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Parovik R.I. Int. Journal of Engineering Research and Application
ISSN : 2248-9622, Vol. 3, Issue 5, Sep-Oct 2013, pp.1520-1523

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RESEARCH ARTICLE

OPEN ACCESS

Phase Trajectories of the Fractal Parametric Oscillator
Parovik R.I.
Institute of Cosmophysical Researches and Radio Wave Propagation Far Eastern Branch of the Russian
Academy of Sciences, Russia,
Branch of Far Eastern Federal University, Petropavlovsk-Kamchatskiy, Russia,
Kamchatka State University by Vitus Bering, Petropavlovsk-Kamchatskiy, Russia,

ABSTRACT
In this paper we consider a model of fractal parametric oscillator. Conducted a phase analysis of the decision
model, and built its phase trajectories.
Keywords: parametric oscillator, the phase trajectories, the Mittag-Leffler function, the operator Gerasimov –
Caputo
(1) is the fractional derivative of order 1    2 ,
I.
INTRODUCTION
which is defined as
t
In investigation nonlinear dynamical
u   d
1

 0t u   
systems often use the concept of a fractal, which is
  t    1 .
 2    0
associated with the study of fractal geometry and
processes such as, deterministic chaos, which is
(3)
consistent with the theory of physics of open systems
[1].
The parameters  ,  , u1 , u 2 , defined constants.
The development of nonlinear dynamical
If in (1) put   0 and     then it is the well
systems has led to develop new methods of analysis.
One of these is the method of fractional derivatives
known equation of fractional oscillator, which is
[2]. This method to determine the natural
studied in [4]-[6]. In [4] investigated of the fractal
phenomenon, in nonlinear dynamic systems, and
oscillator was by using the fractional derivatives of
other: economic, social, humanitarian. If in this
Riemann-Liouville. In [5] and [6] - by using the
method change the order of the fractional derivative
Caputo operator (3), but the more correct to call it the
confirmed the known results, but also study new
Gerasimov-Caputo operator. Mention of this
results.
statement can be found in A. Gerasimov (1948) [7].
Study presents a model of fractal parametric
Equation (1) is a generalization of the
oscillation system and its phase trajectories.
Mathieu equation, which describes the parametric
Development the theory of fractal oscillatory systems
excitation of oscillation in mechanical systems, as
can be a method of Radio physics dynamic processes,
well as the related phenomenon of parametric
such as ionosferno-magnetospheric plasma.
resonance. The system described by equation (1) call
fractal parametric oscillator.
II.
STATEMENT OF THE PROBLEM AND
The solution of the problem (1-2) is a Volterra
integral equation of the second kind [3]
SOLUTION METHOD
t
In [3], the Cauchy problem for the fractional
u  t    K  t    u  d  g  t  .
Mathieu equation: to find a solution, u  t  ,
0

t 0, T  :

Here the kernel K  t,    (t   )  1 E ,    t      cos   

and the right side of (2)
g  t   u1E ,1   t    u2tE ,2   t   .


0t u       cos t  u  t   0 ,



(1)

u  0  u1 , u  0  u2 .
(2)

(1)k  t 
- the
    k  1
k 0

Here cos t   E ,1   t   





k

generalized cosine (function of Mittag-Leffler) with a
parameter 1    2 . Put   2 , get the usual cosine,
i.e.

cos2 t   cos t  .

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Note that if in (2) to put   0 , obtain a well-known
solution to the equation of fractional oscillator. [6]:
u  t   u1E ,1   t    u2tE ,2   t  
Solution of the integral equation (2) can be obtained
using the composite trapezoidal quadrature formula:

The left side of equation

1520 | P a g e
Parovik R.I. Int. Journal of Engineering Research and Application
ISSN : 2248-9622, Vol. 3, Issue 5, Sep-Oct 2013, pp.1520-1523

 
D0t E0t, f    E0t,
,

   , 

i 1

u1  g1 , ui 

i  2,3,..., n ; h 

gi  h  j K i , ju j
j 1

1

,

hK i ,i
2

where D 
0t

1 2, j  1
T
; j 
. (4)
n 1
1, j  1

In (4) needed that the denominator 1 

hK i ,i
2

 0 . This

can always be achieved by reducing the value of the
step h .

