Статті в журналах: "Connecting shaft"

1

Gopal, G., L. Suresh Kumar, K. Vijaya Bahskar Reddy, M. Uma Maheshwara Rao, and G. Srinivasulu. "Analysis of Piston, Connecting rod and Crank shaft assembly." Materials Today: Proceedings 4, no. 8 (2017): 7810–19. http://dx.doi.org/10.1016/j.matpr.2017.07.116.

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2

Fernandes, João, and Ricardo Jónatas. "Experimental flow characterization in a spiral vortex drop shaft." Water Science and Technology 80, no. 2 (July 15, 2019): 274–81. http://dx.doi.org/10.2166/wst.2019.274.

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Abstract Connecting storm-sewers located at rather different elevations may be made with vortex drop shafts in which the energy dissipation is made by the friction between the vertical shaft and the flow and downstream by the impinging jet in a dissipation chamber. Following the first model design in the 1940s, different types of vortex drop shafts have been developed. One of the most used type is the so-called spiral vortex drop shaft developed to work in supercritical flow with good performance in both energy dissipation and space constrains. In this paper, an experimental flow characterization in a spiral vortex drop shaft is conducted covering the three main components of these structures, namely the inlet channel, the vertical shaft and the dissipation chamber. The results include measurement of water depths, pressure and velocity.

3

Rasyid, Kurniadi, and Tutur Angger Pambudi. "Single-plate Swipe Couplings On Four-wheeled Vehicles." Aptisi Transactions On Technopreneurship (ATT) 2, no. 1 (January 22, 2020): 25–33. http://dx.doi.org/10.34306/att.v2i1.56.

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The clutch is an absolutely necessary part of the gasoline cars and the other types where the main drive is obtained from the fuel in the cylinder. The author starts planning this friction coupling with the theory and shifting system of style, then determines the type of clutch plate to be worn, determining the large diameter of the clutch shaft, specifies the thick of the friction plate, the spring reducer, the flywheel connecting Bolt with the flux, the flywheel connecting bolt with the engine shaft, the rivet connector of the friction plate with the spring disc, the rivet of the disc-connector with the sub plate, the rivet of the sub-plate and the spline hub, the rivet of the Cover flux, clutch shaft bearings, bearing holders, as well as heat calculations and age of friction plates. Specifies the type of clutch plate to be worn, determining the large diameter of the clutch shaft, determining the thick of the friction plate, the damper spring, the flywheel connecting Bolt with the flux, flywheel connecting bolt with engine shaft, rivet swipes with friction plate with disc spring, Rivet Connector Spring with sub plate, rivet sub plate rivets with spline hub, rivet fastening rivets with flux cover, clutch shaft bearings, bearing holders, as well as heat calculation and age of friction plates. Single-plate swipes are designed so that they can transmit power/rotation in a rotating or unrotating state. The type of coupling discussed here is the fixed clutch that uses a plate that serves as a medium of friction between the flywheel and the pressing plate. The purpose of writing these planning tasks to meet and complement the course of the machine element, the authors try to plan and discuss the clutch system

4

ZHAO, Guanghui, and Guipeng LIAO. "Elastic-plastic fracture analysis of external thread of drive shaft shell of a positive displacement motor." Mechanics 26, no. 5 (October 20, 2020): 375–82. http://dx.doi.org/10.5755/j01.mech.26.5.24671.

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For a positive displacement motor (PDM), the threaded joint connecting drive shaft shell (DSS) and universal shaft shell that is close to the bit is inclined to fracture. In this paper, elastic-plastic fracture performance of the threaded connection is simulated under both make-up torque and bending moment. Firstly, an FE model, which includes a cracked external thread of the DSS and an engaging internal thread of the universal shaft shell, is established and validated. Secondly, influences of both plastic deformation and the helix angle on fracture properties of the cracked thread are evaluated quantitatively. Meanwhile interactions between two cracks are also discussed. Finally, under the two kinds of loading conditions, i.e. loaded by pre-load only and loaded by both pre-load and bending moment, explicit relationships between characteristic J-integrals and the crack depth are obtained for the DSS.

5

Juraeva, Makhsuda, Kyung Jin Ryu, Sang-Hyun Jeong, and Dong Joo Song. "Influence of mechanical ventilation-shaft connecting location on subway tunnel ventilation performance." Journal of Wind Engineering and Industrial Aerodynamics 119 (August 2013): 114–20. http://dx.doi.org/10.1016/j.jweia.2013.05.016.

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6

OTSUKA, Hitoshi, Jyo SHIMURA, Shigeru KUROSAKI, Kazuyuki MINEO, and Takayuki HIRAMA. "1834 Mechanical Characteristics of Connecting Shaft with Teeth Subjected to Bending Moments." Proceedings of Conference of Kanto Branch 2012.18 (2012): 571–72. http://dx.doi.org/10.1299/jsmekanto.2012.18.571.

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7

Casanova, Fernando, and Carlos Mantilla. "Fatigue failure of the bolts connecting a Francis turbine with the shaft." Engineering Failure Analysis 90 (August 2018): 1–13. http://dx.doi.org/10.1016/j.engfailanal.2018.03.015.

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8

OTSUKA, Hitoshi, Jyo SHIMURA, Shigeru KUROSAKI, Kazuyuki MINEO, and Takayuki HIRAMA. "859 Mechanical Characteristics of Connecting Shaft with Teeth by FEM Stress Analysis." Proceedings of Yamanashi District Conference 2011 (2011): 258–59. http://dx.doi.org/10.1299/jsmeyamanashi.2011.258.

