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Journal articles on the topic 'Dynamic machine'
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1
Hwang, Yunn Lin, and Van Thuan Truong. "A Synchronous Approach for Numerical Simulation of Machine Tools." Key Engineering Materials 642 (April 2015): 317–22. http://dx.doi.org/10.4028/www.scientific.net/kem.642.317.
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In this paper, a synchronous approach for dynamic simulation of machine tools is described. Computer Aided Engineering (CAE) method models and analyzes a dynamical parameter prototype of machine tools. In which, the flexible structure, interactive movement, non-linear factor effects as well as characteristics of resonance frequencies and mechanical transfer function are considered. The integrating Finite Element Method (FEM), Multi-Body Dynamics (MBD) and control carries out a solution of machine tools simulation for predicting dynamic machine behaviors. The static analysis and modal analysis of components are presented with sample examples. Cybernetic characteristics like Bode diagram and such a controller are implemented for movement tailors. The synchronous approach deduces a practically technical method for machines tools.
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Feng, Zengming, Fuliang Suo, and Yabing Cheng. "58793 MESHING MECHANISM AND DYNAMIC ANALYSIS OF NEW SILENT CHAIN(Dynamics of Machine Components)." Proceedings of the Asian Conference on Multibody Dynamics 2010.5 (2010): _58793–1_—_58793–5_. http://dx.doi.org/10.1299/jsmeacmd.2010.5._58793-1_.
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Li, Din Geng, Ji Guang Cao, Jun Wen Wang, and Chuan Yao Chen. "The Design and Analysis of a New Type of Vibration Structure." Applied Mechanics and Materials 1-2 (September 2004): 71–80. http://dx.doi.org/10.4028/www.scientific.net/amm.1-2.71.
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In this paper, a new type of vibration structure (i.e. swing frame) of vertical dynamic balancing machine is designed, which is based on the analysis of traditional double-plane vertical dynamic balancing machine’s swing frame. The static unbalance and couple unbalance can be separated effectively by using the new dynamic balancing machine with the new swing frame. The modal and harmonic responses are analyzed by using the ANSYS7.0. By comparing the finite element modal analysis with the experimental modal analysis, the natural frequencies and vibration modes are found out, which can provide the dynamics direction for designing vertical dynamic balancing machine. The new dynamic balancing machine can measure static unbalance and couple unbalance directly, and the influence between them is faint. The practical result indicates that the new vertical dynamic balancing machine is suitable for inertial measurement of flying objects, and can overcome the shortcomings of traditional double-plane vertical dynamic balancing machines, in which the effect of plane-separation is inferior. The vertical dynamic balancing machine with the new vibration structure can be widely used in the future application.
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Zhu, Jian Min, Hai Wei Li, and Zhi Wen Huang. "Grey Correlation Analysis-Based Comprehensive Dynamic Characteristics Evaluation of NC Machine Tool." Advanced Materials Research 479-481 (February 2012): 1230–36. http://dx.doi.org/10.4028/www.scientific.net/amr.479-481.1230.
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The dynamic characteristics of the NC machine are the important technical indicators of NC machine performance, and the precision of existing machine's dynamic characteristics evaluation analysis that based on structural dynamics modeling and simulation is poor. For this problem, this paper presents NC machine dynamic characteristics evaluation methods based on Grey Correlation Analysis. This method, by measuring the vibration signal of feature points in NC machine and making 1/3 octave spectrum analysis for vibration signal, can obtain the characteristics data sequence of vibration signal. Through the grey correlation analysis method, calculate the relevancy between the characteristics data sequence of each vibration signal and that of ideal dynamic characteristics, and quantitatively evaluate the dynamic characteristics of machine tools according to the size of the grey correlation. Took three same type NC milling machines as study objects, designed the cutting vibration resistance experiments, used this paper's method for the evaluation analysis of the comprehensive dynamic characteristics of NC milling machine, and obtained the evaluation results which is in line with the actual dynamic characteristics of machine tools, and verified the evaluation method of comprehensive dynamic characteristics that proposed in this paper.
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Poll, Hans Günther, José Carlos Zanutto, and Walter Ponge-Ferreira. "Hydraulic Power Plant Machine Dynamic Diagnosis." Shock and Vibration 13, no. 4-5 (2006): 409–27. http://dx.doi.org/10.1155/2006/203834.
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A method how to perform an entire structural and hydraulic diagnosis of prototype Francis power machines is presented and discussed in this report. Machine diagnosis of Francis units consists on a proper evaluation of acquired mechanical, thermal and hydraulic data obtained in different operating conditions of several rotary and non rotary machine components. Many different physical quantities of a Francis machine such as pressure, strains, vibration related data, water flow, air flow, position of regulating devices and displacements are measured in a synchronized way so that a relation of cause an effect can be developed for each operating condition and help one to understand all phenomena that are involved with such kind of machine. This amount of data needs to be adequately post processed in order to allow correct interpretation of the machine dynamics and finally these data must be compared with the expected calculated data not only to fine tuning the calculation methods but also to accomplish fully understanding of the influence of the water passages on such machines. The way how the power plant owner has to operate its Francis machines, many times also determined by a central dispatcher, has a high influence on the fatigue life time of the machine components. The diagnostic method presented in this report helps one to understand the importance of adequate operation to allow a low maintenance cost for the entire power plant. The method how to acquire these quantities is discussed in details together with the importance of correct sensor balancing, calibration and adequate correlation with the physical quantities. Typical results of the dynamic machine behavior, with adequate interpretation, obtained in recent measurement campaigns of some important hydraulic turbines were presented. The paper highlights the investigation focus of the hydraulic machine behavior and how to tailor the measurement strategy to accomplish all goals. Finally some typical recommendations based on the experience obtained on previous diagnostic reports of Francis turbines are performed in order to allow a better and safe operation of these power plant units.
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Weng, Ze Yu, Shao Heng Hu, Nan Nan Zhang, Hong Gang Ding, and Hong Wu You. "Dynamic Analysis of CNC Gantry Surface Grinder by Finite Element Method." Advanced Materials Research 102-104 (March 2010): 339–43. http://dx.doi.org/10.4028/www.scientific.net/amr.102-104.339.
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The dynamic characteristics of the grinding machines have an impact on its machining quality and cutting efficiency. In this paper, through the analysis of the structural features of the Large CNC gantry surface grinding machine, the finite element model of structure of the grinder was established on the base of the simplified machine structure, on which carried out its dynamics analysis, obtaining the modal parameters of the orders under different mode shapes. The effect on the dynamic characteristics of machine tools was analyzed under different mode shapes, then the weak link of the surface grinding machine was given, and then how to improve the structural design weakness of surface grinding machine was discussed, all of which provided theoretical basis for improvemental design for the structure of the large CNC gantry surface grinding machine.
