Abstract
The fractional stochastic vibration system is quite different from the traditional one, and its application potential is enormous if the noise can be deployed correctly and the connection between the fractional order and the noise property is unlocked. This article uses a fractional modification of the well-known van der Pol oscillator with multiplicative and additive recycling noises as an example to study its stationary response and its stochastic bifurcation. First, based on the principle of the minimum mean square error, the fractional derivative is equivalent to a linear combination of damping and restoring forces, and the original system is simplified into an equivalent integer order system. Second, the Itô differential equations and One-dimensional Markov process are obtained according to the stochastic averaging method, using Oseledec multiplicative ergodic theorem and maximal Lyapunov exponent to judge local stability, and judging global stability is done by using the singularity theory. Lastly, the stochastic D-bifurcation behavior of the model is analyzed by using the Lyapunov exponent of the dynamical system invariant measure, and the stationary probability density function of the system is solved according to the FPK equation. The results show that the fractional order and noise property can greatly affect the system’s dynamical properties. This paper offers a profound, original, and challenging window for investigating fractional stochastic vibration systems.
1 Introduction
Fractional derivative [1, 2] is an extension of the theory of integer derivatives, and the study of fractional derivatives has a history of over 300 years. Some new materials have appeared, e.g., viscoelastic materials, nanomaterials, cement mortar, 3D-printed materials, and porous materials [3–8], which are different from either a solid or a fluid, and their constitutive relation is extremely difficult to be expressed correctly by the traditional calculus though much effort has been made to solve the problem, for example, using the fractal viscoelastic model [9] and the fractal rheological model [10]; the intractable constitutive relation has not yet been solved.
Considering its memory property, we consider that fractional calculus might be the best candidate for stochastic dynamical systems [11, 12]. Stochastic disturbances are widespread in nature, and fractional stochastic systems have become a hot spot in both mathematics and physics to deal with noise excitation. For example, energy-harvesting devices [13–15] are always subject to random excitation, and a fractional model can effectively reveal the bifurcation properties and multiple attractors of the energy-harvesting system, for example, Ref. [16]. Fractional models for Gaussian white noise also caught much attention [17–21], and the fractional convolution kernel neural network is a suitable mathematical tool for fault diagnosis [22–24]. Duffing oscillator [25, 26] is extended to its fractional partner under noise [27, 28]. Van der Pol oscillator [29] is another widely used model for the analysis of fractional stochastic P-bifurcation [30, 31].
In reality, noise exists in all aspects of practical applications, especially in nonlinear systems. The properties of stationary response, energy-harvesting efficiency, stability, and bifurcation will be greatly affected by noise excitation. At present, the research on the dynamic behavior of systems driven by recycling noise has attracted widespread attention from domestic and foreign scholars and achieved fruitful results, especially in the birhythmic biological system [32], stochastic resonance in asymmetric bistable systems [33], and the double entropic stochastic resonance phenomenon [34]. In this article, the fractional van der Pol model with recycling noise is adopted to investigate its dynamical properties.
2 Model description
Balthazar van der Pol is a famous electronic engineer in the Netherlands. In 1927, he first deduced the famous van der Pol equation in order to describe the oscillation effect of triodes in electronic circuits, as shown below:
Afterward, as a classic nonlinear dynamic system, it is often used in mathematics and some nonlinear dynamic systems to demonstrate its dynamic behavior characteristics. In continuous research, the highest number of nonlinear terms considered is also constantly increasing, and there are also various methods for solving approximate solutions of such equations [35, 36]. From the classical van der Pol equation, changing the order of the equation can obtain systems with different dynamic behaviors, thereby better obtaining the dynamic behavior characteristics of the system. Therefore, we use the following equation to introduce the fractional generalized van der Pol model with multiplicative and additive recycling noise:where is the damping coefficient, are nonlinear damping coefficients, is the frequency, and are independent recycling noises, i.e., , . The power spectral density of recycling noise is obtained as:
is the Caputo fractional derivative [1, 2] of order about defined as:
There are other definitions of fractional derivatives, for example, two-scale fractal derivative [37–41] and He’s fractional derivative [42]. The Caputo fractional derivative has memory property [43, 44], so it is used for the present study.
The term in Eq. 1 can be expressed in a combination of spring stiffness and damping terms [45–48], hence, Eq. 1 becomes:where and are the equivalent damping and stiffness coefficients of fractional damping, respectively.