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9

OTSUKA, Hitoshi, Jyo SHIMURA, Shigeru KUROSAKI, Kazuyuki MINEO, and Takayuki HTRAMA. "801 Mechanical Characteristics of Connecting Shaft with Teeth Subjected to Torsional Moments." Proceedings of Yamanashi District Conference 2012 (2012): 208–9. http://dx.doi.org/10.1299/jsmeyamanashi.2012.208.

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10

Sun, Yi, Yuan Cai Liu, and Bing Hua Xia. "Lifting Platform Hinge Shaft Contact Finite Element Analysis." Applied Mechanics and Materials 494-495 (February 2014): 273–76. http://dx.doi.org/10.4028/www.scientific.net/amm.494-495.273.

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The lifting platform connecting hinge shaft finite element analysis by ANSYS software, and the fork arm is connected to the hinge bearing contact surface using spring element, the spring element contact stress situation to determine the hinge bearing and internal and external fork arm, solves the contact with the fork arm of the hinge shaft stress relationship problems, finite element analysis. The model is more accurate. The analysis of ideas can be widely applied to the similar finite element contact analysis.

11

Kim, Hyun Sik, Dong Pyo Hong, and Hee Yong Kang. "Design of the Hybrid-Propeller Shaft Using Composite Materials." Applied Mechanics and Materials 284-287 (January 2013): 687–91. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.687.

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The propeller shaft of rear-wheel drive vehicle transfers power from the engine to rear wheels through the differential gear box. Generally the propeller shaft has a two-piece steel structure of more than 10kg of weight. In this paper, we designed the one-piece hybrid propeller shaft using the aluminum, carbon fiber composite material and glass fiber composite material. Research on the adhesive strength of the hybrid propeller shaft with respect to roughness of aluminum surface was conducted. The one piece hybrid propeller shaft satisfying the performance standards of propeller shaft such as statistic torsion torque strength and first bending natural frequency was manufactured. The manufactured hybrid shaft was assembled with the suitable connecting parts and analyzed for performance verification. This hybrid propeller shaft satisfies all performance standards of propeller shaft for automobile application. The hybrid shaft has vibration characteristics of 237Hz significantly higher than the standard characteristic of 150Hz of the existing two-piece steel structure propeller shaft.

12

Gritto, Roland, Ali Elobaid Elnaiem, Fateh Alrahman Mohamed, and Fadhil Sadooni. "Seismic detection and characterization of a man-made karst analog — A feasibility study." GEOPHYSICS 86, no. 3 (March 19, 2021): WA35—WA48. http://dx.doi.org/10.1190/geo2020-0377.1.

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At the site of a water drainage shaft on the campus of Qatar University that serves as a man-made karst analog, two seismic imaging techniques were adapted to use resonant scattered waves recorded during active-source seismic surveys and during passive ambient-noise surveys. Data acquisition included two seismic transmission surveys that encompassed the shaft and a passive ambient-noise survey that extended across the top of the shaft. Seismic imaging of band-pass-filtered resonance waves correctly estimated the location and dimension of the shaft. Furthermore, the method detected the presence and the location of a horizontal drainage pipe and gravel bed connecting neighboring water shafts. Ambient-noise data were analyzed by computing amplitude values of the seismic records in spectral passbands. The results indicated an amplification of seismic amplitudes above the shaft for low-frequency passbands and a sharp decrease in amplitude values for high-frequency passbands. The high- and low-amplitude values displayed as a function of the receiver position allowed for accurate detection and location of the shaft in space. Ground truthing of the imaging results confirmed the accuracy of the seismic techniques, whereas numerical modeling supported the interpretation of the ambient-noise data. The techniques used do not require knowledge of the seismic velocities in the subsurface, but they depend on a priori information about the approximate location of the target.

13

YAMADA, Yoshito, Fumitaka YAMADA, Mitsugu NOMURA, and Yuzo ONISHI. "Design, Field Measurement and Stability Evaluation of Connecting Section in Large Vertical Shaft." Doboku Gakkai Ronbunshu, no. 693 (2001): 61–72. http://dx.doi.org/10.2208/jscej.2001.693_61.

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14

Kalashnikov, V. F. "Wear of the lower connecting rod end ? Shaft coupling of a piston compressor." Chemical and Petroleum Engineering 31, no. 4 (April 1995): 218–21. http://dx.doi.org/10.1007/bf01152301.

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15

Wang, Tao Fen. "The Force Analysis on the Shaft of Electric Vehicle Based on Unigraphics." Advanced Materials Research 507 (April 2012): 242–45. http://dx.doi.org/10.4028/www.scientific.net/amr.507.242.

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Although the mechanical analysis on electric shaft is a complex and trival analysis process, the analysis method of using UG makes the force analysis of electric shaft single, rapid, accurate, and we realized the graphical level and improve the design efficiency and design quality. Through establishing a mathematical model, this paper analyzed the force characteristic of shaft according to the mathematical model.Then analyzed the force of connecting in rod automobile engine by using 3D software Unigraphics (UG).Fianlly we get the force data, whch provides theoretical basis and technical support for the axis force research of electric vehicle.

16

Gao, Hong Bing, and Zhao Jian Yang. "Dynamic Analysis and Research of Motor’s Elastic Shaft of the Large Miner High Shearer’s Cutting Parts." Applied Mechanics and Materials 108 (October 2011): 105–10. http://dx.doi.org/10.4028/www.scientific.net/amm.108.105.

