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Nonlinear oscillations with parametric excitation solved by homotopy analysis method 被引量:5
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作者 Jianmin Wen Zhengcai Cao 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2008年第3期325-329,共5页
An analytical technique, namely the homotopy analysis method (HAM), is used to solve problems of nonlinear oscillations with parametric excitation. Unlike perturbation methods, HAM is not dependent on any small phys... An analytical technique, namely the homotopy analysis method (HAM), is used to solve problems of nonlinear oscillations with parametric excitation. Unlike perturbation methods, HAM is not dependent on any small physical parameters at all, and thus valid for both weakly and strongly nonlinear problems. In addition, HAM is different from all other analytic techniques in providing a simple way to adjust and control convergence region of the series solution by means of an auxiliary parameter h. In the present paper, a periodic analytic approximations for nonlinear oscillations with parametric excitation are obtained by using HAM, and the results are validated by numerical simulations. 展开更多
关键词 nonlinear oscillation Parametric excitation Series solutions Homotopy analysis method
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NONLINEAR TIME TRANSFORMATION METHOD FOR STRONG NONLINEAR OSCILLATION SYSTEMS 被引量:5
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作者 徐兆 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 1992年第3期279-288,共10页
In this paper,a nonlinear time transformation method is presented for the analysis of strong nonlinear oscillation systems.This method can be used to study the limit cycle behavior of the autonomous systems and to ana... In this paper,a nonlinear time transformation method is presented for the analysis of strong nonlinear oscillation systems.This method can be used to study the limit cycle behavior of the autonomous systems and to analyze the forced vibration of a strong nonlinear system. 展开更多
关键词 strong nonlinear oscillation nonlinear time transformation method
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Nonlinear Oscillations of Semigeostrophic Eady Waves in the Presence of Diffusivity 被引量:1
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作者 QinXU WeiGU 高守亭 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2005年第1期49-57,共9页
Analyses are performed to examine the physical processes involved innonlinear oscillations of Eady baroclinic waves obtained from viscous semigeostrophic models withtwo types of boundary conditions (free-slip and non-... Analyses are performed to examine the physical processes involved innonlinear oscillations of Eady baroclinic waves obtained from viscous semigeostrophic models withtwo types of boundary conditions (free-slip and non-slip). By comparing with previous studies forthe case of the free-slip boundary condition, it is shown that the nonlinear oscillations areproduced mainly by the interaction between the baroclinic wave and zonal-mean state (totalzonal-mean flow velocity and buoyancy stratification) but the timescale of the nonlinearoscillations is largely controlled by the diffusivity. When the boundary condition is non-slip, thenonlinear oscillations are further damped and slowed by the diffusive process. Since the free-slip(non-slip) boundary condition is the zero drag (infinite drag) limit of the more realistic dragboundary condition, the nonlinear oscillations obtained with the two types of boundary conditionsare two extremes for more realistic nonlinear oscillations. 展开更多
关键词 nonlinear oscillation semigeostrophic eady wave DIFFUSIVITY
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Nonlinear oscillation characteristics of magnetic microbubbles under acoustic and magnetic fields
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作者 赵丽霞 史慧敏 +3 位作者 Isaac Bello 胡静 王成会 莫润阳 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第3期329-341,共13页
Microbubbles loaded with magnetic nanoparticles(MMBs) have attracted increasing interests in multimode imaging and drug/gene delivery and targeted therapy. However, the dynamic behaviors generated in diagnostic and th... Microbubbles loaded with magnetic nanoparticles(MMBs) have attracted increasing interests in multimode imaging and drug/gene delivery and targeted therapy. However, the dynamic behaviors generated in diagnostic and therapeutic applications are not clear. In the present work, a novel theoretical model of a single MMB was developed, and the dynamic responses in an infinite viscous fluid were investigated under simultaneous exposure to magnetic and acoustic fields. The results showed that the amplitude reduces and the resonant frequency increases with the strength of the applied steady magnetic field and the susceptibility of the magnetic shell. However, the magnetic field has a limited influence on the oscillating. It is also noticed that the responses of MMB to a time-varying magnetic field is different from a steady magnetic field. The subharmonic components increase firstly and then decrease with the frequency of the magnetic field and the enhanced effect is related to the acoustic driving frequency. It is indicated that there may be a coupling interaction effect between the acoustic and magnetic fields. 展开更多
关键词 magnetic microbubbles ULTRASOUND magnetic field nonlinear oscillation
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DEFECT AND IMPROVEMENT OF TWO-TIME EXPANSION METHOD IN NONLINEAR OSCILLATIONS
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作者 程水利 谭志民 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1989年第10期915-924,共10页
