Journal articles: 'Machine pistols'

1

Thomas, Zach. "Sex Pistols: Poison in the Machine." Rock Music Studies 5, no. 3 (September 2, 2018): 309–11. http://dx.doi.org/10.1080/19401159.2018.1519901.

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Giverts, P. "HOMEMADE FIREARMS PRODUCED USING THE 3D PRINTING METHOD – THEIR CONSTRUCTION AND THE PECULIARITIES OF FORENSIC EXAMINATION." Criminalistics and Forensics, no. 65 (May 18, 2020): 381–92. http://dx.doi.org/10.33994/kndise.2020.65.37.

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The development of a new technology of material processing known as 3D printing in 2013 lead to posting on the Internet blueprints of the first pistol made with the use this technology. The pistol got the name Liberator. Within the first two days after the post, the blueprints of this pistol were downloaded more than a hundred thousand times. The difference of this construction from other constructions is that all the parts, except the firing pin, are printed on the 3D printer. For manufacturing this type of pistols special equipment (which has become easily available lately) is needed, as well as the knowledge and skill to operate it. At the same time, no special knowledge about the development and manufacturing of firearms is necessary. Availability of ready blueprints (the programs for printing the elements in 3D printer) without the need to do manual or machine treatment, lead to the wide spread of this type of homemade firearms. The law enforcements of many countries have already got cases of illegal trafficking of homemade firearms made with the use of 3D printing technology. The article discusses the construction features of Liberator pistol, as well as the peculiarities of its forensic examination. Special attention is paid to the problem of reliability and durability of this type of pistols. The possibility of damage or destruction of the pistol construction during a shot was investigated. The influence of different parameters, such as the size of the pistol, the material of its elements, the caliber of the cartridge on the possible destruction of the pistol, was also discussed. The damages in the pistols, made of different polymers, were illustrated in this article by the results of investigations taken from a few foreign professional sources. The problem of establishing the fact of a shot, which had been made from pistol printed in 3D printer, before the evidence came for forensic examination, was discussed. The article deals with the problem of the influence of this shot on the possibility of determination of the constriction durability and with the question if the evidence meets the criteria of firearms. Possible defects in the examined evidences, which should be checked be the examiners before the experimental shot, were pointed out.

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Fraser, K. C. "Handguns: Semi‐automatic Pistols and Revolvers and Sub‐machine Guns97319James Marchington. Handguns: Semi‐automatic Pistols and Revolvers and Sub‐machine Guns. London: Brassey’s 1997. 126 pp, ISBN: 1 85753 163 9 £15.95 Brassey’s Modern Military Equipment Series." Reference Reviews 11, no. 5 (May 1997): 42–43. http://dx.doi.org/10.1108/rr.1997.11.5.42.319.

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Ernst, Meike, Andrea Vacca, Monika Ivantysynova, and Georg Enevoldsen. "Tailoring the Bore Surfaces of Water Hydraulic Axial Piston Machines to Piston Tilt and Deformation." Energies 13, no. 22 (November 17, 2020): 5997. http://dx.doi.org/10.3390/en13225997.

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A novel virtual prototyping algorithm has been developed to design one of the most critical lubricating interfaces in axial piston machines of the swash plate type—the piston–cylinder interface—for operation with water as the working fluid. Due to its low viscosity, the use of water as a lubricant can cause solid friction and wear in these machines at challenging operating conditions. The prototyping algorithm compensates for this by tailoring the shape of the bore surface that guides the motion of each piston in this type of positive displacement machine to conform with the piston surface, taking into account both the piston’s tilt and its deformation. Shaping these surfaces in this manner can render the interface more conducive to generating hydrodynamic pressure buildup that raises its load-carrying capacity. The present work first outlines the structure of the proposed algorithm, then presents a case study in which it is employed to design a bore surface shape for use with two prototypes, one virtual and one physical—both modified versions of a 444 cc commercial axial piston pump. Experimental testing of the physical prototype shows it to achieve a significantly higher maximum total efficiency than the stock unit.

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Wang, Gui Tang, and Mei Ling Yu. "Pistol Ring Gap Inspection under Free State Based on Machine Vision." Applied Mechanics and Materials 328 (June 2013): 198–202. http://dx.doi.org/10.4028/www.scientific.net/amm.328.198.

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The traditional way is to put the ring into the standard ring gauge to inspect, but the process of this kind of method is complex, high cost and slow. The study has put forward a detection method based on machine vision technology for pistol ring under free state as the existing defects in inspecting ring gap. Pistol ring is imaged under free conditions. Edge detection technologies, sub-pixel and Gaussian filter, have been effectively adopted to extract the contour of pistol ring. Then perform curve fitting in section to work out the gap length of each segment when pistol is circle. From the experiment, methods in this study are pertinent to the number of the segments. Proper segments can ensure gap length can be rightly calculated out when meeting the required accuracy. Sub-pixel edge detection is proposed in the application of piston ring detection in this study, and it improved the previous algorithm toimprove the efficiency ,reduced the process complexity, saved the cost.

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Hu, Shu Lan. "On Piston Rod System Operation Analysis and Piston Structure Optimization Research." Applied Mechanics and Materials 513-517 (February 2014): 4147–51. http://dx.doi.org/10.4028/www.scientific.net/amm.513-517.4147.

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The transmission components of internal combustion engine power are piston rod structure. The quality of the structure design has direct impact on the whole machine. Alternating thermal load and mechanical load are pistons, which are under the worst piston rod system working condition. This article performs operation analysis piston rod structure through the corresponding application of Pro/Mechanica and Pro/Mechanism, so that the stress and piston dangerous stress concentration location shall be determined based on piston structure optimization design. This way leads to quality improvement of piston rod structure design, leading to extended products service life, which has a particularly important role and significance.

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Shcherba, V. E., A. S. Tegzhanov, E. Y. Nosov, A. M. Paramonov, V. N. Blinov, and S. F. Khrapskii. "Comparative Analysis of Mass-Dimensional A Comparative Analysis of Mass-Dimensional Indicators of Crossheadless and Crosshead Piston Hybrid Energy Positive Displacement Machines." Proceedings of Higher Educational Institutions. Маchine Building, no. 9 (714) (September 2019): 88–95. http://dx.doi.org/10.18698/0536-1044-2019-9-88-95.

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Currently, one of the main ways to improve the efficiency of piston compressors and volumetric pumps is to combine them into a single unit, called a piston hybrid energy machine. Recently, a new class of crossheadless piston hybrid energy positive displacement machines has appeared. In this work, a comparison of mass-dimensional indicators of experimental crosshead and crossheadless hybrid energy machines is performed. The analysis of the results shows that the crossheadless machine has significantly smaller masses of moving parts performing reciprocating motion (almost 3 times) and a smaller maximal overall size (almost 1.5 times) in comparison to the crosshead machine. The specific mass-dimensional indicators of the two machines are comparable.

