Bibliografie tematiche / Machinery

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Letteratura scientifica selezionata sul tema "Machinery"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 1 agosto 2024

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Articoli di riviste sul tema "Machinery"

1

Smolyak, S. A. "The Poisson process of machinery degradation: Application to valuation". Journal of the New Economic Association 48, n. 4 (2020): 63–84. http://dx.doi.org/10.31737/2221-2264-2020-48-4-3.

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Abstract (sommario):
The machinery degradation process is described by a random process in which failures occur with constant intensity, and with each failure the rate of benefits generated by the machinery item reduces by a random amount. If the machinery item begins to generate negative benefits, it is subject to decommissioning. We get explicit expressions for the average life of the machinery items and the coefficient of variation of the service life. Machine’s value is determined by discounting the flow of benefits from its future use. This allows to link this value with the rate of benefits that the machinery item brings. In cases where there is no information on the amount of such benefits, appraisers rely on the machine’s age. However, different machinery items of the same age may be found in a different condition and therefore are characterized by different values. We offer formulas for calculating the percent good factors reflecting the average decrease in the equipment’s value with age. To take into account the effects of income tax, property tax and inflation, it suffices to adjust the discount rate in the constructed model. It has been verified that the proposed dependencies are in a fairly good agreement with market price data for two different types of construction equipment.
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2

Akram, Muhammad Waqar, Nida Akram, Hongshu Wang, Shahla Andleeb, Khalil Ur Rehman, Umair Kashif e Syed Farhaan Hassan. "Socioeconomics Determinants to Adopt Agricultural Machinery for Sustainable Organic Farming in Pakistan: A Multinomial Probit Model". Sustainability 12, n. 23 (24 novembre 2020): 9806. http://dx.doi.org/10.3390/su12239806.

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Urbanization and low productivity are real threats to the sustainability of organic farming. The adoption of farm machinery plays a vital role in overcoming these threats to ensure a sustainable and more profitable organic farming model. Farm machinery can also increase farmland yield and reduce the need for labor, although the requirement of significant capital investment often prevents small farmers from buying machinery. There is an increased need to comprehend all relevant elements associated with farming machinery procurement and service delivery. In this article, we provide insight into the impact of different variables of farmers on the adoption of agricultural equipment. A total of 301 organic farmers were surveyed in three districts of Punjab, Pakistan. It was found that the most common machinery concerned herein are tube-well/pumps, tractors, tillage machinery, and thrashers/harvesters. Results from a multinomial probit estimation showed that farm machinery ownership is positively correlated with capital assets, civil infrastructure, alternative sources of power, and credit facility. The findings indicated that policymakers and stakeholders should not concentrate merely on short term planning, such as improving agricultural machinery’s adoption rate. Still, they should also strive to upgrade physical infrastructure and facilities and provide credit services to create an enabling environment that can empower the citizen in adopting large scale use of agricultural machinery for long term sustainability of organic farming.
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3

Liao, W. Z., e Y. Wang. "Dynamic Predictive Maintenance Model Based on Data-Driven Machinery Prognostics Approach". Applied Mechanics and Materials 143-144 (dicembre 2011): 901–6. http://dx.doi.org/10.4028/www.scientific.net/amm.143-144.901.

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As an increasing number of manufacturers realize the importance of adopting new maintenance technologies to enable systems to achieve near-zero downtime, machinery prognostics which enables this paradigm shift from traditional fail-and-fix maintenance to a predict-and-prevent paradigm has arose interests from researchers. Machine's condition and degradation estimated by machinery prognostics approach can be used to support predictive maintenance policy. This paper develops a novel data-driven machine prognostics approach to assess machine's health condition and predict machine degradation. With this prognostics information, a predictive maintenance model is constructed to decide machine's maintenance threshold and predictive maintenance cycles number. Through a case study, this predictive maintenance model is verified, and the computational results show that this proposed model is efficient and practical.
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4

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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Abstract (sommario):
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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Wang, Li, Yi Qi Zhou e Zhen Hua Wang. "CFD Research on Aerodynamic Performance of Complicated Resistance Muffler". Applied Mechanics and Materials 34-35 (ottobre 2010): 1274–78. http://dx.doi.org/10.4028/www.scientific.net/amm.34-35.1274.

