Bibliografie tematiche / Machinery

Letteratura scientifica selezionata sul tema "Machinery"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 7 settembre 2023

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Articoli di riviste sul tema "Machinery"

1

Smolyak, Sergey A. "Valuation of Machines with a Random Service Life Based on the System of National Accounts – 2008". Economics of Contemporary Russia, n. 2 (5 luglio 2021): 40–57. http://dx.doi.org/10.33293/1609-1442-2021-2(93)-40-57.

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We propose a mathematical model describing the decrease in the market value of machines (depreciation) with age in a situation where its service life is random and has a Weibull distribution. We measure the depreciation of a used machinery item using a goodness factor, that is, the ratio of its value to the value of a similar new machinery item. The model is based on the principle of anticipation of benefits adopted in the valuation theory and the discounting cash flows method. The model takes into account that machine’s technical and economic characteristics deteriorate with age and its benefits are reduced according to the hyperbolic dependence adopted in the system of national accounts SNA‑2008. We have built the dependences of average machine's goodness factor on its relative age (the ratio of the actual age to the average service life). Calculations show that the discount rate and average service life have little effect on these dependencies. This made it possible to divide the machines into three categories and propose for each of them its own dependence of the goodness factor on the relative age, which is convenient for practical use in appraisal activities.
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Usubamatov, R., e R. Bhuvenesh. "Method of Assessing the Number of Technicians in Service of Manufacturing System". Journal for Manufacturing Science and Production 15, n. 3 (15 settembre 2015): 243–48. http://dx.doi.org/10.1515/jmsp-2015-0005.

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AbstractProductivity rate of manufacturing systems depends on technology, reliability of machinery, management, etc. The main attribute of machine’s reliability, which is availability plays important role for determination of the number of technicians that support the workability of the multi-stations the manufacturing system. The random downtimes of the productive machines have probabilistic nature. Failures of machines can coincide that lead to increasing downtimes and decreasing output of machinery. Practically, a technician conducts repairs of failures for one machine, but at the same time other failed machines can be in downtime until the failed machine in servicing. This situation leads to increase idle time of machines and hence a manufacturing system. How many machines should be in service by one technician is typical problem for industries. The proposed paper is represented the mathematical method with probabilistic approach for determining the number of technicians for servicing the manufacturing systems with minimum downtimes.
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Kumar, M. Sarath, e B. S. Prabhu. "Rotating Machinery Predictive Maintenance Through Expert System". International Journal of Rotating Machinery 6, n. 5 (2000): 363–73. http://dx.doi.org/10.1155/s1023621x00000348.

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Abstract (sommario):
Modern rotating machines such as turbomachines, either produce or absorb huge amount of power. Some of the common applications are: steam turbine-generator and gas turbine-compressor-generator trains produce power and machines, such as pumps, centrifugal compressors, motors, generators, machine tool spindles, etc., are being used in industrial applications. Condition-based maintenance of rotating machinery is a common practice where the machine's condition is monitored constantly, so that timely maintenance can be done. Since modern machines are complex and the amount of data to be interpreted is huge, we need precise and fast methods in order to arrive at the best recommendations to prevent catastrophic failure and to prolong the life of the equipment. In the present work using vibration characteristics of a rotor-bearing system, the condition of a rotating machinery (electrical rotor) is predicted using an off-line expert system. The analysis of the problem is carried out in an Object Oriented Programming (OOP) framework using the finite element method. The expert system which is also developed in an OOP paradigm gives the type of the malfunctions, suggestions and recommendations. The system is implemented in C++.
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Huo, Yuewen, Songlin Ye, Zhou Wu, Fusuo Zhang e Guohua Mi. "Barriers to the Development of Agricultural Mechanization in the North and Northeast China Plains: A Farmer Survey". Agriculture 12, n. 2 (17 febbraio 2022): 287. http://dx.doi.org/10.3390/agriculture12020287.