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LaRocco, John, and Dong-Guk Paeng. "A functional analysis of two 3D-scanned antique pistols from New Zealand." Virtual Archaeology Review 11, no. 22 (January 28, 2020): 85. http://dx.doi.org/10.4995/var.2020.12676.

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Preservation of historical weapons requires continual and careful maintenance. Digital three-dimensional (3D) scanning can assist in preservation and analysis by generating a 3D computer model. New Zealand presents a special case for historical preservation, owing to the rapid import of European goods in a culture previously unexposed to metalworking. This, and the subsequent British colonization, led to upheaval and war. The most intense conflict between British and Maori forces was in the New Zealand Land Wars of the mid-19th century. The primary handheld firearms used in this period were black-powder muzzle-loaders, and the variety of armed factions involved in the war resulted in an eclectic range of weapons used. Two antique muzzle-loading pistols from this period were scanned and analyzed. Insights were gained into the history of double-barreled muzzle-loading pistols and transitional revolvers. The double-barreled pistol was determined to have been a flintlock pistol from a century prior to the Land Wars, later converted to percussion cap ignition. The transitional revolver was an intermediate step between the multi-barrel pepperbox pistol and the “true” revolver, but it remained in use throughout the Victorian era. Both types of firearms were effectively obsolete elsewhere in the world by the time of the Land Wars, but the conflict created a demand for a variety of weapons. While the pistols analyzed in this study are decommissioned and no longer in working order, the 3D models made from the samples afforded a unique glimpse into New Zealand’s history. The methodology detailed over the course of the study can be applied to other historical firearms in order to facilitate preservation, investigation, and experimentation.Highlights:<ul><li>Preservation of historical machines requires continual maintenance, including replacement of worn or missing parts.</li><li>A combination of 3D scanning and digital models was used to analyze two antique pistols from New Zealand: a converted flintlock pistol and a transitional revolver.</li><li>The method of making and analyzing digital models detailed in this study offers a way to facilitate historical preservation, experimental archaeology, and functional analysis.</li></ul>

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Aliemeke, B. N. G., and M. H. Oladeinde. "Design of 0.67hp gasoline generator pistons." Nigerian Journal of Technology 39, no. 3 (September 16, 2020): 839–43. http://dx.doi.org/10.4314/njt.v39i3.25.

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Piston is an important internal combustion engine component that works with other engine components to withstand severe stresses and high temperature that are generated in the combustion chambers. Pistons are subjected to a very high mechanical and thermal load which results from extreme pressure cycles and huge forces of inertia caused by extremely high acceleration during the reciprocating motion. The 0.67hp generator piston designed had the values of parameters to be: 51.00mm Piston stroke; 48.85mm piston bore diameter; 3.66kw brake power; 4.87kw indicated power; 11.63Nm engine torque; 3.22mm piston thickness and 9.44cm3 clearance volume. The piston parameter values calculated were found to be in accordance with the recommended range of values in the design and operating data for internal combustion engines. Keywords: Piston design, machine parameters and internal combustion engines.

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Shcherba, V. E., Nosov E.Y., A. S. Tegzhanov, A. M. Paramonov, V. N. Blinov, and V. I. Surikov. "An Experimental Study of a Crossheadless Piston Hybrid Power Positive Displacement Machine with Intensive Cooling of the Compressed Gas." Proceedings of Higher Educational Institutions. Маchine Building, no. 10 (715) (October 2019): 78–85. http://dx.doi.org/10.18698/0536-1044-2019-10-78-85.

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Piston hybrid power machines combining the functions of a compressor and a pump in one unit have become widespread, with a new class of machines that do not have a crosshead currently under development. A prototype of such a machine was designed and manufactured based on the new concept of a crossheadless piston hybrid power machine. A plan for conducting a series of experimental studies was developed. The experimental studies confirmed the feasibility of the prototype in the entire range of independent operating parameters (discharge pressure in the compressor section, discharge pressure in the pump section, the number of revolutions of the crankshaft). The effect of operating parameters on the instantaneous and integral characteristics of the compressor and the pump sections of the crossheadless piston hybrid power machine was also assessed through the experimental studies.

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11

Ma, Fukang, Shuanlu Zhang, Zhenfeng Zhao, and Yifang Wang. "Research on the Operating Characteristics of Hydraulic Free-Piston Engines: A Systematic Review and Meta-Analysis." Energies 14, no. 12 (June 14, 2021): 3530. http://dx.doi.org/10.3390/en14123530.

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The hydraulic free-piston engine (HFPE) is a kind of hybrid-powered machine which combines the reciprocating piston-type internal combustion engine and the plunger pump as a whole. In recent years, the HFPE has been investigated by a number of research groups worldwide due to its potential advantages of high efficiency, energy savings, reduced emissions and multi-fuel operation. Therefore, our study aimed to assess the operating characteristics, core questions and research progress of HFPEs via a systematic review and meta-analysis. We included operational control, starting characteristics, misfire characteristics, in-cylinder working processes and operating stability. We conducted the literature search using electronic databases. The research on HFPEs has mainly concentrated on four kinds of free-piston engine, according to piston arrangement form: single piston, dual pistons, opposed pistons and four-cylinder complex configuration. HFPE research in China is mainly conducted in Zhejiang University, Tianjin University, Jilin University and the Beijing Institute of Technology. In addition, in China, research has mainly focused on the in-cylinder combustion process while a piston is free by considering in-cylinder combustion machinery and piston dynamics. Regarding future research, it is very important that we solve the instabilities brought about by chance fluctuations in the combustion process, which will involve the hydraulic system’s efficiency, the cyclical variation, the method of predicting instability and the recovery after instability.

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12

Manring, Noah D. "Friction Forces Within the Cylinder Bores of Swash-Plate Type Axial-Piston Pumps and Motors." Journal of Dynamic Systems, Measurement, and Control 121, no. 3 (September 1, 1999): 531–37. http://dx.doi.org/10.1115/1.2802507.

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In this research, the friction within the cylinder bore of a swash-plate type axial-piston machine is examined. Unlike previous research, this work develops a mathematical model for the friction based upon lubricating conditions which are described by the well-known Stribeck curve. Furthermore, a test device is built for measuring the frictional characteristics during low pressure and low speed operation and these results are compared with the mathematical model. For high pressure and high speed considerations, a numerical investigation based upon the model is conducted and it is shown that the friction associated with a pumping piston is greater than the friction associated with a motoring piston. It is also shown that increased piston speeds usually reduce the friction within the cylinder bore; however, a “cross-over” condition may exist where the increased speed will actually increase the friction as a result of increased fluid shear. Furthermore, it is shown that speed changes have a more significant impact on motoring pistons as opposed to pumping pistons due to a difference in the location of hydrodynamic lubrication within the cylinder bore. It is noted that this difference exits due to the bore geometry and the direction of piston travel.