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Take one large miner high electric draught shearer for example. According to the lumped mass method, the gear’s moment of inertia of the shearer’s cutting part was equivalent to the gears connecting the output shaft of the electric cutting motor, the stiffness of central shaft and coupling was equivalent to the output elastic shaft of the electric cutting motor, and the dynamic analysis model of the elastic shaft of the cutting part was set up. Based on this model, the lagrange equation was built. The critical speed of the elastic shaft system, the motion situation on main vibration and harmonic vibration mode, motor shaft’s angular displacement, angular velocity, and angular acceleration’s dynamic response process under the condition of step loads were all analyzed and obtained. The critical speed provided theoretical basis for choosing the working speed of every shaft system of the shearer. The hollow elastic shaft had a protective effect to cutting motor’s damping and overload. The research results provided theoretical basis for the design of the elastic shaft of large miner high shearer.

17

Lu, Hua Feng, Rong Fa Chen, Yi Hong Zhao, Long Wu, Zhi Long Li, and Hua Yang. "Numerical Simulation and Process Optimization of Aluminum Alloy Connecting Rod Based on ProCAST." Advanced Materials Research 712-715 (June 2013): 549–52. http://dx.doi.org/10.4028/www.scientific.net/amr.712-715.549.

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The structural feature and technical indexes of 2A14 aluminum alloy connecting rod was analyzed. The pouring system of gravity die-casting process was initially designed according to the technical requirements. The gravity filling and solidification stages in the permanent mold were simulated by ProCAST. The simulation results show that the casting defects are predicted and the casting process are improved. The most possible section of crack defects are the transition part between the shaft and the connecting rod small or big end.

18

Nes, Cristian Sorin, Nicolae Faur, and Liviu Marsavina. "3-Dimensional Stress Intensity Factor Determination for a Notched Shaft under Mixed Mode Loading." Key Engineering Materials 488-489 (September 2011): 722–25. http://dx.doi.org/10.4028/www.scientific.net/kem.488-489.722.

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Objectives: Numerical determinations of Stress Intensity Factors (SIFs) for a shaft under mixed-mode load with a crack of different sizes in the connection zone between square and circular cross-sections. Methods: Linear-elastic Fracture Mechanics principles are used. The numerical analysis program used was ABAQUS CAE version 6.9-3. The shaft consists in a circular section and a square section, with a fillet connecting zone. Cracks of different lengths and different depths are modeled. The shaft is subjected to torsion and bending. The SIFs were determined using the contour integral method. Results: The stress distribution was determined and plotted, and the stress concentration effect of the notches was highlighted. Crack propagation was also performed, using the XFEM module of ABAQUS code. The computed SIFs were plotted along the crack front. Conclusions: Crack initiation and propagation matched the pattern obtained in experimental tests, thus validating the model. The results confirmed that the fillet zone between the two sections acts as a stress concentrator. The fillet radius determines the magnitude of stress concentration. Crack geometry has a significant influence on SIFs, as well as on the global stress distribution.

19

Ding, Fa Jun. "Piston Engine Connecting Rod Transient Dynamic Finite Element Analysis and Maintenance Strategy." Applied Mechanics and Materials 484-485 (January 2014): 272–76. http://dx.doi.org/10.4028/www.scientific.net/amm.484-485.272.

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Connecting rod is the very important connection and force bearing parts of piston engine crank mechanism; work in the role of various kinds of alternating stress. Taking a general rod from Lycoming IO-360-A1B6 aero-piston engine as the analysis object, first, a 3-D finite element model of the rod is established in ANSYS Workbench. And then, considering the influence of gas pressure in cylinder after ignition acting on the connecting rod under engines rated speed conditions, through the transient dynamic analysis, find in all load steps, the maximum equivalent stress occurred at the transition zone between the shaft and little head, and received the maximum equivalent stress versus time curve, to provide numerical basis for improving high-cycle fatigue reliability of the rod. Finally, according to equivalent stress contours of the rod when gas in cylinder peak pressure occurs, initially identified rods hazardous areas,to provide foundation for the development of standard repair process.

20

Lu, Li Jun, Jian Ping Liu, and Zhong Mei Li. "The Calculation of Stress Intensity Factors and the Analysis of Propagation Characteristic of Crack at Hole." Advanced Materials Research 250-253 (May 2011): 1856–61. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.1856.

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This paper focusing on the crack at hole of guyed-mast’s ear-plate connecting cables and shaft of guyed-mast, adopting two degree of freedom crack propagation model, track the crack propagation according to the increment of the deepest point and the surface point on the crack front of crack at hole of guyed-mast’s ear-plate. The stress intensity factors of I,II and III type crack with given shape and size have been calculated via finite element method, and a numerical method of calculating stress intensity factors with any shape and size crack has been proposed; furthermore according to modified I, II and III type compound crack propagation velocity formula on the basis of Paris crack propagation velocity formula, we analyzed the changing of crack shape parameter a/c with crack size parameter a/T of crack at hole of ear-plate connecting cable and shaft of guyed-mast by numerical integration method and obtained the propagation characteristic.

21

Deng, Hao, Cunyun Pan, Xiaojun Xu, and Xiang Zhang. "A twin-rotor piston engine with annular connecting chambers." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 227, no. 5 (August 3, 2012): 1080–89. http://dx.doi.org/10.1177/0954406212455758.