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Agricultural mechanization is essential to increase farmers’ income in modern agriculture. However, the use of machinery for crop production in China is quite inefficient. To understand the obstacles limiting farmers’ use of machinery, we conducted face-to-face interview surveys with 1023 farmers (including cooperative directors, machine operators, and farmers without machines) in two major cereal-producing regions with large differences in farming scale: the North China Plain (2.7 ha per capita) and the Northeast China Plain (12.8 ha per capita). The results revealed that farmers in both regions had strong will to use machines. The obstacle preventing farmers from buying machines was the lack of machinery training in the Northeast China Plain and land fragmentation in the North China Plain. Among different farmer groups, land fragmentation was the main barrier for cooperative directors. Farmers without machines thought that there was lack of machinery training and that the cost of machinery purchase was high. Machine operators believed that machine maintenance was too expensive. The income and age also had an effect on the different groups of farmer. It is concluded that, to improve mechanization efficiency and stimulate farmers’ intention to use machinery, the government should make policies to encourage the merge of fragmented farmlands, provide targeted subsidies for agricultural machinery, and organize machinery training in an efficient way.
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Cox, Patrick. "The Child Mechanical and Adult Anxiety in Children’s Literature and Culture: “Wheels to the Rails!”". Jeunesse: Young People, Texts, Cultures 8, n. 2 (dicembre 2016): 19–35. http://dx.doi.org/10.3138/jeunesse.8.2.19.

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This article examines previous studies of anthropomorphized machinery in children’s literature and posits that paying particular attention to machinery specifically anthropomorphized as children yields insightful analytic results. Earlier studies have suggested anthropomorphized machinery softens large machines and renders them less threatening. The author argues that pedomorphized machines (machines given not just human, but specifically children’s characteristics) should be studied not for what new meanings they bring to the machines, but for new meanings they bring to the construct of childhood. Rather than humanizing the machine, pedomorphic machinery blends childhood innocence and traits of James Kincaid’s “Child Botanical” with ideas of power, mobility, and freedom. These images reveal a deep unease with the coupling of childhood and technology.
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Grega, Robert, Jaroslav Homišin, Silvia Medvecká-Beňová e Jozef Krajňák. "Experimental Identification of Failures of High-Pressure Pump Drive". Applied Mechanics and Materials 816 (novembre 2015): 421–25. http://dx.doi.org/10.4028/www.scientific.net/amm.816.421.

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In practice, the mobile machines, machinery and their parts are sources of vibrations which could shorten their technical working life. In every machine, a specific energy is converted into vibrations of the machinery or their individual components. The information about machinery is fundamental condition of its future running. The methods of vibration diagnostic could be useful for monitoring of device wear and determining of real state of machines.
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Gałęzia, Tomasz. "Time usage and efficiency of machinery during stump crushing". Forest Research Papers 78, n. 4 (1 dicembre 2017): 271–76. http://dx.doi.org/10.1515/frp-2017-0030.

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Abstract This study was carried out at a roadside landing of the Augustów Forest District in order to determine the structure of a typical working day for machines involved in stump crushing as well as the overall efficiency of the process and the machinery's fuel consumption. The machines involved in the entire process were a front-loader, a shredder, a screen and a truck-tractor unit. Machinery activity was recorded using a sampling method with a three-minute interval. During 16 hours of observation, 533 stumps were crushed to produce 362 m3 lv of timber particles in total and the average operational productivity reached 28 m3 lv h−1. Based on the amount of consumed fuel and its energy content, the energy input of the process was calculated to be 103.33 MJ m−3 lv which is 3640.53 MJ m−3 lv less than the output of energy gained at the power plant. Total CO2 emissions of the processing machinery and transport off the forest site were estimated using previously published data and amounted to 7.58 kg m−3 lv.
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Jankovic, Ivan, Stevan Djenadic, Dragan Ignjatovic, Predrag Jovancic, Tomislav Subaranovic e Ivica Ristovic. "Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining". Energies 12, n. 12 (12 giugno 2019): 2245. http://dx.doi.org/10.3390/en12122245.