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In this paper, a complicated resistance muffler was designed for a construction machinery. Computational Fluid Dynamics (CFD) method with three dimension models was used to explore the aerodynamic performance of the muffler. With this method the pressure distribution in the muffler is simulated and the pressure loss is predicted for the structure modification. The experiment results verify that the assembly performance of the muffler modified is better than the original muffler. The pressure loss and the insert loss of the improved muffler meet the design specifications and standards of the construction machinary. The integrated performance of the construction machinery has been advanced.
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MU, Hongyun, Yanlei LUO e Yu LUO. "Electro-Hydraulic Load-Sensitive Simulation Study of Walking Hy-draulic System of Electric Agricultural Machinery". Mechanics 28, n. 6 (5 dicembre 2022): 481–89. http://dx.doi.org/10.5755/j02.mech.31470.

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Abstract (sommario):
The conventional load-sensitive hydraulic drive chassis system for agricultural machinery uses a combination of engine and load-sensitive pump, which cannot adjust the control strategy according to the working conditions. It does not meet the current trend of energy-saving and emission reduction. To this end, an electro-hydraulic load-sensitive hydraulic drive chassis system for agricultural machinery, which uses a combination of permanent magnet synchronous motor and quantitative pump, is proposed. A variable LS differential pressure control and a variable differential pressure control of the pressure compensation valve to improve agricultural machinery's working performance are proposed. AMESim is used to establish the system simulation model to obtain the system composite motion, variable LS differential pressure control, and variable pressure differential control of the pressure compensation valve performance. The simulation results show that the system achieves the essential functions of a conventional load-sensitive system. The variable LS differential pressure control and the variable pressure differential control of the pressure compensation valve are feasible. They can effectively improve the performance of agricultural machinery to adapt to working conditions. It can effectively reduce the system energy consumption and provide a theoretical basis for the intellectualization of electric agricultural machinery.
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Polishchuk, Viktor, e Timur Valiev. "Study of the anaerobic destruction of post-alcohol distillery waste by mateen". Naukovij žurnal «Tehnìka ta energetika» 14, n. 2 (31 marzo 2023): 60–69. http://dx.doi.org/10.31548/machinery/2.2023.60.

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Post-alcohol distillery waste is an environmental pollutant, which determined the relevance of its disposal. One of the ways to utilise post-alcohol distillery waste is through its anaerobic methane destruction in biogas plants. The research aims to determine the optimal amount of post-alcohol distillery wastes to be added to the substrate to achieve maximum biomethane yield. The research was conducted on a laboratory biogas plant consisting of a 30-litre digester and a gas holder in a mesophilic mode at a substrate temperature of 40°C with a periodic substrate loading mode. It was found that the highest biogas yield of 5.369 l/(h×kg DOM) was obtained by anaerobic methane mono-degradation of post-alcohol distillery waste. However, the methane content in the biogas is in the range of 48-52%. During the anaerobic methane destruction of a mixture of post-alcohol distillery waste with cow manure, the methane content in biogas increases to 70-76%, but the biogas yield is lower and is 4.577 l/(h×kg DOM) at 36% post-alcohol distillery waste content in the substrate, 3.294 l/(h×kg DOM) at 27%, 2.960 l/(h×kg DOM) at 18%, 1.538 l/(h×kg DOM) at 9%. The optimum content of post-alcohol distillery waste in the substrate, at which the biomethane yield will be maximum (3.821 l/(h×kg DOM)), is 46.7% of the substrate content and 100% of the organic part of the substrate. The results of this study can be used in planning the composition of the substrate of biogas plants and designing and building new biogas plants near distilleries
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Nykyforova, Larysa, Nikolay Kiktev, Taras Lendiel, Sergey Pavlov e Pavel Mazurchuk. "Computer-integrated control system for electrophysical methods of increasing plant productivity". Naukovij žurnal «Tehnìka ta energetika» 14, n. 2 (2 aprile 2023): 34–45. http://dx.doi.org/10.31548/machinery/2.2023.34.

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Сhervinsky, Leonid, Oleksandr Savoiskyi e Viktor Sirenko. "The influence of ultrasonic processing on the structure and electrophysical properties of fruit in combined drying". Naukovij žurnal «Tehnìka ta energetika» 14, n. 2 (3 aprile 2023): 70–79. http://dx.doi.org/10.31548/machinery/2.2023.70.