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13

Wei, Shi Yang, Guang Zhen Cheng, Zhe Tong, Jia Hang Ma, Yan Chun Gu, and Qi Feng You. "Structure Optimization Design about the Wet Grinding Sanding Machine with Double Cooling System." Applied Mechanics and Materials 685 (October 2014): 208–11. http://dx.doi.org/10.4028/www.scientific.net/amm.685.208.

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This paper introduced a wet grinding sanding machine, it is used for fine material. The machine was consists of three parts by stirring grated agencies, cooling system, material handling systems. Rotor and its Rod pin using the whole cast structure, low cost, conical rod pin to improve bending strength. Annular space between the cylinder and the cylinder liner formed cylinder cooling water channel, it connected respectively inlet and return pipes. Hollow spindle, inner pipe, pipe joint and rotor cavity form rotor cooling water channel, dual cooling effect is good. Shell fixed to the cylinder, turn the handle nut, interaction between the thread and the external thread on the piston, forces the pistons to axial movement, used to adjust the working volume and pressure of sanding machine.

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Mukmin, Muhammad Amirul. "ANALISIS KEANDALAN DAN PENENTUAN PERSEDIAAN OPTIMAL SUKU CADANG COMPRESOR TWO STAGE FOR VESSEL IQF DENGAN METODE ABC DAN RELIABILITY DI PT.KELOLA MINA LAUT." MATRIK (Jurnal Manajemen dan Teknik) 17, no. 1 (December 27, 2017): 38. http://dx.doi.org/10.30587/matrik.v17i1.161.

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The Production process PT. Kelola Mina Laut has often had obstacles of not working operation of production systems ( production stop because of the problem at bottleneck or breakdown ). This happens because the breakage production machine or waiting for engine unit/component ordered and purchased to replace the faulty component. Especially on machine compressor two-stage no 6 for vessel IQF 4 So it required that the optimal inventory control of spare parts. The method used for the determination this component is the ABC classification method and the method Reliability. ABC obtained by the method of classification of class A that is a component Cylinder liner, piston, piston ring, water pump cooling kop and oil pump. From research to get the value of reliability and the optimal amount of spare parts that cylinder liner with 0.005566 reliability value and the rate of failure 0.012. component piston with the reliability value of 0.017 and the rate of failure 0.014. component piston ring with the reliability value of 0.069 and the rate of failure 0.003605. Component water pumps cooling kop with reliability value of 0.04 and the rate of failure 0.001933 and component Oil Pump with reliability value of 0.03 and the rate of failure 0.002274. Component count is required in a year on machine compressor two-stage no 6 for vessel IQF 4 is 4 units Cylinder liner,5 units of pistons, 1 unit piston ring, 1 unit water pump cooling kop and 1 unit oil pump. With this research can save maintenance costs amounting to 29.86% by a margin price of Rp 37,506,700.00

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Maczyszyn, Agnieszka. "Energy Loss Coefficients ki in a Displacement Pump and Hydraulic Motor used in Hydrostatic Drives." Polish Maritime Research 26, no. 3 (September 1, 2019): 47–55. http://dx.doi.org/10.2478/pomr-2019-0045.

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Abstract The article aims at defining and analysing the energy loss coefficients in design solutions of rotating displacement machines, with a piston machine as an example. The energy losses observed in these machines include mechanical loss, volumetric loss, and pressure loss. The scale and relations between these losses in different machines depend on machine design and manufacturing quality, and on operating parameters. The operating parameters, in turn, which affect directly or indirectly the above losses depend on whether the machine works in pump or hydraulic motor regime. The article is also a contribution to the development of a library of ki coefficients which define the losses in displacement machines, as the knowledge about these coefficients makes it possible to assess fast and easily the energy efficiency of a machine or drive system at each point of its working area.

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Manring, Noah D., Viral S. Mehta, Frank J. Raab, and Kevin J. Graf. "The Shaft Torque of a Tandem Axial-Piston Pump." Journal of Dynamic Systems, Measurement, and Control 129, no. 3 (December 7, 2006): 367–71. http://dx.doi.org/10.1115/1.2719785.

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The objective of this study is to identify the best indexed position of two rotating groups within a tandem axial-piston pump for attenuating the torque ripple amplitude that is exerted on the shaft. By attenuating the torque ripple characteristics of the pump, other vibration aspects of the machine are also expected to be reduced. In particular, the objectives of this paper are aimed at reducing the noise that is generated by the pump. This paper begins by considering the theoretical torque ripple that is created by the discrete pumping elements of a single rotating group within an axial piston machine. From this analysis, an equation is produced that describes a single pulse for the torque ripple as a function of the average torque and the total number of pistons that are used within the rotating group. By superposing another rotating group on top of the first, and by indexing the angular position of one rotating group relative to the other, a second equation is produced for describing the theoretical torque ripple of a tandem pump design. This equation is also a function of the average shaft torque and the total number of pistons that are used within a single rotating group; however, an additional parameter known as the index angle also appears in this result. This index angle is shown to amplify or attenuate the amplitude of the torque ripple depending upon its value. From these results, it is shown that a proper selection of the index angle can reduce the torque ripple amplitude by as much as 75%.

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Pyrozhyshyn, R. "MERITS AND REMUNERATION OF EMPLOYEES OF REGIONAL AND CITY DIVISIONS OF NKGB-MSS IN THE TERNOPIL REGION, 1945-1948." Bulletin of Taras Shevchenko National University of Kyiv. History, no. 145 (2020): 70–79. http://dx.doi.org/10.17721/1728-2640.2020.145.12.

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The author of the article investigates the merits and remuneration of employees of the regional and city depatments of the NKGB-MSS in the Ternopil region in the 1945-1948 on the basis of a considerable circle of historical sources and monographs. The author identifies the main type of remuneration for NKGB-MSS employees - gratitude announcement. The author of the article indicates the main type of remuneration for NKGB-MSS employees - the announcement of gratitude, and the main merit was the successful participation in the chekist-military operation. It was considered successful if it resulted in the killing or detention of a person or a group of people involved in a particular case. Often during such operations, various trophies were taken, such as assault rifles, guns, pistols, machine guns, grenades and ammunition. However, internal documentation of the OUN or UPA was of the greatest operational value, since the documents served as the basis for the development of new operational cases. The author notes that NKGB-MSS security officers, their families, and agents received compensation. To substantiate this thesis, the author provides two examples. After the death of a security official, the family of the deceased received a lump sum compensation of 3,000 rubles. A security agent received 2,000 rubles for the reconstruction of the house and manor buildings because during the chekist-military operation, the rebels hid in her house and set it on fire, and not only the house but also the manor buildings. The author allocates arms and money as a reward to separate unit. The author emphasizes the receipt of the prize weapon for two reasons: firstly, as a rare event, and secondly, as irresponsible act of the state security officers, since the TT combat weapon was presented to a minor schoolboy who had joined the military unit. The author of the article emphasizes that most of the cash prize was received only by fighters of fighter battalions, recruited agents and cadets of militant squadron. They earned cash prizes for successfully conducted chekist-military operations.The author of the article also notes the amount of cash prizes was from 250 to 500 rubles. The amount of remuneration often varied depending on the rank and significance of each individual operation.

