Journal articles: 'Dynamic Type System'

1

Han, Ning, and Qingjie Cao. "Multiple Bifurcations of a Cylindrical Dynamical System." Journal of Theoretical and Applied Mechanics 46, no. 1 (March 1, 2016): 33–52. http://dx.doi.org/10.1515/jtam-2016-0003.

Full text

Abstract:

Abstract This paper focuses on multiple bifurcations of a cylindrical dynamical system, which is evolved from a rotating pendulum with SD oscillator. The rotating pendulum system exhibits the coupling dynamics property of the bistable state and conventional pendulum with the ho- moclinic orbits of the first and second type. A double Andronov-Hopf bifurcation, two saddle-node bifurcations of periodic orbits and a pair of homoclinic bifurcations are detected by using analytical analysis and nu- merical calculation. It is found that the homoclinic orbits of the second type can bifurcate into a pair of rotational limit cycles, coexisting with the oscillating limit cycle. Additionally, the results obtained herein, are helpful to explore different types of limit cycles and the complex dynamic bifurcation of cylindrical dynamical system.

APA, Harvard, Vancouver, ISO, and other styles

2

Yonezawa, Takuo, and Yukiyoshi Kameyama. "A Type System for Dynamic Delimited Continuations." IPSJ Digital Courier 4 (2008): 182–92. http://dx.doi.org/10.2197/ipsjdc.4.182.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Bui, Van-Phuoc, and Young-Bok Kim. "A Study on the Development of Dynamic Positioning System for Barge Type Surface Vessels." Journal of the Korea Society For Power System Engineering 16, no. 2 (April 30, 2012): 66–74. http://dx.doi.org/10.9726/kspse.2012.16.2.066.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Abadi, M., L. Cardelli, B. Pierce, and D. Rémy. "Dynamic typing in polymorphic languages." Journal of Functional Programming 5, no. 1 (January 1995): 111–30. http://dx.doi.org/10.1017/s095679680000126x.

Full text

Abstract:

AbstractThere are situations in programming where some dynamic typing is needed, even in the presence of advanced static type systems. We investigate the interplay of dynamic types with other advanced type constructions, discussing their integration into languages with explicit polymorphism (in the style of system F), implicit polymorphism (in the style of ML), abstract data types, and subtyping.

APA, Harvard, Vancouver, ISO, and other styles

5

Won, Jang-Seok, Seongnam-si, Hui-Su Jang, and Goyang-si. "DYNAMIC TYPE UNIT WITH MULTIPLE MAGNETIC FIELD SYSTEM." Journal of the Acoustical Society of America 132, no. 4 (2012): 2767. http://dx.doi.org/10.1121/1.4757771.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

WAKUI, Tetsuya, Takahiro HASHIKAWA, Ryohei YOKOYAMA, and Takashi KANEKO. "ICOPE-15-1075 Dynamic Cycle Simulation of a Multi-split Type Electric Air-Conditioning System for Buildings." Proceedings of the International Conference on Power Engineering (ICOPE) 2015.12 (2015): _ICOPE—15——_ICOPE—15—. http://dx.doi.org/10.1299/jsmeicope.2015.12._icope-15-_55.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Wang, Dawei, Hongbo Zou, and Jili Tao. "A new design of fractional-order dynamic matrix control with proportional–integral–derivative-type structure." Measurement and Control 52, no. 5-6 (April 29, 2019): 567–76. http://dx.doi.org/10.1177/0020294019843939.

Full text

Abstract:

Most dynamic systems in practice are of fractional order and often the models using fractional-order equations can grasp their intrinsic properties with more accuracy compared with conventional differential equations. In this paper, a fractional-order modeling-based proportional–integral–derivative-type dynamic matrix control is developed and tested on a typical industrial heating furnace system with fractional-order dynamics. The Oustaloup approximation method is first adopted to obtain the model approximation of the processes, which paves the way for the application of integer order dynamic matrix control to the fractional-order systems. Meanwhile, a set of proportional–integral–derivative-type operators are introduced in the cost function to further optimize the dynamic matrix control in terms of tracking and disturbance-rejection performance. The resulting controller bears both the merits of the dynamic matrix control and the proportional–integral–derivative, and thus improved control performance is obtained. In addition, an industrial heating furnace process system is given to test the performance of the proposed method in comparison with traditional integer order model-based dynamic matrix control, and results show that the proposed method gives improved system performance.

APA, Harvard, Vancouver, ISO, and other styles

8

Kupershlyak-Yuzefovich, G. M. "Dynamic errors in a resistance-type strain-measuring system." Strength of Materials 21, no. 9 (September 1989): 1254–60. http://dx.doi.org/10.1007/bf01529308.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Ohno, Y. "Dynamic Roadway Lighting Measuring System with Split Type Photocells." Journal of the Illuminating Engineering Society 16, no. 2 (July 1987): 137–51. http://dx.doi.org/10.1080/00994480.1987.10748694.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Klein, Helen Altman, and Katherine D. Lippa. "Type 2 Diabetes Self-Management: Controlling a Dynamic System." Journal of Cognitive Engineering and Decision Making 2, no. 1 (March 2008): 48–62. http://dx.doi.org/10.1518/155534308x284363.