In order to identify and , we introduce an error function, which reads
According to the minimum mean square method [44], we have
Equation 6 leads to the following equations:
Assuming thatand , we have
Considering Eq. 8, 9, we re-write Eq. 7 in the form
For the same reason, we have
Hence
To simplify Eq. 10 further, we use the following asymptotic integrals
In view of Eq. 11, the integral averaging of Eq. 10 with respect to results in
Hence, the equivalent system (4) can be written in the formwhere
3 Model processing
Now the problem becomes relatively simple; we assume that the solution of Eq. 13 can be expressed as [49].where and are the amplitude and initial phase of the system, respectively.
We re-write Eq. 13 in the form
By Eq. 15 and the stochastic averaging method [50], Eq. 16 becomeswhere
The recycling noise is a stationary process and can be approximated by a 2-D diffusion process. After stochastic averaging, the drift and diffusion coefficients are as follows:where is the value of power spectral density of at .
For the deterministic averaging of , we have
The corresponding Itô SDE iswhere
The one-dimensional Markov Process can be expressed as:where
4 Stochastic stability analysis
4.1 The local stochastic stability
Considering the case of and linear Itô stochastic stability, from Eq. 24, we obtain
Therefore, it is obtained that and , using Oseledec multiplicative ergodic theorem [51] and maximal Lyapunov exponents to judge local stability. According to Itô stochastic differential equation, the solution of Eq. 26 is
Then the approximate solution of the Lyapunov exponent of Itô stochastic differential equation is obtained
When , i.e., , Eq. 26 is stable in the sense of probability, and Eq. 16 is stable at the balance point. When , i.e., , the effect is just the opposite.
4.2 The global stochastic stability
4.2.1 Linear Itô stochastic stability
Judging global stability by the singularity theory, is the first kind of singular boundary of Eq. 26. is the second kind of singular boundary problem of Eq. 26. Calculating the diffusion index, drift indices, and characteristic value at boundary and , respectively, yields
And the following conclusions are drawn, as shown in Table 1.
TABLE 1
| Condition | State | Category | Conclusion | |
|---|---|---|---|---|
| Attract natural boundary | The trivial solution of Eq. 26 is stable in the sense of probability, and the original system is probabilistically stable at the balance point | |||
| Exclude natural boundary | ||||
| Exclude natural boundary | The trivial solution of Eq. 26 is unstable in the sense of probability, and the original system is probabilistically unstable at the balance point | |||
| Attract natural boundary | ||||
| Strict natural boundary | The critical condition of system bifurcation | |||
Global stability analysis.
4.2.2 Stability of nonlinear Itô stochastic differential equation
When , is the first kind of singular boundary of Eq. 24. When and , is the second kind of singular boundary problem of Eq. 24. Calculating the diffusion index, drift indices, and characteristic value at boundary and , respectively, yields
Conclusion: when and are a strict natural boundary; when , , and , the boundary is an exclude natural boundary; when and , the boundary is an attract natural boundary; when and , the boundary is a strict natural boundary. Therefore, is a critical condition of system bifurcation.
5 Stochastic bifurcation analysis
5.1 D-bifurcation
If , Eq. 13 becomes a deterministic system without a stochastic bifurcation phenomenon. Therefore, discussing the situation of and , let and , then the continuous dynamic system generated by Eq. 26 is
Equation 27 is the only strong solution of Eq. 26 with as the initial value. When and , let be bounded, for all , the elliptic condition is satisfied, so there is only one stationary probability density. Therefore, the FPK equation corresponding to Eq. 26 is obtained.
Let get the stationary probability density corresponding to Eq. 28
At this time, Eq. 27 has a non-trivial stationary state and a fixed-point equilibrium state. Assuming the invariant measures of these two kinds of stationary states are and , respectively, the density is Eq. 29 and , respectively. Hence, the solution of Eq. 28 is
The Lyapunov exponent of with respect to estimate can be defined as follows
Substituting Eq. 30 into Eq. 31, here and , its Lyapunov exponent of the fixed-point reads
Invariant estimate with Eq. 29 as density. Substituting Eq. 30 into Eq. 31. Assuming that and are bounded and integrable, respectively, the Lyapunov exponent can be obtained
Let , when and , is stable, is unstable; when and , is unstable, is stable. So is a D-bifurcation point of Eq. 13.