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An effort in progress to develop a new twin-rotor piston engine is described. A proposition of sealing, which benefits from the conventional piston-cylinder structure is presented. A six-stroke twin-rotor piston engine, which is designed to have coolant intake and drain stroke is proposed. A differential velocity drive mechanism, which controls the rotors’ oscillation, is invented. The differential velocity drive mechanism utilizes novel kinematic design to completely eliminate inertial loads. The twin-rotor engine is expected to have three key technical advantages for attaining higher power density than any available piston engine: the first is symmetrical structure and well-balanced kinetics; the second is 16 or more power strokes per revolution of the output shaft and more than two symmetrical working chambers exporting power at any time; the third is performing the four-stroke cycle without using the valve mechanism.

22

Jin, Jie, and Fang Yan Ning. "Computer Simulation of Melt Flow in Different Gate System for Metal Injection Molding Connecting Shaft." Advanced Materials Research 154-155 (October 2010): 964–68. http://dx.doi.org/10.4028/www.scientific.net/amr.154-155.964.

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On the basis of continuous medium theory, computer simulation analysis of metal-powder injection molding was carried out with the help of FLOTRAN hydro-analysis module of ANSYS software. The effects of the gates with different dimension and location were testified. The impact of gate system on the filling process is discussed. The dynamic display of the flow leading edge in the cavity, and temperature field of the melt were researched. A result was obtained that we can modify the design of runner system if we make a full use of existing equipment resource.

23

Xu, Xiao-lei, and Zhi-wei Yu. "Damage Features of Bolts Connecting Main-Shaft with Turbo-Disk Used in a Locomotive Turbocharger." Journal of Failure Analysis and Prevention 9, no. 4 (May 12, 2009): 380–84. http://dx.doi.org/10.1007/s11668-009-9258-6.

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24

Turla, Vytautas, and Igor Iljin. "THE INVESTIGATION OF DYNAMICS OF MISALIGNED UNITS IN VEHICLE TRANSMISSION." TRANSPORT 17, no. 6 (December 31, 2002): 226–29. http://dx.doi.org/10.3846/16483840.2002.10414048.

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In the article the problems related to the dynamics of a mechanic system on misalignment of shafts in radial direction are presented. The object of the investigation is a two-shaft system connected with an elastic centrifugal ring coupling. Using equations of static equilibrium it was found that an internal moment of resistance to rotation appears in the coupling connecting the radially misaligned shafts. Using Dalamber's principle for the rotational movement the differential equation that describes the rotation of the second shaft has been developed. It was shown that after the perfonnance of the corresponding actions and the introduction of a new variable the said equation is transformed in to an equation which character virtually coincides with the equation describing free oscillations of a mathematical pendulum. Because the value of misalignment of shafts in the radial direction is small in comparison with other parameters, a small parameter method was used for the solution of this equation. The found solutions show that rotational vibrations with the double frequency of rotational movement are excited in the misaligned mechanical system with an elastic centrifugal ring coupling. The restrictions ofthe application of a small parameters method have been explored and the limits of its application have been found.

25

Wang, Hai Tao, Shi Feng Xu, and Li Ping Huang. "Renovation Design of Coal Powder Conveyor Bearing Support." Applied Mechanics and Materials 120 (October 2011): 335–38. http://dx.doi.org/10.4028/www.scientific.net/amm.120.335.

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The bearing support breakage of screw coal powder conveyor in power plant boiler went through four stages: axial displacement of shaft sleeve, shaft sleeve wearing by shield ring and by bearing, and the wearing of skeleton seal rings and dustproof felts by shaft sleeve. By analyzing the wearing characters of each part, the renovation structure was designed. The bearing settled style was changed from using shield ring to using locknut by designing convex sidestep on the shaft sleeve, preventing the axial from drifting. Substituting for the welding assembly, the bolt connecting between the covers and the bearing support body was selected to replace the worn sealing materials easily in dismantling and installing. Good operating effects were achieved after the renovation of the coal powder conveyor bearing support, in the screw coal powder manufacturing line of 100MW power plant boiler, there was no line vibrating, coal leaking, noising and line locking, having decreased the repairing cost greatly and insuring the safety and stable electric power producing.

26

Bodzás, Sándor. "The influence of the shaft angle value on the normal stress and displacement repartition by bevel gear pairs − a TCA investigation." Mechanics & Industry 21, no. 6 (2020): 624. http://dx.doi.org/10.1051/meca/2020098.

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Five types of bevel gear pairs having straight teeth were designed to analyze the effect of the modification of the shaft angle. This angle is the parameter − subject of TCA. After the geometric design process and the creation and assembly of the CAD models, Tooth Contact Analysis (TCA) was performed in order to get the mechanical parameters focusing of the tooth roots of the connecting teeth. We repeated this process five times since the load torques were also changed. The received mechanical parameters on the teeth connection of the pinion and the driven gear were analyzed with taking in consideration all four-tooth root surfaces that limit the contacting teeth pair. Finally, we referred to the useful selection of the appropriate gear pair for the engineering application.

27

Yin, Bi Feng, Jiang Guang He, Yi Xu, and Yong Qiang Li. "The Novel Design of Full-Balancing Mechanism for Single-Cylinder Diesel Engine." Applied Mechanics and Materials 37-38 (November 2010): 1520–24. http://dx.doi.org/10.4028/www.scientific.net/amm.37-38.1520.

