Готові списки джерел за темами / Electrolytic grinding Mathematical models

Добірка наукової літератури з теми "Electrolytic grinding Mathematical models"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 29 січня 2023

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Статті в журналах з теми "Electrolytic grinding Mathematical models"

Chen, Fan, Bo Zhao, Xiao-feng Jia, Chong-yang Zhao, and Jing-lin Tong. "Grinding Parameter Optimization of Ultrasound-Aided Electrolytic in Process Dressing for Finishing Nanocomposite Ceramics." Mathematical Problems in Engineering 2016 (2016): 1–13. http://dx.doi.org/10.1155/2016/7896035.

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In order to achieve the precision and efficient processing of nanocomposite ceramics, the ultrasound-aided electrolytic in process dressing method was proposed. But how to realize grinding parameter optimization, that is, the maximum processing efficiency, on the premise of the assurance of best workpiece quality is a problem that needs to be solved urgently. Firstly, this research investigated the influence of grinding parameters on material removal rate and critical ductile depth, and their mathematic models based on the existing models were developed to simulate the material removal process. Then, on the basis of parameter sensitivity analysis based on partial derivative, the sensitivity models of material removal rates on grinding parameter were established and computed quantitatively by MATLAB, and the key grinding parameter for optimal grinding process was found. Finally, the theoretical analyses were verified by experiments: the material removal rate increases with the increase of grinding parameters, including grinding depth (ap), axial feeding speed (fa), workpiece speed (Vw), and wheel speed (Vs); the parameter sensitivity of material removal rate was in a descending order asap>fa>Vw>Vs; the most sensitive parameter (ap) was optimized and it was found that the better machining result has been obtained whenapwas about 3.73 μm.

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Molla, K. Z., and Alakesh Manna. "Optimization of Electrochemical Grinding Parameters for Effective Finishing of Hybrid Al/(Al2O3+ZrO2) MMC." International Journal of Surface Engineering and Interdisciplinary Materials Science 1, no. 2 (July 2013): 35–45. http://dx.doi.org/10.4018/ijseims.2013070104.

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In this study, the Taguchi method, a powerful tool in the design of experiment is used to optimize electrochemical grinding (ECG) parameters for effective finishing of hybrid Al/(Al2O3+ZrO2) MMC using a resin bonded cupper impregnated diamond grinding wheel. An orthogonal L27 (313) array is used for 35 factorial design and analysis of variance (ANOVA) is employed to investigate the influence of grinding wheel speed, electrolyte concentration, D.C. supply voltage, current density and work-piece speed on the surface finish, Ra and Rt respectively. Test results reveal that the Ra and Rt both are lesser at moderate grinding wheel speed i.e. 9000 rpm with current density 0.25A/mm2 and 30% electrolyte concentration. Taking all five parameters considered for experimentation and using multivariable higher order regression, mathematical models for surface finish, Ra and Rt are established to investigate the influence of Electrochemical Grinding (ECG) parameters during finishing of hybrid Al/(Al2O3+ZrO2) MMC. Confirmation test results established that the developed mathematical models are appropriate for effective representing the surface finish criteria, Ra and Rt (µm).

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Chen, Fan, Bo Zhao, Xiaofeng Jia, and Xiaobo Wang. "Material removal rate for nanocomposite ceramics in ultrasound-aided electrolytic in process dressing." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 21 (July 13, 2016): 3987–98. http://dx.doi.org/10.1177/0954406216659678.

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Nanocomposite ceramics possess beneficial mechanical and physical characteristics over traditional engineering ceramics; however, there is currently no effective method of machining nanocomposites ceramics. This paper proposes a new ultrasound-aided electrolytic in-process dressing machining method. There are many factors influencing the material removal rate in the ultrasound-aided electrolytic in-process dressing grinding. In order to optimize the processing parameters and guide practice, the material removal models are developed to simulate the material removal process based on ductile failure and brittle rupture models, and the influence of grinding parameters on material removal rates is obtained. With the model, the influence of grinding parameters on the material removal rate is analyzed by MATLAB. The analysis results are verified by the ultrasound-aided electrolytic in-process dressing grinding test: the material removal rate increases with the increase of grinding parameters; depth of cut significantly improves material removal rate, followed by axial feeding speed, wheel speed, and workpiece speed that are less important; considering the comprehensive processing effect, depth of cut is the key parameter with the optimal setting at about 3.73 µm. The ultrasound-aided electrolytic in-process dressing grinding test not only proves the reliability of the model, but also proves that the ultrasound-aided electrolytic in-process dressing grinding can improve the ductile machining effect, when compared to electrolytic in-process dressing grinding, which is suitable for mirror machining of the nanocomposite materials.