In this paper, the defect of the Two-Time Expansion method is indicated and an improvement of this method is suggested. Certain examples.in which the present method is used, are given. Moreover, the paper shows the eq... In this paper, the defect of the Two-Time Expansion method is indicated and an improvement of this method is suggested. Certain examples.in which the present method is used, are given. Moreover, the paper shows the equivalence of the improved Two-Time Expansion Method and the method of KBM(Kryloy-Bogoliuboy-Mitropolski). 展开更多
关键词 In DEFECT AND IMPROVEMENT OF TWO-TIME EXPANSION METHOD IN nonlinear oscillationS
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Impact of Eccentricity on Nonlinear Oscillations of a Point-Like Charge in the Electric Field of a Curvature-Dependent Elliptic Charged Ellipse
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作者 Haiduke Sarafian 《American Journal of Computational Mathematics》 2020年第4期603-611,共9页
Calculation of the interactive force between two horizontally stacked circular uniformly charged rings placed along the common vertical axis conducive to nonlinear oscillations under gravity has been addressed [1]. Al... Calculation of the interactive force between two horizontally stacked circular uniformly charged rings placed along the common vertical axis conducive to nonlinear oscillations under gravity has been addressed [1]. Although challenging, nonetheless the scope of the study limited to uniform charge distributions of the rings. Here we extend the analysis considering a charged ellipse with a nonuniform, curvature-dependent elliptic charge distribution exerting a force on a point-like charge placed on the vertical symmetry axis. Nonuniform charge distribution and its impact on various practical scenarios are not a common theme addressed in literature. Applying Computer Algebra System (CAS) particularly <em>Mathematica</em> [2], we analyze the issue on hand augmenting the traditional scope of interest. We overcome the CPU expensive symbolic computation following our newly developed numeric/symbolic method [1]. For comprehensive understanding, we simulate the nonlinear oscillations. 展开更多
关键词 nonlinear oscillations Elliptic Curvature-Dependent Charge Distribution Computer Algebra System Mathematica
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Nonlinear Oscillations of a Pair of Charged Rings
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作者 Haiduke Sarafian 《American Journal of Computational Mathematics》 2020年第4期571-577,共7页
Two electrically charged rings of different sizes are assembled along their common vertical symmetry axis through their centers. The bottom ring is secured on a horizontal support while the top one is loose. For a set... Two electrically charged rings of different sizes are assembled along their common vertical symmetry axis through their centers. The bottom ring is secured on a horizontal support while the top one is loose. For a set of practical values characterizing the charged rings we envision a scenario where the mutual electric repulsion between the rings and the weight of the top ring results in stable nonlinear oscillations. To quantify the characteristics of the oscillations, we utilize a Computer Algebra System specifically <em>Mathematica</em> [1]. We accompany the analysis with a simulation for a comprehensive visual understanding. 展开更多
关键词 nonlinear oscillations Charged Ring-Ring Electrostatic Interaction Computer Algebra System Mathematica
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Nonlinear Oscillations Analysis of the Elevator Cable in a Drum Drive Elevator System
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作者 H.Askari D.Younesian Z.Saadatnia 《Advances in Applied Mathematics and Mechanics》 SCIE 2015年第1期43-57,共15页
This paper aims to investigate nonlinear oscillations of an elevator cable in a drum drive.The governing equation of motion of the objective system is developed by virtue of Lagrangian’s method.A complicated term is ... This paper aims to investigate nonlinear oscillations of an elevator cable in a drum drive.The governing equation of motion of the objective system is developed by virtue of Lagrangian’s method.A complicated term is broached in the governing equation of the motion of the system owing to existence of multiplication of a quadratic function of velocity with a sinusoidal function of displacement in the kinetic energy of the system.The obtained equation is an example of a well-known category of nonlinear oscillators,namely,non-natural systems.Due to the complex terms in the governing equation,perturbation methods cannot directly extract any closed form expressions for the natural frequency.Unavoidably,different non-perturbative approaches are employed to solve the problem and to elicit a closed-form expression for the natural frequency.Energy balance method,modified energy balance method and variational approach are utilized for frequency analyzing of the system.Frequencyamplitude relationships are analytically obtained for nonlinear vibration of the elevator’s drum.In order to examine accuracy of the obtained results,exact solutions are numerically obtained and then compared with those obtained from approximate closed-form solutions for several cases.In a parametric study for different nonlinear parameters,variation of the natural frequencies against the initial amplitude is investigated.Accuracy of the three different approaches is then discussed for both small and large amplitudes of the oscillations. 展开更多
关键词 nonlinear oscillation perturbation methods non-perturbative approach frequencyamplitude relationship
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OSCILLATION THEOREMS FOR SECOND ORDER NONLINEAR DIFFERENTIAL EQUATIONS WITH DAMPING
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作者 陈伯山 《Acta Mathematica Scientia》 SCIE CSCD 1991年第4期409-416,共8页
Some new oscillation theorems are established for the second order nonlinear differential equations with damping of the form where p(t) and q(t) are allowed to change sign on [t0,∞).