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Abstract (sommario):
The intensification of ultrasonic vibrations for the processing of agricultural products is becoming increasingly important in the food industry, as it can reduce energy consumption for the dehydration of raw materials. The research aims to study the effect of sonication on the change of electrophysical parameters and structure of apple raw materials in the process of combined drying using direct electric heating. Using scanning electron microscopy, images of the surface structure of dried apple samples were obtained at different combinations of sonication duration and methods of heat supply to the raw material during the drying process. Based on the experimental studies, the dependences of the current flowing through the sample in the process of combined drying using direct electric heating on the duration of raw material processing in an ultrasonic bath were obtained. The influence of preliminary sonication on the maximum values of the current strength during direct electric heating was determined. The dependences of changes in the resistivity of apple samples during dehydration at different pretreatment durations were investigated. The effect of ultrasound on the initial resistivity of apples, the duration of electro-plasmolysis, and the resistivity values at which the maximum values of the direct electric heating current are observed were determined. The results of the experiments show that the pretreatment of raw materials in an ultrasonic bath can reduce the peak current values by up to 27%. The initial values of the resistivity of the raw material after sonication are reduced by 7.8-13.8% compared to the control samples. The obtained images of the dried fruit surfaces showed an increase in the porosity and roughness of the samples. The obtained results of experimental studies can become a prerequisite for the development of an energy-efficient technical means of ultrasonic processing of fruit and vegetable raw materials before drying and the selection of optimal operating modes
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Mudryk, Krzysztof, Taras Hutsol, Mykola Zablodskiy, Dmytro Sorokin e Serhii Usenko. "A study of electrothermomechanical converter for technological purposes with nonlinear changes in the loading and cooling medium". Naukovij žurnal «Tehnìka ta energetika» 14, n. 2 (22 marzo 2023): 9–22. http://dx.doi.org/10.31548/machinery/2.2023.09.

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Heavy temperature processes with high-temperature loads require optimisation of technological processes, ensuring high reliability and combining rotating parts of electric machines with actuators to achieve greater efficiency of electromechanical converters. The research aims to provide a theoretical justification and experimental confirmation of the effect of higher harmonics in the air gap under nonlinear changes in the temperature of the medium. The research is based on the basic principles of electrodynamics, heat and mass transfer, mathematical modelling by the finite element method, and experimental verification of multi-physical parameters. Based on the analysis of the differential equation for determining the increase in the surface temperature of a ferromagnetic rotor under conditions of nonlinear temperature changes in the environment surrounding the electromechanical converter, the regularities of the formation of the free and forced components of the instantaneous temperature values of the massive rotor are established. Depending on the mode of interaction between the load-cooling medium and the electromechanical part of the screw units, kinematic diagrams of single-mass and two-mass systems with variable or constant moments of inertia and stiffness were formed. According to the size of the electromagnetic system of the experimental sample, a mathematical model for studying thermal and electromagnetic processes was built. The regularities of the spatial distribution of the temperature of the screw electromechanical unit are determined. The spectra of higher harmonics of voltage and current in the frequency range from 0 to 50 kHz have been experimentally determined, which confirms the presence of the effect of generating higher harmonics when the temperature of the medium surrounding the rotor screw changes. The detected harmonic spectrum affects both the formation of the dynamics of the rotating system and additional thermal power while increasing the overall efficiency of the screw electromechanical converter. The practical value of the obtained results lies in the possibility of predicting the optimal indicators of interrelated electromagnetic and heat exchange processes in screw electromechanical converters for technological purposes
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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

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

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

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3

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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4

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

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Norton, Robert L. Design of machinery: An introduction to the synthesis and analysis of mechanisms and machines. Boston, Mass: McGraw-Hill, 1999.

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6

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

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Sykes, Greg. Operating Baumfolders. Sidney, Ohio: Baumfolder Corp., 1987.

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8

1949-, Stilgoe John R., e Beeck Nathalie op de, a cura di. Little machinery: A critical facsimile edition. Detroit: Wayne State University Press, 2009.

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Fitzgerald, A. E. Electric machinery. 5a ed. New York: McGraw-Hill, 1990.

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Fitzgerald, A. E. Electric machinery. 5a ed. London: McGraw Hill, 1992.

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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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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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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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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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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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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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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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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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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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