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Lisiak, Paweł, Izabela Rojek, and Paweł Twardowski. "Evaluating the Reliability of Groove Turning for Piston Rings in Combustion Engines with the Use of Neural Networks." Archives of Mechanical Technology and Materials 37, no. 1 (January 26, 2017): 35–40. http://dx.doi.org/10.1515/amtm-2017-0005.

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AbstractThe article describes a method of evaluating the reliability of groove turning for piston rings in combustion engines. Parameters representing the roughness of a machined surface, Ra and Rz, were selected for use in evaluation. At present, evaluation of surface roughness is performed manually by operators and recorded on measurement sheets. The authors studied a method for evaluation of the surface roughness parameters Ra and Rz using multi-layered perceptron with error back-propagation (MLP) and Kohonen neural networks. Many neural network models were developed, and the best of them were chosen on the basis of the effectiveness of measurement evaluation. Experiments were carried out on real data from a production company, obtained from several machine tools. In this way it becomes possible to assess machines in terms of the reliability evaluation of turning.

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Ткач, Михайло Романович, Борис Георгійович Тимошевський, Олександр Сергійович Митрофанов, Аркадій Юрійович Проскурін, and Юрій Миколайович Галинкін. "ПОКАЗНИКИ СІРКОВОДНЕВОЇ РОТОРНО-ПОРШНЕВОЇ РОЗШИРЮВАЛЬНОЇ МАШИНИ У СКЛАДІ ЕНЕРГОТЕХНОЛОГІЧНОЇ УСТАНОВКИ." Aerospace technic and technology, no. 8 (August 31, 2019): 5–9. http://dx.doi.org/10.32620/aktt.2019.8.01.

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The article discusses the efficiency of applying a 12RPE-4,4/1,75 rotary-piston engine as an expansion machine for a promising energy technology plant for the production of hydrogen sulfide from the depths of the Black Sea. In this installation, high-pressure hydrogen sulfide is used in the expansion machine to produce mechanical energy, which can ensure the operation of pumps and other equipment. 12RPE -4,4/1,75 is a 12-cylinder short-stroke engine with an S/D ratio of 0.4. A feature of the engine is that for the distribution of the working fluid are used inlet and outlet openings, the overlap of which is carried out by the central rotor. Thus, the central rotor performs the function of a slide valve and a housing in which the pistons move. The use of the spool distribution provides a simple and compact design. The pressure of hydrogen sulfide at the inlet to the rotary-piston expansion machine is determined in the range of pipeline immersion depths of 0...1000 m, at a temperature of 280 ... 285 K and gas content of hydrogen sulfide in seawater 0.0...10.0 m3/m3. The definition of the main parameters of the working fluid and the working process is performed for a daily production of seawater of 100 m3/day. It is calculated that for a gas content of 2.5 m3/m3 with a depth of immersion of the lifting pipeline H = 250...1000 m, the power of the expansion machine is 0.20...0.61 kW, for gas content 5 m3/m3 – 0.65...0.86 kW for gas content 7.5 m3/m3 – 1.20...1.87 kW, for gas content 10 m3/m3 – 1.65...2.55 kW. Indicator diagrams of the expansion machine operation depending on the gas content of hydrogen sulfide in seawater and the depth of immersion of the pipeline were obtained. It was determined that with an increase in pressure at the inlet, the effective efficiency of the hydrogen sulfide expansion machine lies within 0.21...0.49. Also, with an increase in inlet pressure, the specific effective consumption decreases from 51.5 to 25.17 kg/kWh. Low values of specific effective consumption of hydrogen sulfide and high values of effective efficiency are due to the design features of the rotary-piston expansion machine, which combines the advantages of the piston and rotary engines.

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El'hutov, Sergey, and Aleksandr Lavrik. "DETERMINING THE TECHNICAL CONDITION OF PISTON MACHINES BASED ON THE RESULTS OF MEASURING THE ANGULAR SPEED OF THE SHAFT." Modern Technologies and Scientific and Technological Progress 1, no. 1 (May 17, 2021): 151–52. http://dx.doi.org/10.36629/2686-9896-2021-1-1-151-152.

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A method for determining the technical condition of piston-type machines is pro posed. The method is based on measuring the deviations of the angular velocity of the piston machine shaft depending on the angle of its rotation. In order to test the efficiency of the proposed method, a prototype of a device for measuring the angular velocity of a shaft has been developed. Trial meas urements of the angular velocity of the rotating shaft were carried out.

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Sieniło, Maciej, Julia Skrzeszewska, and Marta Wiśniewska. "Software for visualisation and analysis of signals from devices for measurement of shape deviations." Mechanik 90, no. 11 (November 13, 2017): 1038–40. http://dx.doi.org/10.17814/mechanik.2017.11.173.

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The software developed at the Institute of Metrology and Biomedical Engineering is presented, which can be used for comparative analysis of rotary profiles of mechanical elements measured with FMM. The distinguishing feature of the software amongst solutions offered by the machine manufacturers is the ability to compare profiles recorded applying different measuring machines and at different times. In addition, the software allows to estimate the impact of the most important components of measurement uncertainty. As a result, it can be successfully used to evaluate the wear of mechanical components, such as motor pistons.

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Sauer and Kühl. "Experimental Investigation of Displacer Seal Geometry Effects in Stirling Cycle Machines." Energies 12, no. 21 (November 5, 2019): 4215. http://dx.doi.org/10.3390/en12214215.

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This contribution deals with an experimental investigation of the optimization potential of Stirling engines and similar regenerative machines by an enhanced design of the cylinder liner and the seal. The latter is mounted at the bottom end of the gap surrounding pistons and displacers that separate cylinder volumes at different temperature levels. The thermal loss associated with this gap may amount to more than 10% of the heat input into these machines. Mostly, its design is reduced to an estimation of the optimum width by analytical models, which usually do not account for further relevant optimization parameters, such as a step in the cylinder wall. However, a recently developed, enhanced analytical model predicts that this loss may be significantly reduced by such a step. In this work, this design was realized and investigated experimentally according to this prediction by modification of the cylinder liner and the seal of an extensively tested laboratory-scale machine. The results confirm that such a design actually reduces the thermal loss substantially, presumably by reducing the cyclic mass flows through the open end of the gap. Additionally, it even improves the net power output due to a reduced volumetric displacement by the piston or displacer, resulting in smaller flow losses and thermal regenerator losses, whereas the pressure amplitude remains virtually unchanged, contrary to initial expectations. This has led to the remarkable conclusion that the design of most Stirling engines is possibly suboptimal in this respect and may be improved a posteriori by a minor modification; i.e., a reduction of the effective displacer seal diameter.