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Podymaka, Valeriy. "DYNAMIC CONDITIONS OF COMPENSATED SYNCHRONOUS MACHINE." Science Journal Innovation Technologies Transfer, no. 2019-4 (September 1, 2019): 76–82. http://dx.doi.org/10.36381/iamsti.4.2019.76-82.
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The dynamic behavior of synchronous machine with longitudinal-transverse excitement by maintenance of the rotor overhang corner as equal zero are considered. The given condition is named as compensated and correspond with full compensation of transverse armature reaction by magnetizing force of transverse excitement winding. In such machine is absented the limit of steady-state overload, but active and reactive components of load current are concurrent as projections of load current image vector on orthogonal axes of machine inductor. The research aim is a determination of steady-state stability criterion of compensated synchronous machine working on powerful electrical system. The researches are organized in assumption of inductor current invariance and at neglect of stator windings time constant. The electromagnetic moment expression of longitudinal-transverse excitement synchronous machine in compensated work condition is received as a result of analysis of the spatial vector diagrams and equations. The expression analysis has allowed to find the criterion of rotor creepage stability and to examine the steady-state stability of the machine in different work conditions. It is shown that machines stability factor is defined by not only the reactive power of machine short circuit, but also associated reactive power.
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Dinc, O. S., R. Cromer, and S. J. Calabrese. "Redesigning Mechanical Systems for Low Wear Using System Dynamics Modeling." Journal of Tribology 118, no. 2 (April 1, 1996): 415–22. http://dx.doi.org/10.1115/1.2831318.
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This work describes a method of minimizing wear and extending the life of machinery components and large, complex machine structures by controlling the overall system dynamics. The method consists of the following steps: first, developing a system dynamics model for the entire machine structure using available rigid multi-body dynamic analysis computer codes; second, obtaining dynamic performance data from the system dynamics model for each sliding contact in the actual machine, and feeding this information into a suitable wear model which is either being used or developed for the particular material combination; third, matching the results of the wear prediction with actual machine wear inspection data; and last and most important, returning to the dynamic analysis model and modifying or redesigning the machine to minimize the intensity of the system dynamics, thus extending the wear life of the components. The method is being developed for application to large, complex machines which have numerous sliding contacts. Many of these contacts are at junctions between subcomponents assembled together. These junctions are often designed to accommodate relative motion due to vibration or thermal mismatches. After the initial analyses have been done, both minor and major mechanical design and material changes must be investigated to determine how effectively these could reduce wear. Each successive configuration can be evaluated using the dynamic analysis model. Application of this approach to the mechanical design of a gas turbine combustor reduced the noise level of the entire system and tripled the average machine life.
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Lee, Sang Won, Rhett Mayor, and Jun Ni. "Dynamic Analysis of a Mesoscale Machine Tool." Journal of Manufacturing Science and Engineering 128, no. 1 (June 21, 2005): 194–203. http://dx.doi.org/10.1115/1.2123007.
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Miniaturized machine tools, referred to as mesoscale machine tools (mMTs) henceforth, have been proposed as a way to manufacture micro/mesoscale mechanical components. A thorough study of the dynamic behavior of the mMT is required for the successful development of its machine structure. This paper demonstrates the development of an mMT, the performance evaluation of its mesoscale milling process, and the characterization of its dynamic behavior. The mMT is developed by using an air turbine spindle and three piezoelectric linear stages, and its volumetric size is 150×70×140mm. A series of micro/mesoscale milling experiments are conducted, and the performances in the developed mMT testbed are evaluated. The dynamic characteristics of the mMT can be different from those of conventional machine tools because the mMT is a miniaturized structure and comprises different machine components. Therefore, the effect of the miniaturization of a structure on the change of its dynamic behavior, called scaling law of the structural dynamics, is studied numerically and experimentally. The dynamic characteristics of the developed mMT that are estimated from the scaling law of the structural dynamics are much different from those obtained from an experimental modal analysis, and the flexible joints of the developed mMT are mainly responsible for this significant difference. Therefore, the joint dynamics of the mMT are studied by introducing an equivalent lumped parameter model, thus enabling simple identification of the joint dynamics and the effective modification of its critical joints to enhance a machining performance.
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Ercoli, Liberto, and Salvador La Malfa. "The Development of a Dynamic Balancing Machine." International Journal of Mechanical Engineering Education 26, no. 2 (April 1998): 149–55. http://dx.doi.org/10.1177/030641909802600207.
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A prototype of a dynamic balancing machine has been developed and put to use in the mechanical engineering laboratory of the Faculty. The goal of this project is twofold: first, to cooperate with the Mechanical Engineering Department in offering to industry balancing services for industrial rotors and, secondly, to promote the teaching of static and dynamic, analytical and experimental balancing techniques in both graduate and undergraduate courses. The machine consists of a non-conventional mechanical system presenting some constructive and methodological advantages with respect to the conventional machines. The results achieved when balancing industrial rotors with the prototype are similar to those obtained with the commercial machines available.
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Panda, Anton, Volodymyr Nahornyi, Jozef Mihok, Iveta Pandová, and Daniela Onofrejová. "DYNAMIC MODEL MILLING MACHINE." Acta Simulatio 5, no. 2 (June 30, 2019): 1–6. http://dx.doi.org/10.22306/asim.v5i2.47.
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Dickmanns, Ernst Dieter, and Volker Graefe. "Dynamic monocular machine vision." Machine Vision and Applications 1, no. 4 (December 1988): 223–40. http://dx.doi.org/10.1007/bf01212361.
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Chen, Fu Chen, Shang Chen Wu, and Yung Cheng Chen. "Crank Arrangement on the Dynamics of a Quadruped Walking Machine." Applied Mechanics and Materials 764-765 (May 2015): 213–17. http://dx.doi.org/10.4028/www.scientific.net/amm.764-765.213.
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The purpose of this study is to investigate the effect of crank arrangement on the dynamics of a quadruped walking machine. The dynamic characteristics of the walking machine, including the stance leg sequence, pitch angle and dynamic response of the quadruped walking machine are investigated and compared with the existing design. The results show that the phrase angle between front and rear legs on the same side should be 0o or 90o and the one between the legs on the different sides should be 180o. The results of this study can serve as a reference for future design and optimization of quadruped walking machines.