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In a continuous system of production in open-cast coal mining, in addition to the basic machinery which consists of highly productive machines (bucket-wheel excavators, bucket-chain excavators, spreaders, conveyor-belt transporters, etc.) that provide an uninterrupted exploitation of mineral ores, the usage of auxiliary machinery is also necessary. The auxiliary machinery provides the possibility of using the capacities of basic machinery adequately and timely. Further, it must be mentioned that the auxiliary machinery generates up to 20% of the total mining expenses. Dozers are the most commonly used machines. Choosing the adequate dozer of the right type and manufacturer is of great importance and can be made easier by carrying out an analysis of the existent operational-exploitative parameters. In this paper, the method of grading the operational-exploitative parameters of dozer is defined. The choice of the optimal type of dozer was conducted by using the analytical hierarchy process (AHP).
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Hrušková, Erika. "Relative Term of Capacity Computations and Manufacturing System Design". Applied Mechanics and Materials 474 (gennaio 2014): 55–60. http://dx.doi.org/10.4028/www.scientific.net/amm.474.55.

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Machinery production main aim is to produce the asked products according to parameters and properties defined by costumers. For production of these components is needed the specific machinery consisted the machines, tools and fixtures. Mutual influence of these articles makes possible the production of asked components. That is a reason, why is necessary to specify particular machines that participate in production of these components. The determination of current machines number is very difficult and time consuming. For design is needed to weigh all factors joined to manufacturing process. It means inside and outside company factors influenced to manufacturing process. Lots of these factors influence extensively, concrete the speed, quality and elaborateness of particular products. According to that is necessary to use the accurate methods and the computations for machines determination in machinery.
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Kolchin, N. N., N. V. Byshov, S. N. Borychev, I. A. Uspenskiy e G. K. Rembalovich. "Principal trends of development of high-performance potato growing machinery". Traktory i sel hozmashiny 79, n. 4 (15 aprile 2012): 46–51. http://dx.doi.org/10.17816/0321-4443-69419.

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Brief information on the importance of potatoes in the world is given. Principal trends in the development of agricultural machinery for the Smart Farming technologies are shown. Structural features of planting, harvesting and other special machines for potatoes including the machines intended for Smart Farming technologies are considered. The current trends of development of agricultural machinery are briefly presented.
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Tesi sul tema "Machinery"

1

Herman, Paul Andrew. "Improvement of surface finish quality in peripheral milling VIA precision compensation for cutter runout". Thesis, Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/16696.

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KöÅ, er Hür 1976. "Development of magnetic induction machines for micro turbo machinery". Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/8119.

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Abstract (sommario):
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
Includes bibliographical references.
This thesis presents the nonlinear analysis, design, fabrication, and testing of an axial-gap magnetic induction micro machine, which is a two-phase planar motor in which the rotor is suspended above the stator via mechanical springs, or tethers. The micro motor is fabricated from thick layers of electroplated NiFe and copper, by our collaborators at Georgia Institute of Technology. The rotor and the stator cores are 4 mm in diameter each, and the entire motor is about 2 mm thick. During fabrication, SU-8 epoxy is used as a structural mold material for the electroplated cores. The tethers are designed to be compliant in the azimuthal direction, while preventing axial deflections and maintaining a constant air gap. This enables accurate measurements of deflections within the rotor plane via a computer microvision system. The small scale of the magnetic induction micro machine, in conjunction with the good thermal contact between its electroplated stator layers, ensures an isothermal device which can be cooled very effectively. Current densities over 109 A/m2 simultaneously through each phase is repeatedly achieved during experiments; this density is over two orders of magnitude larger than what can be achieved in conventional macro-scale machines. More than 5 Nm of torque is obtained for an air gap of about 5 zm, making this micro motor the highest torque density micro-scale magnetic machine to date. About 0.3 buNm for the large air gap of 70 m is also achieved in systematic tests that reveal the influence of strong eddy-currents and associated nonlinear saturation within the micro motor.
(cont.) Eddy-current effects are modeled using a finite-difference vector potential formulation. Its results demonstrate the presence of flux crowding on the stator surface, which leads to heavy saturation. To capture saturation effects, a fully nonlinear finite-difference time-domain simulation is developed to solve Maxwell's Equations within the computational space of the micro machine. To mitigate the inherent stiffness in the partial differential equations, the speed of light is artificially reduced by five orders of magnitude, taking special care that assumptions of magnetoquasistatic behavior are still met. The results from this model are in very good agreement with experimental data from the tethered magnetic induction micro motor.
by Hür Köşer.
Ph.D.
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3

Tombs, George 1956. "Man the machine : a history of a metaphor from Leonardo da Vinci to H. G. Wells". Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=84203.