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Asoyan, Arthur R., Alexander S. Gorshkov, and Ani H. Israelyan. "Less wear on the piston skirts of internal combustion engines." RUDN Journal of Engineering Researches 21, no. 3 (December 15, 2020): 175–80. http://dx.doi.org/10.22363/2312-8143-2020-21-3-175-180.

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A significant proportion of mechanical losses in internal combustion engines accounted for mechanical losses in the cylinder-piston group. Depending on the operating modes of the internal combustion engine, contact interaction in the piston-cylinder pair is possible, which leads to wear of the working surfaces of the resource-determining elements and a decrease in the operational life of the power unit as a whole, in connection with which the reduction of friction losses in the internal combustion engine elements and the piston - cylinder liner coupling in particular is relevant. Both domestic and foreign researchers are engaged in the solution of the above described problems, various profiles of pistons, methods of calculating the parameters of the oil layer are proposed, but the practical state of the issue determines the relevance of research in this direction. The paper considers the possibility of reducing the wear of piston skirts by reducing the contact surface in conjugation and providing an oil film in the friction zone, regardless of engine operating conditions. This opportunity is realized by forming a certain macro profile on the working surface of the piston skirt. The formation of the macrorelief was carried out by means of surface plastic deformation, with the reciprocating movement of a spherical tool on the machined surface.

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Wang, Jiabin. "Performance evaluation of fractional-slot tubular permanent magnet machines with low space harmonics." Archives of Electrical Engineering 64, no. 4 (December 1, 2015): 655–68. http://dx.doi.org/10.1515/aee-2015-0049.

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Abstract This paper evaluates the perforamnce of fractional-slot per pole winding configurations for tubular permanent magnet (PM) machines that can effectively eliminate the most undesirable space harmonics in a simple and cost-effective manner. The benefits of the proposed machine topology winding configurations are illustrated through comparison with 9-slot, 10-pole tubular PM machine developed for a free piston energy converter under the same specification and volumetric constraints. It has been shown that the proposed machine topology results in more than 7 times reduction in the eddy current loss in the mover magnets and supporting tube, and hence avoids potential problem of excessive mover temperature and risk of demagnetization.

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DZIOPA, Zbigniew, and Krzysztof ZDEB. "Dispersion Analysis of Rounds Fired from a Glauberyt Machine Pistol." Problems of Mechatronics Armament Aviation Safety Engineering 10, no. 1 (March 31, 2019): 121–34. http://dx.doi.org/10.5604/01.3001.0013.0801.

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Within an enclosed shooting range of the EMJOT company, the process of firing one hundred single bullets from a Glauberyt machine pistol was recorded. The empirical test used 9x19 mm FMJ Luger (Parabellum) ammunition manufactured in the Czech Republic in 2017. As the weapon is dedicated to special forces, the shots were fired by an anti-terrorist operative, at a target located 25 m away. In order to determine bullet dispersion, the results of the experiment were subjected to statistical processing. Mean displacement and mean square displacement relative to the mean hit point, histograms, normal distribution, as well as statistical tests and hypotheses were used for estimation. The shots were recorded with a high speed digital camera Phantom v 9.1. The videos recorded were used to determine the initial kinematic parameters of the bullet trajectory.

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Drogosz, Piotr. "DIFFERENT TYPES OF POWER TRANSFORMING MACHINES WITH ROTATING PISTONS." Journal of KONES. Powertrain and Transport 19, no. 1 (January 1, 2015): 79–82. http://dx.doi.org/10.5604/12314005.1137315.

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Dong, Yi, Jianmin Liu, Yanbin Liu, Huaying Li, Xiaoming Zhang, and Xuesong Hu. "Creep–Fatigue Experiment and Life Prediction Study of Piston 2A80 Aluminum Alloy." Materials 14, no. 6 (March 13, 2021): 1403. http://dx.doi.org/10.3390/ma14061403.

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In order to improve the reliability and service life of vehicle and diesel engine, the fatigue life prediction of the piston in a heavy diesel engine was studied by finite element analysis of piston, experiment data of aluminum alloy, fatigue life model based on energy dissipation criteria, and machine learning algorithm. First, the finite element method was used to calculate and analyze the temperature field, thermal stress field, and thermal–mechanical coupling stress field of the piston, and determine the area of heavy thermal and mechanical load that will affect the fatigue life of the piston. Second, based on the results of finite element calculation, the creep–fatigue experiment of 2A80 aluminum alloy was carried out, and the cyclic response characteristics of the material under different loading conditions were obtained. Third, the fatigue life prediction models based on energy dissipation criterion and twin support vector regression are proposed. Then, the accuracy of the two models was verified using experiment data. The results show that the model based on the twin support vector regression is more accurate for predicting the material properties of aluminum alloy. Based on the established life prediction model, the fatigue life of pistons under actual service conditions is predicted. The calculation results show that the minimum fatigue life of the piston under plain condition is 2113.60 h, and the fatigue life under 5000 m altitude condition is 1425.70 h.

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Ballardini, Roberto, Vincenzo Balzani, Alberto Credi, Maria Teresa Gandolfi, and Margherita Venturi. "Artificial molecular-level machines with[Ru(bpy)3]2+as a “light-fueled motor”." International Journal of Photoenergy 3, no. 2 (2001): 63–77. http://dx.doi.org/10.1155/s1110662x01000083.

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A molecular-level machine is an assembly of a discrete number of molecular components (that is, a supramolecular structure) designed to perform mechanical-like movements (output) as a consequence of appropriate external stimuli (input). Like macroscopic machines, molecular-level machines are characterized by (i) the kind of energy input supplied to make them work, (ii) the kind of movement performed by their components, (iii) the way in which their operation can be controlled and monitored, (iv) the possibility to repeat the operation at will and establish a cyclic process, (v) the time scale needed to complete a cycle of operation, and (vi) the function performed. The most convenient way to supply energy to an artificial molecular-level machine is through a photochemical reaction.[Ru(bpy)3]2+(bpy=2,2′-bipyridine) can be used as a photosensitizer to power mechanical movements in machines based on pseudorotaxanes, rotaxanes and catenanes. Besides being used as an external photosensitizer,[Ru(bpy)3]2+can be incorporated in one of the machine components as a “light-fueled” motor. Three types of photochemically driven piston/cylinder systems and a photocontrollable molecular abacus are described. Other kinds of more sophisticated molecular-level machines based on rotaxanes and catenanes are proposed. The extension of the concept of machine to the molecular level is important not only for the sake of basic research, but also for the growth of nanoscience and the development of nanotechnology.

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Wang, Ping Jiang, Xin Jie Fang, Hai Min Fan, and Ji Hong Chen. "The Research and Application of Piston Hydro-Pulse Test Machine." Applied Mechanics and Materials 401-403 (September 2013): 409–15. http://dx.doi.org/10.4028/www.scientific.net/amm.401-403.409.