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Shuraiji, Ahlam Luaibi. "The effect of static and dynamic eccentricities on the performance of flux reversal permanent magnet machine." International Journal of Power Electronics and Drive Systems (IJPEDS) 11, no. 2 (June 1, 2020): 634. http://dx.doi.org/10.11591/ijpeds.v11.i2.pp634-640.
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This study investigates the effect of static and dynamic eccentricities on the performances of flux reversal permanent magnet (FRPM) machine with even rotor pole number, i.e. FRPM machine with 12/10 stator/rotor combination. No-load and load performances of the machine are investigated under three rotor operating conditions including centricity, static eccentricity and dynamic eccentricity. The investigation has been carried out using 2D-FEA. It has been revealed that the 12/10 FRPM machine under normal operating condition has no unbalanced magnetic force, due to the even pole number of the rotor. On the other hand, such undesirable feature would be presented in the 12/10 FRPM machine as a result of the existing of static and dynamic eccentricities. Both static and dynamic eccentric machines exhibit unbalanced three-phase flux linkage as well as back-EMF. Moreover, three operating conditions of the investigated machine have the same fundamental cogging torque harmonic. However, low order harmonics are existed in the static and dynamic centric machines and are not found in the centric machine. Furthermore, about 16% less torque ripple delivered by the centric machine compared with both static and dynamic counterparts.
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Chen, Ke Ming. "Design on Framework for Dynamic Monitoring of Virtual Machines." Applied Mechanics and Materials 530-531 (February 2014): 667–70. http://dx.doi.org/10.4028/www.scientific.net/amm.530-531.667.
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In order to ensure that the cloud platform client runtime kernel virtual machine security, this paper proposes a new framework for dynamic monitoring of virtual machines, it is for the kernel rootkit attacks, study the cloud client virtual machine operating system kernel safety, presented Hyperchk virtual machine dynamic monitoring framework. This framework mainly for kernel rootkit attacks, ensure that customers running virtual machine kernel security.
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FIADEIRO, JOSÉ, ANTÓNIA LOPES, BENOÎT DELAHAYE, and AXEL LEGAY. "Dynamic networks of heterogeneous timed machines." Mathematical Structures in Computer Science 28, no. 6 (May 24, 2017): 800–855. http://dx.doi.org/10.1017/s0960129517000135.
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We present an algebra of discrete timed input/output automata that may execute in the context of different clock granularities – which we call timed machines; this algebra includes a refinement operator through which a machine can be extended with new states and transitions in order to accommodate a finer clock granularity as required to interoperate with other machines, and an extension of the traditional product of timed input–output automata to the situation in which the granularities of the two machines are not the same. Over this algebra, we then define an algebra of networks of timed machines that includes operations through which networks can be modified at run time, thus offering a model for systems of interconnected components that can dynamically bind to other systems and, therefore, cannot be adjusted at design time to ensure that they operate in a timed homogeneous setting. We investigate important properties of timed machines such as consistency – in the sense that a machine can be ensured to generate a non-empty language, and feasibility – in the sense that a machine can be ensured to generate a non-empty language no matter what inputs it receives, and propose techniques for checking if timed machines are consistent or are feasible. We generalise those properties to networks of timed machines, and investigate how consistency and feasibility of networks can be proved through properties that can be checked at design time without having to compute, at run time, the product of the machines that operate on those networks, which would not be practical.
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Zhang, Nan Nan, Ze Yu Weng, Yan Qin Zheng, and Yong Cai. "Study on Dynamic Design Technique of Machine Tools Structure Based on Energy Balance." Advanced Materials Research 139-141 (October 2010): 792–96. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.792.
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The energy balance of system is one of the basis for the dynamic design of machine tools structure. The paper applied finite element technique to machine tools dynamic design based on the energy balance, in view of finite element model of machine tools dynamics structure, mean squared deviation of various energy distribution was used to describe the structural dynamic characteristics quantitatively, and the method was combined with structural dynamic optimal theory to establish the improvemental direction. The author applied the technique to the structural dynamic characteristics analysis of a surface grinder, through the energy distribution analysis and quantitative analysis of structural dynamic characteristics of the grinding machine tools, the weak link of the grinding machine structure was found, which had instruction function for structure optimization of the grinding machine.The result proved this structure dynamics design technique had obvious superiority.
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Vitayasak, Srisatja, Pupong Pongcharoen, and Christian Hicks. "Robust machine layout design under dynamic environment: Dynamic customer demand and machine maintenance." Expert Systems with Applications: X 3 (September 2019): 100015. http://dx.doi.org/10.1016/j.eswax.2019.100015.
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Guoyuan, Ma, Yan Qisen, and Yu Yongzhang. "Dynamic Behavior of Twin-Piece Vane Machine." Journal of Mechanical Design 124, no. 1 (May 1, 2000): 74–78. http://dx.doi.org/10.1115/1.1401455.
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This paper describes a twin-piece vane machine which has freely movable double vanes assembled in each slot machined in the rotor providing double seal lines between the vane tips and the inner surface of the cylinder. Analysis of the motion, forces, friction, wear and stresses in the vanes with a dynamic model demonstrates that the twin-piece vane machine has decreased the binding forces, friction losses and wear on the vane tip, but increased vane stresses. The results also indicate that most of the friction loss occurs at the vane tip with additional friction loss on the vane sides. The viscous loss caused by the oil film between the double vanes is so small that it can be neglected in engineering calculations. The ratio of the upper vane thickness to the lower vane thickness is one of the most important parameters for the twin-piece vane machine. Analysis of the influence of this ratio on the forces, friction, wear and strength of the vanes was used to optimize the thickness ratio for the twin-piece vane machine.
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Yang, Fei, and Lei Zhao. "Study on Auto Control System of No Decoupling Dynamic Compaction Machine." Applied Mechanics and Materials 536-537 (April 2014): 1191–94. http://dx.doi.org/10.4028/www.scientific.net/amm.536-537.1191.
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This paper introduces the current development of dynamic compaction machine at home and abroad and the basic structure of no decoupling dynamic compaction machine. Besides, The design scheme of no decoupling dynamic compaction machines brake control system is focused on putting forward in order to achieve automatic ramming without decoupling and without artificial hook. This kind of dynamic compaction machine with the advantage of simple structure, convenient operation and high efficiency effectively reduces the construction cost.
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Zhang, Xiao Dong, and Jin Jin Zhang. "Dynamic Design of Six-Station Automatic Hydraulic Stretching Machine." Key Engineering Materials 522 (August 2012): 256–59. http://dx.doi.org/10.4028/www.scientific.net/kem.522.256.