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Abstract (sommario):
During the Italian Renaissance, artists and anatomists compared man to various mechanical devices, in an attempt to uncover knowledge about the structure and processes of the human body. In so doing, they drew on ancient Greek notions of instrumentality and proportion. During the early Scientific Revolution, the metaphor of Man the machine played a key role in the development of mechanistic philosophy. During the Enlightenment, it served views on materialism and atheism. By the nineteenth century, when the Industrial Revolution was in full swing, a fundamental change in the relationship of man to machine had come about. Whereas, for Protagoras, man had been the measure of all things, now suddenly the machine was the standard by which the capacities and limits of man were judged. Man the machine was a key feature in the development of the totalitarian ideology of Communism. Moreover, for over a century now, the technocratic viewpoint has guided many technological innovations. Tracing a history of this metaphor, through Leonardo, Vesalius, Harvey, Descartes, Hobbes, Leibniz, La Mettrie, d'Holbach, Marx and Wells, places man's relationship with technology and his gradual loss of identity since the Renaissance in a new context.
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Moss, T. R. "Rotating machinery reliability". Thesis, Loughborough University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311046.

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Udovychenko, N. M. "Machinery vibration diagnostics". Thesis, Сумський державний університет, 2013. http://essuir.sumdu.edu.ua/handle/123456789/33874.

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Vibration is a process that can not be measured, unlike its parameters. The machine can have high levels of vibration for three reasons: – there is a strong source of vibration inside the machine; – during spreading between source of vibration and the point of observation, vibration weakly damped or even increases due to good conductivity and transparency of the surrounding structures; – there are two previous reasons simultaneously. For solving the first problem we have to explore the physical nature of vibration inside the machine. For solving the second problem it's necessary to investigate the spread of vibrations out of the construction. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/33874
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Filla, Reno. "Operator and Machine Models for Dynamic Simulation of Construction Machinery". Licentiate thesis, Linköping : Linköpings universitet, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-4092.

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Kivistö-Rahnasto, Jouni. "Machine safety design : an approach fulfilling European safety requirements /". Espoo [Finland] : Technical Research Centre of Finland, 2000. http://www.vtt.fi/inf/pdf/publications/2000/P411.pdf.

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Angola, Enrique. "Novelty Detection Of Machinery Using A Non-Parametric Machine Learning Approach". ScholarWorks @ UVM, 2018. https://scholarworks.uvm.edu/graddis/923.

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A novelty detection algorithm inspired by human audio pattern recognition is conceptualized and experimentally tested. This anomaly detection technique can be used to monitor the health of a machine or could also be coupled with a current state of the art system to enhance its fault detection capabilities. Time-domain data obtained from a microphone is processed by applying a short-time FFT, which returns time-frequency patterns. Such patterns are fed to a machine learning algorithm, which is designed to detect novel signals and identify windows in the frequency domain where such novelties occur. The algorithm presented in this paper uses one-dimensional kernel density estimation for different frequency bins. This process eliminates the need for data dimension reduction algorithms. The method of "pseudo-likelihood cross validation" is used to find an independent optimal kernel bandwidth for each frequency bin. Metrics such as the "Individual Node Relative Difference" and "Total Novelty Score" are presented in this work, and used to assess the degree of novelty of a new signal. Experimental datasets containing synthetic and real novelties are used to illustrate and test the novelty detection algorithm. Novelties are successfully detected in all experiments. The presented novelty detection technique could greatly enhance the performance of current state-of-the art condition monitoring systems, or could also be used as a stand-alone system.
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Seaman, Matthew N. J. "Targeting machinery for adaptors". Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339587.

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Fenney, Lee. "Flexible high speed machinery". Thesis, Aston University, 1989. http://publications.aston.ac.uk/11882/.