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Zhang, Jia-Bo, Yang Yang, Xiao-Hui Zhang, Jia-Liang Guan, Li-Yan Zheng, and Guang Li. "Experimental study on the characteristic and function of oxide film formed on grinding wheel in ELID precision grinding." Industrial Lubrication and Tribology 72, no. 5 (October 10, 2019): 549–55. http://dx.doi.org/10.1108/ilt-04-2019-0164.

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Purpose The purpose of this study is to investigate the characteristic and function of oxide film formed on grinding wheel in electrolytic in-process dressing (ELID) precision grinding and improve the quality of ELID grinding. Design/methodology/approach Dynamic film forming experiments were carried out with a simulation device close to the actual processing conditions. Then, the ELID grinding experiments of bearing rings were performed using grinding wheels with good film forming effect. The experiment was designed by quadratic regression general rotation combination method. The influence of grinding depth, electrolytic voltage, duty cycle and grinding wheel linear speed on grinding effect is analyzed. Findings A mathematical model for the formation rate of oxide film was established. The experiments show that the composition of grinding wheel and grinding fluid, as well as the electrical parameters, influence the film forming effect. Thus, the oxide film plays an important role in ELID grinding. Originality/value This study provides a reference for the design and selection of grinding wheel and grinding fluid and the setting of process parameters in ELID grinding.

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Rahman, Mustafizur, A. Senthil Kumar, and I. Biswas. "A Review of Electrolytic In-Process Dressing (ELID) Grinding." Key Engineering Materials 404 (January 2009): 45–59. http://dx.doi.org/10.4028/www.scientific.net/kem.404.45.

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ELID Grinding, since its introduction over two decades ago, has helped in material removal of hard and difficult-to-cut engineering materials. A gist of the important research milestones on the process has been organized in this report. The hybrid process of ELID Grinding has a simultaneous electrolytic reaction and grinding action. Electrolysis takes place between the conductive anodic wheel and highly conductive cathode in presence of a special electrolyte. The resulting anodic oxide wears off easily to allow efficient grinding. The different parameters involved in electrolysis complicate the mechanism of grinding and makes it significantly different from conventional grinding. Different variants of the process have also been reported, though the basic philosophy of operation is the same as basic ELID. Several authors have also suggested mathematical explanations, among other fundamental studies, that provide further insight. The basic components of the process, machine tool, power supply, grinding wheel, electrode and electrolytes, have also undergone several modifications and developments to deliver better results and suit specific purposes. The process has been successfully applied in stock removal operations for hard and brittle ceramic materials with low grinding forces compared to conventional grinding. Fine finishing of almost all kinds of hard and brittle materials, ranging from hardened steels, BK7 glass, mono-crystalline silicon, silicon carbide, aluminum nitride, silicon nitride etc, has been successfully carried out, to provide high quality surfaces with low sub-surface damage. Finally, discussions on the different stages of evolution of the process have been put forward as a conclusion to the report.

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Ovchinnikov, P. "Mathematical models for fine grinding of powders." Advanced Powder Technology 4, no. 3 (1993): 179–89. http://dx.doi.org/10.1016/s0921-8831(08)60641-x.

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Liu, Chia-Chang, and Chung-Biau Tsay. "Mathematical Models and Contact Simulations of Concave Beveloid Gears." Journal of Mechanical Design 124, no. 4 (November 26, 2002): 753–60. http://dx.doi.org/10.1115/1.1517563.