THE PHASE TRAJECTORIES OF
FRACTAL PARAMETRIC OSCILLATOR

Write the solution (2) as follows:

u  t   u1E ,1   t    u2tE ,2   t   

0

This equation can be written in following form:
 
u  t   u1E ,1   t    u2tE ,2   t     E0t, f  
,
(4)
Applying [8], there was used the following operator:
t



E0t, f     (t   ) 1 E ,   t     f  d ,
,


0

f    cos   u   .

  D0t

 2 



 1

differential form  0t

1

 
D0t D0t1  E0t(, 1), f   





   E ,1   t    cos   u   d .


(10)

0

Finally, obtain the equation for the derivative of the
order   1 :

w t   u1 tE ,2   t    u2 t 2 E ,3   t   
t





  E ,1   t    cos   u   d .


0

(11)
Equation (11) is an integral Volterra equation of
the second kind, and it can be solved numerically
using the method (3). Phase trajectories are based on
the respective pairs of points

IV.

(5)
Some properties of (5) are considered in [8].
Apply the Gerasimov-Caputo operator fractional

(9)
t
f   d
1
f   
  t   1 - the fractional
    0

In view of this property and the property (9), obtain:


1

0t1  E0t, f    D0t 2  D0t  E0t, f   
 ,

 ,


t


  (t   )  1 E ,   t     cos   u  d .



f   ,  0,   0 ,

integration operator. The Gerasimov-Caputo operator
can be expressed through the fractional integral:
 2 

1
0t1 f    D0t  D0t f   .

t

III.

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ui , wi  .

THE RESULTS OF THE CALCULATIONS

In the numerical simulation, for simplicity,
put u2  0 and u1    1 .

to the solution (4), obtain:



w  t    0t1u     0t1 u1E ,1   t   





 
 0t1 u2tE ,2   t      0t1  E0t, f    .
 ,



(6)
Consider each of the terms in equation (6).

   t  k 


 0t1 u1E ,1   t    u1 0t1 


k 0    k  1


k


    0t1 t  k 
   u  tE  t  .
 u1 

1
 ,2 
   k  1
k 0


k

(7)
In (7) have used the property [9]:
    t   1
.
 t  1  
0t 
   
Similarly, obtain for the second term in (6)
    t   1
.
 t  1  
0t 
   
(8)

 
Consider the last term in (6)  0t1  E0t, f   . In
 ,

[8] proved the semigroup property of the operator:
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Fig. 1. Phase trajectories of: a) a harmonic oscillator
and a fractal oscillator   0 : curve 1 -   1.8 , curve
2 -   1.6 , curve 3 -   1.4 ; b): fractal parametric
oscillator   2,   1 : curve 1 -   1.8 , curve 2   1.6 , curve 3   1.4 ; c)   1.8,   1 : curve 1 -

  1.8 , curve 2 -   1.6 , curve 3 -   1.4 .
In Fig. 1 presents phase trajectories with the
parameters n  100, t   0,2  for the following
cases: (Fig. 1a) harmonic oscillator - a circle, plot
with the values of the parameters   2,   0 , the
fractal oscillator - (Fig. 1b) fractal parametric
oscillator - and (Fig. 1c).
Fig. 1a (state trajectory is a circle)
corresponds to the classical harmonic oscillations of
the system. The phase trajectories of the fractal
oscillator are coordinated with phase trajectories
plotted in [4].
1521 | P a g e
Parovik R.I. Int. Journal of Engineering Research and Application
ISSN : 2248-9622, Vol. 3, Issue 5, Sep-Oct 2013, pp.1520-1523
New results are shown in Fig.1b and Fig.1c.
In the first case, for   1,8 and for different values
 , the phase trajectories of parametric oscillator are
similar to the phase trajectories of fractal oscillator
(Fig. 1a), but have a decaying type view of
sustainable focus. Seen (Fig. 1b) sometimes are
regrouping trajectories. This is due to the properties
of the generalized cosine function, which is included
in the original equation (1). Phase trajectory in Fig.
1c was plotted with   2 and different values  . In
this case phase trajectories have a different view.
In Fig. 2 shows the phase trajectory in Fig.
2a and the solution of the original Cauchy problem
(1) - (2) According to [4] for the parameter value, the
fractional parameter depends on time according to the
law. Parameters   0 and g  0 define the limits
of values   t  : 1      t   2  g and satisfy
inequality g    1 , m – any number.
For the calculations were selected
parameters:

following

n  300, t   0,4  ,   0,95, g  0, m  18 .