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Hydraulic stretch forming is a very important technology. Punch press has achieved multi-station automatic processing in the press area, which has greatly improved the efficiency. However, the main domestic stretching machine is single-stretching hydraulic machine at present. Compared with punch press, hydraulic stretching machines take less space and have better security, but they make less efficiency and have lower degree of automation. Hence, in order to take the advantage of hydraulic stretching machines and enhance the automation level, studies on multi-position automatic stretching machine occupies an important position. This paper proposes a design scheme of Six-station Automatic Hydraulic Stretching Machine (SAHSM) according to the practical production. The overall 3D structure of SAHSM is designed based on Solidworks to prove the theoretical possibility of the program. Then modal analysis is operated based on FEA of the key components of stretching machine module to improve reliability of the product and overcome the disadvantage of the traditional checking method, the first two-order modes are obtained to prove the impossibility of the resonance. At last, ADAMS-based virtual prototype is analyzed to demonstrate the feasibility and effectiveness of the SAHSM dynamic design proposed in this paper
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Jomartov, A. A., S. U. Joldasbekov, and Yu M. Drakunov. "Dynamic synthesis of machine with slider-crank mechanism." Mechanical Sciences 6, no. 1 (April 2, 2015): 35–40. http://dx.doi.org/10.5194/ms-6-35-2015.
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Abstract. In this paper we consider the formulation and solution of the task of a dynamic synthesis machine with an asynchronous electric motor and a slider-crank mechanism. The constant parameters of the slider-crank mechanism (mass and moments of inertia and centers of gravity of links) and the parameters of the electrical motor are defined. The laws of motion of the machine and kinematic parameters of the mechanism are considered as given. We have developed the method of optimal dynamic synthesis of the machine, which consists of an asynchronous electric motor and a slider-crank mechanism. The criterion of optimization of the dynamic synthesis of a machine is the root mean square sum of the moments of driving forces, the forces of resistance and inertia forces which are reduced to the axis of rotation of the crank. The method of optimal dynamic synthesis of a machine can be used in the design of new and the improvement of known mechanisms and machines.
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URAOKA, Akihiro, and Christopher D. RAHN. "3201 Dynamic Behavior of a Sheet in a Feeding Machine." Proceedings of the JSME annual meeting 2007.5 (2007): 305–6. http://dx.doi.org/10.1299/jsmemecjo.2007.5.0_305.
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Law, Mohit, Hendrik Rentzsch, and Steffen Ihlenfeldt. "Predicting mobile machine tool dynamics by experimental dynamic substructuring." International Journal of Machine Tools and Manufacture 108 (September 2016): 127–34. http://dx.doi.org/10.1016/j.ijmachtools.2016.06.006.
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Li, Yu, Qi Chen Wang, and Yin Ming Ge. "Milling Machine Spindle Dynamic Analysis." Advanced Materials Research 819 (September 2013): 43–47. http://dx.doi.org/10.4028/www.scientific.net/amr.819.43.
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This paper uses the FE (finite element) and experimental hybrid modeling method to establish the dynamic model of the spindle system. Calculate and analyze how static stiffness, span, and cantilever length affects mode frequency and mode shapes. Analyze the effect of the flywheel on dynamic performance based on harmonic respond. Moreover, the effect of the flywheel is well testified by experiment.
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Ung, David, and Cristina Cifuentes. "Machine-adaptable dynamic binary translation." ACM SIGPLAN Notices 35, no. 7 (July 2000): 41–51. http://dx.doi.org/10.1145/351403.351414.
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Allcock, James, and Epi Postma. "Understanding dynamic milking machine tests." Livestock 18, no. 2 (March 2013): 24–29. http://dx.doi.org/10.12968/live.2013.18.2.24.
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Chen, Hao, Tianlei Wang, Jiuwen Cao, Pierre-Paul Vidal, and Yimin Yang. "Dynamic Quaternion Extreme Learning Machine." IEEE Transactions on Circuits and Systems II: Express Briefs 68, no. 8 (August 2021): 3012–16. http://dx.doi.org/10.1109/tcsii.2021.3067014.
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Hwang, Yunn Lin, Thi Na Ta, and Cao Sang Tran. "Dynamic Analysis and Control of Hydraulic Machine System and Industrial Robotic Manipulators." Applied Mechanics and Materials 883 (July 2018): 1–7. http://dx.doi.org/10.4028/www.scientific.net/amm.883.1.
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Dynamic control on hydraulic machine system and kinematic control on industrial robotic manipulators are two studied topics in this research. The main objective of this study is to analyze dynamic, forward kinematic and inverse kinematic on a couple of mechanical systems and hydraulic mechanical systems in order to control these machines. The characteristics of hydraulic and manipulator robot parameters are firstly calculated by using dynamic theories. In the former topic, we perform an example on CNC machine tools which is designing a hydraulic controller to move a cutting tool along a circular path. Dynamics analysis, forward kinematics and inverse kinematics of industrial robotic are archived in the latter topic. Two experiments were also performed on RRR and RRRRRR manipulators by analyzing the inverse kinematic equations to make these robots follow the desired trajectories. This study takes innovations and achieves control improvement in different systems with optimization controller or trajectory planning.
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Zhang, Yimin, Qiaoling Liu, and Bangchun Wen. "Dynamic Research of a Nonlinear Stochastic Vibratory Machine." Shock and Vibration 9, no. 6 (2002): 277–81. http://dx.doi.org/10.1155/2002/734102.
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This paper presents the dynamics problems of stochastic vibratory machine systems. The random responses of the vibratory machine systems with stochastic parameters subjected to random excitation are researched using a stochastic perturbation method. The numerical results are obtained. The dynamic characteristics of nonlinear stochastic vibratory machine are analyzed.
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Li, Ke, Bo Yu, Zhaoyao Shi, Zanhui Shu, and Rui Li. "Development of gear dynamic performance testing machine." International Journal of Metrology and Quality Engineering 12 (2021): 20. http://dx.doi.org/10.1051/ijmqe/2021017.
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With the development of gears towards high temperature, high pressure, high speed and high stress, gear measurement, in which only the static geometric accuracy is considered, is unable to meet the current application requirements. While, the low precision and single function gear tester constrains the measurement of gear dynamic performance. For the resolution of this problem, based on the principle of gear system dynamics and several precision mechanical design techniques, a gear dynamic testing machine has been developed, providing new instruments for gear testing. On the basis of research of the principle of dynamic performance test, the primary measurement items of the testing machine have been determined. The measuring principles of each item and the driving and loading form of the testing machine have been examined. The measurement and control system of the testing machine and its corresponding software have been developed. The instrument can not only obtain the static precision index of the gear, but also obtain the dynamic performance index of the gear in variable working conditions. According to the actual test, the uncertainty of instrument is 3.8 μm and the external disturbance caused by the shaft vibration is less than 0.6 μm, which can meet the 5–6 grade precision gear testing requirement.