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As an important part of an engine, piston is working for a long time in the environment of high temperature, high pressure and pulse-pounding. Its working state and life directly affect the life of the engine. Piston fatigue failure plays an important factor of piston failure. Piston hydro-pulse test machine has important significance for studying the life of piston mechanical fatigue. The paper is about the design and use effect of domestic piston hydro-pulse test machine. Practice shows that the control technology of Piston hydro-pulse test machine, fulfills various indicators of piston fatigue tests, and has important significance for improving domestic piston design, production and usage.

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Brett, L., J. Macnamara, P. Musch, and J. M. Simmie. "Simulation of methane autoignition in a rapid compression machine with creviced pistons." Combustion and Flame 124, no. 1-2 (January 2001): 326–29. http://dx.doi.org/10.1016/s0010-2180(00)00193-0.

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Jian, Zhang, Deng Lijun, Hao Guannan, and Liu Shiying. "Investigation of wear mechanism of forged steel piston skirt under boundary lubricated conditions." Industrial Lubrication and Tribology 70, no. 7 (September 10, 2018): 1303–9. http://dx.doi.org/10.1108/ilt-04-2017-0105.

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Purpose With the implementation of new emission standards, the thermal–mechanical coupling load of engine pistons becomes more important. In this case, forged steel material with higher fatigue limit and impact resistance has been applied gradually in piston manufacturing. However, new failure problems emerge, and the wear of skirt under boundary lubrication conditions is an essential problem which needs to be solved urgently. Design/methodology/approach In this research, the abrasion testing machine was used to simulate the wear behavior under different conditions of normal pressure, relative velocity and surface roughness. Besides, the wear morphology was observed by scanning electron microscope. Then, the wear model was established by using test results fitting method, offering a way to conduct qualitative analysis for the wear problem under the same conditions. Findings The results show that mainly the wear mechanism of the piston skirt under boundary lubricated conditions is adhesive wear and abrasive wear. In addition, the coefficient and wear rate will increase with the increase in the normal load and surface roughness and decrease with the increase in the relative speed. In the wear model, the wear loss is mainly influenced by the normal load, the relative sliding speed and the wear time. Originality/value The wear degree of piston skirt was qualitatively obtained in this investigation by factors such as pressure, velocity and so on, and the wear mechanism of forged steel piston skirt under boundary lubrication conditions was also determined. These could provide theoretical support for further optimization of cylinder motion and oil supply system, reduction of friction loss and power loss.

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Liu, Zhen Yong, Hong Qiang Sun, Shuan Liang Feng, and Mei Yang. "Electrical Control System Design of Automatic Piston Ring Chamfering Machine." Advanced Materials Research 490-495 (March 2012): 1095–98. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.1095.

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This paper describes the work Principle of the automatic piston ring chamfering machine，It describes detailed hardware, software design of electrical control system of the machine using MCU，The system realizes functions automaticly such as loading and unloading, piston ring’s plastic, piston ring’s pressure tight, piston ring’s chamfer, stopping short positions alarm, fault alarm, and the communication between the device and host computer.

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Mittal, Gaurav, and Mickael Chomier. "Interpretation of experimental data from rapid compression machines without creviced pistons." Combustion and Flame 161, no. 1 (January 2014): 75–83. http://dx.doi.org/10.1016/j.combustflame.2013.08.020.

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Gasparjans, Aleksandrs, Aleksandrs Terebkovs, and Anastasia Zhiravetska. "Voltage Spectral Structure as a Parameter of System Technical Diagnostics of Ship Diesel Engine-Synchronous Generators." Electrical, Control and Communication Engineering 8, no. 1 (July 1, 2015): 37–42. http://dx.doi.org/10.1515/ecce-2015-0005.

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Abstract A method of technical diagnostics of ship diesel engine – generator installation – is proposed. Spectral-power diagnostic parameters of the synchronous generator voltage and currents are used. The electric machine in this case is the multipurpose sensor of diagnostic parameters. A judgment on the quality of the operational processes in diesel engine cylinders and its technical condition is possible on the basis of these parameters. This method is applicable to piston compressor installations with electric drive. On the basis of such parameters as rotating torque, angular speed and angular acceleration it is possible to estimate the quality of the operating process in the cylinders of a diesel engine, the condition of its cylinder-piston group and the crank gear mechanism. The investigation was realized on the basis of a diesel-generator with linear load. The generator operation was considered for the case of constant RL load. Together with the above mentioned, the condition of bearings of synchronous machines, uniformity of the air gap, windings of the electric machine were estimated during the experiments as well. The frequency spectrum of the stator current of the generator was researched and analyzed. In this case the synchronous machine is becoming a rather exact multipurpose diagnostic sensor. The signal of non-uniformity in the operation process of diesel engine cylinders and its technical condition is the increasing of the amplitudes of typical frequencies.

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Perminov, Andrey, Yury Zhuravlev, Yury Lukyanov, Sergey Tikhonov, and Alexander Ilyin. "DETERMINATION OF CHAMBER AND PISTON GEOMETRY FOR A ROTARY TYPE EXPANSION MACHINE." ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 3 (June 20, 2019): 197. http://dx.doi.org/10.17770/etr2019vol3.4060.

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The article deals with the determination of chamber and piston geometry for a rotary expansion machine. Analytical expressions for the working surface area of piston and for chamber volume are derived. Three defining parameters of the expansion machine were obtained: gas dynamic machine constant Cp; constant M0 connecting torque and Cp; the main dimensionless parameter of the machine Q0, which relates the volume of the chamber and the torque.

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Chacon, Rene, and Monika Ivantysynova. "Virtual Prototyping of Axial Piston Machines: Numerical Method and Experimental Validation." Energies 12, no. 9 (May 2, 2019): 1674. http://dx.doi.org/10.3390/en12091674.

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This article presents a novel methodology to design swash plate type axial piston machines based on computationally based approach. The methodology focuses on the design of the main lubricating interfaces present in a swash plate type unit: the cylinder block/valve plate, the piston/cylinder, and the slipper/swash plate interface. These interfaces determine the behavior of the machine in term of energy efficiency and durability. The proposed method couples for the first time the numerical models developed at the authors’ research center for each separated tribological interface in a single optimization framework. The paper details the optimization procedure, the geometry, and material considered for each part. A physical prototype was also built and tested from the optimal results found from the numerical model. Tests were performed at the authors’ lab, confirming the validity of the proposed method.

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Asprilla, Gerry. "Meningkatkan Kinerja Mesin Extrude Hydron Menggunakan Metode Preventive Maintenance." JTTM : Jurnal Terapan Teknik Mesin 1, no. 1 (April 11, 2020): 18–24. http://dx.doi.org/10.37373/msn.v1i1.15.