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The thesis describes an investigation into methods for the design of flexible high-speed product processing machinery, consisting of independent electromechanically actuated machine functions which operate under software coordination and control. An analysis is made of the elements of traditionally designed cam-actuated, mechanically coupled machinery, so that the operational functions and principal performance limitations of the separate machine elements may be identified. These are then used to define the requirements for independent actuators machinery, with a discussion of how this type of design approach is more suited to modern manufacturing trends. A distributed machine controller topology is developed which is a hybrid of hierarchical and pipeline control. An analysis is made, with the aid of dynamic simulation modelling, which confirms the suitability of the controller for flexible machinery control. The simulations include complex models of multiple independent actuators systems, which enable product flow and failure analyses to be performed. An analysis is made of high performance brushless d.c. servomotors and their suitability for actuating machine motions is assessed. Procedures are developed for the selection of brushless servomotors for intermittent machine motions. An experimental rig is described which has enabled the actuation and control methods developed to be implemented. With reference to this, an evaluation is made of the suitability of the machine design method and a discussion is given of the developments which are necessary for operational independent actuators machinery to be attained.
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Libri sul tema "Machinery"

1

Farm machinery. Oxford: BSP Professional, 1992.

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Culpin, Claude. Farm machinery. Oxford, England: Blackwell Scientific, 1992.

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Culpin, Claude. Farm machinery. Oxford: BSP Professional Books, 1987.

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Farm machinery. London: Collins, 1986.

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5

Sharon, Rudnitski, Birenbaum Rhonda, Canada. Agriculture Canada. Research Branch. e UMA Engineering Ltd, a cura di. Handling agricultural materials: Air and pneumatic conveyors. Ottawa, Ont: Research Branch, Agriculture Canada, 1989.

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6

Big diggers. New York: Cavendish Square Publishing, 2015.

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7

E, St Andre Ralph. Simple machines made simple. Englewood, Colo: Teacher Ideas Press, 1993.

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8

Graham, Thompson. Diggers and loaders. London: Macdonald, 1985.

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Diggers & loaders. Milwaukee: G. Stevens Pub., 1986.

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Electric machinery. Englewood Cliffs, N.J: Prentice-Hall, 1988.

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Capitoli di libri sul tema "Machinery"

1

Lafitte, François. "Machinery". In Origins of the Welfare State V5, I_75—I_77. London: Routledge, 2021. http://dx.doi.org/10.4324/9781003101611-9.

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Teuscher, Christof. "Intelligent Machinery". In Turing’s Connectionism, 17–62. London: Springer London, 2002. http://dx.doi.org/10.1007/978-1-4471-0161-1_2.

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Naboni, Roberto, e Ingrid Paoletti. "Advanced Machinery". In Advanced Customization in Architectural Design and Construction, 29–75. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04423-1_3.

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Bringsjord, Selmer. "Our Machinery". In What Robots Can and Can’t Be, 58–96. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2464-5_2.

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Hastings, M. J. "MAP machinery". In Principles and Applications of Modified Atmosphere Packaging of Foods, 39–62. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-6097-5_3.

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Grierson, W., A. F. G. Smith, Frank Thornton e Gavriel Felsenstein. "Packingline Machinery". In Fresh Citrus Fruits, 287–313. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4684-8792-3_12.

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Deocaris, Custer C., Sunil C. Kaul e Renu Wadhwa. "Mortalin’s Machinery". In Mortalin Biology: Life, Stress and Death, 21–30. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-3027-4_2.

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Song, Hongqing. "Fluid Machinery". In Engineering Fluid Mechanics, 199–208. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0173-5_7.

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Szabó, Sándor. "The machinery". In Texts and Readings in Mathematics, 78–118. Gurgaon: Hindustan Book Agency, 2004. http://dx.doi.org/10.1007/978-93-86279-22-4_3.

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Czichos, Horst, e Karl-Heinz Habig. "Machinery Diagnostics". In Tribologie-Handbuch, 664–91. Wiesbaden: Vieweg+Teubner, 2010. http://dx.doi.org/10.1007/978-3-8348-9660-5_22.

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Atti di convegni sul tema "Machinery"

1

Al-ani, M. M. J., S. P. Lee e J. M. Allport. "Integrated Electrical Machine-Turbo Machinery". In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63429.