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El Baradie, M. A. "Statistical Analysis of the Dynamic Cutting Coefficients and Machine Tool Stability." Journal of Engineering for Industry 115, no. 2 (May 1, 1993): 205–15. http://dx.doi.org/10.1115/1.2901651.
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Machine tool chatter is a statistical phenomenon since it is dependent on the interaction of two statistical quantities, these being the dynamic characteristics of the machine tool structure and the transfer function of the cutting process. In this paper, a generalized statistical theory of machine tool chatter has been developed. This takes into consideration the scatter of the dynamic data of the machine structure and/or that of the cutting process. The dynamics of the cutting process have been represented by a mathematical model which derives the cutting coefficients from steady state cutting data, based on a nondimensional analysis of the cutting process. The dynamics of the machine tool structure and the cutting process, being the input data to the theory, were determined experimentally. The predicted stability charts were plotted to take into consideration the scatter in the machine structure dynamics and/or the cutting process. At the threshold of stability, the statistical variations due to the dynamic cutting coefficients amount to ±29.5 percent at 99 percent confidence level, while the statistical variations due to the structure dynamics amount to ±4.5 percent only, at the same confidence level. Therefore, the threshold of stability can be specified only in terms of mean values with confidence limits.
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SUN, YU, and WEI ZHANG. "STUDYING ENERGY-ORIENTED DYNAMIC OPTIMIZATIONS IN JAVA VIRTUAL MACHINES." Journal of Circuits, Systems and Computers 18, no. 01 (February 2009): 103–20. http://dx.doi.org/10.1142/s021812660900496x.
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Virtual machines have been increasingly used in embedded and mobile devices. Limited processing power and energy resources become a major challenge for modern virtual machines. The traditional virtual machines running on server computers also face the similar requirement to reduce energy dissipation. To address these challenges, a number of research works have been done in the area of energy-oriented dynamic optimization in Java Virtual Machines (JVM). Some of them focus on virtual machine directed hardware optimizations, while others exploit pure software approaches on virtual machine or compiler to reduce energy consumption. Additionally, client/server framework among multiple processors is also used to offload power-consuming tasks from low-power devices. This paper surveys the current progress of energy-oriented dynamic optimizations in JVMs.
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Ji Chan, Yum. "Improvements to Linear and Nonlinear Models of Machine Key Components." Impact 2021, no. 1 (February 5, 2021): 15–17. http://dx.doi.org/10.21820/23987073.2021.1.15.
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Precision machinery has come a long way over the years. Factories that once relied on manpower now use machines, and this development has brought with it innumerable benefits including improvements to accuracy, repeatability, productivity and efficiency. Naturally, though, machines are imperfect in that precision of a batch of machines vary slightly. On top of that, machines experience wear and tear or even break-downs. These unpredictable events can be costly to manufacturers. This is why research to better understand factors that affect a machine's precision is important. This knowledge can be used to reduce the issues that occur with machine tools and thereby maximise the efficiency and quality of production. This is the goal of Dr Yum-Ji Chan, Department of Mechanical Engineering, National Chung Hsing University, Taiwan. His research on vibration engineering, structural dynamics and the dynamics of rotors is seeking to better understand machine tools and, in doing so, improve their performance. He believes more research is required to understand the behaviour of specific components in machine tools, and he is seeking to fill this gap in knowledge. This involves understanding the vibration phenomena that occur in components in machine tools and, to do so, Chan and his team are producing accurate dynamic behaviour in machine tool models. This will, in turn, enable researchers to develop virtual machine tools that can monitor the condition of machines.
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Kabaldin, Yu G., D. A. Shatagin, M. S. Anosov, and A. M. Kuzmishina. "Development of digital twin of CNC unit based on machine learning methods." Vestnik of Don State Technical University 19, no. 1 (April 1, 2019): 45–55. http://dx.doi.org/10.23947/1992-5980-2019-19-1-45-55.
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Introduction. It is shown that the digital twin (electronic passport) of a CNC machine is developed as a cyber-physical system. The work objective is to create neural network models to determine the operation of a CNC machine, its performance and dynamic stability under cutting.Materials and Methods. The development of mathematical models of machining processes using a sensor system and the Industrial Internet of Things is considered. Machine learning methods valid for the implementation of the above tasks are evaluated. A neural network model of dynamic stability of the cutting process is proposed, which enables to optimize the machining process at the stage of work preparation. On the basis of nonlinear dynamics approaches, the attractors of the dynamic cutting system are reconstructed, and their fractal dimensions are determined. Optimal characteristics of the equipment are selected by input parameters and debugging of the planned process based on digital twins.Research Results. Using machine learning methods allowed us to create and explore neural network models of technological systems for cutting, and the software for their implementation. The possibility of applying decision trees for the problem of diagnosing and classifying malfunctions of CNC machines is shown.Discussion and Conclusions. In real production, the technology of digital twins enables to optimize processing conditions considering the technical and dynamic state of CNC machines. This provides a highly accurate assessment of the production capacity of the enterprise under the development of the production program. In addition, equipment failures can be identified in real time on the basis of the intelligent analysis of the distributed sensor system data.
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Aktas, Ahmet, Serhat Aydin, and Mehmet Kabak. "CNC router selection under dynamic fuzzy environment." Journal of Intelligent & Fuzzy Systems 39, no. 5 (November 19, 2020): 6259–69. http://dx.doi.org/10.3233/jifs-189094.
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To cut several types of hard materials in manufacturing, Computer Numeric Control (CNC) router machines are commonly used. The tasks to be done by different machines can be performed by a single CNC router machine. Production of parts with better quality is possible at lower costs by production with CNC router machines, and these machines improve the productivity of manufacturing system. For these reasons, determination of the appropriate CNC router machine for manufacturing systems is a crucial decision. Different factors related to properties of machines are effective on the decision. Therefore, decision makers must include different effective aspects into decision process. Under this consideration, an analytic selection procedure for CNC router machines by taking uncertain expressions of experts on the selection criteria and variable values occur over time is proposed in this study. In order to handle the modelling difficulty of uncertainty of the statements and the value changes by time, dynamic intuitionistic multi attribute decision making is used to select the best CNC router. Applicability of the proposed selection procedure is demonstrated on an application, and a comparative analysis with dynamic neutrosophic multi attribute decision making is presented.