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One new sliding-block balancing mechanism is proposed for the single-cylinder diesel engine. In the new mechanism, the sliding block is installed against the engine piston. The reciprocation trajectory of sliding block is collinear with the piston trajectory, while sliding block and piston move in the opposite direction, just like two opposite crank connecting rods. The new mechanism includes the crankshaft, connecting rod ring, the slider and the guide components. Through the bearing, connecting rod is installed in the eccentric journal of the crankshaft. The circular connecting rod is in the accurate guiding surface of the slider; and the guide pins are in the guide groove. Guide rod connects with supporting shaft through the guide hole of the slide. The optimized parameters for the sliding block show that the ratio of eccentric distance of the eccentric journal to the length of the connecting rod is equal to the ratio of crank radius to connecting rod length. The appropriate results can balance both the centrifugal inertia force and the reciprocating inertia force generated by piston group. Even the complete balance of the first and second-order reciprocating inertia forces can be obtained, which can reduce the vibration and noise of diesel engine.

28

Rząsa, Mariusz, Ewelina Łukasiewicz, and Dariusz Wójtowicz. "Test of a New Low-Speed Compressed Air Engine for Energy Recovery." Energies 14, no. 4 (February 23, 2021): 1179. http://dx.doi.org/10.3390/en14041179.

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The paper presents a new design solution for the multi-cylinder compressed air engine, described in the PL 216801 patent. A characteristic feature of the engine is its double-piston operation with pistons working in pairs in opposition and a reciprocating movement in toroidal cylinders. The energy of compressed air was used more effectively in the described engine than in the solutions known so far. Comparing the engine built in accordance with the PL 216801 patent with the parameters of the MP165 and MP3000 engines, lower air consumption in relation to the power generated on the shaft is demonstrated. The described engine uses only one crankshaft and one straight complex shaft, which constitutes an innovative combination of pistons, while maintaining the same engine operation as in the case of two crankshafts operating with phase shift and working chamber shift. Such a solution results in a reduction in the harmful space occurring at the beginning of the power stroke to the value close to “zero”—the necessity to maintain the minimum distance between the pistons working in one cylinder when they are at their closest exists only to for the sake of collision-free operation—which is very desirable for the compressed engine operating with a shift of the working chamber. The mechanical efficiency of the engine has also been improved by guiding the pistons on the complex shaft, and the number of kinematic nodes was decreased by applying only three connecting rods supporting six pistons, which also makes it possible to improve the power and mass relation by approximately 25% in comparison with the currently known engines of similar power.

29

Sibryaev, Konstantin Olegovich, Maxim Michailovich Gorbachev, and Adel Damirovich Ibadullaev. "DEVELOPING INFORMATION PROCESSING UNIT USED IN SOFTWARE AND HARDWARE COMPLEX MONITORING SHIP SHAFT LINE TORSIONAL VIBRATIONS." Vestnik of Astrakhan State Technical University 2021, no. 1 (May 31, 2021): 22–28. http://dx.doi.org/10.24143/1812-9498-2021-1-22-28.

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The article considers torsional vibrations in combination with other technical factors, which remain a cause of damages and breakdowns of the ship's propeller shafts, intermediate shafts and crankshafts. Torsional vibrations inevitably occur in the ship plants. It can be explained by the uneven torque of the engine and the torque on the propeller (exposure of the propeller, uneven movement of the water flow, stormy weather, etc.), which leads to alternating twisting of the shaft. To reduce torsional vibrations, dampers are used, which require periodic performance testing by using the torsiography procedure. In contrast to the existing monitoring systems of the technical condition of the damper, it is planned to install an information processing unit for the software and hardware complex for monitoring torsional vibrations of the ship's shaft line and the parameters associated with them (vibration and temperature changes of the flexible elements of the connecting couplings). The unit under development will allow to constantly monitor the level of torsional vibrations and, if they increase, to signal the ship's mechanic to switch to another operational mode of the main engine, which will increase the reliability and automation of the ship power plants, the safety of navigation, and reduce the economic costs of ship operating

30

Zhu, Xiaohua, Dian Lin, and Jianan Li. "Failure analysis and structure optimization of the connecting thread of driving shaft in positive displacement motor." Advances in Mechanical Engineering 8, no. 6 (June 2016): 168781401665231. http://dx.doi.org/10.1177/1687814016652313.

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31

Grachev, V. "Aluminium Alloys Smelting in Shaft- Reverberatory Furnaces in a Liquid Bath Mode." Archives of Foundry Engineering 17, no. 2 (June 27, 2017): 183–89. http://dx.doi.org/10.1515/afe-2017-0072.

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AbstractThe aim of research was creation of a furnace for aluminum alloys smelting “in a liquid bath” in order to reduce metal loss. In the paper, the author demonstrates the results of research on smelting of aluminum alloys in a shaft-reverberatory furnace designed by the author. It has been shown that smelting aluminum alloy in a liquid bath was able to significantly reduce aluminum loss and that shaft-reverberatory design provided high efficiency and productivity along with lower energy costs. Ensuring continuous operation of the liquid bath and superheating chamber, which tapped alloy with the required texture, was achieved by means of the optimal design of partition between them. The optimum section of the connecting channels between the liquid bath of smelting and the superheating chamber has been theoretically substantiated and experimentally confirmed. The author proposed a workable shaft-reverberatory furnace for aluminum alloys smelting, providing solid charge melting in a liquid bath.