Full text

Abstract:

People with type 2 diabetes risk disability and early death when they fail to control their blood glucose levels. Despite advances in medicine, pharmacology, human factors, and education, dangerous glucose levels remain endemic. To investigate cognitive barriers to control, we observed American Diabetes Association (ADA) certified training programs; reviewed ADA and National Institute of Health diabetes Web sites; and interviewed patients with type 2 diabetes using a critical decision method. A consistent picture emerged. The prevailing rules and procedures approaches are not preparing patients for the dynamic control task they face. Patients are often unable to understand and use the rules and procedures provided. They are unprepared to detect problems, make sense of dynamic relationships, and manage complex situations. Our results suggest that glucose self-regulation is better conceptualized as a dynamic control challenge requiring complex processes, including problem detection, sensemaking, decision making, and planning/replanning. The mismatch between most patient training and the dynamic demands of glucose regulation helps explain limitations in existing training and poor patient outcomes. We argue that constructs gleaned from naturalistic decision-making research in other complex domains can help many but not all patients develop the cognition necessary for effective blood glucose self-management.

APA, Harvard, Vancouver, ISO, and other styles

11

Parovik, Roman, Zafar Rakhmonov, and Rakhimzhon Zunnunov. "Modeling of fracture concentration by Sel’kov fractional dynamic system." E3S Web of Conferences 196 (2020): 02018. http://dx.doi.org/10.1051/e3sconf/202019602018.

Full text

Abstract:

Microseismic phenomena are studied by a Sel’kov generalized nonlinear dynamic system. This system is mainly applied in biology to describe substrate and product glycolytic oscillations. Thus, Sel’kov dynamic system can also describe interaction of two types of fractures in an elastic-friable medium. The first type includes seed fractures with lower energy and the second type are large fractures which generate microseisms. The first type of fractures are triggers for the second type of fractures. However opposite transition is possible. For example, when large fractures lose their energy and partially become seed ones. After their concentration increase, the process repeats providing auto oscillation character of microseism sources. Generalization of Sel’kov dynamic system is its analogue which is based on hereditarity. Hereditarity is studied within hereditary mechanics and it shows that a dynamic system can “remember” for some time the impact which was made upon it. It is typical for viscoelastic and yielding mediums. The Sel’kov generalized dynamic system will be called Sel’kov fractional dynamic system as long as from the point of view of mathematical description, it can be represented in the form of a system of differential equations with fractional derivatives. Fractional derivative orders are associated with system hereditarity and are responsible for energy dissipation intensity emitted by first- and second-type fractures. In the paper, the Sel’kov fractional dynamic model was numerically solved by Adams-Bashforth-Moulton method. Oscillo-grams and phase trajectories were plotted. It was shown that fractional dynamic model may have relaxation and damped oscillations.

APA, Harvard, Vancouver, ISO, and other styles

12

Saadaoui, Kheir, Brahim Bouderah, Ouarda Assas, and Mohammed Khodja. "Type-1 and Type-2 fuzzy Sets to Control a Nonlinear Dynamic System." Revue d'Intelligence Artificielle 33, no. 1 (May 1, 2019): 1–7. http://dx.doi.org/10.18280/ria.330101.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Daneshpour, Negin, and Ahmad Abdollahzadeh Barfourosh. "Dynamic View Management System for Query Prediction to View Materialization." International Journal of Data Warehousing and Mining 7, no. 2 (April 2011): 67–96. http://dx.doi.org/10.4018/jdwm.2011040104.

Full text

Abstract:

On-Line Analytical Processing (OLAP) systems based on data warehouses are the main systems for managerial decision making and must have a quick response time. Several algorithms have been presented to select the proper set of data and elicit suitable structured environments to handle the queries submitted to OLAP systems, which are called view selection algorithms to materialize. As users’ requirements may change during run time, materialization must be viewed dynamically. In this work, the authors propose and operate a dynamic view management system to select and materialize views with new and improved architecture, which predicts incoming queries through association rule mining and three probabilistic reasoning approaches: Conditional probability, Bayes’ rule, and Naïve Bayes’ rule. The proposed system is compared with DynaMat system and Hybrid system through two standard measures. Experimental results show that the proposed dynamic view selection system improves these measures. This system outperforms DynaMat and Hybrid for each type of query and each sequence of incoming queries.

APA, Harvard, Vancouver, ISO, and other styles

14

Browne, Sid, and Uri Yechiali. "Dynamic priority rules for cyclic-type queues." Advances in Applied Probability 21, no. 02 (June 1989): 432–50. http://dx.doi.org/10.1017/s0001867800018620.

Full text

Abstract:

A cyclic service system is composed of K channels (queues) and a single cyclically roving server who typically takes a positive amount of time to switch between channels. Research has previously focused on evaluating and computing performance measures (notably, waiting times) of fixed template routing schemes under three main service disciplines, the exhaustive, gated and limited service regimes. In this paper, probabilistic results are derived that allow control strategies and optimal policies to be considered for the first time. By concentrating on a new objective function, we are able to derive rules of index form amenable for direct implementation to dynamically control the system at suitably defined decision epochs. These rules utilize current system information, are of an adaptive nature, and are shown to emanate from a general physical principle.

APA, Harvard, Vancouver, ISO, and other styles

15

Browne, Sid, and Uri Yechiali. "Dynamic priority rules for cyclic-type queues." Advances in Applied Probability 21, no. 2 (June 1989): 432–50. http://dx.doi.org/10.2307/1427168.