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This study presents two mathematical models of concave beveloid gears ground by Mitome’s grinding method and by the novel grinding method proposed by the authors. Based on the developed mathematical models, the contact simulations are performed and the characteristics of concave beveloid gear pairs are investigated. Simulation results indicate that our novel grinding method ameliorates the drawback of Mitome’s grinding method by eliminating the transmission error of the helical concave beveloid gear pairs. In contrast to conventional beveloid gear pairs, the gears ground by the proposed novel grinding method not only have larger contact ellipses, but also mesh conjugately with non-parallel axes, although assembly errors exist.

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Hu, S. J., Zhi Xiong Zhou, and T. Y. Long. "Mathematical Models and Grinding Research for Step Drill." Key Engineering Materials 259-260 (March 2004): 411–14. http://dx.doi.org/10.4028/www.scientific.net/kem.259-260.411.

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Wattis, Jonathan A. D. "Mathematical Models of the Homochiralisation of Crystals by Grinding." Origins of Life and Evolution of Biospheres 41, no. 2 (August 4, 2010): 133–73. http://dx.doi.org/10.1007/s11084-010-9221-2.

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Koltsova, Eleonora, Natalia Mamonova, Anna Shaneva, Michael Babkin, Nelly Popova, and Eugene Zharikov. "Modeling and Optimization of the Fabrication of Al₂O₃- Based Ceramocomposites Reinforced with Carbon Nanotubes." Materials Science Forum 995 (June 2020): 27–33. http://dx.doi.org/10.4028/www.scientific.net/msf.995.27.

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The physico-mechanical properties of ceramic-matrix Al2O3-based composites are strongly influenced by the particle size of Al2O3, the presence of carbon nanotubes (CNTs), and the temperature regimes of sintering. In order to obtain the very low porosity ceramic composites with high rates of flexural strength and crack resistance, mathematical models were developed for grinding the particles of Al2O3 and spark plasma sintering of the composite. Mathematical models were based on the equations of the balance of the number of particles by size taking into account their grinding (for the grinding stage), the balance of pores in the composite by the size (for the sintering stage). The kinetic parameters of mathematical models were determined and a good agreement was reached between the calculated and experimental results. The developed models were used to determine the optimal modes of grinding and sintering stages, which made it possible to obtain, in particular, the composite Al2O3 - CNT (20 vol. %) with bending strength 540 MPa, and crack resistance 6.3 MPa·m1/2.

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Дисертації з теми "Electrolytic grinding Mathematical models"

Razavi, H. Ali. "Identification and control of grinding processes for intermetalic [sic] compunds [sic]." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/18917.

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Hecker, Rogelio Lorenzo. "Power feedback control in cylindrical grinding process." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/16619.

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Ramoneda, Igor M. "Force modeling in surface grinding based on the wheel topography analysis." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/18845.

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Ni, Meng, and 倪萌. "Mathematical modeling of solid oxide steam electrolyzer for hydrogen production." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B39011409.

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Garcia, Victor Hugo Guzzo. "Modelagem computacional da corrosão por pites em aço inoxidável: efeito do potencial e de inclusões de MnS." Universidade do Estado do Rio de Janeiro, 2009. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=1243.

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Nesta dissertação, é apresentada uma rotina computacional para modelar a corrosão por pites em aço inoxidável baseada em modelos matemáticos existentes que levam em consideração efeitos determinísticos e estocásticos. Como contribuição, modificações baseadas em resultados experimentais foram inseridas no modelo, com o objetivo de avaliar a influência de inclusões de MnS na matriz metálica, locais típicos de maior nucleação de pites. Foi modelado também o efeito do potencial de aplicado verificando-se assim a sua influência na formação de pites e a determinação da faixa possível para o potencial de pite. A modelagem consiste da avaliação espaço-temporal da nucleação, com a possibilidade de visualização da evolução de pites metaestáveis e estáveis, além do transiente de corrente anódica gerado pelo processo. Os resultados são apresentados em termos da avaliação das variáveis de maior influência na suscetibilidade de formação de pites, tais como concentração de espécies agressivas, dano à camada passiva e queda no potencial ôhmico, o que possibilita estudos futuros para se obter formas mais eficientes de combate à corrosão por pites.
In this work is presented a computational routine to model pitting corrosion of stainless steel based on pre-existing mathematical models that take into account deterministics and stochastic effects. As contribution, modifications based on experimental results were inserted, evaluating the influence of MnS inclusions on metal surface, a typical site of major pitting nucleation. Applied potential effect was modeled, thus, it was possible to verify its influence on pitting formation and the possible range of pitting. The model consists on spatio-temporal evaluating of nucleation process, with visualization of metastable and stable pitting evolution and the anodic current transient. The results are presented in terms of variables with greatest influence on the susceptibility of pitting formation, such as concentration of aggressive species, passivity layer damage and ohmic potential drop, allowing future studies to obtains more efficient ways to combat pitting corrosion