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Abstract (sommario):
Global warming and climate change due to rising levels of greenhouse gases have placed significant pressure on the automobile industry to adopt more clean fuel, transportation electrification, and waste energy recovery technologies. As a result, several electrically assisted or driven turbo-machines have been proposed such as turbochargers, turbo-compressors, and electrical boosters. Therefore, the electrification of turbo-machinery has been trending for the past decade. All the systems mentioned above consist of a conventional electrical machine connected to the turbo-machinery by a shaft, making the system relatively large, heavy, costly and mechanically complex. In this paper, an integrated electrical machine-turbo machinery concept is proposed. It consists of an electrical machine mounted around a salient rotor that is shaped like an axial flow turbo-machinery wheel. The electrical machine can be used as a motor to drive or assist the operation of the turbo-machine or it can operate as a generator powered by the gas or fluid flow. Compared to the conventional electrically derived or assisted turbo-machine systems, the proposed system is expected to decrease the overall size, weight and complexity. In order to illustrate this concept, an initial multi-physics feasibility study is presented. Electromagnetic and mechanical, performance are calculated and investigated using FEA. Additionally, aerodynamic consideration has been illustrated.
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Bacon, David F. "Session details: Machine machinery". In OOPSLA05: ACM SIGPLAN Object Oriented Programming Systems and Applications Conference. New York, NY, USA: ACM, 2005. http://dx.doi.org/10.1145/3244455.

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Morita, Masao. "Vibration Analysis on the Rotating Machinery". In ASME 2005 Power Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pwr2005-50361.

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The paper presents vibration analysis on the boiler feed water pump in thermal power plants. In the Tokyo Electric Power Company (TEPCO), mechanical vibration diagnosis of rotating machinery has been carried out, and got good results. However, in some cases, abnormal condition of machine at an initial stage couldn’t specify, or a machine’s life didn’t predict, because of diagnosing only by tendency of vibration severity. Mechanical vibration diagnoses are typical diagnosing method on the operating condition of the rotating machines, which are well known as one of the Condition Based Maintenance (CBM). It has already been established theoretically, however the actual activities of the vibration diagnosis are required special experiences, especially for the prediction of abnormal condition of rotating machine such as imbalance, and misalignment, and also prediction of bearing failures, etc., These diagnostics have been used for about 30 years in various fields of industries. Therefore, both of the condition survey such as tendency management of vibration severity and condition analysis such as frequency analysis and wave analysis, by using vibrometers, are applied for several power plants of the TEPCO.
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Sundararajan, V., Andrew Redfern, Michael Schneider, Paul Wright e James Evans. "Wireless Sensor Networks for Machinery Monitoring". In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82224.

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Wireless sensor networks (WSNs) are currently been actively investigated in the research community on account of their unprecedented spatial density of sensors, local computational plus storage capacity, and potential for distributed and fault-tolerant monitoring. Today, they are mainly deployed for environmental monitoring - e.g. for “smart building” control, water quality monitoring, and botanical studies. In the future, it is clear they have a huge potential for industrial applications such as machinery monitoring, shop instrumentation, and process control. Wireless sensor nodes can be mounted on various parts of machinery and plant to promote early fault detection and analysis. Their small size and autonomy enables their placement in locations that are usually difficult to access. In addition, it is also possible, with minimal changes to the machine configuration, to deploy sensors on the machinery after it has been installed. The sensor nodes cannot only monitor their own output but also collaborate with neighboring nodes to determine the health of the overall machines and provide early warnings of potential failure. We study, in this paper, the benefits of using wireless sensor networks in machine tools and plant equipment. We discuss the uses of these networks and the issues that must be addressed in order for these implementations to be successful. We also present two case studies for machinery and machine too monitoring.
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Walker, R. B., S. Perinpanayagam e I. K. Jennions. "Localizing Unbalance Faults in Rotating Machinery". In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94455.

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Excessive levels of unbalance in rotating machinery continue to contribute to machine downtime and unscheduled and costly maintenance actions. Whilst unbalance as a rotordynamic fault has been studied in great detail during the last century, the localization of unbalance within a complex rotating machine is today often performed in practice using little more than ‘rules of thumb’. In this work, localizing excessive unbalance has been studied from an experimental perspective through the use of two rotordynamic test rigs fitted with multiple disks. Sub-synchronous non-linear features in the frequency domain have been identified and studied as a method of aiding the localization of unbalance faults, particularly in situations where sensor placement options are limited. The results of the study are discussed from the perspective of next-generation Integrated Vehicle Health Management (IVHM) systems for rotating machines.
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6

Greenhill, Lyn M., e Linda F. Raven. "Damped Vibration Absorbers Applied to Lateral Modes of Rotating Machinery". In ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/vib-8292.

