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Guzel Muhammed Huseyin Unal Recep Emre Onder Ahmet Sen Muhammed Arif Kose Faruk 《Journal of Mechanical Science and Technology》2021,35(3):1301-1308
Journal of Mechanical Science and Technology - The energy demand of world is increasing worldwide because of increasing population and developing technology. The use of environmentally friendly... 相似文献
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Guzel Muhammed Huseyin Unal Recep Emre Kose Faruk 《Journal of Mechanical Science and Technology》2021,35(12):5773-5779
Journal of Mechanical Science and Technology - Solar chimney power plants (SCPP) are structures that have the potential to generate a significant amount of electrical energy without harming the... 相似文献
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In this study, the composites of diglycidyl ether of bisphenol A (DGEBA) epoxy resin that have been formed by mixing epoxy resin with allyl glycidyl ether (AGE) and 2,3‐epoxypropyl methacrylate [glycidyl methacrylate (GMA)] were prepared in weight % ratios of 90 : 10, 80 : 20, and 70 : 30. A computer controlled analyzer with 35 MHz and a digital oscilloscope with 60 MHz were used for measuring the velocities of ultrasonic wave. The measurement of ultrasonic velocity carried out by pulse echo method at frequencies of 2.25 and 3.5 MHz at room temperature. The values of acoustic impedance (Z), Poisson ratio (μ), and coefficients of elasticity (L, G, K, E) of composites were calculated by values of densities and velocities that obtained. Thus, the effect of modificating epoxy resin (DGEBA) by AGE and GMA on mechanical properties of DGEBA was investigated using the ultrasonic method. Atomic force microscopy has been used for determining the microstructure of composites. By the results obtained from the investigation, it have been established that the longitudinal and shear ultrasonic wave velocities, and the values of all the elasticity constants of DGEBA were increased by modification with AGE and GMA. Also the most suitable combination ratio for the compound of DGEBA : AGE and DGEBA : GMA has been found as 80 : 20. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013 相似文献
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I. G. Khisameev A. G. Safiullin Ya. Z. Guzel’baev A. V. Andrianov É. V. Suslikov V. A. Futin 《Chemical and Petroleum Engineering》2007,43(7-8):481-484
An experimental test unit is created for studying low-consumption stages of centrifugal compressors with a rotor magnetic
suspension system (MSS) and a torsional moment transducer. In addition, this unit makes it possible to perform MSS studies
in the area of functional construction, analysis and synthesis of dynamic characteristics of the rotor-MSS system. The rotation
speed of the model rotor is 1000–25000 rpm. In order to reduce the loss of power in bearings, a rotor magnetic suspension
device is used, developed and manufactured in the V. B. Shnepp Turbocompressor Research Institute. The torsional moment transducer,
installed in a coupling between the set-up gear and the bearing support, provides the possibility of measuring power in the
impeller shaft with compression of the working gas.
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Translated from Khimicheskoe i Neftegazovoe Mashinostroenie, No. 8, pp. 41–43, August, 2007. 相似文献
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It is noted that one of the most promising trends in the field of detecting turbocompressor stall and revelation of the signs that characterize different forms of the development of gas dynamic instability (stall and rotating surge) is the use of statistical processing methods and signals. A procedure is presented for using statistical functions for analyzing the nonstationary nature of compression in turbocompressors and revelation of signs of stall based on calculating covariation of signals of regime parameters. Results are provided for studies based on analyzing covariation of the signals of regime parameters for centrifugal compressors of different construction that demonstrate the suitability of this parameter for detecting the phenomenon of compression gas dynamic instability. The procedure proposed is used successfully in practice in the form of special software for stall signalers used in centrifugal compressor automation systems. 相似文献
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Ya. Z. Guzel’baev A. L. Khavkin I. G. Khisameev 《Chemical and Petroleum Engineering》2006,42(5-6):320-326
Systems for prevention of surging of centrifugal compressors and methods of rotating stall detection and early surge diagnosis
using statistical processing of sensor signals of various parameters, i.e., the method of calculation of the correlation function
of the signal and the method of calculation of signal dispersion, are discussed. The results of routine tests of air and high-speed
air centrifugal compressors and their detachable flow parts are adduced.
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Translated from Khimicheskoe i Neftegazovoe Mashinostroenie, No. 6, pp. 30–33, June, 2006. 相似文献
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Increasing productivity in sculpture surface machining via off-line piecewise variable feedrate scheduling based on the force system model 总被引:5,自引:2,他引:5
Sculpture surface machining is a critical process commonly used in various industries such as the automobile, aerospace, die/mold industries. Since there is a lack of scientific tools in practical process planning stages, feedrates for CNC machining are selected based on the trial errors and previous experiences. In the selections of the process parameters, production-planning engineers are conservative in order to avoid undesirable results such as chipping, cutter breakage or over-cut due to excessive cutter deflection. Currently, commonly used CAD/CAM programs use only the geometric and volumetric analysis, but not the physics of the processes, and rely on experience based cutting tool database and users’ inputs for selection of the process parameters such as feed and speed. Usually, the feeds and cutting speeds are set individual constant values all along the roughing, semi-finishing, and finishing processes. Being too conservative and setting feedrate constant all along the tool path in machining of sculpture surfaces can be quite costly for the manufacturers. However, a force model based on the physics of the cutting process will be greatly beneficial for varying the feedrate piecewise along the tool path.The model presented here is the first stage in order to integrate the physics of the ball-end milling process into the selection of the feeds during the sculpture surface machining. Therefore, in this paper, an enhanced mathematical model is presented for the prediction of cutting force system in ball end milling of sculpture surfaces. This physical force model is used for selecting varying and ‘appropriate’ feed values along the tool path in order to decrease the cycle time in sculpture surface machining. The model is tested under various machining conditions, and some of the results are also presented in the paper. 相似文献