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Campbell, Quentin Peter. "The optimization of a grinding circuit." Thesis, 1995. http://hdl.handle.net/10539/22072.

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A dissertation submitted to the Faculty of Engineenug, University of the Witwatersrand, in fulfilment. of the requirements for the degree of Master of Science in Engineering,
A multi variable control strategy for a grinding circuit at East Driefontein has been implemented by others and has enabled it to operate under stable conditions. The next development needed was to find conditions under which tne efficiency of the circuit was the greatest. Optimum set points exist for the multi variable controller to keep the circuit at its most efficient state. This project was done to determine these set points, and how it affected the operation of the circuit. The strategy involved the collection of process data, the development of mathematical models and the determination of these optimum set points by simulation, This option reduced interference with routine production operations, which is often a prohibiting factor during any development work on an existing process. The optimum set points were successfully determined, and were compared with previous findings and current plant practice.
AC2017

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Sokur, M., V. S. Biletskyi, M. Fyk, O. Fyk, and I. Zaselskiy. "The study of the lining layer abrasing wear in the semiautogenous grinding mill." Thesis, 2020. http://repository.kpi.kharkov.ua/handle/KhPI-Press/46212.

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In this work complex investigations of the abrasing wear of lining of self-grinding mills (semiautogenous grinding mills) are carried out with the obtaining of mathematical models of wear-abrasing of elevators in terms of height, weight, volume and worn-out area. In particular, according to the location and nature of the abrasing wear processes, the liner-lifters mill self-grinding are identified in three typical groups. During 1 year, in the conditions of Ingulets GOK, the monitoring of the abrasing wear of selected groups of lifters of self-grinding mills was performed. On the basis of the experimental data calculationed in the Microsoft Office Excel program, a set of mathematical models of lifter abrasing wear was obtained in terms of height, weight, volume and worn-out area. The obtained dependencies are recommended for prediction of abrasing wear of lining and necessary frequency of replacement of inserts-lifters. In addition, the research of wear of lining made of cast iron RF–4, showed a significant reduction in their abrasing wear compared with steel 110G13L. Thus, it has been shown that the selection of liner-lifters materials can reduce the inter–repair period by 3 times or more (replacement of worn-out lifters). A comparison of the actual picture of the abrasing wear of elevators and Simulation Statics simulated result (using SolidWorks) stresses shows the convergence of the arrangement of the zones of maximum stresses and the maximum abrasing wear of the lining. Investigation of the influence of the stressed state of lining plates on the intensity of their abrasing wear – a promising direction for further research.

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Книги з теми "Electrolytic grinding Mathematical models"

Miller, J. D. Measurement and prediction of mineral liberation during grinding: Final report. [Salt Lake City, UT: Dept. of Metallurgical Engineering, University of Utah, 1991.

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Symposium on Modeling and Simulation of Electrolytic Solution Processes (1987 New York, N.Y.). Proceedings of the Symposium on Modeling and Simulation of Electrolytic Solution Processes. Pennington, NJ (10 So. Main St., Pennington 08534-2896): Electrochemical Society, 1988.

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Hindagolla, Suraj L. A study of the oxide/solution interface by capacitance measurements of electrolyte/oxide/semiconductor structures and potentiometric titrations of colloidal oxide suspensions. 1985.

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A mathematical model of a lithium thionyl chloride primary cell. [Washington, DC: National Aeronautics and Space Administration, 1987.

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Частини книг з теми "Electrolytic grinding Mathematical models"

Vansevenant, E. "Prediction of Residual Stresses in Grinding Operations on the Basis of Mathematical Models." In International Conference on Residual Stresses, 460–66. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-1143-7_77.