关键词 oscillation THEOREMS FOR SECOND ORDER nonlinear DIFFERENTIAL EQUATIONS WITH DAMPING
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Straightforward Method for Nonlinear Oscillators
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作者 吕国娟 何吉欢 +1 位作者 何春辉 SEDIGHI Hamid M 《Journal of Donghua University(English Edition)》 CAS 2023年第1期105-109,共5页
It is challenging to predict the frequency property of a nonlinear vibration system conveniently and efficiently.Especially,an invalid or physically irrelevant result might be obtained by some advanced methods.Therefo... It is challenging to predict the frequency property of a nonlinear vibration system conveniently and efficiently.Especially,an invalid or physically irrelevant result might be obtained by some advanced methods.Therefore,predicting the frequency lacks an expedient and efficient method.This challenge is addressed by developing a straightforward and effective frequency formulation that reliably predicts the frequency-amplitude relationship.This study provides a one-step approach which can fast determine the periodic properties of any conservative oscillators and also provides a reference for other similar studies. 展开更多
关键词 He's frequency formulation Duffing oscillator nonlinear oscillator
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C- METHOD AND ITS APPLICATION TO ENGINEERING NONLINEAR DYNAMICAL PROBLEMS 被引量:1
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作者 CHEN Yu-shu(陈予恕) +1 位作者 DING Qian(丁千) 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2001年第2期144-153,共10页
The C-L method was generalized from Liapunov-Schmidt reduction method, combined with theory of singularities, for study of non-autonomous dynamical systems to obtain the typical bifurcating response curves in the syst... The C-L method was generalized from Liapunov-Schmidt reduction method, combined with theory of singularities, for study of non-autonomous dynamical systems to obtain the typical bifurcating response curves in the system parameter spaces. This method has been used, ar an example, to analyze the engineering nonlinear dynamical problems by obtaining the bifurcation programs and response curves which are useful in developing techniques of control to subharmonic instability of large rotating machinery. 展开更多
关键词 C-L method nonlinear dynamics nonlinear oscillations bifurcation and chaos
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Incremental harmonic balance method for periodic forced oscillation of a dielectric elastomer balloon 被引量:1
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作者 Yin WANG Ling ZHANG Jinxiong ZHOU 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2020年第3期459-470,共12页
Dielectric elastomer(DE) is suitable in soft transducers for broad applications,among which many are subjected to dynamic loadings, either mechanical or electrical or both. The tuning behaviors of these DE devices cal... Dielectric elastomer(DE) is suitable in soft transducers for broad applications,among which many are subjected to dynamic loadings, either mechanical or electrical or both. The tuning behaviors of these DE devices call for an efficient and reliable method to analyze the dynamic response of DE. This remains to be a challenge since the resultant vibration equation of DE, for example, the vibration of a DE balloon considered here is highly nonlinear with higher-order power terms and time-dependent coefficients. Previous efforts toward this goal use largely the numerical integration method with the simple harmonic balance method as a supplement. The numerical integration and the simple harmonic balance method are inefficient for large parametric analysis or with difficulty in improving the solution accuracy. To overcome the weakness of these two methods,we describe formulations of the incremental harmonic balance(IHB) method for periodic forced solutions of such a unique system. Combined with an arc-length continuation technique, the proposed strategy can capture the whole solution branches, both stable and unstable, automatically with any desired accuracy. 展开更多
关键词 dielectric elastomer nonlinear oscillation incremental harmonic method arc-length continuation
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Oscillation of Davydov Solitons in Three Wells 被引量:1
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作者 Bi Qiao 《Journal of Modern Physics》 2016年第13期1811-1817,共7页