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Ma, Fu Dong, Yao Gang Li, and Qian Lin Peng. "Modeling Research for Active Control of Coupled Vibration between Multiple CNC Milling Machines and Flexible Foundation." Applied Mechanics and Materials 105-107 (September 2011): 675–79. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.675.
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In real life many agencies are using the flexible foundation as a base of support, such as ship hull or deck, the chassis of car, and machine tools work on stairs. With the traditional theory, the mathematical model between machine and based simplified as single-degree-of-freedom, assuming foundation is a rigid, and many investigate for a single machine, ignoring the dynamic coupling of base and the coupling characteristics between vibrators. This paper build a dynamics model with flexible basis and multiple machines, it’s multi-degrees-of-freedom model. The foundation is flexibled. On this basis builiding a model about multiple machines, flexible foundation and vibration isolation system. This paper resolve to the problem of the machine work on stair, research the system include vibrator, actuators, and flexible foundation. Using Lagrange equation deduce dynamics equation. Express every factor in eqution,deduced the state and space expression.Take prepare for optimal and system simulation.
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Zhang, Yao Man, Ren Jun Gu, and Guang Xiao Yang. "Static and Dynamic Characteristic Analysis for the HSR Series Linear Motion Guide." Advanced Materials Research 834-836 (October 2013): 1488–92. http://dx.doi.org/10.4028/www.scientific.net/amr.834-836.1488.
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The dynamic characteristic of junction surface is an important part of the dynamic characteristics of NC machine tools, and it is sometimes the weakest link of the machine tool's dynamic characteristics. The precision of the finite element calculation of the machine tool's dynamic characteristics shall be affected by the junction surface parameters directly. Linear Motion guide is one of the most widely used components of the NC machine tool, and its characteristic is one of the most important components of the performances of the NC machine tool. The HSR series of linear motion guides are taken as the object of the paper, and its static and dynamic characteristics are studied. And the parameters of static and dynamic characteristics of HSR, such as static stiffness, natural frequency and modal shape are obtained. The accuracy of the finite element analysis mode is verified, which establishes the foundation for the dynamics analysis of machine tool.
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Walid Ibrahim Alnusirat, Litvin Оleksandr, Ibrahim Farhan Alrefo, and Kravez Оleksandr. "TOOL FOR RESEARCHING THE DYNAMIC SYSTEM OF METAL-CUTTING MACHINE." World Science, no. 9(37) (September 30, 2018): 5–9. http://dx.doi.org/10.31435/rsglobal_ws/30092018/6128.
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Dynamic characteristics of the system flexibility of the machine affect the accuracy of machining, so the study of this problem is very important. Fluctuations of the machine elements significantly affect the error of the shape of the workpiece. The quality of the processing is determined not so much by the static displacements between the tool and the workpiece but the stability of the machine system as a whole. There are many solutions of vibroacoustic diagnostics devices for machines and machine-tools in the related publications. Defects in the spectrum of vibroacustic signals are found in the process of manufacturing and assembling machines in the form of discrete components, parameters of which are used in vibroacoustic diagnostics as informative diagnostic features. Along with that there is, but not so common, another type of dynamic system analysis of the machine, which can be carried out by experimental methods, or, in particular, by simulating the perturbation of a dynamic system by cutting forces of special type. Imitated disturbance is carried out by using a tool of a special form. During the processing cutting edges of the tool create a pseudorandom process with certain statistical characteristics, in particular, the correlation function. The proposed design of the tool makes it possible to perform the research of frequency parameters of the dynamic system of the machine without complex loading devices.
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Karthikeyan, P., and M. Chandrasekaran. "Dynamic Programming Inspired Virtual Machine Instances Allocation in Cloud Computing." Journal of Computational and Theoretical Nanoscience 14, no. 1 (January 1, 2017): 551–60. http://dx.doi.org/10.1166/jctn.2017.6362.
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Cloud computing provides virtual machines instances to the user for performing various computational tasks on demand for a specific period of time. Considering the architecture and characteristics of the cloud environments, traditional virtual machine instances allocation algorithms cannot be applied to the cloud environment appropriately. In this paper, we propose Dynamic programming inspired virtual machine instances allocation algorithm which allocates virtual machine instances to the user based on demand. The aim of this algorithm is to maximize the cloud provider’s revenue. We have mainly focused on the total revenue generation of the cloud provider and percentage of user served rather than focusing on running time and space complexity of the virtual machine instances allocation problem. We evaluate the proposed mechanism by performing simulations. The experimental results show that the proposed Dynamic programming inspired virtual machine instances allocation method provided a higher revenue generation for the cloud provider than traditional fixed price and combinatorial auction greedy virtual machine instances allocation method.
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Miao, Cuixia, and Juan Zou. "Parallel-Machine Scheduling with Time-Dependent and Machine Availability Constraints." Mathematical Problems in Engineering 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/956158.
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We consider the parallel-machine scheduling problem in which the machines have availability constraints and the processing time of each job is simple linear increasing function of its starting times. For the makespan minimization problem, which is NP-hard in the strong sense, we discuss the Longest Deteriorating Rate algorithm and List Scheduling algorithm; we also provide a lower bound of any optimal schedule. For the total completion time minimization problem, we analyze the strong NP-hardness, and we present a dynamic programming algorithm and a fully polynomial time approximation scheme for the two-machine problem. Furthermore, we extended the dynamic programming algorithm to the total weighted completion time minimization problem.
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Hu, Yuan Sheng, Qiang Li, and Yan Zhi Guan. "The Measurement and Analysis System Development of 3D Roll Forming Machine Dynamic Characteristics Based on Virtual Instrument." Advanced Materials Research 889-890 (February 2014): 726–31. http://dx.doi.org/10.4028/www.scientific.net/amr.889-890.726.
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For the study dynamic characteristics of three-dimensional roll forming machine, this paper develops a dynamic characteristics measurement and analysis system of three-dimensional roll forming machine, which is based on the U.S. NI company software development platform, including the development of hardware and software part .The realization of dimensional roll forming machine dynamics parameters collection and analysis, the experiment proved that the test system can be easily field measurements demand dynamics parameters, to improve the three-dimensional roll forming machine precision and control accuracy to provide an experimental basis.