32

Song, Myeong-Ho, Taek-Kun Nam, and Jae-ung Lee. "Self-Excited Torsional Vibration in the Flexible Coupling of a Marine Propulsion Shafting System Employing Cardan Shafts." Journal of Marine Science and Engineering 8, no. 5 (May 13, 2020): 348. http://dx.doi.org/10.3390/jmse8050348.

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The reliability of propulsion shafting systems is a major concern for ocean-going vessels because mid-ocean repairs can be time-consuming and spare parts must be available. To address this concern, vibration modeling and experimental measurements were conducted on a propulsion shafting system with a Z-drive propeller, with the objective of identifying the source of failure for the flexible rubber coupling connecting the diesel engine with the intermediate shaft. The torsional fluctuations in the flexible coupling dramatically increased and then abruptly ceased. The modeling results revealed that the frictional losses during power transmission through the universal joints could act as an excitation force for self-excited vibration. The coupling connected to the intermediate shaft did not have sufficient radial flexibility to dampen these vibrations. To avoid the effects of the self-excited torsional vibration, it is recommended that this coupling is replaced with one that is capable of absorbing the radial shaft displacement.

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Han, HyungSuk, KyungHyun Lee, Sungho Park, and ChungSik Kim. "Analysis of the Vibration Fatigue for the Diesel Engine and Reduction Gear Connecting Shaft in a Ship." Transactions of the Korean Society for Noise and Vibration Engineering 24, no. 5 (May 20, 2014): 407–13. http://dx.doi.org/10.5050/ksnve.2014.24.5.407.

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34

Bartlett, H., and R. Whalley. "Power transmission system modelling." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 212, no. 6 (June 1, 1998): 497–505. http://dx.doi.org/10.1243/0954406981521394.

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This paper employs hybrid modelling techniques in the investigation of the dynamic performance of ‘long’ driveshafts, which include a clutch and load, for power transmission purposes. The power transmission system considered is suitable for a wide variety of applications in which the load is coupled directly to the clutch and hence to the ‘long’ driveshaft. Owing to the length of the shaft and relatively pointwise location of the clutch and load, a distributed—lumped (D—L) description of the arrangement is investigated. This enables the behaviour of the dispersed driveline shaft to be ‘adequately’ replicated along with the connecting elements. A discrete modelling approach is adopted and analysis and simulated response characteristics are presented, thereby validating the technique. Existing results on clutch judder are referred to and the interaction between judder and the driveshaft torsional oscillation is commented upon.

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Fessler, H., and C. J. Moore. "Stresses in a Splineless Drive for Aero-Engines." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 210, no. 2 (April 1996): 189–202. http://dx.doi.org/10.1243/pime_proc_1996_210_360_02.

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This paper describes an alternative to splines for connecting turbine discs to shafts. The trilobe shape consists of six smoothly blending 60° circular arcs of two alternating radii; it is between a circle (both radii equal) and a triangle (smaller radius zero, larger radius infinite). Frozen-stress, photoelastic models of a realistic disc and a tubular shaft have been designed, made and loaded centrifugally, under static torsion and under combined torsion and rotation. The results show that the greatest centrifugal stresses in the disc occur in the bore at the tips of the trilobe and the greatest contact stresses occur near the transition from the larger to the smaller radius. The centrifugal stress concentrations due to the trilobe were small. Bore deformation and backlash due to differential centrifugal expansion were measured and found to be acceptable for a similar ceramic or nickel alloy disc.

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Fujioka, Yasuo, and Tomotsugu Sakai. "Rotating Loosening Mechanism of a Nut Connecting a Rotary Disk Under Rotating-Bending Force." Journal of Mechanical Design 127, no. 6 (February 27, 2005): 1191–97. http://dx.doi.org/10.1115/1.2049087.

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Structures composed of a rotary disk and a shaft, which are fastened with bolts and nuts having tapered bearing surfaces, are loaded with a rotating-bending force. Upon investigation, two rotating mechanisms of the nut were derived. In one mechanism a high-pressure contact area is formed at the nearest loading point on threads and bearing surfaces. This leads to a difference in the curvature radii between the bearing surface of the disk and that of the nut. During the revolution of the disk, two friction torques occur in opposite directions on the bearing surface and the threads, respectively. The relative rotating direction of the nut is dominated by the greater torque. The other mechanism is due to the eccentricities caused by dimensional errors of the bolt, nut, and disk. By combining the two mechanisms, the rotations of the nuts either cause a loosening or tightening after many revolutions of the disk.

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Optasanu, Virgil, and Dominique Bonneau. "Finite Element Mass-Conserving Cavitation Algorithm in Pure Squeeze Motion. Validation/Application to a Connecting- Rod Small End Bearing." Journal of Tribology 122, no. 1 (June 9, 1999): 162–69. http://dx.doi.org/10.1115/1.555339.

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A simple analytical approach using conditions of conservation of the mass is proposed for the 1-D “negative squeeze” lubrication problem in order to calculate the cavitation boundary position during oscillatory motion of two plates. The same geometrical case is analyzed using Bonneau’s finite element code. Good agreements between analytical and numerical results support validation of Bonneau’s algorithm. As an example of application of this algorithm to squeeze motion case, the EHD lubrication of an elastic connecting-rod small end bearing is analyzed. Influences of the shaft elasticity and lubricant piezoviscosity are presented. [S0742-4787(00)02101-9]

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Gong, Xiang Hui. "Tennis Transmitter Design and Parameter Optimization." Applied Mechanics and Materials 401-403 (September 2013): 304–7. http://dx.doi.org/10.4028/www.scientific.net/amm.401-403.304.