Full text

Abstract:

A cyclic service system is composed of K channels (queues) and a single cyclically roving server who typically takes a positive amount of time to switch between channels. Research has previously focused on evaluating and computing performance measures (notably, waiting times) of fixed template routing schemes under three main service disciplines, the exhaustive, gated and limited service regimes.In this paper, probabilistic results are derived that allow control strategies and optimal policies to be considered for the first time. By concentrating on a new objective function, we are able to derive rules of index form amenable for direct implementation to dynamically control the system at suitably defined decision epochs. These rules utilize current system information, are of an adaptive nature, and are shown to emanate from a general physical principle.

APA, Harvard, Vancouver, ISO, and other styles

16

Mehar, Pramod Kumar, and Mrs Madhu Upadhyay. "Power System Stability Study on Multi Machine Systems having DFIG Based Wind Generation System." SMART MOVES JOURNAL IJOSCIENCE 6, no. 3 (March 10, 2020): 27–30. http://dx.doi.org/10.24113/ijoscience.v6i3.279.

Full text

Abstract:

Power system stability is related to principles of rotational motion and the swing equation governing the electromechanical dynamic behavior. In the special case of two finite machines the equal area criterion of stability can be used to calculate the critical clearing angle on the power system, it is necessary to maintain synchronism, otherwise a standard of service to the consumers will not be achieved. With the increasing penetration of doubly fed induction generators (DFIGs), the impact of the DFIG on transient stability attracts great attention. Transient stability is largely dominated by generator types in the power system, and the dynamic characteristics of DFIG wind turbines are different from that of the synchronous generators in the conventional power plants. The analysis of the transient stability on DFIG integrated power systems has become a very important issue. This paper is a review of three types of stability condition. The first type of stability, steady state stability explains the maximum steady state power and the power angle diagram. There are several methods to improve system stability in which some methods are explained.

APA, Harvard, Vancouver, ISO, and other styles

17

DU, Zixue, Zhen YANG, Zhouzhou XU, Junchao ZHOU*, and Zhongwei HOU. "The Study on Nonlinear Model of Pantograph-catenary Coupling system for Straddle-type Monorail." Mechanics 26, no. 3 (June 18, 2020): 212–20. http://dx.doi.org/10.5755/j01.mech.26.3.24287.

Full text

Abstract:

Based on the Lagrange equation, the linear and nonlinear dynamic models of straddle monorail pantograph considering the lateral vibration of bogie are derived. On this basis, the lateral coupling dynamic model of pantograph-catenary is established. Newmark method is used to solve the pantograph-catenary coupling dynamic model. In order to evaluate the applicability of the two models，this paper analyzed the contact force response of two model with different speeds. The reasearch show that when the speed is below 40 km/h, the contact forces of nonlinear model and linear model can reflects the lateral excitation of the finger plate. When the speed exceeds 40 km/h, only the nonlinear model can reflect the lateral excitation of finger palte, the nonlinear pantograph-catenary coupling dynamics model is more suitable to the straddle-type monorail pantograph-catenary coupling research.

APA, Harvard, Vancouver, ISO, and other styles

18

Zhang, Yan, Xiaoli Chu, Yang Liu, and Yongqiang Liu. "A Modelling and Control Approach for a Type of Mixed Logical Dynamical System Using in Chilled Water System of Refrigeration System." Mathematical Problems in Engineering 2019 (March 20, 2019): 1–12. http://dx.doi.org/10.1155/2019/7131380.

Full text

Abstract:

The chilled water system of central air conditioning is a typical hybrid system. The dynamic adjustment of cooling capacity based on hybrid system can achieve accurate temperature control and real-time energy saving. Mixed logical dynamical (MLD) systems have advantage for solving constrained optimization problems of this type of case by numerical methods. This paper proposes a novel modified type of MLD system, which enhances the model applicability and improves the switching flexibility and control effect for the framework. In order to meet the needs of cooling capacity and energy saving, the optimal control problem is transformed as MIQP problem by defined performance index. As a numeral example of application, the model and control method is used in pumps group control for variable water volume in chilled water system of central air conditioning. At last, the dynamic and energy-saving effects of the system are simulated, which shows the ideal control results.

APA, Harvard, Vancouver, ISO, and other styles

19

Vyaznikov, M. V., and A. M. Vyaznikov. "Investigation of dynamic lo dynamic loading of the traveling system of track-type tractor." IOP Conference Series: Materials Science and Engineering 709 (January 3, 2020): 022109. http://dx.doi.org/10.1088/1757-899x/709/2/022109.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Kyrychko, Y. N., K. B. Blyuss, A. Gonzalez-Buelga, S. J. Hogan, and D. J. Wagg. "Real-time dynamic substructuring in a coupled oscillator–pendulum system." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 462, no. 2068 (January 24, 2006): 1271–94. http://dx.doi.org/10.1098/rspa.2005.1624.

Full text

Abstract:

Real-time dynamic substructuring is a powerful testing method, which brings together analytical, numerical and experimental tools for the study of complex structures. It consists of replacing one part of the structure with a numerical model, which is connected to the remainder of the physical structure (the substructure) by a transfer system. In order to provide reliable results, this hybrid system must remain stable during the whole test. A primary mechanism for destabilization of these type of systems is the delays which are naturally present in the transfer system. In this paper, we apply the dynamic substructuring technique to a nonlinear system consisting of a pendulum attached to a mechanical oscillator. The oscillator is modelled numerically and the transfer system is an actuator. The system dynamics is governed by two coupled second-order neutral delay differential equations. We carry out local and global stability analyses of the system and identify the delay dependent stability boundaries for this type of system. We then perform a series of hybrid experimental tests for a pendulum–oscillator system. The results give excellent qualitative and quantitative agreement when compared to the analytical stability results.