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Manna, Alakesh. "Taguchi, Fuzzy Logic and Grey Relational Analysis Based Optimization of ECSM Process during Micro Machining of E-Glass-Fibre-Epoxy Composite." In Computational Methods for Optimizing Manufacturing Technology, 242–61. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-4666-0128-4.ch010.

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In this chapter, the use of Taguchi method, Fuzzy logic, and Grey relational analysis based on an L16 (45) orthogonal array for optimizing the multi response process characteristics during electrochemical spark machining (ECSM) of electrically non-conductive e-glass-fibre-epoxy composite (e-glass-FEC) is reported. An electrochemical spark machining setup has been designed and fabricated for micro machining of e-glass-FEC and experimental results are utilized for optimizing the process parameter (DC supply voltage, Electrolyte concentration, and Gap between tool and auxiliary electrode) with considerations of the multiple responses such as material removal rate and over cut on hole radius effectively. From the analysis, it is found that at higher setting value of DC supply voltage (e.g. 70 volts) and at moderate setting value of electrolytic concentration (e.g. 80 g/l) and 180 mm gap between tool and auxiliary electrode the material removal rate (MRR) is maximum. Utilizing the test results, mathematical models for MRR and overcut on hole radius are developed to predict the setting value of ECSM parameters in advance.

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Тези доповідей конференцій з теми "Electrolytic grinding Mathematical models"

Wu, Shuihua, Kazem Kazerounian, Zhongxue Gan, and Yunquan Sun. "A Free Form Robotic Grinding System: A Mathematical Model and an Actual System." In ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/detc2010-29038.

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This paper presents a robotic grinding system for work pieces with free-form geometries. A mathematical model representing the kinematics and dynamics of the system is built in the first part of the paper. Offline programming, calibration and a novel method for robotic error compensation are utilized to accurately generate the robotic grinding path. Models of the robot, the grinder and the grinding process are integrated to obtain the dynamics of the system. In the second part of the paper, an actual system is presented, with experiments done to verify the kinematic accuracy of the system. A controller based on the target tracking theory is designed to extend the system’s capability of material removal control, the effectiveness of which is shown by the simulation results. In the future, the target-tracking control strategy will be integrated with the actual system to develop a robotic grinding system capable of material removal control for free-form work pieces.

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Artemov, I. I. "Features of the Grinding Technology with the Use of Nanomodified Coolant." In Modern Trends in Manufacturing Technologies and Equipment. Materials Research Forum LLC, 2022. http://dx.doi.org/10.21741/9781644901755-73.

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Abstract. The results of the analysis of the possibility of constructing a system for ensuring the quality of mechanical engineering parts by nanomodification of the surface layer are presented. The implementation is considered on the example of grinding technologies with nanomodified lubricating coolant. Mathematical models describing the process of creating conditions for nanomodification of the surface layer and algorithms for practical implementation are presented.

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Che, Demeng, Ping Guo, and Kornel F. Ehmann. "Design and Analysis of Helical Needle Tip Grinding Process." In ASME 2012 International Manufacturing Science and Engineering Conference collocated with the 40th North American Manufacturing Research Conference and in participation with the International Conference on Tribology Materials and Processing. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/msec2012-7274.

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A generalized helical needle tip geometry model, which can describe many typical needle tip geometries, including conical, bevel, blunt and helical shapes with proper geometric parameters, is presented based on analogy to the helical point drill geometry. The generality of this model offers a general way for manufacturing various needle tip geometries. A mathematical model of the helical needle tip geometry is provided along with the formulation of the kinematic model of the tip grinding process. The control strategy on a 5-axis grinding machine system is also developed to implement the designed kinematic model. The needle tip’s motions in the grinding process are simulated to characterize the effects of grinding parameters on needle tip properties and to predict the trajectory of the needle tip point during the grinding process. Finally, several types of needle geometries have been manufactured by the developed grinding process to verify the newly formulated models.

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Antoniou, Antonios, Cesar Celis, and Arturo Berastain. "A Mathematical Model to Predict Alkaline Electrolyzer Performance Based on Basic Physical Principles and Previous Models Reported in Literature." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-68815.