In this work, we propose a model of oscillation of Davydov solitons in three wells. It can be used as a mathematical and physical frame in simulation of circle of some nonlinear oscillation of excitations via acupunct... In this work, we propose a model of oscillation of Davydov solitons in three wells. It can be used as a mathematical and physical frame in simulation of circle of some nonlinear oscillation of excitations via acupuncture system. The calculation shows that this sort of oscillation is possible if the initial rate of average occupational number of the quasi-particles in the wells is not equal to zero. One of oscillations arising relies on the initial rate of average occupational number of quasi-particles to be equal with each other within three wells. Then, the oscillation is not a kind of Josephson oscillation and has complicated frequency distributions. However, the total behavior of oscillation played is similar to three big solitons concentrated in three wells. In this sense, this model generally reveals a sort of oscillation mechanism of the acupuncture system how to work in the body, which allows us to understand the oscillation that may be one of fundamental natures in the acupuncture system. 展开更多
关键词 nonlinear oscillation Davydov Soliton Acupuncture System
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RESEARCH OF THE PERIODIC MOTION AND STABILITY OF TWO-DEGREE-OF-FREEDOM NONLINEAR OSCILLATING SYSTEMS
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作者 LIU Jun(刘俊) 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2002年第10期1229-1236,共8页
The periodic motion and stability for a class of two-degree-of-freedom nonlinear oscillating systems are studied by using the method of Liapunov function. The sufficient conditions which guarantee the existence, uniqu... The periodic motion and stability for a class of two-degree-of-freedom nonlinear oscillating systems are studied by using the method of Liapunov function. The sufficient conditions which guarantee the existence, uniqueness and asymptotic stability of the periodic solutions are obtained. 展开更多
关键词 nonlinear oscillation periodic motion Liapunov function periodic solution
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ON INTERNAL RESONANCE OF NONLINEAR VIBRATING SYSTEMS WITH MANY DEGREES OF FREEDOM
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作者 刘世龄 徐兆 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1992年第1期29-37,共9页
The problem of periodic solutions of nonlinear autonomous systems with many degrees of freedom is considered. This is made possible by the development of a modified version of the KBM method[1]. The method can be used... The problem of periodic solutions of nonlinear autonomous systems with many degrees of freedom is considered. This is made possible by the development of a modified version of the KBM method[1]. The method can be used to generate limit cycle phase portrait, amplitude, period and to indicate stability of the limit cycle. 展开更多
关键词 nonlinear oscillations phase-locked solution phase portrait
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Homotopy Analysis Method for a Conservative Nonlinear Oscillator with Fractional Power
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作者 Huaxiong Chen Yanyan Wang 《Journal of Applied Mathematics and Physics》 2021年第1期31-40,共10页
In this paper, the homotopy analysis method is applied to deduce the periodic solutions of a conservative nonlinear oscillator for which the elastic force term is proportional to<em> u</em><sup>1/3&l... In this paper, the homotopy analysis method is applied to deduce the periodic solutions of a conservative nonlinear oscillator for which the elastic force term is proportional to<em> u</em><sup>1/3</sup>. By introducing the auxiliary linear operator and the initial guess of solution, the homotopy analysis solving is set up. By choosing the suitable convergence-control parameter, the accurate high-order approximations of solution and frequency for the whole range of initial amplitudes can easily be obtained. Comparison of the results obtained using this method with those obtained by different methods reveals that the former is more accurate, effective and convenient for these types of nonlinear oscillators. 展开更多
关键词 Homotopy Analysis Method Approximate Solutions Fractional Power nonlinear oscillation
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Coulomb, Yukawa, and Hooke’s Oscillations
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作者 Haiduke Sarafian 《American Journal of Computational Mathematics》 2022年第1期1-6,共6页
Oscillations due to three different forces in three areas of physics: electrostatic, nuclear, and mechanics, are analyzed. The electrostatic long-range Coulomb force has a different character than the nucleonic short-... Oscillations due to three different forces in three areas of physics: electrostatic, nuclear, and mechanics, are analyzed. The electrostatic long-range Coulomb force has a different character than the nucleonic short-range Yukawa force. Both are different from the linear Hooke’s force. The equation of motion of each case is solved applying a Computer Algebra System (CAS). It is shown that these oscillations have similarities and differences. Phase diagrams of all three cases are compared. 展开更多
关键词 nonlinear oscillations Yukawa Force Coulomb Force Computer Algebra System (CAS) MATHEMATICA
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A hyperbolic Lindstedt-Poincare method for homoclinic motion of a kind of strongly nonlinear autonomous oscillators 被引量:7