APA, Harvard, Vancouver, ISO, and other styles

21

Bykov, I. S. "Functioning of discrete dynamic circulant-type system with threshold functions." Prikladnaya diskretnaya matematika, no. 26 (December 1, 2014): 84–95. http://dx.doi.org/10.17223/20710410/26/10.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

ZHU, Changsheng. "DYNAMIC BEHAVIOUR OF SHEAR-TYPE MAGNETORHEOLOGIC GREASE DAMPER ROTOR SYSTEM." Chinese Journal of Mechanical Engineering 42, no. 10 (2006): 91. http://dx.doi.org/10.3901/jme.2006.10.091.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Dai, Ji Shuang, Peng Zhang, Chao Feng Li, Bo Wang, and Bang Chun Wen. "Study on Dynamic Response of Assembly Type Gear-Rotor System." Advanced Engineering Forum 2-3 (December 2011): 912–17. http://dx.doi.org/10.4028/www.scientific.net/aef.2-3.912.

Full text

Abstract:

The dynamic model of a rotor system of assembled compressor is established. Based on the single axis analysis, and considering the tilting-pad bearing stiffness characteristics with speed variations, the paper analyses whole system’s nature characteristic with gearing mesh factors. It mainly expands with the form of amplitude-frequency drawing and spectrum charts, and examines the dynamic response with each key position of coupled systems under the two working conditions. The results show that, because of the existence of gear meshing effect, Low speed axis and high-speed axis in the corresponding speed shaft appeared a few larger vibration amplitudes, at high speed axis add unbalance force, can arouse resonance of this axis in the first two order critical speed, but in the other axis don’t have obvious display.

APA, Harvard, Vancouver, ISO, and other styles

24

Ravikiran, T. "Simulation and Analysis of Adaptive Power System Type Dynamic Loads." International Journal for Research in Applied Science and Engineering Technology 6, no. 3 (March 31, 2018): 85–93. http://dx.doi.org/10.22214/ijraset.2018.3014.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Campos, Manuel, David A. Cisneros, Mangayarkarasi Nivaskumar, and Olivera Francetic. "The type II secretion system – a dynamic fiber assembly nanomachine." Research in Microbiology 164, no. 6 (July 2013): 545–55. http://dx.doi.org/10.1016/j.resmic.2013.03.013.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Klimenok, Valentina, Alexander Dudin, Olga Dudina, and Irina Kochetkova. "Queuing System with Two Types of Customers and Dynamic Change of a Priority." Mathematics 8, no. 5 (May 19, 2020): 824. http://dx.doi.org/10.3390/math8050824.

Full text

Abstract:

The use of priorities allows us to improve the quality of service of inhomogeneous customers in telecommunication networks, inventory and health-care systems. An important modern direction of research is to analyze systems in which priority of a customer can be changed during his/her stay in the system. We considered a single-server queuing system with a finite buffer, where two types of customers arrive according to a batch marked Markov arrival process. Type 1 customers have non-preemptive priority over type 2 customers. Low priority customers are able to receive high priority after the random amount of time. For each non-priority customer accepted into the buffer, a timer, which counts a random time having a phase type distribution, is switched-on. When the timer expires, the customer with some probability leaves the system unserved and with the complimentary probability gains the high priority. Such a type of queues is typical in many health-care systems, contact centers, perishable inventory, etc. We describe the behavior of the system by a multi-dimensional continuous-time Markov chain and calculate a number of the stationary performance measures of the system including the various loss probabilities as well as the distribution function of the waiting time of priority customers. The illustrative numerical examples giving insights into the system behavior are presented.

APA, Harvard, Vancouver, ISO, and other styles

27

Liang, Ming Xuan, and Hui Qun Yuan. "Study on Nonlinear Dynamic Characteristic of Gearbox Based on Explicit Dynamic." Applied Mechanics and Materials 318 (May 2013): 59–62. http://dx.doi.org/10.4028/www.scientific.net/amm.318.59.

Full text

Abstract:

Considering the drawbacks of existing dynamics research of gearbox system, the dynamic analysis method based on perfectly elastic body is presented. A certain type of marine gearbox is taken as investigation object based on Abaqus/Explicit dynamic finite element program, the dynamic contact nonlinear model of gearbox system is established considering the coupling effect of each component, dynamic simulation of the gearbox system is carried out. The results show that, in the gearbox coupling model, the coupling effects among the bearing, the housing and the gears cause the dynamic characteristic of the gear transmission system more complex, which exacerbates shock effect of the gearbox, the model which considered coupling among the components is closer to the real working condition. The research has certain reference value for gearbox dynamic characteristic optimization.

APA, Harvard, Vancouver, ISO, and other styles

28

Ertaş, Mehmet. "The dynamic magnetic behaviors of the Blume–Capel Ising bilayer system." Modern Physics Letters B 29, no. 35n36 (December 30, 2015): 1550236. http://dx.doi.org/10.1142/s021798491550236x.

