm.
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Dissertations / Theses on the topic "Work Holding Device"

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Urbánek, Aleš. "Vytvoření technologie obrábění lopatkového kola." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229191.

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This diploma work deals with manufacturing technology of a turbine wheel. In first part is introduced description of equipment used for reverse engineering. In next part are clamping possibilities for cutting operations. The part of this diploma thesis is verification of a semi-product using ATOS system and proposal of establishment and clamping. Purpose of the work is technology preparation and production of clamping device for milling by the machining centre MCV 1210.
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Books on the topic "Work Holding Device"

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Drell, Joanna. Aristocratic Economies. Edited by Judith Bennett and Ruth Karras. Oxford University Press, 2013. http://dx.doi.org/10.1093/oxfordhb/9780199582174.013.001.

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This essay examines the economic activities and "work" of aristocratic women, c.1000–c.1400. Despite the limitations posed by law, custom, and social expectation, women played a central role in preserving and transferring family wealth through marriage, gifts, and inheritance. They were equally crucial in matters of household and estate management. Both older and recent scholarship explores the complexity of the woman's experience within the European family. Her role was neither rigidly static nor in perpetual flux. The diversity of a woman's economic responsibilities and her influence in the family reveal the inherent flexibility of the medieval family, once considered staunchly patriarchal. While some have argued that the patrilineal descent group was narrowing in this period, medieval families devised strategies to preserve the integrity of their holdings and to provide for a range of kin, regardless of gender.
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Book chapters on the topic "Work Holding Device"

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Okoli, John U., and Tamuno K. Jinyemiema. "Versatile Work Holding Device for Hole Drilling in Small-Scale Production Workshops." In Advanced Materials Research. Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-450-2.481.

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Ito, Yoshimi, and Takashi Matsumura. "Work and Tool Holding Devices—Chuck, Centre, Mandrel and Tool Holder." In Theory and Practice in Machining Systems. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-53901-0_5.

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Wilk, Stephen R. "The Claude Lorrain Mirror." In Sandbows and Black Lights. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780197518571.003.0040.

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In the late 18th century, aesthetes would tour the countryside to view scenes in a device called the Claude Lorrain mirror. The Claude Lorrain mirror was a black convex mirror that was stored in a padded case. Viewers would set up the scene with great care, holding the mirror before them and looking at the scene behind them in reflection, as if arranging the shoot for a photograph. But there was no way that they could subsequently record the scene, since the samera had not yet been invented, and so they only had their memories of the image so carefully created. How did these devices work, and why did people use them?
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Kershaw, David. "The Market for Corporate Control: Value, Stakeholders, and Governance." In Principles of Takeover Regulation. Oxford University Press, 2016. http://dx.doi.org/10.1093/oso/9780199659555.003.0001.

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This Chapter introduces the market for corporate control and provides theoretical and empirical context about the functioning and effects of the market for corporate control. Ideally such context should inform the analysis and evaluation of the Takeover Code’s regulation of the UK market for corporate control. However, as the Chapter shows, neither our understanding of the likely effects of the market for corporate control on companies, boards, shareholders and stakeholders, nor the state of empirical evidence provide clear cut guidance on how to regulate the market for corporate control. The Chapter considers evidence on the value effects of takeovers and shows that evidence from the short term market response to announced takeovers supports claims that takeovers in aggregate generate value, but the longer term evidence is more mixed and inconclusive. It also considers the methodological limitations of both the short term and long term evidence. The Chapter then proceeds to consider the effect of the market for corporate control on stakeholders. It explores the commonly held view that takeovers are detrimental for employees but finds again that the empirical evidence is inconclusive, although the theoretical case that takeover activity may undermine employee investment in the business remains compelling. The Chapter then explores the role of the market for corporate control as a governance device. It is often assumed that the market for corporate control acts as a disciplinary device holding managers to account, but as the Chapter shows the disciplinary effects work differently and less precisely than regulators and the public debate commonly assume. The Chapter also shows that such indirect effects may also mould management and board behaviour in economically suboptimal ways, which the Chapter considers in the context of the debate about the possible short term orientation of UK boards.
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Mindus, Patricia. "What Does E- add to Democracy?" In Advances in Public Policy and Administration. IGI Global, 2014. http://dx.doi.org/10.4018/978-1-4666-6038-0.ch013.