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Ivshin, Igor Vladimirovich, Andrey Michailovich Kopylov, and Alfred Robertovich Safin. "Numerical Modeling of Dynamic Processes of the Reciprocating Reversible Electrical Machine." Applied Mechanics and Materials 792 (September 2015): 134–42. http://dx.doi.org/10.4028/www.scientific.net/amm.792.134.
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Now rotational electrical machines are used mainly for the implementation a reciprocating motion of working mechanisms and also as the electric generators powered by internal combustion engines. It is achieved by means of the kinematic transfers complicating a design and reducing the drive efficiency. The use of linear reciprocating electric machines allows to eliminate these defects. It should be noted that the most effective ones are the cylindrical designs of reciprocating electric machines with permanent magnets, whose efficiency reaches 93 – 95%. However, the rarity and lack of a mass production of this machine type and special recommendations for their design causes the need of research, directed on search of optimum constructive decisions. The article describes the types of linear electrical machines and summarizes the results of numerical modeling of dynamic characteristics for the three versions of the reciprocating cylindrical machine with permanent magnets of 10 kW with the oscillation frequency of the translator 20 Hz and the length of operating cycle of 120 mm. The most effective design parameters of linear electric machine were determined on the basis of its specific characteristics and analysis of the EMF graphics shape, appearing on the stator windings in the generator mode.
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Li, Xiao Peng, Ya Min Liang, Guang Hui Zhao, Xing Ju, Hao Tian Yang, and Quan Bin Wang. "Dynamic Characteristics of Machine-Pile-Soil Vibration System with Interface Friction Coupling." Materials Science Forum 773-774 (November 2013): 632–39. http://dx.doi.org/10.4028/www.scientific.net/msf.773-774.632.
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The efficiency of vibrating machines will be greatly improved with the proper working parameters. A new type of hydraulic vibration pile driver extractor is presented in this paper. The machine-pile-soil dynamic model of the hydraulic vibration pile driver extractor based on frictional forces and vibration coupling is established with frictional forces of the pile-soil contact surface and the resistance force of the pile-end. Furthermore, the nonlinear dynamical characteristics of the dynamic model are studied and the influences of different system working parameters on frictional forces of pile-soil interface, working efficiency and capability are discussed by numerical simulation. The different working parameters are exciting force, frequency and stiffness. The results show that the suitable parameters of the vibrating machine can change the soil characteristics and decrease the frictional forces of the pile-soil interface. The work can provide useful guidance for the research on the vibration friction, selection in the suitable parameters of interface surface in engineering and design in the development of such machines.
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Sira, Natalia, Antonina Kolohoida, Oleksandr Lytvyn, and Dmytro Kalchenko. "DEFINITION OF DYNAMIC CHARACTERISTICS GRINDING OF CYLINDRICAL AND NEEDLE ROLLER SURFACE OF A TEXTILE MACHINE." Technical Sciences and Technologies, no. 2(16) (2019): 44–53. http://dx.doi.org/10.25140/2411-5363-2019-2(16)-44-53.
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Urgency of the research. In the process of fabricating fabrics, various types of aggregates are used in the textile industry, such as crocheting, crocheting and others. Their working part is the drums and rollers covered with card headset. The quality of the work surface of the card headset is subject to high requirements, since the occurrence of an error in the craft drum or roller of the textile unit causes the formation of an uneven gap between the working elements and, accordingly, the release of the poor-quality product. And not a satisfactory condition of the working surface of the needles causes a gap in the material, which also increases the percentage of the gap. Target setting. Given the large dimensions of the drums and rollers of textile machines, as well as the slight stiffness of the headset, the dynamic impact on the accuracy of the processing has a significant impact. Actual scientific researches and issues analysis. Various aspects of the theory of fluctuations of rigid structures are investigated, which allows us to use an analytical approach to many practical cases. The main issues of the dynamics of metal-cutting machine tools are considered: equivalent and elastic systems, working processes, stability of the dynamic system, stationary and transitional processes. The data on the closed dynamical system of the machine, the indicators of dynamic quality are given. The methods of finishing a grinding of smooth cylindrical and sharpening of needle surfaces of drums and rollers of textile machines are offered. Uninvestigated parts of general matters defining. However, the study of dynamic characteristics in the process of finishing grinding cylindrical and needle surfaces of drums and rollers of textile machines was not conducted. Research of dynamic characteristics of the grinding process of cylindrical and needle surfaces of drums and rollers of textile machines, and determination of dynamic properties of elements of the processing system. The statement of basic materials. The value of the initial deflection of the needles as a result of their impact on the surface of the grinding wheel at the time of entry into the processing zone was determined. A spatial model of the needle was constructed and its frequency analysis in the Solidworks system was performed. Since the processing of textile rollers is proposed to be carried out on the grinding machine VZ-208F3, a modal analysis of its spindle assembly was also carried out. In the experimental study, the amplitude-phase-frequency characteristic is constructed. Conclusions. Through the computer spatial modeling, the first five self-oscillation frequencies were determined, as well as the corresponding oscillation patterns for the needle of the card headset and for the spindle knot of the machine VZ- 208F3. Experimental way is the amplitude-phase-frequency characteristic of the spindle.
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Agarwal, Praveen, Amandeep Singh, and Adem Kilicman. "Development of key-dependent dynamic S-Boxes with dynamic irreducible polynomial and affine constant." Advances in Mechanical Engineering 10, no. 7 (July 2018): 168781401878163. http://dx.doi.org/10.1177/1687814018781638.
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In recent years, the need to develop advanced information technology systems in the area of mechanical engineering has been growing continuously to deliver better product quality at reduced cost. Embedding the electronics and software with machines transform them into smart machines sophistically called mechatronic. These software-oriented machines collect big data using sensors and other electronics and share among other smart machines, which further helps them in controlling the manufacturing processes, decision-making, and even in maintenance. Machine-to-machine sharing of data involves the risk of data stealing or modification, which may further disrupt the working of manufacturing process and leads to poor quality product. For data security, block ciphers like advanced encryption standard are needed. Advanced encryption standard is an encryption algorithm which is widely used to provide security to sensitive information by organizations. The main core of advanced encryption standard is its non-liner component that is S-Box, which is also called substitution table. The S-Box provides confusion capabilities in algorithm. The point of interest for cryptanalysis and hackers is S-Box, which is fixed in case of advanced encryption standard. Cryptanalysis and hackers exploit this weakness of advanced encryption standard. Many researchers tried to modify S-Box using different techniques. In this article, we tried to create dynamic S-Boxes which are key-dependent and, at the same time, they are using dynamic irreducible polynomial and affine constant.