Full text

Abstract:

The dynamic magnetic behaviors of the spin-1 Blume–Capel Ising bilayer system (BCIS) are studied in an oscillating external magnetic field on a two-layer square lattice by utilizing the mean field theory (MFT) based on Glauber-type stochastic dynamics [dynamic mean field theory (DMFT)]. The dynamic equations describing the time-dependencies of the average magnetizations are obtained with the Master equation. The dynamic phases in this system are found by solving these dynamic equations. The temperature dependence of the dynamic order parameters is examined to characterize the nature (continuous or discontinuous) of the phase transitions and to obtain the dynamic phase transition (DPT) points. The dynamic phase diagrams (DPDs) are shown for ferromagnetic/ferromagnetic, antiferromagnetic/ferromagnetic, antiferromagnetic/antiferromagnetic interactions in the plane of the reduced temperature versus magnetic field amplitude and they display dynamic tricritical and re-entrant behavior as well as the dynamic triple point (tp).

APA, Harvard, Vancouver, ISO, and other styles

29

Rieger, K., and K. Bouazza-Marouf. "Active Control of Dynamic Platforms." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 219, no. 8 (December 1, 2005): 551–63. http://dx.doi.org/10.1243/095965105x33662.

Full text

Abstract:

The control of a dynamic platform system for offshore operations in adverse weather conditions is discussed in this paper. The aim is to control the deck of the dynamic platform system to remain stationary irrespective of displacement-type base disturbances and force/ torque-type deck disturbances. Two control schemes based on the principle of invariance are described. Open-loop control, with drift cancellation, is implemented for the heave (vertical) motion, which is not always possible to obtain in practical systems. An experimental rig has been used to investigate and validate simulation results. Good simulation and experimental results have been obtained.

APA, Harvard, Vancouver, ISO, and other styles

30

Al-khedhairi, A., A. Elsonbaty, A. H. Abdel Kader, and A. A. Elsadany. "Dynamic Analysis and Circuit Implementation of a New 4D Lorenz-Type Hyperchaotic System." Mathematical Problems in Engineering 2019 (February 6, 2019): 1–17. http://dx.doi.org/10.1155/2019/6581586.

Full text

Abstract:

This paper attempts to further extend the results of dynamical analysis carried out on a recent 4D Lorenz-type hyperchaotic system while exploring new analytical results concerns its local and global dynamics. In particular, the equilibrium points of the system along with solution’s continuous dependence on initial conditions are examined. Then, a detailed Z2 symmetrical Bogdanov-Takens bifurcation analysis of the hyperchaotic system is performed. Also, the possible first integrals and global invariant surfaces which exist in system’s phase space are analytically found. Theoretical results reveal the rich dynamics and the complexity of system behavior. Finally, numerical simulations and a proposed circuit implementation of the hyperchaotic system are provided to validate the present analytical study of the system.

APA, Harvard, Vancouver, ISO, and other styles

31

Wang, Yanzhen, and Min Zhao. "Dynamic Analysis of an Impulsively Controlled Predator-Prey Model with Holling Type IV Functional Response." Discrete Dynamics in Nature and Society 2012 (2012): 1–18. http://dx.doi.org/10.1155/2012/141272.

Full text

Abstract:

The dynamic behavior of a predator-prey model with Holling type IV functional response is investigated with respect to impulsive control strategies. The model is analyzed to obtain the conditions under which the system is locally asymptotically stable and permanent. Existence of a positive periodic solution of the system and the boundedness of the system is also confirmed. Furthermore, numerical analysis is used to discover the influence of impulsive perturbations. The system is found to exhibit rich dynamics such as symmetry-breaking pitchfork bifurcation, chaos, and nonunique dynamics.

APA, Harvard, Vancouver, ISO, and other styles

32

Ładziński, Radosław. "Dynamic Systems with a Finite Degrees of Freedom Number." Archives of Control Sciences 24, no. 2 (June 1, 2014): 207–34. http://dx.doi.org/10.2478/acsc-2014-0013.

Full text

Abstract:

Abstract Taking as a starting point the law of conservation of the total energy of the system, and introducing two basic state functions - the Lagrangian and the Rayleigh function, the general form of the equation of motion for any dynamic system with a finite number of degrees of freedom is derived. The theory is illustrated by considering the rotating - type electromechanical energy converter with six degrees of freedom being the model of all essentially important types of DC and AC machines, including rotating power amplifiers, induction - and synchronous type motors - all of them discussed from both, the steady-state and the transient point of view. In the next part of the paper there is described a simple electric circuit with its model characterized by the holonomic constraints of the velocity-type. Finally, there is presented the kinematics and dynamics of the interesting mechanical system - the gyroscope placed on the rotating Earth.

APA, Harvard, Vancouver, ISO, and other styles

33

Ye, Xijun, Zhuo Sun, Xu Cai, and Liu Mei. "An Improved Step-Type Liquid Level Sensing System for Bridge Structural Dynamic Deflection Monitoring." Sensors 19, no. 9 (May 9, 2019): 2155. http://dx.doi.org/10.3390/s19092155.

Full text

Abstract:

Real-time and accurate monitoring of dynamic deflection is of great significance for health monitoring and condition assessment of bridge structures. This paper proposes an improved step-type liquid level sensing system (LLSS) for dynamic deflection monitoring. Layout of straight-line-type pipeline is replaced by step-type pipeline in this improved deflection monitoring system, which can remove the interference of the inclination angle on the measurement accuracy and is applicable for dynamic deflection monitoring. Fluid dynamics are first analyzed to demonstrate that measurement accuracy is interfered with by the fluid velocity induced by structural vibration, and ANSYS-FLOTRAN is applied for analyzing the influence range caused by the turbulent flow. Finally, a step-type LLSS model is designed and experimented with to verify the influence of the three key parameters (initial displacement excitation, step height, and distance from the measurement point to the elbow) on the measurement accuracy, and the reasonable placement scheme for the measurement point is determined. The results show that the measurement accuracy mainly depends on the turbulent flow caused by step height. The measurement error gets smaller after about 1.0 m distance from the elbow. To ensure that the measurement error is less than 6%, the distance between the measurement point and the elbow should be larger than 1.0 m.