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Abstract Hydrogen production through electrolysis is an important research topic since the use of hydrogen as a fuel has the potential to significantly reduce gaseous emissions in near future. The electrolytic splitting of water into hydrogen and oxygen can be carried out using for instance electricity generated from renewable energy sources such as solar radiation. Electrolysis processes occurring in electrolyzer cells are complex phenomena and a clear and accurate mathematical representation of the referred processes is vital to accurate predict electrolyzer cells performance. So a comprehensive mathematical model capable of properly describing alkaline electrolyzer cells performance, in terms of efficiency and hydrogen production rate, is proposed in this work. The mathematical model is based on several physical concepts such as energy losses due to electron and ion transfer, entropy increase, electrolyte flow rate, and electrolyzer physical structure and construction material. Compared to existing models, the new proposed one is more complete as it includes more operational parameters (six) affecting cells performance. Once developed, the proposed model has been fine-tuned using experimental data available in literature. The results obtained using the new developed model are in good agreement with Ulleberg’s experimental data. Based on the work carried out here, it is concluded that developing a mathematical model based on physical principles is crucial in the comprehension of electrolysis related processes and how to utilize them in the simplest and most reliable way.

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Wang, Yancheng, Roland K. Chen, Bruce L. Tai, and Albert J. Shih. "Advanced Five-Plane Lancet Needle Design, Grinding, and Tissue Insertion." In ASME 2014 International Manufacturing Science and Engineering Conference collocated with the JSME 2014 International Conference on Materials and Processing and the 42nd North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/msec2014-4046.

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The needle with lancet point (NLP), having three planes at the tip to generate a sharp lancet point, is the most common needle tip geometry. This research presents two five-plane lancet needle designs, the five-plane lancet needle with two back bevels (FLN-B) and five-plane lancet needle with two front bevels (FLN-F), to study the effect of two additional bevel planes on the reduction of soft tissue insertion force over that of the NLP. The mathematical models for inclination and rake angles along the cutting edges, and the grinding procedure and setup parameters for FLN-B and FLN-F are developed. Prototype needles are fabricated and the needle insert test was conducted on PVC phantom tissue which mimics the soft tissue. Compared to NLP, FLN-B and FLN-F have higher inclination and rake angles and can reduce the insertion forces by 9.1% and 8.3%, respectively.

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Lortz, Wolfgang, and Radu Pavel. "Fundamental Process Mechanics Common to Machining and Grinding Operations." In ASME 2020 15th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/msec2020-8371.

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Abstract All different production processes have one thing in common: in each case a workpiece with characteristic material behavior, stress, strain, self-hardening and temperature will be produced by a tool with special geometry and individual kinematic conditions, with a wide range of energy in a designed machine tool which is working along programmed lines. For the workpiece material, it is not important from which machine the energy is coming. To be able to predict more accurate values of the production process, it will be necessary to focus more on the complex and difficult process mechanics. The result must have a strong physical base and be in good agreement with practical results To solve these problems, we have to uncover all previous simplification assumptions for the existing models. This leads in a first step to a new fundament in process mechanics, which is only based on mathematics, physics and material behavior with friction conditions, and resulting temperatures during metal plastic flow. The new mathematical equations developed for yield shear stress and strain rate will be presented and discussed in this paper. The plastic deformation is the only parameter that will not disappear after completing the operation. Therefore, this will be the base to compare the developed theoretical deformation with the experimental results for two operations: cutting and grinding. In addition, it could be shown that yield shear stress and corresponding strain rate versus temperatures have an interdependent relationship, which creates the opportunity to determine the temperatures during metal plastic flow.

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Mas, Ronald, Antonios Antoniou, Cesar Celis, and Arturo Berastain. "A Comprehensive Analysis of an Electrolytic Hydrogen Production System Based on Solar Radiation for the Generation of Clean Energy." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-69444.