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If changing  from 1 to 2, get different fractional
equation (1), each has a family of solutions and
properties. This allows us to make the following
observation.
Notice. In study [4], the authors concluded that the
nonlinear signal any oscillating system can be
parameterized by a solution of a fractal oscillator.
Similarly, can assume that the complex signal
represented by a solution of the fractal parametric
oscillator. Build a model of a signal

f  t  , then by

(2) get:
t

f  t   g  t    K  t    f  d 
0

 u1E ,1   t    u2tE ,2   t   



t





  (t   )  1 E ,    t     E ,1    f   d


0

Function values

f  t  at discrete points in

time are known from the experiment. Then the
problem of identification of the model is: to define
    u1, u2 , , , t  . In contrast to study [4] the
value  also depends on the fractional parameter  ,
it led more flexibility to present the original signal.
This problem is quite complex and deserves attention
in the future study of the properties of fractal
parametric oscillator.

In Fig. 2a shows that the phase trajectory has
multiple return points, which corresponds to the
results of [4]. In Fig. 2b plotted the calculated curve the shift function. The curve has an oscillating form
of constant amplitude. This is due to the introduction
in equation (1) the differentiation operator of
fractional order  .
In Fig. 3 shows the phase trajectory and the offset

u  t  for the fractal parametric oscillator. For the

calculation put:
n  100, t   0,2  , g  0.01,   1,   0.95, k  18,   1.8 .

V.

VI.

In Fig. 3a shows the difference between the phase
trajectory of the fractal parametric oscillator and the
phase trajectory of the fractal oscillator (Fig. 3a). In
this case the phase trajectory is not closed. An offset

Acknowledgements

This study was performed under the
program No 12-I-DPS-16 "Fundamental problems of
the impact of powerful radio waves on the
atmosphere and the Earth plasmosphere" and with the
support of the Ministry of Education and Science of
the Russian Federation for the strategic development
"Kamchatka State University named after Vitus
Bering" for 2012 – 2016 years.

REFERENCES

u  t  (Fig. 3b) has a more complex structure: more

[1]

frequent oscillations with variable amplitude.

[2]

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CONCLUSION

Solution the Cauchy problem (1-2)
generalizes the well-known solutions for the
harmonic oscillator and fractal oscillator. Were
plotted phase trajectories. Calculations confirmed the
earlier results [4] and led to new results. The phase
trajectories of the parametric oscillator differ from
the previous ones and have a more complex structure.
So there may be non-linear effects in such systems.
Suggested that the nonlinear signal can be
represented by a fractal parametric oscillator
solutions that deserve further study

Klimontovich Yu.L. Vvedenie v fiziku
otkrytykh system (Мoscow: Yanus-K, 2002).
Nakhushev A.M. Drobnoe ischislenie i ego
primenenie (Мoscow: Fizmatlit, 2003).
1522 | P a g e
Parovik R.I. Int. Journal of Engineering Research and Application
ISSN : 2248-9622, Vol. 3, Issue 5, Sep-Oct 2013, pp.1520-1523
[3]

[4]

[5]

[6]

[7]

[8]

[9]

www.ijera.com

Parovik R.I. Fractal Parametric Oscillator as
a Model of a Nonlinear Oscillation System
in Natural Mediums, International Journal
Communications, Network and System
Sciences, 6, 2013, 134-138
Meilanov R.P., Yanpolov M.S. Osobennosti
fazovoy traektorii fraktalnogo ostsillyatora,
Pisma ZHTF, 1(28), 2002, 67-73.
Mainardi F. Fractional relaxation-oscillation
and fractional diffusion-wave phenomena,
Chaos, Solitons and Fractals, 9(7), 1996,
1461-1477.
Nakhusheva
V.A.
Differentsialnуe
uravneniya
matematicheskikh
modelei
nelokalnykh protsesov (Мoscow: Nauka,
2006).
Gerasimov A.N. Obobshchenie lineinykh
zakonov deformirovaniya i ego primenenie
k
zadacham
vnutrennego
treniya,
Prikladnaya matematika i mekhanika, 12,
1948, 251-260.
Ogorodnikov E.N. Korrektnost zadachi
Koshi-Gursa
dlya
sistemy
vyrozhdayushikhsya
nagruzhennykh
giperbolicheskikh uravnenii v nekotorykh
spetsialnykh sluchayakh i ee ravnosilnost
zadacham
s
nelokalnymi
kraevymi
usloviyami, Vestnik SamGTU. Fiz.-mat.
nuki, 26. 2004, 26–38.
Kilbas A.A., Srivastava H.M., Trujillo J.J.
Theory and Application of Fractional
Differential
Equations
(Amsterdam:
Elsevier, 2006).