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Abstract Damped vibration absorbers can significantly reduce the amplitude of resonant motion. Normally, these devices are used on machinery that is non-rotating (stationary). However, as this paper demonstrates both analytically and experimentally, a damped absorber can be successfully applied on rotating equipment, particularly on vertical machines, to attenuate lateral resonances. To illustrate this application, a detailed analysis of the damped absorber is presented, focusing on mass ratio, tuning frequency, amount of damping, and speed effects. It is shown that an optimum design can be obtained for use on a rotating machine that parametrically differs from a non-rotating application. Test data is also given illustrating the effectiveness of the concept and design methodology on an actual machine. Recommendations are provided to guide the application of this technology on other rotating machines.
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7

Kumar, M. Sarath, e B. S. Prabhu. "Object Oriented Programming and Expert Systems in Rotating Machinery". In ASME 1997 Turbo Asia Conference. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-aa-125.

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In any rotating machinery, unbalance and misalignment of the rotor are the two major malfunctions. Perfect alignment of shafts never exists. Improper aligning of shafts through couplings often leads to severe vibration problems in many rotating machines. In the present work effect of flexible coupling misalignment on lateral vibrational characteristics of a rotor-bearing system has been studied in an Object Oriented Programming framework using finite element method. An off-line rule based expert system has been developed for condition monitoring of a gas turbine, which predicts the machine condition severity and the cause of the problem. The system is implemented in C++.
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Ivantysyn, Roman, e Jürgen Weber. "Novel Open Circuit Displacement Control Architecture in Heavy Machinery". In 8th FPNI Ph.D Symposium on Fluid Power. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fpni2014-7806.

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Motivated by the ever-stricter demands by lawmakers to lower emissions of mobile machinery and increasing fuel prices, mobile machinery has gone through a paradigm shift. Fuel efficiency has become a major selling point of machine producers. Even the heavy machinery branch, which is mainly dominated by reliability, productivity and serviceability, has started to feel this change. Hydraulic systems of large scale, as can be found in mining excavators, have typically been based on simplicity and durability. Typical architectures are open-center hydraulic systems, which were designed with robustness and productivity in mind; however they lack competiveness with other hydraulic systems in terms of energy efficiency. Displacement control has shown promising potential especially in multi-actuator machines such as excavators. The technology has so far been demonstrated in closed circuit applications on small-scale machines (below 30 t). Large scale excavators however should in general be more suitable for displacement control due to their relatively small hydraulic component cost compared to the machine and operating cost, larger energy recovery potential due to larger mass movement, more flexibility in space management and greater hydraulic power installed. Large machines feature already several smaller pumps instead of a single large pump, which is important with respect to the fact that displacement control is based on one pump per actuator. A challenge for displacement control on large-scale machinery is handling their high volumetric flow-demands on the system. Today many large excavators feature a float valve, which short-circuits the cylinder chambers and ensures rapid lowering of the attachment under aiding load. Float valves ensure fast cycle times and are essential for high productivity, however incorporating this feature in displacement control is a challenge, especially in closed circuit systems. Open circuit displacement control systems have greater flexibility than closed circuit solutions in working with float-valves and dealing with the high volumetric flows. Additionally the open circuit architecture is ideal for pump-flow-sharing, the strategy to connect two or more pumps with one actuator, which can be practiced when not all actuators move at the same time. This paper compares displacement control in open circuit form with valve-controlled actuation in a mining excavator and shows several fuel saving potentials. The Open Center system was simulated and results were validated with measurements. The proposed open circuit displacement control solutions are implemented virtually and replace the valve-controlled system. Components and system-architecture were carefully chosen in order to ensure reliability, minimal component changes and redundancy that compare to the robustness of today’s system.
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Rasnic, Russ, e Joe A. Capps. "Machine Guarding, Lockout/Tagout, and the Interlocked Guard". In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60445.