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Rahman, Shafiq U., Amber Sultan, Roobaea Alroobaea, Muhammad Talha, Syed B. Hussain, and Muhammad A. Raza. "Secure OFDM-Based NOMA for Machine-to-Machine Communication." Wireless Communications and Mobile Computing 2021 (May 18, 2021): 1–8. http://dx.doi.org/10.1155/2021/6615767.
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Machine-to-machine communication (M2M) has obtained increasing interest in recent years. However, its enhancement and broadcasting characteristics produced a new security challenge. We have suggested a novel dynamic Quadrature Amplitude Modulation (QAM) scheme for a totally elastic and dynamic mapping of user data by using chaos. This paper analyses physical layer security methods in Orthogonal Frequency Division Multiplexing-based Nonorthogonal Multiple Access (OFDM-NOMA) and introduces a secure data transmission mechanism created by dynamic QAM. The security robustness given by the suggested encryption scheme is assessed, where an overall keyspace of ~ 10 163 is achieved, which is sufficient to provide security against exhaustive attacks. The result of the scheme is verified through MATLAB simulation, where the bit error rate performance of our proposed scheme is compared with an unencrypted OFDM signal, and the performance of our proposed scheme is analyzed for an illegal user. The suggested dynamic mapping fulfills the fundamental obligations of cryptography for data security. Moreover, it enhances the level of security in OFDM-NOMA.
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Wang, Ke, Guang Lv, and Xing Wei Sun. "Analyzing of Dynamic Characteristics of Special CNC Machine Tool." Applied Mechanics and Materials 29-32 (August 2010): 2037–41. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.2037.
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The dynamic characteristics of machine tool is an important factor, which make affect on the cutting stability of machine tool. The poor dynamic characteristics will seriously affect the stability of cutting, make the low cutting efficiency and low machining precision, and also accelerate the wear of tools and even reduce the machine’s service life. So it is necessary to analyze the dynamic characteristics of machine tool, and according to the results of analysis to optimize structural parameters and motion parameters of the machine tools. This paper analyses the dynamic characteristics of machine bed and machined work piece of the CNC special machine tool for Kelly with the finite element software, and analysis of excitation characteristics of cutting tool. It also makes optimization design to the machine bed, through the analysis and optimization, the natural frequency and stiffness will be obviously improved. According to the structure and calculation of the motion parameters we can get the exciting force frequency to workpiece when it is cut, using interlocking tooth cutting method to replace the initial symmetrical cutting method in order to avoid the resonance produced in the cutting process and improve stability. The exciting frequency when cutting can be improved and the probability of resonance when cutting is lowered. All these ensure high efficiency and high stability cutting.
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Nguyen, Loc Huu, and Thuy Van Tran. "Advances in the dynamic characteristics of high -speed machine structure." Science and Technology Development Journal 20, K5 (August 31, 2017): 73–80. http://dx.doi.org/10.32508/stdj.v20ik5.1162.
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The quality of machining is dependent on the machine’s dynamic behavior throughout the operating process. Because of the loads or vibration during operation, the rigidity of the machine structure can be reduced. Therefore, the study of advances in the dynamic characteristics has great significance for the development of machine tools, especially for high-speed machines. This paper presents the design and analysis of a rigid gantry structure with a spindle speed in the range of (6.000 ÷ 24.000)rpm, corresponding to the natural frequency of the machine structure more than (100 ÷ 400)Hz. Use CAE (computer-aided engineering) analysis software to analyze the natural frequency of machine structure. The research results show that the machine structure will have good stiffness, high vibration resistance and avoid resonance to achieve the best machining surface. In addition, it is the basis for selection of cutting mode suitable for the machining process in order to improve the reliability and efficiency of work of the machine structure and the accuracy of the processed products.
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Жмурин, В. В., and А. В. Анцев. "INFLUENCE OF TOOLING SYSTEM ACCURACY ON DYNAMIC CHARACTERISTICS OF MULTI-PURPOSE MACHINE." ВЕСТНИК ВОРОНЕЖСКОГО ГОСУДАРСТВЕННОГО ТЕХНИЧЕСКОГО УНИВЕРСИТЕТА, no. 2 (May 11, 2021): 113–19. http://dx.doi.org/10.36622/vstu.2021.17.2.018.
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Рассмотрена характерная для современного машиностроения тенденция по увеличению концентрации технологических операций на многоцелевых станках и интенсификации режимов резания. Приведен анализ станочных парков различных металлообрабатывающих предприятий, который показал преобладание станков фрезерно-расточной группы. Проанализированы причины широкой номенклатуры инструментальной системы станков фрезерно-расточной группы и рассмотрено влияние многообразия инструментальной системы на динамические характеристики многоцелевых станков. Рассмотрен пример характерной для станков фрезерно-расточной группы среднего типоразмера инструментальной системы, которая включает в себя цанговый патрон, цангу и фрезу. Приведены расчеты точности и жесткости для различных вариантов инструментальной системы. С целью подтверждения полученных теоретических расчетов были проведены экспериментальные исследования в условиях реального производства при обработке серийно изготавливаемой детали типа «Корпус» на фрезерном многоцелевом станке модели VMC-600. Результаты обработки экспериментальных данных показали, что точность инструментальной системы значительно влияет на геометрическую точность обработанной детали, виброустойчивость инструментальной системы и ее жесткость. Низкая точность инструментальной системы приводит к значительному отжиму режущего инструмента на рекомендуемых режимах резания, который может превысить величину допуска на обработку, что должно быть учтено на этапе проектирования технологического процесса путем занижения режимов резания The article discusses the characteristic tendency of modern mechanical engineering to increase the concentration of technological operations on multi-purpose machine tools and intensify cutting modes. We give the analysis of machine parks of various metalworking enterprises, which showed the prevalence of milling and boring machines. This article analyzes the reasons for a wide range of tool systems for milling-boring machines and considers the influence of the diversity of the tool system on the dynamic characteristics of multi-purpose machines. We considered an example of a medium-sized tool system typical for milling and boring machines, which includes a collet chuck, a collet and a milling cutter. We give calculations of accuracy and stiffness for various versions of the instrumental system. In order to confirm the obtained theoretical calculations, we carried out experimental studies in real production conditions when processing a serially manufactured part on a VMC-600 multi-purpose milling machine. The results of experimental data processing showed that the accuracy of the tool system significantly affects the geometric accuracy of the machined part, vibration resistance of the tool system and its rigidity. The low accuracy of the tool system leads to a significant squeezing out of the cutting tool at the recommended cutting conditions, which can exceed the machining tolerance, which should be taken into account at the design stage of the technological process by understating the cutting conditions