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Technologies carry politics since they embed values. It is therefore surprising that mainstream political and legal theory have taken the issue so lightly. Compared to what has been going on over the past few decades in the other branches of practical thought, namely ethics, economics, and the law, political theory lags behind. Yet the current emphasis on Internet politics that polarizes the apologists holding the Web to overcome the one-to-many architecture of opinion building in traditional representative democracy, and the critics who warn that cyber-optimism entails authoritarian technocracy has acted as a wake up call. This chapter sets the problem, “What is it about ICTs, as opposed to previous technical devices, that impact on politics and determine uncertainty about democratic matters?,” into the broad context of practical philosophy by offering a conceptual map of clusters of micro-problems and concrete examples relating to “e-democracy.” The point is to highlight when and why the hyphen of e-democracy has a conjunctive or a disjunctive function in respect to stocktaking from past experiences and settled democratic theories. The chapter's claim is that there is considerable scope to analyse how and why online politics fail or succeed. The field needs both further empirical and theoretical work.
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Conference papers on the topic "Work Holding Device"

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Oliveira, Ricardo F., José Carlos Teixeira, Helena Maria C. Marques, and Senhorinha F. Teixeira. "An Experimental Setup for API Assessment of a Valved Holding Chamber Device." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65111.

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Typically for young children and elders, the asthma treatment procedure using pMDI devices bring some usage coordination difficulties. Therefore, and accordingly to several asthma treatment guidelines, the prescription of a VHC, as an add-on device for the pMDI, is advisable. These devices consist of an expansion chamber where the air slows down, as well as, the pMDI spray plume. Allowing the patient to breathe whenever he wants, independently from the moment of the pMDI actuation, also reduces the “cold-freon” effect and allows a more effective evaporation of the propellant. The effectiveness evaluation of VHC and pMDI devices is made through the quantification of drug delivered to the patient lungs. A simple collection filter is not enough for an accurate assessment of the device. Since the size of the particles delivered matter the most, the use of an impaction apparatus is essential. Accordingly to the Canadian normative for VHC assessment (CAN/CSA/Z264.1-02:2008), the experimental testing shall be done by using a breath simulator instead of a constant flow pump. The evolution of these tests shall move towards more realistic testing conditions. This work reports the project and construction an experimental setup for a correct assessment of the VHC devices effectiveness. The experimental setup is based in the work of Foss & Keppel (1999) and the contribution of Finlay (1998) and Miller (2002). The project and optimization of the major components, such as, breath cycle simulator by means of a cam-follower mechanism, a mixing cone and the vacuum pump used, are herein described and discussed.
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Mathew, Y. Ras, and J. Gowtham. "Design and fabrication of work holding device for Drilling and spot facing of bucket wheel excavator teeth." In 2010 Frontiers in Automobile and Mechanical Engineering (FAME). IEEE, 2010. http://dx.doi.org/10.1109/fame.2010.5714817.

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Boldering, Alexander L., Gunnar Borchert, Annika Raatz, and Klaus Dröder. "System Identification of a Grinding Machine Excited by an Active Tool Holding Device." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-64380.

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Reducing the cost of manufacturing products can be realized by high performance, precise and productive machine tools. This goal is often obtained by the user increasing the adjustable machine parameters, which include the feed rate or the cut depth. Both will increase the grinding force during the grinding process, which can result in an excitation of the machine structure. If the excitation is too high, the machine structure can show an undesired dynamic behavior, which can cause the machine to vibrate. These vibrations can result in chatter marks on the work piece surface and if large enough can result in a production stop. One possibility to minimize the chance of excessive vibration is a conservative choice of machine parameters which are well below the optimal set for a particular machine. This paper presents an approach which shows the first results of an active tool holding device aimed at reducing unwanted vibrations resulting from an aggressive parameter choice.
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Tsukiji, Tetsuhiro, and Shinsuke Katsumata. "CFD Analysis in a Non-Contact Holder." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-03020.