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  • 1. Parovik R.I. Int. Journal of Engineering Research and Application ISSN : 2248-9622, Vol. 3, Issue 5, Sep-Oct 2013, pp.1520-1523 www.ijera.com RESEARCH ARTICLE OPEN ACCESS Phase Trajectories of the Fractal Parametric Oscillator Parovik R.I. Institute of Cosmophysical Researches and Radio Wave Propagation Far Eastern Branch of the Russian Academy of Sciences, Russia, Branch of Far Eastern Federal University, Petropavlovsk-Kamchatskiy, Russia, Kamchatka State University by Vitus Bering, Petropavlovsk-Kamchatskiy, Russia, ABSTRACT In this paper we consider a model of fractal parametric oscillator. Conducted a phase analysis of the decision model, and built its phase trajectories. Keywords: parametric oscillator, the phase trajectories, the Mittag-Leffler function, the operator Gerasimov – Caputo (1) is the fractional derivative of order 1    2 , I. INTRODUCTION which is defined as t In investigation nonlinear dynamical u   d 1   0t u    systems often use the concept of a fractal, which is   t    1 .  2    0 associated with the study of fractal geometry and processes such as, deterministic chaos, which is (3) consistent with the theory of physics of open systems [1]. The parameters  ,  , u1 , u 2 , defined constants. The development of nonlinear dynamical If in (1) put   0 and     then it is the well systems has led to develop new methods of analysis. One of these is the method of fractional derivatives known equation of fractional oscillator, which is [2]. This method to determine the natural studied in [4]-[6]. In [4] investigated of the fractal phenomenon, in nonlinear dynamic systems, and oscillator was by using the fractional derivatives of other: economic, social, humanitarian. If in this Riemann-Liouville. In [5] and [6] - by using the method change the order of the fractional derivative Caputo operator (3), but the more correct to call it the confirmed the known results, but also study new Gerasimov-Caputo operator. Mention of this results. statement can be found in A. Gerasimov (1948) [7]. Study presents a model of fractal parametric Equation (1) is a generalization of the oscillation system and its phase trajectories. Mathieu equation, which describes the parametric Development the theory of fractal oscillatory systems excitation of oscillation in mechanical systems, as can be a method of Radio physics dynamic processes, well as the related phenomenon of parametric such as ionosferno-magnetospheric plasma. resonance. The system described by equation (1) call fractal parametric oscillator. II. STATEMENT OF THE PROBLEM AND The solution of the problem (1-2) is a Volterra integral equation of the second kind [3] SOLUTION METHOD t In [3], the Cauchy problem for the fractional u  t    K  t    u  d  g  t  . Mathieu equation: to find a solution, u  t  , 0 t 0, T  : Here the kernel K  t,    (t   )  1 E ,    t      cos     and the right side of (2) g  t   u1E ,1   t    u2tE ,2   t   .  0t u       cos t  u  t   0 ,   (1) u  0  u1 , u  0  u2 . (2) (1)k  t  - the     k  1 k 0 Here cos t   E ,1   t      k generalized cosine (function of Mittag-Leffler) with a parameter 1    2 . Put   2 , get the usual cosine, i.e. cos2 t   cos t  . www.ijera.com Note that if in (2) to put   0 , obtain a well-known solution to the equation of fractional oscillator. [6]: u  t   u1E ,1   t    u2tE ,2   t   Solution of the integral equation (2) can be obtained using the composite trapezoidal quadrature formula: The left side of equation 1520 | P a g e