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Abstract A comprehensive analysis of electrolytic hydrogen production systems based on solar radiation is carried in this work. In the referred analysis, directly coupled photovoltaic-electrolyzer hydrogen production systems were studied. Specifically, the studied systems were split into three subsystems, (i) photovoltaic (PV) power production, (ii) electrolyzer based hydrogen production, and (iii) hydrogen storage in tanks, each of them having its own model considerations and restrictions. Detailed mathematical models for the referred subsystems, including different photovoltaic and electrolyzer related technologies, have been developed and utilized in the analyses performed here. In particular, employing the aforementioned mathematical models, a modeling and simulation platform has been developed. Once developed, such platform has been used to parametrically study the behavior of entire hydrogen production systems, accounting for key variables such as solar irradiance, photovoltaic modules and electrolyzer cells temperature, and hydrogen production rate. Several plant designs options have been firstly determined and from the obtained results a specific one has been selected to further assessments. The particular system studied here is currently in the design phase so the outcomes from this work will be used in future for not only properly sizing it but also building and testing it. It is expected that the implementation of large-scale green hydrogen production plants will reduce the impact of energy production systems on both health and environment.

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Yan, Lan, Zhixiong Zhou, and Cheng Lin. "An Optimization Design Method of Helical Drill Through Numerical Modeling and Simulation." In ASME 2009 International Manufacturing Science and Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/msec2009-84164.

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In order to realize the visualization design of helical drill, a helical drill numerical modeling and simulation CAD system has been developed based on drill mathematical models. Characteristics of helical drill, such as chisel edge shape, cutting lip shape, lip clearance angle distribution along the cutting lip, heel clearance angle distribution around the drill flank, et al., can be predicted through the calculation and simulation of the system. Therefore, drill geometric parameters can be modified reasonably to achieve the optimization of helical drills by analyzing the predicted characteristics of helical drill. Furthermore, according to a specific set of helical drill geometric parameters, a unique set of grinding parameters can be obtained, which can be used to realize the manufacture of helical drills.

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Manzhirov, Alexander V. "Mechanics of Growing Solids: New Track in Mechanical Engineering." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36712.

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A vast majority of objects around us arise from some growth processes. Many natural phenomena such as growth of biological tissues, glaciers, blocks of sedimentary and volcanic rocks, and space objects may serve as examples. Similar processes determine specific features of many industrial processes which include crystal growth, laser deposition, melt solidification, electrolytic formation, pyrolytic deposition, polymerization and concreting technologies. Recent researches indicates that growing solids exhibit properties dramatically different from those of conventional solids, and the classical solid mechanics cannot be used to model their behavior. The old approaches should be replaced by new ideas and methods of modern mechanics, mathematics, physics, and engineering sciences. Thus, there is a new track in solid mechanic that deals with the construction of adequate models for solid growth processes. The fundamentals of the mathematical theory of growing solids are under consideration. We focus on the surface growth when deposition of a new material occurs at the boundary of a growing solid. Two approaches are discussed. The first one deals with the direct formulation of the mathematical theory of continuous growth in the case of small deformations. The second one is designed for the solution of nonlinear problems in the case of finite deformations. It is based on the ideas of the theory of inhomogeneous solids and regards continuous growth as the limit case of discrete growth. The constitutive equations and boundary conditions for growing solids are presented. Non-classical boundary value problems are formulated. Methods for solving these problems are proposed.

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Singh, Dilbag, and P. Venkateswara Rao. "Selection of Optimal Tool Geometry and Cutting Conditions Using a Surface Roughness Prediction Model for Hard Turning." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-66116.

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Due to technical and economical factors, hard turning is competing successfully with the grinding process in the industries. However, due to the large number of variables and their interactions affecting the hard turning process, the process control becomes complex. So, the selection of optimal machining conditions for good surface quality, in hard turning, is of great concern in the manufacturing industries these days. In the present work, experimental investigation has been conducted to study the effect of the tool geometry (effective rake angle and nose radius) and cutting conditions (cutting speed and feed) on the surface roughness during the hard turning of the bearing steel with mixed ceramic inserts. Central composite design was employed for experimentation. The first and the second order mathematical models were developed in terms of machining parameters by using the Response Surface Methodology (RSM) on the basis of the experimental results. Results show that all the factors and their interactions were significantly influencing the surface roughness. Analysis of Variance (ANOVA) indicated that the second order surface roughness model was significant. Further, the surface roughness prediction model has been optimized by using genetic algorithms (GA). The genetic algorithm program gives minimum values of surface roughness and their respective optimal machining conditions (cutting conditions and tool geometry).

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