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There are many devices that use air flow characteristics. Recently an electric fan without propeller using air jet flow and a vacuum cleaner using swirling air flow have been developed by Dyson Ltd. Furthermore, as one of the applications of such air flow, a non-contact holder that can hold a body such as a work piece, disc etc., using low-pressure region generated by air flow without contact was developed by a Japanese company. Some bodies such as work piece are brought without contact with the holder. The mechanism to hold them is explained by Bernoulli’s theorem. However, systematic research has not been done in the present stage and the effect of the geometry of the non-contact holder on the holding force is not clear. In this paper, we calculated the flow in a non-contact holder and obtained the force to hold a body by CFD analysis. The effect of the deflector and inside geometry of the holder on the velocity and pressure distribution, and holding force is investigated. The deflector is a device fixed with the holder to increase the holding force using low-pressure region. CFD was done using both incompressible and compressible flow, and k-ε turbulent model was used. The calculated pressure distributions of a simpler model of the holder are compared with the previous experimental results to confirm our calculation method. The design policy of a non-contact holder is discussed based on the calculated results of velocity and pressure distributions and holding force. Consequently we show that the deflector is very useful to obtain high holding force and the concept to design the non-contact holder is required to get the holding force according to the weight of the body and to achieve high efficiency.
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Zanlucchi, Stefano, Pierangelo Masarati, and Giuseppe Quaranta. "A Pilot-Control Device Model for Helicopter Sensitivity to Collective Bounce." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34479.

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This work presents a parametric dynamic model of a helicopter collective control inceptor that includes the biodynamics of the pilot. The biodynamic feedthrough and neuromuscular admittance of a helicopter pilot are characterized using a detailed multibody analysis of the pilot’s left arm holding the inceptor as a ‘virtual experiment’ to produce the results required to identify the parameters of the coupled system. The goal is to develop an analytical model of the dynamics of the coupled pilot-device system and gain insight into the effect of several design parameters on the characteristics of the coupled system. The effect of device inertia, damping, stiffness and friction on the stability margins of the coupled system with respect to the collective bounce instability phenomenon are analyzed and discussed. The analytical model is verified using it in place of the detailed multibody model of the pilot’s arm in the fully detailed multibody simulation of the coupled system. It is then used in linearized analysis of the complete system in support of the vehicle design.
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Fernandes, Antonio Carlos, Melquisedec Francisco dos Santos, Jairo Bastos de Araujo, Jose´ Carlos Lima de Almeida, Roge´rio Diniz, and Vinicius Matos. "Hydrodynamic Aspects of the Torpedo Anchor Installation." In ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2005. http://dx.doi.org/10.1115/omae2005-67201.

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The torpedo anchor is a novel kind of device to moor floating offshore structures. It has been proved in practice that this kind of anchoring may be used for both drilling and production offshore activities. For drilling, it is indeed easily recoverable and for large production, it has enough holding power even for large production platforms. There are a lot of soil-interaction aspects to be considered and the installation is one of them. The installation procedure is to release the torpedo from a high enough position from the sea bottom to allow the device to reach the terminal velocity: A correct amount of kinetic energy at the bottom is essential for the penetration. Besides this, the anchor has to reach the bottom in a vertically up right in order to maximize the final holding power in all directions. Therefore, the work addresses two hydrodynamic aspects for the installation design and analysis. The first is the drag minimization and the second is the directional stability. If the drag is be kept to a minimum (without compromising, later on, the soil interaction) then the terminal velocity is higher. The work shows that parameters like the mass and the shape are essential for this. On the other hand, the shape and mass distribution have a strong influence on the directional stability. One important parameter is the rear line length connected to the anchor, which is necessary for further connection with the final mooring line: this parameter influences both the terminal velocity and the directional stability. The presence of the rear line and its role is a novel problem and it seems to have no parallel in other filed applications. The work addresses all this aspects under the light of a novel model testing performed in a model basin that is 15 m deep. It is important to say that this model testing procedure has been conceived to attend specifically the torpedo anchor evaluation. For that matter, the work presents an extrapolating mathematical model. Besides that, an analytical model is shown for the directional stability, together with time domain numerical evaluation. Different model have been used in the tests performed with and without the rear line. Finally, the work presents the model testing design including the use of imaging processing to get the anchor tracking during the launching.
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Walker, James, Shenguang Sheng, A. G. Agwu Nnanna, and Lincang Li. "Correlation of Direct Evaporative Cooling Efficiency With Media Porosity." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-39709.

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. Energy consumption of HVAC&R could be reduced by integrating evaporative cooling device into air conditioning systems. Direct Evaporative Cooling (DEC) are suited for climates where the air is hot and humidity is low. In DEC, heat is absorbed whenever water is evaporated and converted to water vapor. By passing through or around a wetted surface, heat is removed from the surrounding air in the vaporization of the water. The process approximates the adiabatic-saturation process and the path lies on a constant wet-bulb temperature which is a constant enthalpy line. The wetted surface area in direct evaporative cooling depends on porosity and absorptivity of the media. This paper evaluates the effect of media porosity on performance of a Direct Evaporative Cooling system. In this experimental work, the porosity is varied by changing the packing density and volume of media. The packing material allows air and water to come in direct contact. Holding all other variables like mass flow rates and inlet dry-bulb temperature constant, the effect Porosity on DEC performance is studied. The performance of DEC system is a function of porosity, dry- and wet-bulb temperatures and relative humidity. Efficiency increases with porosity.
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Guo, Zhonghua, Zhongsheng Sun, and Xiaoning Li. "Design and Fabrication of Pneumatic Soft Gripper." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86648.