5.2 P-bifurcation
5.2.1 Stochastic P-bifurcation under additive recycling noise
When additive noise just exists, and . The following is an analysis of the stochastic P-bifurcation of the system in this case. Eq. 22, 23 show that the Itô stochastic differential equation corresponding to does not depend upon , and it is a 1-D diffusion process; its corresponding FPK equation can be expressed asthe corresponding boundary conditions are
In view of Eq. 35, the stationary probability density of the amplitude iswhere is the normalization constant,
In view of Eq. 23, from Eq. 36, we obtainwhere
The original system response meets , in view of Eq. 38, the joint probability density function of the system is
5.2.1.1 Influence of fractional order
As fractional damping is a combination of the equivalent stiff and equivalent damping, the fractional order is of paramount importance; its value can be calculated by He-Liu’s fractal formulation [52] for practical applications. According to Eq. 12, when , fractional damping becomes a damping term, while when , it is a stiff term.
Setting , and in Eq. 13 as that in Refs [30, 53], the stochastic P-bifurcation is studied hereby. Keeping constant, we draw the joint probability density function section and top view of Eq. 13 under the influence of different fractional orders.
When , the joint probability density function diagram shows a crater shape; there is only one peak in the section, and there is only a large limit cycle. The response is shown as a vibration far beyond the origin (Figure 1).
FIGURE 1
When , from the section, it can be clearly seen that there are two peaks, but the second peak has a much larger amplitude. At this time, the system has a balance point and a large limit cycle; hence, the system response switches between two peaks, and the probability of a large amplitude vibration is high, as shown in Figure 2.
FIGURE 2
When , the section has three peaks, showing two peaks in addition to the origin. A balance point now coexists with a large and small limit cycle in the system, and the system response switches between the three peaks, which is a multimodal response. Due to the existence of the double limit point set, the relative heights of the joint probability density function peaks at the three peaks are different, implying that the system response peaks are different, as shown in Figure 3.
FIGURE 3
When , the section has two peaks, in contrast to Figure 2, the relative height of the peak changes, with the second peak being significantly smaller. At this time, the system has both a balance point and a small limit cycle; hence, the system response switches between two peaks, and the probability of a small amplitude vibration is high, as shown in Figure 4.
FIGURE 4
Based on the above discussions, we conclude that the fractional order can cause stochastic P-bifurcation behavior in the system. From Figure 5, we find that an increasing fractional order will change the stationary response from a single mode to a dual mode and then to a tristable mode. The peak value changes from a single peak to two peaks and then to three peaks, so stochastic P-bifurcation occurs. Increasing the value of to 0.145 again, the tristable disappears and the bistable appears; the peak value changes from three peaks to two peaks, so stochastic P-bifurcation occurs.
FIGURE 5
5.2.1.2 Influence of noise intensity
Keeping the above parameters unchanged, and fixing , we draw the joint probability density function section and top view of Eq. 13 under the influence of different noise intensity.
When , the joint probability density function diagram shows a crater shape, there is only one peak in the section, and there is only a large limit cycle. The response is shown as a vibration far beyond its origin, as shown in Figure 6.
FIGURE 6
When , from the section, it can be clearly seen that there are two peaks, but the first peak is much smaller. At this time, the system has both a balance point and a large limit cycle; hence, the system response switches between two peaks, and the probability of a large amplitude vibration is high, as shown in Figure 7.
FIGURE 7
When , the section has three peaks, showing two peaks in addition to the origin. A balance point now coexists with a large and small limit cycle in the system, and the system response switches among the three peaks, which is a multimodal response. Due to the existence of the double limit point set, the relative heights of the joint probability density function peaks at the three peaks are different, implying that the vibration frequency of the system response peak is different, as shown in Figure 8.
FIGURE 8
When , the section has two peaks, in contrast to Figure 7; the relative height of the peak changes, with the first peak being much larger. At this point, the system has a balance point and a small limit cycle, the system response switches between two peaks, and the probability of a small amplitude vibration is high, as shown in Figure 9.
FIGURE 9
Based on the above discussions, it can be verified that changing the noise intensity affects greatly stochastic P-bifurcation property. From Figure 10, it can also be seen that with noise intensity being reduced, the stationary response of the system switches from a single mode to a dual mode and then to a tristable mode. The peak value of the stationary probability density function curve changes from a single peak to two peaks and then three peaks, so stochastic P-bifurcation occurs. Decreasing the value of to 0.0013 again, the tristable disappears and the bistable appears; the peak value changes from three peaks to two peaks, so stochastic P-bifurcation occurs.
FIGURE 10
5.2.2 Additive and multiplicative recycling noise
When and , the expression of the stationary probability density function of the amplitude of Eq. 13 iswhere is the normalization constant,
In view of Eq. 23, from Eq. 42, we havewhere
Keeping the above parameters unchanged, we draw the joint probability density function section and top view of Eq. 13 under the influence of different fractional orders and noise intensity.
