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Development of a cryogenic condenser and computation of its heat transfer efficiency based on liquefaction of nitrogen gas

required cold in the inside slots of the condenser. The refrigerant gas must have its normal condensation point below that of the gas being liquefied. The present article highlights the development of a cryogenic condenser in detail and its efficiency testing methodology in-situ by placing it in the Cryogenerator for liquefying nitrogen. 2 Material and Methods 2.1 Material selection Materials should be prudently selected for any cryogenic application as there can be extreme changes in the properties of the material being used when exposed to low temperature

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Finite element model updating using Lagrange interpolation

more interesting because not only they correct the model, but also they express these corrections by parameters. The majority of direct methods are developed at the end of the 1970s and the beginning of the 1980s. Thanks to their advantage, these methods are always used and have witnessed major developments. The first developed methods used Lagrange multiplier constraints in the minimization of cost functions [ 1 , 2 , 3 ]. Other methods called error matrix methods [ 4 , 5 ] are used to estimate directly the errors on the mass and stiffness matrices, and inverse

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New Cyber-mixmechatronic Concept for the Realization of Smart Cybernetic Systems with Applications in the Industry, Economy and Society

.scientific.net/AMM.332.145 [8] Machado, Jose; Soares, Filomena; Leao, Celina P.; et al., A Virtual Workbench Applied to Automation: Student’s Response Analysis, Controlo’2014 – Proceedings of the 11 th Portuguese Conference on Automatic Control Vol: 321, Pages 709-719, Published: 2015, Times Cited: 0; DOI:10.1007/978-3-319-10380-8_68; [9] Machado, J.; Campos, J. C.; Sevcik, L; et al., Development of Dependable Controllers in The Context of Machines Design, Modern Methods of Construction Design, Pages:125 - 131, Published: 2014, DOI: 10

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Studies Regarding the Reaction Method to Wear Braking Mechanism

and Materials Engineering Dept., Ankara: pp. 225-233. [6] Omar Maluf, Maurício Angeloni, Marcelo Tadeu Milan, Dirceu Spinelli, Waldek Wladimir Bose Filho (2007) Development of materials for automotive disc brakes, Minerva, 4(2): 149-158. [7] Adam Polak, Janusz Grzybek (2005) The mechanism of changes in the surface layer of grey cast iron automotive brake disc, Materials Research, Vol. 8, No. 4: 475-479. [8] Cueva G, Sinatora A, Guesser WL, Tschiptschin AP (2003) Case study, Wear resistance of cast irons used in brake

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Mechanical Properties of Ferritic Martenstic Steels: A Review

REFERENCES [1] Smith, R., Fast reactor progress—slow but sure, Progress in Nuclear Energy. 1987, vol. 20, 2, pp. 71-88. [2] Kittel, J., Frost, B., Mustelier, J., Bagley, K., Crittenden, G., and Van Dievoet, J., History of fast reactor fuel development, Journal of nuclear materials. 1993, vol. 204, pp. 1-13. [3] Klueh, R., and Nelson, A., Ferritic/martensitic steels for next-generation reactors, Journal of Nuclear Materials. 2007, vol. 371, 1-3, pp. 37-52. [4] Raj, B., and Vijayalakshmi, M., Ferritic steels and advanced ferritic

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Special Concrete with Polymers

Abstract

The development of polymeric materials offers new perspectives of science and technology due to their outstanding properties. These properties are obtained either due to the effect of dispersion polymers and their polymerization either due to their intervention in structure formation. They were prepared epoxy resin polymer concrete, Portland cement, coarse and fine aggregate and to evaluate the influence of resin dosage on microstructures and density of such structures reinforced concrete mixtures. The paper detailing the raw materials used in experimental works and structural properties of concrete studied.

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Methods of Determining Sock Values and the Distance Between Axes of the Gearboxteething Using a Fitted Tooth Engagement

Abstract

There are several constructive variants of devices built for complex control of engagement on both sides aimed at controlling both internal and external shocks, all of which featuring a standard wheel compound. By the method of forced tooth engagement fitted between the standard wheel and the measuring wheel and using the spectral analysis, constructive errors of the gear wheels can be quickly determined, especially those consisting in shocks and the variation of the distance between the axes, errors that severely impact on operation. At the National Institute of Research and Development in Mechatronics and Measurement Technique was developed a device used to control shock values and the distance between the axis of the gearboxes (for four of the gearbox speeds) by means of forced engagement and complex harmonic analysis.

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Tribological Behavior of AA7050-ZrSiO4 Composites Synthesized by Stir Casting Technique

Abstract

This research made an attempt to synthesize aluminum metal matrix composites through stir casting technique. The matrix material chosen in this study was AA7050 and the reinforcement material was ZrSiO4. The composites AA7050, AA7050-10%ZrSiO4, and AA7050-15%ZrSiO4 were used. The wear behavior of the aluminum matrix composites was investigated by using pin-on-disc tribometer. The advanced material has substantial development in tribological behavior when the reinforcement percentage is increased. From the experimental results, it was confirmed that sliding distance of 1200 m, applied load of 3 N and sliding speed of 2 m/s result in minimum wear loss and coefficient of friction, while adding 10%ZrSiO4 to the AA7050.

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Experimental Results of Vibroacoustic Diagnosis Performed with Vibro-Expert System

Abstract

The implementation of proactive maintenance is a necessity required by the development of modern technologies for the monitoring and exploitation of energy facilities and equipment. An important advantage of proactive maintenance is to permanently monitor the technical condition of the plant and equipment by vibration measurements and in the correct diagnosis in order to reasonably plan the required repairs. Turbo-aggregates are autonomous complex installations for producing electricity in refineries that operate in high power and high-speed modes. To monitor and control turbine vibrations, vibration sensors (uniaxial, biaxial and triaxial accelerometers) and proximity sensors (for relative displacements and lasers) are columned on bearing housings that transmit signals to data acquisition and processing systems as well is the Vibro-Expret diagnosis system presented in this paper.

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