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Background Hydron extrude machines in line 4 have a high enough total downtime, until the October 2019 period with a total of 264, 33 hours. Damage that often occurs in extrude machines from each Extrude Hydron engine subsystem, namely vacuum filter, vacuum hose and digital vacuum indicator. Aim to focus on steps to reduce damage. And from maintenance ensures the level of reliability and readiness while minimizing maintenance costs. Method on the extrude hydron machine is to use visual inspection and quantitative presentation. Results and Discussion Damage that occurs in vacuum filter components that often need to be caused by dust contamination, Automatic sensors (Limit Switch Piston, Pneumatic Limit Switch Cylinderr) are contaminated with dust particles. In repairing the damage that occurs is based on field conditions, so that the repair downtime is quite long due to the availability of spare parts and technical personnel. Conclusion in minimizing damage to extrude hydron machines using preventive maintenance

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Ningsih, Yuliana, and Kurnia Dwi Artika. "Waste machines as an alternative way to enhance students’ speaking interest." UAD TEFL International Conference 2 (January 19, 2021): 203. http://dx.doi.org/10.12928/utic.v2.5758.2019.

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The phenomenon this time was that many lecturers had fallen asleep with the technological advancements used in the learning media. By relying on a more unique creativity, this study used simple materials from spare parts of a machine that can be used as learning media especially in speaking interest. The paper aims to explore speaking interest through waste machines to the students of Mechanical Engineering, the State Polytechnic of Tanah Laut. It investigates how waste machines can be incorporated in English for Specific Purpose (ESP) learners’ speaking interest. This study was qualitative case study, and data were gathered through observations, field notes and interviews. Data were interpreted based on the prepared achievements indicator. The results of the study reveal that the utilization of waste machines such as shocks, piston, gear, and bold is successful improving speaking skill for the students of Mechanical Engineering. In addition, students also learnt how to deliver in presentation with their field studies.

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Wang, Li Hua, and Xiao Qiang Wu. "The Design of Control System of Piston Pin Punching Recess Automatic Drilling Dedicated Machine Tool." Applied Mechanics and Materials 651-653 (September 2014): 895–98. http://dx.doi.org/10.4028/www.scientific.net/amm.651-653.895.

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The piston pin punching recess automatic drilling machine tool, is a dedicated machine tool designed and manufactured to solve the possess of piston pin punching recess. This paper studies the design of the dedicated machine’s control system, which uses open CNC technology, hydraulic technology, PLC technology, electrical technology, and human-machine interface technology. The control system can achieve the automation of feeding and blanking process. Replace of control panel, adopting touch screen to achieve operational control, and monitor the status of real-time job on the machine.

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Dasgupta, K., A. Mukherjee, and R. Maiti. "Modeling and Dynamics of Epitrochoid Generated Orbital Rotary Piston LSHT Hydraulic Motor: A Bondgraph Approach." Journal of Manufacturing Science and Engineering 118, no. 3 (August 1, 1996): 415–21. http://dx.doi.org/10.1115/1.2831046.

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In this paper the dynamics of epitrochoid generated Orbital ‘rotary piston machine’ (ROPIMA) type ‘low speed high torque’ (LSHT) hydrostatic unit are studied. The complex variation of the volume of a chamber of such a machine with shaft rotation along with dynamic characteristics of the rotary flow distributor valve, interchamber leakages, fluid compressibility, inertia of orbiting rotor, etc. demand a structured approach to arrive at its mathematical model. In conventional approaches the system morphology gets obscured as the mathematical model is arrived at. Owing to the lack of modularity the errors in deduction of equations may remain eclipsed. Bondgraphs provide a structured approach to model engineering systems. The bondgraph model of the LSHT orbital motor is presented in this work. Relevant simulation results are discussed. The mathematical model was found to be stiff and its integrations were costly and time consuming. A tractable approach to estimate its steady state behavior is suggested and validated. The authors believe that such an approach would be suitable in the initial stages of design of such machines and in the development of control systems where these machines are used as actuators.

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Cornett, Andrew Malcolm, Peter Laurich, Enrique Gardeta, and Daniel Pelletier. "DESIGN OF A POWERFUL AND PORTABLE MULTIDIRECTIONAL WAVEMA." Coastal Engineering Proceedings, no. 35 (June 23, 2017): 29. http://dx.doi.org/10.9753/icce.v35.structures.29.

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A new multidirectional wave generator with 72 independent paddles has been designed, fabricated and commissioned at the National Research Council labs in Ottawa, Canada. The wet-back piston-mode machine is installed in a new 50 m long by 30 m wide rectangular wave basin, where water depths can be varied over the range from 0 m up to 1.3 m. The new machine is believed to be unique in the world in that it combines the power and stroke required to generate multidirectional spectral wave conditions with significant wave heights exceeding 0.4 m together with the modularity and ease of portability required to move the machine quickly and safely to new positions. The new machine can also be sub-divided to form several shorter machines if desired. The new wave generator features lightweight, composite materials, energy efficient regenerative power supplies, state-of-the-art software and control systems, including capabilities for active wave absorption (reflection compensation), second-order wave generation for improved generation of nonlinear sub- and super-harmonics, side-wall reflection, and more. The design of this new directional wavemaker is described and several of the more innovative features are highlighted in this paper.

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42

Lorimer, George H., Xue Fei, and Xiang Ye. "The GroEL chaperonin: a protein machine with pistons driven by ATP binding and hydrolysis." Philosophical Transactions of the Royal Society B: Biological Sciences 373, no. 1749 (May 7, 2018): 20170179. http://dx.doi.org/10.1098/rstb.2017.0179.

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In response to the binding of ATP, the two heptameric rings of the GroEL chaperonin protein interact with one another in a negatively cooperative manner. Owing to the helix dipole, the positively charged nitrogen of glycine 88 at the N-terminus of helix D binds to oxygen atoms on the β and γ phosphorus atoms of ATP. In apo-GroEL, the nucleotide-binding sites of different rings are connected to one another by the interaction of the ɛ-amino group of lysine 105 of one helix D across the twofold axis with the negatively charged carbonyl oxygen atom of alanine 109 at the C-terminus of the other helix D. Upon binding ATP, the K105–A109 salt bridge breaks and both helices move apart by approximately 3.5 Å en bloc toward the ATP. Upon hydrolysis of ATP, the helices return to their original position. The helices thus behave as pistons, their movement being driven by the binding and hydrolysis of ATP. This article is part of a discussion meeting issue ‘Allostery and molecular machines’.

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43

El-Ghobashy El-Hagar, Mahmoud Mohamed. "Performance Characteristics of a Reciprocating Piston Pump Driven by a Wind Machine." WSEAS TRANSACTIONS ON POWER SYSTEMS 15 (January 14, 2021): 265–69. http://dx.doi.org/10.37394/232016.2020.15.31.