When , let and . The joint probability density function diagram shows a crater shape; there is only one peak in the section, and there is only a large limit cycle. The response is shown as a vibration far away from the origin. At the same time, reducing the value of noise intensity reveals that the peak of the joint probability density does not change with only one peak. However, the system only has a limit cycle, which has been in a monostable. Therefore, there is no stochastic P-bifurcation phenomenon occurring, as shown in Figure 11.
FIGURE 11
When , let and . From the section, it can be clearly seen that there are two peaks, but the second peak has a much larger amplitude. At this time, the system has both a balance point and a limit cycle; hence, the system response switches between two peaks, and the large amplitude vibration has a higher probability. When the simultaneous improvement of the noise intensifies to and , the peak value of the stationary probability density function curve changes from two peaks to one peak. There is only a large limit cycle, and the system response becomes a vibration far from the origin. Therefore, increasing the noise intensity induces a stochastic P-bifurcation property, as shown in Figure 12.
FIGURE 12
When , let and . The section has a peak near the origin. There is only a balance point in the system at this time, and the response is shown as a vibration closer to the origin. When simultaneously improving its noise intensity to and , the peak value of the stationary probability density function curve changes from a single peak to two peaks. At this time, the system has both a balance point and a limit cycle; hence, the system response switches between two peaks, and the probability of a large amplitude vibration is small. Therefore, increasing the noise intensity induces the stochastic P-bifurcation phenomenon. Further increasing the noise intensity to and , the peak value of the section changes relatively, and the first peak is lower. The system response switches between two peaks, and the probability of a small one is small. Continuing to increase the value of noise intensity to and , the peak value of the curve changes from two peaks to a single peak. There is only a limit cycle in the system at this time, and the response is shown as a vibration far away from the origin. Therefore, increasing the noise intensity induces the second stochastic P-bifurcation phenomenon, as show in Figure 13.
FIGURE 13
6 Conclusion
In this paper, the stationary response and the stochastic bifurcation of the fractional van der Pol equation under multiplicative and additive recycling noise excitations are investigated. By the least square method, we obtain an equivalent integral nonlinear stochastic system. The Itô differential equation and One-dimensional Markov process are obtained according to the stochastic averaging method. We discuss the local and global stochastic stability and analyze the conditions for inducing D-bifurcation and P-bifurcation in the system. The analysis shows that when and , the point equilibrium state becomes stable, and the non-trivial stationary state becomes unstable; when and , the result is the opposite. So is a D-bifurcation point of the original system. When only additive noise exists, the fractional order and the noise intensity will greatly affect the system’s property. It was found that reducing the order or increasing the noise intensity can cause nonlinear jumping or significant oscillation in the system, leading to system instability. Through increasing the order or reducing the noise intensity , the system response is in a monostable state or a small disturbance near the balance point. Similarly, when additive and multiplicative noise coexist, selecting appropriate parameters can maintain the system response at a monostable or small disturbance near the balance point. Therefore, in practical engineering, to avoid the potential adverse effects of high noise intensity on the system, the occurrence of stochastic bifurcation behavior can be controlled by changing the noise intensity or fractional order. In the future, we will combine theory with practice to explore the impact of recycling noise on the stationary response and stochastic bifurcation of systems in wind turbines. We will study the impact of changing noise intensity and fractional order on the system, and how to handle these adverse effects to achieve optimal system performance.
Statements
Data availability statement
The original contributions presented in the study are included in the article/Supplementary material, further inquiries can be directed to the corresponding author.
Author contributions
J-GZ: supervision, writing–review and editing, funding acquisition, investigation, and project administration. FW: writing–original draft, writing–review and editing, and software. H-NW: writing–review and editing and software. All authors contributed to the article and approved the submitted version.
Funding
This study was supported by the key project of the Gansu Province natural science foundation of China (No. 23JRRA882).
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s note
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Summary
Keywords
van der Pol system, fractional derivative, recycling noise, stochastic averaging method, stochastic bifurcation
Citation
Zhang J-G, Wang F and Wang H-N (2023) Fractional stochastic vibration system under recycling noise. Front. Phys. 11:1238901. doi: 10.3389/fphy.2023.1238901
Received
12 June 2023
Accepted
18 July 2023
Published
02 August 2023
Volume
11 - 2023
Edited by
Ji-Huan He, Soochow University, China
Reviewed by
Muhammad Nadeem, Qujing Normal University, China
Yajie Li, Henan University of Urban Construction, China
Ain Qura Tul, Guizhou University, China
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© 2023 Zhang, Wang and Wang.
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*Correspondence: Jian-Gang Zhang, Zhangjg7715776@126.com
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