  • 2. Parovik R.I. Int. Journal of Engineering Research and Application ISSN : 2248-9622, Vol. 3, Issue 5, Sep-Oct 2013, pp.1520-1523    D0t E0t, f    E0t, ,    ,  i 1 u1  g1 , ui  i  2,3,..., n ; h  gi  h  j K i , ju j j 1 1 , hK i ,i 2 where D  0t 1 2, j  1 T ; j  . (4) n 1 1, j  1 In (4) needed that the denominator 1  hK i ,i 2  0 . This can always be achieved by reducing the value of the step h . THE PHASE TRAJECTORIES OF FRACTAL PARAMETRIC OSCILLATOR Write the solution (2) as follows: u  t   u1E ,1   t    u2tE ,2   t    0 This equation can be written in following form:   u  t   u1E ,1   t    u2tE ,2   t     E0t, f   , (4) Applying [8], there was used the following operator: t   E0t, f     (t   ) 1 E ,   t     f  d , ,   0 f    cos   u   .   D0t  2    1 differential form  0t 1    D0t D0t1  E0t(, 1), f          E ,1   t    cos   u   d .  (10) 0 Finally, obtain the equation for the derivative of the order   1 : w t   u1 tE ,2   t    u2 t 2 E ,3   t    t     E ,1   t    cos   u   d .  0 (11) Equation (11) is an integral Volterra equation of the second kind, and it can be solved numerically using the method (3). Phase trajectories are based on the respective pairs of points IV. (5) Some properties of (5) are considered in [8]. Apply the Gerasimov-Caputo operator fractional (9) t f   d 1 f      t   1 - the fractional     0 In view of this property and the property (9), obtain:   1  0t1  E0t, f    D0t 2  D0t  E0t, f     ,   ,  t    (t   )  1 E ,   t     cos   u  d .   f   ,  0,   0 , integration operator. The Gerasimov-Caputo operator can be expressed through the fractional integral:  2   1 0t1 f    D0t  D0t f   . t III. www.ijera.com ui , wi  . THE RESULTS OF THE CALCULATIONS In the numerical simulation, for simplicity, put u2  0 and u1    1 . to the solution (4), obtain:   w  t    0t1u     0t1 u1E ,1   t           0t1 u2tE ,2   t      0t1  E0t, f    .  ,    (6) Consider each of the terms in equation (6).    t  k     0t1 u1E ,1   t    u1 0t1    k 0    k  1  k      0t1 t  k     u  tE  t  .  u1   1  ,2     k  1 k 0  k (7) In (7) have used the property [9]:     t   1 .  t  1   0t      Similarly, obtain for the second term in (6)     t   1 .  t  1   0t      (8)    Consider the last term in (6)  0t1  E0t, f   . In  ,  [8] proved the semigroup property of the operator: www.ijera.com Fig. 1. Phase trajectories of: a) a harmonic oscillator and a fractal oscillator   0 : curve 1 -   1.8 , curve 2 -   1.6 , curve 3 -   1.4 ; b): fractal parametric oscillator   2,   1 : curve 1 -   1.8 , curve 2   1.6 , curve 3   1.4 ; c)   1.8,   1 : curve 1 -   1.8 , curve 2 -   1.6 , curve 3 -   1.4 . In Fig. 1 presents phase trajectories with the parameters n  100, t   0,2  for the following cases: (Fig. 1a) harmonic oscillator - a circle, plot with the values of the parameters   2,   0 , the fractal oscillator - (Fig. 1b) fractal parametric oscillator - and (Fig. 1c). Fig. 1a (state trajectory is a circle) corresponds to the classical harmonic oscillations of the system. The phase trajectories of the fractal oscillator are coordinated with phase trajectories plotted in [4]. 1521 | P a g e
  • 3. Parovik R.I. Int. Journal of Engineering Research and Application ISSN : 2248-9622, Vol. 3, Issue 5, Sep-Oct 2013, pp.1520-1523 New results are shown in Fig.1b and Fig.1c. In the first case, for   1,8 and for different values  , the phase trajectories of parametric oscillator are similar to the phase trajectories of fractal oscillator (Fig. 1a), but have a decaying type view of sustainable focus. Seen (Fig. 1b) sometimes are regrouping trajectories. This is due to the properties of the generalized cosine function, which is included in the original equation (1). Phase trajectory in Fig. 1c was plotted with   2 and different values  . In this case phase trajectories have a different view. In Fig. 2 shows the phase trajectory in Fig. 2a and the solution of the original Cauchy problem (1) - (2) According to [4] for the parameter value, the fractional parameter depends on time according to the law. Parameters   0 and g  0 define the limits of values   t  : 1      t   2  g and satisfy inequality g    1 , m – any number. For the calculations were selected parameters: following n  300, t   0,4  ,   0,95, g  0, m  18 . www.ijera.com If changing  from 1 to 2, get different fractional equation (1), each has a family of solutions and properties. This allows us to make the following observation. Notice. In study [4], the authors concluded that the nonlinear signal any oscillating system can be