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The torque applied by a reciprocating pump on a wind machine axis is a fluctuating torque. The energy furnished by the pump on the wind machine axis is absorbed mainly in raising the water and the piston when the latter moves up. This has a direct adverse effect on the starting speed. The lower the maximum torque to be overcome, the easier will the wind machine start. If the necessary torque is high, a faster wind speed is required to start the wind machine. The operating time of the machine is consequently reduced. It is therefore desirable to reduce the starting torque, and hence to make the starting easier. This paper presents a theoretical study to reduce the starting torque of a non-conventional reciprocating piston pump by controlling the stroke volume of the pump or by controlling the flow rate of the piston pump. These two methods are the best to control, smooth and reduce the starting torque of the pump by drilling a very small hole in the piston. The effect of this hole is that at very low speed (at starting) all water that could be pumped is leaked through the hole. This is the main important of the hole which made the pressure on the piston is very low and as a result the starting torque is low. The quantity of water leaking through the hole is small compared to the normal output of the pump. Finally the comparison between normal and leakhole piston pump and the effect of this leakhole on the cavitation phenomena are studied

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Potakhov, Egor. "Telescoping hydraulic cylinder loading during boom equipment rotation." Izvestiya vysshikh uchebnykh zavedenii Gornyi zhurnal, no. 2 (March 30, 2020): 86–98. http://dx.doi.org/10.21440/0536-1028-2020-2-86-98.

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Introduction. Currently, hydraulic equipment for telescopic boom equipment is widely used as working equipment for road, construction, hoisting-and-transport and mining machines. However, not all sides of the dynamic loading of the telescoping hydraulic cylinder have been studied. Research aim. The aim of the work is to study the loading of the telescoping hydraulic cylinder (MTC) taking into account the interaction with the telescopic boom during normalized rotation of the boom equipment and during subsidence of the supporting surface of the hoisting machine during the rotation of the working equipment. Methodology. To study the dynamic loading of the MTC, numerical modeling is carried out in the environment of the specialized Motion functional (complex dynamic and kinematic module) of the SolidWorks software package and the SolidWorks Simulation finite element calculation module. Results. The nature of the loading of the MCP elements was established: the time dependences of the angular displacements of the pistons, as well as the forces of counteraction of the shelves of the sections with the MTC, the walls of the sections with the trunnions of the MTC, the piston with the sleeve of the MTC in the horizontal and vertical planes were obtained. The diagram of the stress-strain state of the MCP under normalized and non-normalized loading is established. Design schemes for loading the section and the central heating circuit in the horizontal and vertical planes are developed. Conclusions. The results will improve the reliability of the MTC during operation, increase the reliability of the description of changes in the technical condition of the MTC, more reasonably determine the overhaul periods, and clarify the values of the diagnostic parameters, which contributes to the improvement of the system of maintenance and repair, as well as the design of the MTC.

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Zhuravlev, Yury, Andrey Perminov, Yury Lukyanov, Sergey Tikhonov, and Alexander Ilyin. "CONSTRUCTION OF PISTON OUTER PROFILE FOR ROTARY TYPE EXPANSION MACHINE." ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 3 (June 20, 2019): 257. http://dx.doi.org/10.17770/etr2019vol3.4059.

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The article discusses methods for constructing piston outer profile for the rotary type expansion machine in order to reduce unwanted (parasitic) volumes and offers options for constructing outer profile of piston using analytical and geometric methods.

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Jiang, Shao Jie, Hua Zhou, and Wei Wang. "Mechanical Kinematic Scheme Design of Automatic Piston Pin Sorting Machine." Advanced Materials Research 490-495 (March 2012): 2241–44. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.2241.

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In centerless grinding machine, piston pin is not convenient for online detection. It is better to be tested and sorted by automatic sorting mechanisms. The piston pin automatic sorting system designed in the paper is a machine based on the detection results to shunt qualified product, nonconforming product and waste automatically. Graph of movement, tree graph of function and morphological matrix charts are mapped, the mechanical movement scheme is determined. Further, the machine is drawn in three-dimensional form. It can shunt product automatically

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Dudnikov, Anatoly, Igor Dudnikov, Vladimir Dudnik, and Taras Lapenko. "Mechanical oscillations in the technological processes of restoration of machine parts." Vibrations in engineering and technology, no. 2(93) (May 31, 2019): 62–67. http://dx.doi.org/10.37128/2306-8744-2019-2-10.

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The paper addresses the issues of increasing the durability of piston pins of automotive and tractor engines through the use of vibration oscillations during their restoration. Experimentally found the optimal values of the angle of inclination of the machined tool – punch and its effect on the amount of metal sticking to the working surface of the punch, which reduces the quality of the processed surface of the piston pins and increases the non-uniformity of deformation in the radial direction and length. The change of the residual strain along the outer and inner diameter of the piston pin during vibratory deformation is shown. The obtained mathematical dependences of the change in residual strain on the outer diameter on the value of the allowance for processing. Experimentally found a relationship that associates residual deformation with the wear of piston pins. The results of the work will be used for the development of technological processes for the restoration of piston pins and bushings of the top heads of connecting rods of various autotractor engines by the method of vibration deformation.

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Maiti, R. "Active Contact Problems in Epitrochoid Generated ‘Floating Axis’ Orbital Rotary Piston Machines." Journal of Engineering for Industry 115, no. 3 (August 1, 1993): 337–40. http://dx.doi.org/10.1115/1.2901669.

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The patterns of contact stresses and rolling-sliding motions at the active contacts of the rotary piston machine (ROPIMA) type hydrostatic units, having “epitrochoid” generated rotor-stator set with epicyclic motion of the “floating axis” rotor, have been investigated. A dimensionless analytical technique, based on Hertz’s contact theory, has been developed. As the stress problem in such machines is a statically indeterminate type a numerical iterative scheme has been adopted for solutions. It is found that the gaps are generated even at the “transition contacts”. Effects of profile modifications on these constraints have been studied. Some results have also been supported experimentally. Optimum values of modifications have also been suggested in most generalized form.

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Hou, Jiang Hua, and Cui Fang Duan. "Research on the Work Space Optimization of the Six Bar Parallel Machine Tool." Advanced Materials Research 1022 (August 2014): 131–34. http://dx.doi.org/10.4028/www.scientific.net/amr.1022.131.

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The paper analyzes the technical characteristics of two kinds of six bar parallel machine tool workspace, gives the technical parameters of the main elements of the piston rod and the platform. Through the research ,the paper obtains the maximum and minimum overhang of the piston rod and the best angle range of the platform in the air and optimizes the structure parameters and workspace of the Six bar parallel machine tool.

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Yan, Xuan Xuan, and Tian Chen. "The Improvement of Control Methods for Small and Medium-Sized Hydraulic Forging Machine." Applied Mechanics and Materials 241-244 (December 2012): 1361–64. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.1361.

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The hydraulic transmission control system in the metal forming equipment makes the piston rod freedom movement. This paper introduces that using PLC but not original relay contact to realize the free movement of the piston rod. Adopting PLC as the control system, the automation degree of the piston rod will be improved. And also ensure the piston rod has a high reliability when it has continuously acting, the system will meet the requirements of the general and flexibility. This paper analyzes the action of the hydraulic system. Subsequently, the methods of the hardware selection and the software program design were illustrated.

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Journal articles on the topic 'Machine pistols'

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