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Design of tennis transmitter design parameters, structure design, choice of institution, etc., the transmitter in accordance with the standards of the international tennis federation (ITF) to carry on the design. Design and institutional selection includes the realization of the crank connecting rod mechanism and control motor sports, ball tray and ball under the control of the speed of tennis, crowded ball wheel speed regulating motor selection, crowded round ball structure design and checking calculation, the design and checking calculation of shaft, casing and bracket material design and the selection, selection of walking wheel, etc.

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Luo, Jian Guo, and Mao Yan He. "Kinetics Analysis on 2PPRR-ST-2PPRR Mechanism." Applied Mechanics and Materials 271-272 (December 2012): 1001–5. http://dx.doi.org/10.4028/www.scientific.net/amm.271-272.1001.

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New type of 2PPRR-ST-2PPRR mechanism in singular configuration,kinetics equations and Euler’s equations constructed,complete analysis of each jointed points of the moving platform carried out,inverse kinetics solution can be obtained with the given parameters,which include the position and orientation of the manipulator,applied force on the output shaft,parameters of motion of output shaft and connecting bar and sliding block,Newton-Euler method adopted to analysis its kinetics,program used to get the intuitionistic graph result of analysis,conclusion deduced from the result,difference exist in the changing rule of force of joints on upper layer platform and under layer platform,the changing rule of force of joints on the same platform is the same,sensitive exist in direction of axis x,y,z of force of joints on under layer platform,while sensitive exist in direction of axis z of force of joints on upper layer platform only.

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Hirani, H., K. Athre, and S. Biswas. "Dynamic Analysis of Engine Bearings." International Journal of Rotating Machinery 5, no. 4 (1999): 283–93. http://dx.doi.org/10.1155/s1023621x99000251.

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This paper presents a simple methodology to evaluate the stiffness and damping coefficients of an engine bearing over a load cycle. A rapid technique is used to determine the shaft ‘limit cycle’ under engine dynamic loads. The proposed theoretical model is based on short and long bearing approximations. The results obtained by present approximation are compared with those obtained by numerical method. The influence of thermal effects on the stiffness and damping coefficients is predicted by using a simplified thermal analysis. In order to illustrate the application of the proposed scheme, one engine main bearing and a connecting rod bearing are analysed.

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Kamiński, Marcin, and Krzysztof Szabat. "Adaptive Control Structure with Neural Data Processing Applied for Electrical Drive with Elastic Shaft." Energies 14, no. 12 (June 8, 2021): 3389. http://dx.doi.org/10.3390/en14123389.

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This paper presents issues related to the adaptive control of the drive system with an elastic clutch connecting the main motor and the load machine. Firstly, the problems and the main algorithms often implemented for the mentioned object are analyzed. Then, the control concept based on the RNN (recurrent neural network) for the drive system with the flexible coupling is thoroughly described. For this purpose, an adaptive model inspired by the Elman model is selected, which is related to internal feedback in the neural network. The indicated feature improves the processing of dynamic signals. During the design process, for the selection of constant coefficients of the controller, the PSO (particle swarm optimizer) is applied. Moreover, in order to obtain better dynamic properties and improve work in real conditions, one model based on the ADALINE (adaptive linear neuron) is introduced into the structure. Details of the algorithm used for the weights’ adaptation are presented (including stability analysis) to perform the shaft torque signal filtering. The effectiveness of the proposed approach is examined through simulation and experimental studies.

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Qin, Li Li, and Xiao Hui Cao. "Balance Analysis of Reciprocating Inertia Force Based on Multi-Body System Simulation." Advanced Materials Research 538-541 (June 2012): 709–12. http://dx.doi.org/10.4028/www.scientific.net/amr.538-541.709.

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In signal cylinder diesel engine we often use dual shaft balance mechanism to balance reciprocating inertia force produced by the piston and moving parts, and reduce vibration of diesel engine. For this paper, the model crank -connecting rod and balance mechanism of a signal cylinder diesel engine were built in simulation software ADAMS. Piston’s movement law and its force curve have got through multi-body dynamics simulation to the model .By further processing to the simulation results, we got curves of piston’s reciprocating inertia force and balance shaft’s balance force. Comparing the two curves, we got the following conclusions: the difference between positive and negative peak for reciprocating inertia force that haven’t balanced was about 5500 Newton, which was equal to around 34% of the difference between the positive and negative peak for reciprocating inertia force, and the main reason for this is the dual shaft balance mechanism only balanced one step reciprocating inertia force; Though the balance effect was quite obvious, for ideal conditions there is a difference, and further improve can be done.

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Yu, Zhiwei, and Xiaolei Xu. "Failure analysis of connecting bolts and location pins assembled on the plate of main-shaft used in a locomotive turbochanger." Engineering Failure Analysis 15, no. 5 (July 2008): 471–79. http://dx.doi.org/10.1016/j.engfailanal.2007.05.006.

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Raben, Niels, Martin Heyman Donovan, Erik Jørgensen, Jan Thisted, and Vladislav Akhmatov. "Grid Tripping and Re-connection: Full-scale Experimental Validation of a Dynamic Wind Turbine Model." Wind Engineering 27, no. 3 (May 2003): 205–13. http://dx.doi.org/10.1260/030952403769016681.