APA, Harvard, Vancouver, ISO, and other styles

34

Wei, Jian Yu, Jian Lu, Qi Bin Liu, Feng Wu, and Feng Wang. "AMESim Concrete Pump Closed Type Hydraulic System Modeling and Simulation Research." Applied Mechanics and Materials 336-338 (July 2013): 668–71. http://dx.doi.org/10.4028/www.scientific.net/amm.336-338.668.

Full text

Abstract:

In order to analyze the dynamic characteristics of the concrete pump closed type hydraulic system in the process of pumping, we add two speed sensors and power units in the system, to achieve the dynamic loading of the pumping load by judging the main oil cylinder speed. We also establish the concrete pump closed type hydraulic system model for the dynamic simulation. The results show that in the process of pumping, pumping pressure keeps constant value and no pressure impact. Meanwhile the piston displacement linearity increases or decreases and the piston velocity keep the constant value.

APA, Harvard, Vancouver, ISO, and other styles

35

Shcherbak, Volodymyr, and Iryna Dmytryshyn. "Estimation of oscillation velocities of oscillator network." Proceedings of the Institute of Applied Mathematics and Mechanics NAS of Ukraine 32 (December 28, 2018): 182–89. http://dx.doi.org/10.37069/1683-4720-2018-32-17.

Full text

Abstract:

The study of the collective behavior of multiscale dynamic processes is currently one of the most urgent problems of nonlinear dynamics. Such systems arise on modelling of many cyclical biological or physical processes. It is of fundamental importance for understanding the basic laws of synchronous dynamics of distributed active subsystems with oscillations, such as neural ensembles, biomechanical models of cardiac or locomotor activity, models of turbulent media, etc. Since the nonlinear oscillations that are observed in such systems have a stable limit cycle , which does not depend on the initial conditions, then a system of interconnected nonlinear oscillators is usually used as a model of multiscale processes. The equations of Lienar type are often used as the main dynamic model of each of these oscillators. In a number of practical control problems of such interconnected oscillators it is necessary to determine the oscillation velocities by known data. This problem is considered as observation problem for nonlinear dynamical system. A new method – a synthesis of invariant relations is used to design a nonlinear observer. The method allows us to represent unknowns as a function of known quantities. The scheme of the construction of invariant relations consists in the expansion of the original dynamical system by equations of some controlled subsystem (integrator). Control in the additional system is used for the synthesis of some relations that are invariant for the extended system and have the attraction property for all of its trajectories. Such relations are considered in observation problems as additional equations for unknown state vector of initial oscillators ensemble. To design the observer, first we introduce a observer for unique oscillator of Lienar type and prove its exponential convergence. This observer is then extended on several coupled Lienar type oscillators. The performance of the proposed method is investigated by numerical simulations.

APA, Harvard, Vancouver, ISO, and other styles

36

Saha, S. K., S. V. Shah, and P. V. Nandihal. "Evolution of the DeNOC-based dynamic modelling for multibody systems." Mechanical Sciences 4, no. 1 (January 31, 2013): 1–20. http://dx.doi.org/10.5194/ms-4-1-2013.

Full text

Abstract:

Abstract. Dynamic modelling of a multibody system plays very essential role in its analyses. As a result, several methods for dynamic modelling have evolved over the years that allow one to analyse multibody systems in a very efficient manner. One such method of dynamic modelling is based on the concept of the Decoupled Natural Orthogonal Complement (DeNOC) matrices. The DeNOC-based methodology for dynamics modelling, since its introduction in 1995, has been applied to a variety of multibody systems such as serial, parallel, general closed-loop, flexible, legged, cam-follower, and space robots. The methodology has also proven useful for modelling of proteins and hyper-degree-of-freedom systems like ropes, chains, etc. This paper captures the evolution of the DeNOC-based dynamic modelling applied to different type of systems, and its benefits over other existing methodologies. It is shown that the DeNOC-based modelling provides deeper understanding of the dynamics of a multibody system. The power of the DeNOC-based modelling has been illustrated using several numerical examples.

APA, Harvard, Vancouver, ISO, and other styles

37

Zhan, Bing Lai, Yue Xu, Zhi Xu, and Xiqin Yang. "Dynamic Properties Analysis for Self-Anchored Suspension and Cable-Stayed Combination System Bridge." Advanced Materials Research 255-260 (May 2011): 1077–81. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.1077.

Full text

Abstract:

In view that dynamics research for self-anchored suspension and cable-stayed combination system bridge lags behind the practical application, this thesis analyzed its dynamic properties and seismic responses. By means of constructing a dynamic finite element model of the bridge for the dynamic properties and seismic response analysis, the thesis discovered the dynamic properties and the seismic responses laws of self-anchored suspension and cable-stayed combination system bridge. The dynamic finite element model was constructed based on the dynamic analysis theory and method, under the background of the first self-anchored suspension and cable-stayed combination system bridge in the world, and it was verifyed by on-site vibration test. The dynamic properties and the seismic responses laws provides a valuable reference for the design and maintenance of this type of bridge.