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In this paper, a pneumatic soft gripper is proposed with inspiration from sea anemone. The gripper is composed of an actuator and several silicone tentacles. With the power of compressed air, the soft actuator expands and folds the tentacles. The gripper wraps tentacles around the object and highly compliant tentacles conforms to the shapes of an object, enveloping and holding it. The physical model is fabricated with 3D printed PLA mold and silicone gel. The gripping mechanics are analyzed according to the experimental gripping operations. On basis of the experimental and analysis result, the compliant gripping is realized while the stability is to be increased. So the tentacle structure is then improved by multi-chamber soft body and vacuum jamming bag. The jamming bag is combined to the end of each tentacle, where the bag is filled with particles to conform to the object shape. Therefore, a reliable constraint is realized between the gripper and the object under vacuum conditions. The bending motion and shaping effect are verified through theoretical and experimental approaches. The important parameters in the vacuum jamming process are also obtained. With such device, soft adaptive bodies enlarges the contact area to adapt to the work-piece where vacuum jamming bags increase the gripping force and stability. It is convenient for universal gripping operation for objects with different shapes.
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Olszewski, Pawel. "Optimization of Working Ground Heat Storage With Seasonal Regeneration." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14393.

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The aim of the research was an optimization of long-term heat storage with seasonal regeneration. Energy consumption for central heating during wintertime, transfererred from ground energy storage using a heat exchange device, is the operating principle of such systems. Warmed working fluid is then used in a heat pump system. However, more accurate calculations showed that over time of usage, there is a trend toward cooling at deeper round layers. Such a situation leads to a lowering of ground potential when using heat pump systems. A possible solution to this problem is the application of summer regeneration: during summer months, the working fluid is firstly warmed in solar collectors, and then forced into the same boreholes. The numerical model of a vertical, ground heat exchange device (configured as a "pipe in pipe", known as a Fields' pipe) was specially developed. Temperature distribution of the working fluid along the pipe was one of the boundary conditions, for the co-axial, time-variable, heat conduction task, which described the heat flow in energy storage. The numerical simulation of solar collectors work was based on the Hottel - Whillier - Bliss equation, in which energy flow from the solar collector is calculated, dependant on external parameters such as: insulation or ambience temperature. The combination of three computational parts- the ground heat exchange device, energy storage area and solar collectors battery- allows the target function to be defined for task optimization. The subject of optimization was an energy quantity, which can be taken from energy underground storage, and then utilized by the heat pump system. In the summarized paper, a combination of the input data, which influenced the efficiency of energy storage, was chosen. Hypothetical data were: outside diameter and length of heat exchange device, distance between pipes, fluid flow through the pipe during charge and discharge processes or temperature of inlet working fluid. The influence of individual parameters on the target function, holding all input data constant, was analyzed. A developed evolutionary numerical code known as GENOCOP I (GEnetic algorithm for Numerical Optimization for COnstrained Problems) [3] was used for optimization. After preliminary correction of boundary values of the input data, nine attempts of optimization were taken up. The research results identified optimal values of input parameters for which maximum energy could be taken from ground storage.
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Das, Diganta, Satyandra K. Gupta, and Dana S. Nau. "Estimation of Setup Time for Machined Parts: Accounting for Work-Holding Constraints Using a Vise." In ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium collocated with the ASME 1995 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/cie1995-0793.

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Abstract For machined parts, setup time is a major component of the total time required to manufacture a machined part from a stock. If the number of setups and hence setup time can be reduced, this will not only decrease the manufacturing time, but will also ensure better machining accuracy, require fewer work-holding devices and increase machine usage time. To achieve any improvement in setup time, first we need to estimate the setup time accurately. In this paper we propose a methodology to estimate the setup time for machining prismatic parts in a three axis vertical machining center. We concurrently consider three major factors for estimating the number of setups, namely — the precedence constraints among machining operations, the feasibility of work holding using vise clamping, and the availability of datum faces for locating the workpiece on the machine table during machining on a 3 axis vertical machining center.
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