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作者 Y.Y.Chen S.H.Chen K.Y.Sze 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2009年第5期721-729,共9页
A hyperbolic Lindstedt-Poincare method is presented to determine the homoclinic solutions of a kind of nonlinear oscillators, in which critical value of the homoclinic bifurcation parameter can be determined. The gene... A hyperbolic Lindstedt-Poincare method is presented to determine the homoclinic solutions of a kind of nonlinear oscillators, in which critical value of the homoclinic bifurcation parameter can be determined. The generalized Lienard oscillator is studied in detail, and the present method's predictions are compared with those of Runge-Kutta method to illustrate its accuracy. 展开更多
关键词 Lindstedt-Poincare method Hyperbolic function nonlinear autonomous oscillator - Homoclinic orbit
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Solving the Optimal Control Problems of Nonlinear Duffing Oscillators By Using an Iterative Shape Functions Method 被引量:2
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作者 Cheinshan Liu Chunglun Kuo Jiangren Chang 《Computer Modeling in Engineering & Sciences》 SCIE EI 2020年第1期33-48,共16页
In the optimal control problem of nonlinear dynamical system,the Hamiltonian formulation is useful and powerful to solve an optimal control force.However,the resulting Euler-Lagrange equations are not easy to solve,wh... In the optimal control problem of nonlinear dynamical system,the Hamiltonian formulation is useful and powerful to solve an optimal control force.However,the resulting Euler-Lagrange equations are not easy to solve,when the performance index is complicated,because one may encounter a two-point boundary value problem of nonlinear differential algebraic equations.To be a numerical method,it is hard to exactly preserve all the specified conditions,which might deteriorate the accuracy of numerical solution.With this in mind,we develop a novel algorithm to find the solution of the optimal control problem of nonlinear Duffing oscillator,which can exactly satisfy all the required conditions for the minimality of the performance index.A new idea of shape functions method(SFM)is introduced,from which we can transform the optimal control problems to the initial value problems for the new variables,whose initial values are given arbitrarily,and meanwhile the terminal values are determined iteratively.Numerical examples confirm the high-performance of the iterative algorithms based on the SFM,which are convergence fast,and also provide very accurate solutions.The new algorithm is robust,even large noise is imposed on the input data. 展开更多
关键词 nonlinear Duffing oscillator optimal control problem Hamiltonian formulation shape functions method iterative algorithm
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Coupled large earthquakes in the Baikal rift system: Response to bifurcations in nonlinear resonance hysteresis 被引量:1
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作者 Anatoly V.Klyuchevskii Rem G.Khlebopros 《Geoscience Frontiers》 SCIE CAS CSCD 2013年第6期709-716,共8页
The current lithospheric geodynamics and tectonophysics in the Baikal rift are discussed in terms of a nonlinear oscillator with dissipation.The nonlinear oscillator model is applicable to the area because stress chan... The current lithospheric geodynamics and tectonophysics in the Baikal rift are discussed in terms of a nonlinear oscillator with dissipation.The nonlinear oscillator model is applicable to the area because stress change shows up as quasi-periodic inharmonic oscillations at rifting attractor structures (RAS).The model is consistent with the space-time patterns of regional seismicity in which coupled large earthquakes,proximal in time but distant in space,may be a response to bifurcations in nonlinear resonance hysteresis in a system of three oscillators corresponding to the rifting attractors.The space-time distribution of coupled MLH > 5.5 events has been stable for the period of instrumental seismicity,with the largest events occurring in pairs,one shortly after another,on two ends of the rift system and with couples of smaller events in the central part of the rift.The event couples appear as peaks of earthquake ‘migration' rate with an approximately decadal periodicity.Thus the energy accumulated at RAS is released in coupled large events by the mechanism of nonlinear oscillators with dissipation.The new knowledge,with special focus on space-time rifting attractors and bifurcations in a system of nonlinear resonance hysteresis,may be of theoretical and practical value for earthquake prediction issues.Extrapolation of the results into the nearest future indicates the probability of such a bifurcation in the region,i.e.,there is growing risk of a pending M ≈ 7 coupled event to happen within a few years. 展开更多
关键词 nonlinear geodynamics nonlinear oscillator with dissipation Phase portrait Bifurcation HYSTERESIS Coupled large earthquakes Baikal rift system
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