parameterized by a solution of a fractal oscillator. Similarly, can assume that the complex signal represented by a solution of the fractal parametric oscillator. Build a model of a signal f  t  , then by (2) get: t f  t   g  t    K  t    f  d  0  u1E ,1   t    u2tE ,2   t     t      (t   )  1 E ,    t     E ,1    f   d   0 Function values f  t  at discrete points in time are known from the experiment. Then the problem of identification of the model is: to define     u1, u2 , , , t  . In contrast to study [4] the value  also depends on the fractional parameter  , it led more flexibility to present the original signal. This problem is quite complex and deserves attention in the future study of the properties of fractal parametric oscillator. In Fig. 2a shows that the phase trajectory has multiple return points, which corresponds to the results of [4]. In Fig. 2b plotted the calculated curve the shift function. The curve has an oscillating form of constant amplitude. This is due to the introduction in equation (1) the differentiation operator of fractional order  . In Fig. 3 shows the phase trajectory and the offset u  t  for the fractal parametric oscillator. For the calculation put: n  100, t   0,2  , g  0.01,   1,   0.95, k  18,   1.8 . V. VI. In Fig. 3a shows the difference between the phase trajectory of the fractal parametric oscillator and the phase trajectory of the fractal oscillator (Fig. 3a). In this case the phase trajectory is not closed. An offset Acknowledgements This study was performed under the program No 12-I-DPS-16 "Fundamental problems of the impact of powerful radio waves on the atmosphere and the Earth plasmosphere" and with the support of the Ministry of Education and Science of the Russian Federation for the strategic development "Kamchatka State University named after Vitus Bering" for 2012 – 2016 years. REFERENCES u  t  (Fig. 3b) has a more complex structure: more [1] frequent oscillations with variable amplitude. [2] www.ijera.com CONCLUSION Solution the Cauchy problem (1-2) generalizes the well-known solutions for the harmonic oscillator and fractal oscillator. Were plotted phase trajectories. Calculations confirmed the earlier results [4] and led to new results. The phase trajectories of the parametric oscillator differ from the previous ones and have a more complex structure. So there may be non-linear effects in such systems. Suggested that the nonlinear signal can be represented by a fractal parametric oscillator solutions that deserve further study Klimontovich Yu.L. Vvedenie v fiziku otkrytykh system (Мoscow: Yanus-K, 2002). Nakhushev A.M. Drobnoe ischislenie i ego primenenie (Мoscow: Fizmatlit, 2003). 1522 | P a g e
  • 4. Parovik R.I. Int. Journal of Engineering Research and Application ISSN : 2248-9622, Vol. 3, Issue 5, Sep-Oct 2013, pp.1520-1523 [3] [4] [5] [6] [7] [8] [9] www.ijera.com Parovik R.I. Fractal Parametric Oscillator as a Model of a Nonlinear Oscillation System in Natural Mediums, International Journal Communications, Network and System Sciences, 6, 2013, 134-138 Meilanov R.P., Yanpolov M.S. Osobennosti fazovoy traektorii fraktalnogo ostsillyatora, Pisma ZHTF, 1(28), 2002, 67-73. Mainardi F. Fractional relaxation-oscillation and fractional diffusion-wave phenomena, Chaos, Solitons and Fractals, 9(7), 1996, 1461-1477. Nakhusheva V.A. Differentsialnуe uravneniya matematicheskikh modelei nelokalnykh protsesov (Мoscow: Nauka, 2006). Gerasimov A.N. Obobshchenie lineinykh zakonov deformirovaniya i ego primenenie k zadacham vnutrennego treniya, Prikladnaya matematika i mekhanika, 12, 1948, 251-260. Ogorodnikov E.N. Korrektnost zadachi Koshi-Gursa dlya sistemy vyrozhdayushikhsya nagruzhennykh giperbolicheskikh uravnenii v nekotorykh spetsialnykh sluchayakh i ee ravnosilnost zadacham s nelokalnymi kraevymi usloviyami, Vestnik SamGTU. Fiz.-mat. nuki, 26. 2004, 26–38. Kilbas A.A., Srivastava H.M., Trujillo J.J. Theory and Application of Fractional Differential Equations (Amsterdam: Elsevier, 2006). www.ijera.com 1523 | P a g e