APA, Harvard, Vancouver, ISO, and other styles

38

Zixue, Du, Zhou Junchao, Yang Zhen, and Xu Zhouzhou. "Curving Performance of Straddle-Type Monorail Vehicle with Single-Axle Bogies Based on Spatial Multi-Body Dynamic Analysis." Mechanics 27, no. 2 (April 15, 2021): 148–54. http://dx.doi.org/10.5755/j02.mech.22930.

Full text

Abstract:

Straddle-type monorail ,as a unique technology, energy saving and environmental protection, is different from the subway of urban rail transit system. In order to study the curving performance of a new type of the straddle-type monorail vehicle with single-axle bogies ,the three-dimensional spatial dynamics model which consists of the vehicle model and track model designis proposed by the multi-body dynamics soft ADAMS. The monorail vehicle dynamic model which consists of three types of tire -track contact model and the nonlinear model of the horizontal stop is established. Based on the dynamic model, the influences such as pre pressure and curve super-high rate parameters of the curve passing for the dynamic characteristics are discussed. The simulation results show that the suitable preload for the guide and stabilizer tires of straddle-type vehicle with single-axle bogies is 5KN and after selecting the appropriate pre-pressure, the super-high rate is recommended to be 8%-10%.

APA, Harvard, Vancouver, ISO, and other styles

39

Zhou, Liangqiang, and Fangqi Chen. "Global Dynamics of an Elliptically Excited Pendulum Model." International Journal of Bifurcation and Chaos 30, no. 12 (September 30, 2020): 2050166. http://dx.doi.org/10.1142/s0218127420501667.

Full text

Abstract:

Using both analytical and numerical methods on the global dynamics, including the existence and uniqueness of solutions, subharmonic bifurcations and dynamic responses, of an elliptically excited pendulum model are investigated in this paper. The heteroclinic orbits, as well as periodic orbits with [Formula: see text] and [Formula: see text] types of unperturbed systems are obtained analytically. Chaotic vibrations arising from heteroclinic intersections are studied by means of the Melnikov method. The critical curves separating the chaotic and nonchaotic regions are plotted for different system parameters. The chaotic feature on the system parameter [Formula: see text], named the ratio between the horizontal and the vertical diameter of the upright ellipse traced out by the pivot during each period, is discussed in detail. The conditions for subharmonic bifurcations with the [Formula: see text] type or the [Formula: see text] type are also presented with the subharmonic Melnikov method. It is proved rigorously that the system can undergo chaotic motions through finite subharmonic bifurcations with the [Formula: see text] type. In addition, chaotic motions can occur through infinite subharmonic bifurcations with the [Formula: see text] type. An interesting dynamical phenomenon, i.e. “controllable frequency”, which decreases monotonically with the system parameter [Formula: see text], is presented. A number of related numerical simulations are given to confirm the analytical results.

APA, Harvard, Vancouver, ISO, and other styles

40

Brun, M., I. S. Jones, and A. B. Movchan. "Vortex-type elastic structured media and dynamic shielding." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 468, no. 2146 (May 30, 2012): 3027–46. http://dx.doi.org/10.1098/rspa.2012.0165.

Full text

Abstract:

The paper presents an approach to modelling a novel elastic metamaterial structure that possesses non-trivial dispersion features. A system of spinners has been embedded into a two-dimensional periodic lattice system. The analysis of the motion of the spinners is used to derive an expression for a ‘chiral term’ in the equations describing the dynamics of the lattice. Dispersion of elastic waves is shown to possess innovative filtering and polarization properties induced by the vortex-type nature of the structured media. The related effective behaviour in a continuous medium is implemented to build a shielding cloak around an obstacle. Analytical work is accompanied by numerical illustrations.

APA, Harvard, Vancouver, ISO, and other styles

41

Chen, Zi Li, Ao Ling Ma, Xiao Liang You, and Li Qun Shi. "Theoretical Research of the Active-Type Dynamic Vibration Absorbers." Advanced Materials Research 255-260 (May 2011): 1820–24. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.1820.

Full text

Abstract:

Active-type dynamic vibration absorbers (ADVA) is a kind of damping system, installed an actuators in the dynamic vibration absorbers (DVA). According to the actual needs, vibration energy of the structure is transferred to vibration absorbers actively in the process of structural vibration for the effect of external excitation. Therefore, the energy is decayed or transferred quickly and the structural vibration is controlled. If the nature frequency of additional system is the same as external excitation frequency of the original system, actuators doesn’t start and the whole system behaves the property of DVA (passive damping) .Otherwise, actuators starts, which makes the energy of original structure transfer to the vibration absorbers actively, achieving the purpose of energy consumed and vibration reduced. In this paper the concept of ADVA is proposed, and the working principle of ADVA is theoretically analyzed, furthermore the expressions of the system vibration response and active control coefficient are deduced. The curves of active control force and structure amplitude against incentive frequency are plotted respectively by examples.

APA, Harvard, Vancouver, ISO, and other styles

42

Xue, Yakui, and Xiafeng Duan. "The Dynamic Complexity of a Holling Type-IV Predator-Prey System with Stage Structure and Double Delays." Discrete Dynamics in Nature and Society 2011 (2011): 1–19. http://dx.doi.org/10.1155/2011/509871.