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An experiment with tripping and re-connecting a MW wind turbine generator was carried out at the Nøjsomheds Odde wind farm in Denmark. The experimental results are used primarily to validate the shaft system representation of a dynamic wind turbine model. The dynamic wind turbine model is applied in investigations of power system stability with relation to incorporation of large amounts of wind power into the Danish power grid. The simulations and the measurements are found to agree. The experiment was part of a large R&D program started in Denmark to investigate the impact of the increasing capacity of wind power fed into the Danish power grid.

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Гладышев, Andrey Gladyshev, Алейников, Andrey Aleynikov, Афонин, Andrey Afonin, Попова, and Anastasiya Popova. "DEVELOPMENT OF MATHEMATICAL MODEL OF THE CONTROL SYSTEM OF LINKS OF THE SNAKE LIKE ROBOT." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 2, no. 1 (December 8, 2016): 150–54. http://dx.doi.org/10.12737/24122.

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The mathematical model of a modular control system of links of the snake like robot for realization of the wave movement considering the moments of the external forces created by adjacent links and external indignations is given in work. As model of the electric drive of a direct current the differential equation of the second order connecting tension of u(t) given on the electric motor, the moment of loading of Mn (t) and an output angle of rotation of a shaft θ(t) is used. Transfer functions of separate links are calculated, and transfer function of a control system in general is received.

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Ha, Vo Thanh, Tung Lam Nguyen, and Vo Thu Ha. "Hardware-in-the-loop based comparative analysis of speed controllers for a two-mass system using an induction motor drive with ideal stator current performance." Bulletin of Electrical Engineering and Informatics 10, no. 2 (April 1, 2021): 569–79. http://dx.doi.org/10.11591/eei.v10i2.2370.

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A comparative study of speed control performance of an induction motor drive system connecting to a load via a non-rigid shaft. The nonrigidity of the coupling is represented by stiffness and damping coefficients deteriorating speed regulating operations of the system and can be regarded as a two-mass system. In the paper, the ability of flatness based and backstepping controls in control the two-mass system is verified through comprehensive hardware-in-the-loop experiments and with the assumption of ideal stator current loop performance. Step-by-step control design procedures are given, in addition, system responses with classical PID control are also provided for parallel comparisons.

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Medina, S., and A. V. Olver. "Regimes of Contact in Spline Couplings." Journal of Tribology 124, no. 2 (July 19, 2001): 351–57. http://dx.doi.org/10.1115/1.1403456.

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The contact between the male and female teeth of involute spline couplings connecting misaligned transmission shafts has been studied using an elastostatic contact model with stick-slip friction based on the boundary integral element method. The effect on the distribution of pressure and on the slip path during shaft rotation, of a wide range of design parameters and of applied torque and misalignment has been explored. The predicted behavior is classified according to the regime of friction (cyclic stick-slip or gross slip) and to that of the pressure history (uniform, cyclic, discontinuous, or toppled). The magnitude of the maximum tooth load, the axial skewness of the distribution of pressure and a maximum wear depth parameter are presented in terms of dimensionless design and operating parameters. The effect of tooth crowning is briefly examined. The results show a number of previously unreported features including a cyclic tooth load—which declines to zero for certain conditions—and an effective slip amplitude of around half the rigid-body value. This may affect the interpretation of laboratory fretting tests.

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Yuan, Jian Ping, Zhi Xia He, Qian Wang, and Ju Yan Liu. "Visual Computation of Thermohydrodynamic Lubrication of Dynamically Loaded Journal Bearings." Advanced Materials Research 97-101 (March 2010): 3781–84. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.3781.

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The Reynolds equation and energy equation with the thermal balance equation in combination were applied to build the thermohydrodynamic (THD) computational model of the dynamically loaded journal bearings. The most popular development platform——Visual C ++ in the field of computer science and the drawing platform of AutoCAD were combined with the medium of ObjectARX and the object oriented programming technology was used, on the basis of which, the visual computational software of the THD lubrication of the dynamically loaded journal bearings for main shaft and connecting rod bearings of automobile engines was developed. The analysis results of an example indicate that the bearing behaviors are closely tied to the radial clearances and inlet lubricant temperature of the bearing.

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Han, Hyung-Suk. "Analysis of fatigue failure on the keyway of the reduction gear input shaft connecting a diesel engine caused by torsional vibration." Engineering Failure Analysis 44 (September 2014): 285–98. http://dx.doi.org/10.1016/j.engfailanal.2014.05.012.

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Houpert, L. "A Uniform Analytical Approach for Ball and Roller Bearings Calculations." Journal of Tribology 119, no. 4 (October 1, 1997): 851–58. http://dx.doi.org/10.1115/1.2833896.

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A novel analytical approach is proposed, uniform for ball and roller bearings, which takes into account 5 relative race displacements (3 translations: dx, dy, and dz, and 2 tilting angles: dθy and dθz) to provide simple analytical relationships for calculating directly the resulting 3 bearing loads: Fx, Fy, and Fz as well as the 2 tilting moments: My and Mz. A full coupling between all these displacements and forces is considered. The maximum rolling element load Qmax, the load distribution Q(Ψ) and the 3-D rolling element load distribution dQ(Ψ, x′) at each roller-race contact slice are also given analytically. It will therefore be possible for bearing users, willing to study for themselves a complete statically indeterminate systems including shafts, housing and bearings, to do such calculations using accurate nonlinear bearing forces-displacements relationships suggested in this paper and to predict easily bearing and other system components performances. This approach can also be implemented in any nonlinear Finite Element Analysis (F.E.A.) package for describing a bearing element connecting the shaft to the housing for example. It completes, therefore, the F.E.A. library of elements.

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