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Unguarded or poorly guarded machinery claims many limbs and lives each year. Similarly, injuries from machinery undergoing maintenance and/or cleaning operations are far too numerous. Machine guarding and related machinery violations continue to rank in the top 10 in OSHA citations. The lists of types of machines and their associated hazards, as well as the types of injuries are too lengthy to mention. Maximizing the effectiveness of safeguards is essential for protecting workers from preventable injuries. One of the most effective means of machinery guarding is the interlocking guard, which is a device that shuts off or disables a machine function when a guard or cover is removed or opened. Interlocking guards are an important component of guarding safety. Often, an interlocked guard is the only type of guard that can be used. This paper presents several scenarios where the interlocking guard was the best available technology for handling the hazard. Interlocks are a rapidly developing field. The advantages and drawbacks of interlocks are discussed, as well as the different types of interlocks available.
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Harker, Roger G. "Understanding Machinery Management — Using Machine Condition and Process Information for Maximum Benefit". In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0059.

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The use of machinery protection systems is well-established in industry. These systems shut down a machine or return it to a safe or nondestructive mode of operation without human intervention. Protection systems are used to ensure personnel safety, prevent or minimize machine damage, and limit environmental impact. While these are substantial benefits, machinery protection remains inherently reactive, and the approach is still necessary, but no longer sufficient in today’s economic environment. Machinery management is increasingly recognized for its ability to indicate machinery condition before a protection system’s alarm levels are exceeded. By providing an early warning of what is happening with the machine, proactive decisions can be made about how machinery assets are run and how they affect the plant. Machinery management requires the correlation of critical process data with vibration and position data. It allows event correlation and effective root cause analysis. Information resulting from effective machinery management is actionable because it results from continuous online audits of machinery, and indicates when action is required and how best to take it. Machinery management helps answer key questions, such as: How long can this machine run? Can the process be adjusted to extend the operation and avoid a shutdown? If you want to proactively manage machinery and optimize machinery performance along with the process, you must have an effective machinery management program. This paper explores the practice of machinery management, including what it is, what is considered “best practice,” and what the resulting benefits are.
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Rapporti di organizzazioni sul tema "Machinery"

1

Dupont, Pierre E. Design Methods for Machinery Emulators. Fort Belvoir, VA: Defense Technical Information Center, febbraio 2004. http://dx.doi.org/10.21236/ada421133.

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Thomas, Douglas S., e Brian A. Weiss. Economics of manufacturing machinery maintenance:. Gaithersburg, MD: National Institute of Standards and Technology, giugno 2020. http://dx.doi.org/10.6028/nist.ams.100-34.

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3

Srajer, V., M. Heximer e W. Veldhuis. Notes on stripping machinery mass estimates. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/304952.

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4

none,. Machinery Footprint, December 2010 (MECS 2006). Office of Scientific and Technical Information (OSTI), giugno 2010. http://dx.doi.org/10.2172/1218601.

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Rains, Dean A., e John A. Johnson. Naval Ship Affordability Through Machinery Modularity. Fort Belvoir, VA: Defense Technical Information Center, novembre 1993. http://dx.doi.org/10.21236/ada455156.

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Farley, John P., e Frederick W. Williams. Water Mist Machinery Space Fire Doctrine. Fort Belvoir, VA: Defense Technical Information Center, gennaio 2004. http://dx.doi.org/10.21236/ada419993.

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Bhattarai, Madhusudan, Gajendra Singh, Hiroyuki Takeshima e Ravindra S. Shekhawat. Farm machinery use and the agricultural machinery industries in India: Status, evolution, implications, and lessons learned. Washington, DC: International Food Policy Research Institute, 2020. http://dx.doi.org/10.2499/9780896293809_03.

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Wilson, David. Repair Machinery for Radiation-Induced DNA Damage. Fort Belvoir, VA: Defense Technical Information Center, luglio 2001. http://dx.doi.org/10.21236/ada396847.

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9

Author, Not Given. Advanced power electronics and electric machinery program. Office of Scientific and Technical Information (OSTI), dicembre 2007. http://dx.doi.org/10.2172/1216752.

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Thompson, Lawrence H. Repair Machinery for Radiation-Induced DNA Damage. Fort Belvoir, VA: Defense Technical Information Center, luglio 2002. http://dx.doi.org/10.21236/ada407373.

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