Full text

Abstract:

We invest a predator-prey model of Holling type-IV functional response with stage structure and double delays due to maturation time for both prey and predator. The dynamical behavior of the system is investigated from the point of view of stability switches aspects. We assume that the immature and mature individuals of each species are divided by a fixed age, and the mature predator only attacks the mature prey. Based on some comparison arguments, sharp threshold conditions which are both necessary and sufficient for the global stability of the equilibrium point of predator extinction are obtained. The most important outcome of this paper is that the variation of predator stage structure can affect the existence of the interior equilibrium point and drive the predator into extinction by changing the maturation (through-stage) time delay. Our linear stability work and numerical results show that if the resource is dynamic, as in nature, there is a window in maturation time delay parameters that generate sustainable oscillatory dynamics.

APA, Harvard, Vancouver, ISO, and other styles

43

Nojiri, K., S. Suzaki, K. Takenaka, and M. Goto. "Modal reduced dynamic equivalent model for analog type power system simulator." IEEE Transactions on Power Systems 12, no. 4 (1997): 1518–23. http://dx.doi.org/10.1109/59.627851.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Zhang, Xiao-Hang, Qian-Qian Bao, Yan Zhang, Ming-Che Su, Cui-Li Cui, and Jin-Hui Wu. "Dynamic control of retrieval contrast in a Λ-type atomic system." Chinese Physics B 21, no. 5 (May 2012): 054209. http://dx.doi.org/10.1088/1674-1056/21/5/054209.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

MIZUNO, Takeshi, Shinsuke SATO, and Yuji ISHINO. "Vibration-Type Mass Measurement System with an Undamped Dynamic Vibration Absorber." Transactions of the Japan Society of Mechanical Engineers Series C 68, no. 665 (2002): 37–43. http://dx.doi.org/10.1299/kikaic.68.37.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Seto, Takashi, Toshiyuki Uehara, and Yoshihiko Akaiwa. "Dynamic channel allocation in a reservation-type packet transmission cellular system." Electronics and Communications in Japan (Part I: Communications) 83, no. 10 (October 2000): 40–47. http://dx.doi.org/10.1002/(sici)1520-6424(200010)83:10<40::aid-ecja5>3.0.co;2-6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Hu, S. L. J., and M. Muin. "Dynamic Response Statistics of Linear System Under Morison-Type Wave Force." Journal of Offshore Mechanics and Arctic Engineering 112, no. 1 (February 1, 1990): 42–52. http://dx.doi.org/10.1115/1.2919834.

Full text

Abstract:

The primary objective of this study is to establish the non-normal relationship between Morison-type random wave loading and structural response via repeated Monte Carlo simulations. A standardized equation of motion will be developed, such that the numerical results can apply to various structures and sea states, instead of a particular structure or sea state. The reliability of the Monte Carlo simulation technique will also be investigated, analytically and experimentally.

APA, Harvard, Vancouver, ISO, and other styles

48

Della Penna, Giuseppe. "A type system for static and dynamic checking of C++ pointers." Computer Languages, Systems & Structures 31, no. 2 (July 2005): 71–101. http://dx.doi.org/10.1016/j.cl.2004.05.002.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

LIAO, BO, YUAN YAN TANG, and LU AN. "ON LORENZ-LIKE DYNAMIC SYSTEMS WITH STRENGTHENED NONLINEARITY AND NEW PARAMETERS." International Journal of Wavelets, Multiresolution and Information Processing 08, no. 02 (March 2010): 293–311. http://dx.doi.org/10.1142/s0219691310003456.

Full text

Abstract:

This paper introduces two types of Lorenz-like three-dimensional quadratic autonomous chaotic systems with 7 and 8 new parameters free of choice, respectively. Both systems are investigated at the equilibriums to study their chaotic characteristics. We focus our attention on the second type of the introduced system which consists of three nonlinear quadratic equations. Predictably, coordinates of the equilibriums are prohibitively complex. Therefore, instead of directly analyzing their stability, we prove the asymptotical characterization of equilibriums by utilizing our preliminary results derived for the first type of system. Our result shows that, though the coordinates of equilibriums satisfy a ternary quadratic, the system still contains only three equilibriums in circumstances of chaos. Sufficient conditions for the chaotic appearance of systems are derived. Our results are further verified by numerical simulations and the maximum Lyapunov exponent for several examples. Our research takes a first step in investigating chaos in Lorenz-like dynamic systems with strengthened nonlinearity and general forms of parameters.

APA, Harvard, Vancouver, ISO, and other styles

50

Zargartalebi, Ali, and Kourosh Heidari Shirazi. "Dynamic Modelling of Axle Tramp in a Sport Type Car." Shock and Vibration 20, no. 4 (2013): 711–23. http://dx.doi.org/10.1155/2013/213965.

Full text

Abstract:

One of the most significant dynamic aspects of coupled vibration of transmission system and dependent type suspension systems is axle tramp. The tramp is defined as undesirable oscillation of rigid live axle around roll axis. In spite of utilizing powerful engines in some type of sport cars, tramp occurrence causes loss of longitudinal performance. The aim of this paper is to derive a mathematical model for predicting and classifying of the tramp. A parameter study reveals that, some parameters such as engine torque, moving parts moment of inertia, car and wheels weight and the material used in suspension system play important role in controlling the tramp. It is shown that large difference between sprung and unsprung mass moment of inertia around the roll-axis, low vehicle mass, short rear track and medium damping values have significant effects on the severity of tramp.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Dynamic Type System'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles