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1

Co Hong Tran

Saigon , Vietnam

Member since 5 week(s)

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Personal Information: Date of Birth: 1959 Place of Birth: Saigon Citizenship: Vietnam . I. DEGREES Ph.D. Student ,ASU - Assistant Professor NCU-HUI . M.Sc. Mathematics Applied Mechanics , VNU University of Natural Sciences , HCMC , Vietnam , 2007 .... [More]

Personal Information:
Date of Birth: 1959
Place of Birth: Saigon
Citizenship: Vietnam .




I. DEGREES

Ph.D. Student ,TCU - Assistant Professor NCU-HUI .
M.Sc. Mathematics Applied Mechanics , VNU University of Natural Sciences , HCMC , Vietnam , 2007 .
B.Sc , Mathematics Mechanics , University of Hochiminh city , Vietnam 1981 .


II . EXPOSITIONS AND PAPERS

1. Finite Difference Method and The Lame's Equation in Hereditary Solid Mechanics
2. Investigation of the Power Spectral Density of Duffing's Equation By Equivalent Linearization Method
3. Numerical and Graphical Solutions of Duffing Equation
4. Solving the Vicous Composite Cylinder Problem by Sokolov ' s method
5. The Average Approximating Method on Functional Adjustment Quantity
6. The Relaxation function problem of an orthotropic cylinder
7. The Runge-Kutta Method for Solving Non-linear System of Differential Equations
8. The Solution of a Variable Boundary Problem
9. Vibration in a Cable Hoist


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Hobbies
Mathematics, Classical Music, Reading Books and Camping

PARAMATH , NCUMATHDEPTVIE

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THE SOLUTION STABILITY OF VAN DER POL’S EQUATION .

THE SOLUTION STABILITY OF VAN DER POL’S...', style: 'default'}); this.prototip.show();" onmouseout="this.prototip.remove();">

Pub. on June 24th 2009

11 page(s) - Viewed 29 times

THE SOLUTION STABILITY OF VAN DER POL’S EQUATION .

THE SOLUTION STABILITY OF VAN DER...

THE SOLUTION STABILITY OF VAN DER POL’S EQUATION . by CO. H . TRAN . HUI - NCU HCMC Vietnam coth123@math. com & cohtran@math. com Copyright 2004 November 06 2004... [More]

THE SOLUTION STABILITY OF
VAN DER POL’S EQUATION .

by CO.
H .
TRAN .

HUI - NCU HCMC
Vietnam
coth123@math.
com & cohtran@math.
com
Copyright 2004
November 06 2004
-----------------------------------------------------------------------------------------------------------------------------** Abstract : The Van der Pol differential quation is solved by averaging method .

** Subjects: Vibration Mechanics , The Differential equations .

---------------------------------------------------------------------------------------------------------------Introduction
This worksheet demonstrates Maple s capabilities in finding the graphical solution and dealing with the stability of the steady s
tate solution of Van der Pol s differential equation .

All rights reserved.
Copying or transmitting of this material without the permission of the authors is not allowed .

[Less]

Pub. on June 24th 2009

From Co Hong Tran

Viewed 29 times

11 pages

Numerical and Graphical Solutions of Duffing Equation

Numerical and Graphical Solutions of Duffing...', style: 'default'}); this.prototip.show();" onmouseout="this.prototip.remove();">

Pub. on June 21st 2009

19 page(s) - Viewed 3 times

Numerical and Graphical Solutions of Duffing Equation

Numerical and Graphical Solutions of...

Numerical and Graphical Solutions of Duffing Equation by CO. H . TRAN & PHONG . T . NGO - University of Natural Sciences , HCMC Vietnam coth123@math. com & coth123@yahoo. com Copyright 2006 Jan 06... [More]

Numerical and Graphical
Solutions of Duffing Equation
by CO.
H .
TRAN & PHONG .
T .
NGO - University of Natural Sciences , HCMC
Vietnam coth123@math.
com & coth123@yahoo.
com
Copyright 2006
Jan 06 2006
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------** Abstract : Duffing quation is solved by Runge-Kutta
approximating method .

** Subjects: Vibration Mechanics , The Differential equation .

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------NOTE: This worksheet demonstrates Maple s capabilities in the design of a dynamic system and finding
the numerical solution of the Duffing equation .

All rights reserved.
Copying or transmitting of this material without the permission of
the authors is not allowed .
**********LOI
GIAI SO VA DO THI PHUONG TRÌNH
DUFFING**********
TRAN HONG CO & NGO THANH PHONG - Dai
hoc Khoa hoc tu nhien - tp HCM Vietnam
coth123@math.
com &
coth123@yahoo.
com
A .
Xac dinh he thong .
[ System Definition ]
> restart:
> with(plots):
> interface(warnlevel=0):
B.
Mo hinh dao dong phi tuyen .
[ Non-linear Vibration
Model ]
[Less]

Pub. on June 21st 2009

From Co Hong Tran

Viewed 3 times

19 pages

The Average Approximating Method On Functional Adjustment Quantity For Solving The Volterra Integral Equation II

The Average Approximating Method On...', style: 'default'}); this.prototip.show();" onmouseout="this.prototip.remove();">

Pub. on June 21st 2009

28 page(s) - Viewed 10 times

The Average Approximating Method On Functional Adjustment Quantity For Solving The Volterra Integral Equation II

The Average Approximating Method On...

THE AVERAGE APPROXIMATING METHOD ON FUNCTIONAL ADJUSTMENT QUANTITY FOR SOLVING The Volterra Integral Equation II ( corrected for solving integral equations with Hereditary kernels ) by Co. H Tran ,... [More]

THE AVERAGE APPROXIMATING METHOD ON
FUNCTIONAL ADJUSTMENT QUANTITY FOR
SOLVING
The Volterra Integral Equation II
( corrected for solving integral equations with Hereditary kernels )
by Co.
H Tran , University of Natural Sciences , HCMC Vietnam Institute of Applied Mechanics , HCMC - coth123@math.
com &
coth123@yahoo.
com
Copyright 2004
Sat , November 06 2004
---------------------------------------------------------------------------------------------------** Abstract : Solving the Volterra s integral equation II with
applying the Neumann series and the average approximating method on
functional adjustment quantity .

** Subjects: Viscoelasticity Mechanics , The Integral equation .

----------------------------------------------------------------------------------------------------Copyright
Co.
H Tran -.
The Average Approximating Method on Functional Adjustment
Quantity ( Sokolov s method ) All rights reserved.
No copying or transmitting of
this material is allowed without the prior written permission of Co.
H Tran
The Average Approximating Method on Functional
Adjustment Quantity ( Sokolov s method )
In consideration of The Volterra Integral Equation II ( second kind ) , we find the
explicit expression for the resolvent kernel G ( t , t ) in the general form :
v = ( 1 + lK* ) u
here l : arbitrary parameter .
The solution of u can be represented with the
Neumann series : .

[Less]

Pub. on June 21st 2009

From Co Hong Tran

Viewed 10 times

28 pages

Vibration In A Cable Hoist.

Vibration In A Cable Hoist.', style: 'default'}); this.prototip.show();" onmouseout="this.prototip.remove();">

Pub. on June 21st 2009

9 page(s) - Viewed 23 times

Vibration In A Cable Hoist.

Vibration In A Cable Hoist.

VIBRATION IN A CABLE HOIST. by CO. H . TRAN - NCU - HUI , HCMC Vietnam mailto:coth123@math. com cohtran@math. com Copyright 2007 March 06 2007... [More]

VIBRATION IN A CABLE
HOIST.

by CO.
H .
TRAN - NCU - HUI , HCMC Vietnam mailto:coth123@math.
com cohtran@math.
com
Copyright 2007
March 06 2007
-------------------------------------------------------------------------------------------** Abstract : We consider the non-linear random vibration
model described by the system of differential equations .

The solution can be found by using the inverse Laplace transformation .

** Subjects: Vibration Mechanics , The Differential equations .

-----------------------------------------------------------------------------------------------------------------------------------------NOTE:
This worksheet demonstrates Maple s capabilities in the design and finding
the numerical solution of the non-linear vibration system .

All rights reserved.
Copying or transmitting of this material without the
permission of the authors is not allowed .

1.
Model Definition .

Voltage supply : V
Switch : S
Geartrain : G
Motor : M .

Drum : D
Cable : C
Elevator cage : E
( Fig.
1)
The cage E is hoisted by cable C wound over a drum D driven through a gear-set G by an electric motor M .

Assume that :
[Less]

Pub. on June 21st 2009

From Co Hong Tran

Viewed 23 times

9 pages

The Non-Linear Vibration Model

The Non-Linear Vibration Model', style: 'default'}); this.prototip.show();" onmouseout="this.prototip.remove();">

Pub. on June 21st 2009

29 page(s) - Viewed 21 times

The Non-Linear Vibration Model

The Non-Linear Vibration Model

THE NON-LINEAR VIBRATION MODEL by CO. H . TRAN - University of Natural Sciences , HCMC Vietnam coth123@math. com & coth123@yahoo. com Copyright 2006 Feb 06 2006... [More]

THE NON-LINEAR
VIBRATION MODEL
by CO.
H .
TRAN - University of Natural Sciences , HCMC Vietnam coth123@math.
com & coth123@yahoo.
com
Copyright 2006
Feb 06 2006
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------** Abstract : The system of non-linear differential quations is
solved by Runge-Kutta method .

** Subjects: Vibration Mechanics , The Differential equations .

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------NOTE: This worksheet demonstrates Maple s capabilities in the design and finding the numerical solution
of the non-linear vibration system .

All rights reserved.
Copying or transmitting of this material without the permission of
the authors is not allowed .

LOI GIAI SO VA DO THI CUA
MAU DAO DONG
PHI TUYEN
TRAN HONG CO - Dai hoc Khoa hoc tu nhien - tp
HCM Vietnam
coth123@math.
com &
coth123@yahoo.
com
A .
Xac dinh he thong .
[ System Definition ]
B.
Mo hinh dao dong .
[ Vibration Model ]
Khao sat mau vat the dang giai tich co hinh mo phong nhu tren [ Consider an analytical
model which has the simulation figure above ]
He phuong trinh vi phan chuyen dong : [ System of differential equations ]
[Less]

Pub. on June 21st 2009

From Co Hong Tran

Viewed 21 times

29 pages

Finite Difference Method And The Lame's Equation In Hereditary Solid Mechanics

Finite Difference Method And The Lame's...', style: 'default'}); this.prototip.show();" onmouseout="this.prototip.remove();">

Pub. on June 21st 2009

9 page(s) - Viewed 24 times

Finite Difference Method And The Lame's Equation In Hereditary Solid Mechanics

Finite Difference Method And The Lame's...

FINITE DIFFERENCE METHOD AND THE LAME S EQUATION IN HEREDITARY SOLID MECHANICS . by Co. H Tran & Phong . T . Ngo , University of Natural Sciences , HCMC Vietnam - coth123@math. com , coth123@yahoo.... [More]

FINITE DIFFERENCE METHOD
AND
THE LAME S EQUATION IN
HEREDITARY SOLID MECHANICS .

by Co.
H Tran & Phong .
T .
Ngo , University of Natural Sciences , HCMC Vietnam - coth123@math.
com , coth123@yahoo.
com & ntphong_6@yahoo.
com
Copyright 2005
Sat , May 15 2005
---------------------------------------------------------------------------------------------------** Abstract : The Lame s differential equation is solved by the finite-difference method .

** Subjects: Viscoelasticity , Hereditary Solid Mechanics , The Differential equation .

----------------------------------------------------------------------------------------------------NOTE: This worksheet demonstrates the use of Maple for calculating the solution of Lame s differential
equation .

The authors expect that this worksheet will only be used for teaching and educational purposes .
.

Copyright
Co.
H Tran - Phong .
T .
Ngo - FINITE DIFFERENCE METHOD AND
THE LAME S EQUATION IN HEREDITARY SOLID MECHANICS .
Use Maple 9.
5
.
All rights reserved.
Copying or transmitting of this material without the permission of the authors is not
allowed .

A.
THE DISPLACEMENT DIFFERENTIAL
EQUATION :
The Lame s equation of the plane-deformation problem in the cylinder made of orthotropic viscoelastic
composite material does not have constant modules .

The modules Et , Er and Ert will be replaced with the functions Er(t) , Et(t) and Ert(t) respectively .

<>TRANHONGCO--FINITE DIFFERENCE METHOD AND THE LAME S EQUATION IN HEREDITARY SOLID MECHANICS
[Less]

Pub. on June 21st 2009

From Co Hong Tran

Viewed 24 times

9 pages

The Solution Of A Variable Boundary Problem

The Solution Of A Variable Boundary Problem', style: 'default'}); this.prototip.show();" onmouseout="this.prototip.remove();">

Pub. on June 21st 2009

25 page(s) - Viewed 21 times

The Solution Of A Variable Boundary Problem

The Solution Of A Variable Boundary...

THE SOLUTION OF A VARIABLE BOUNDARY PROBLEM Co. H. Tran - Phong . T. Ngo Faculty of Mathematics, University of Natural Sciences - VNU-HCM coth123@math. com & cohtran@math. com Copyright 2007 August... [More]

THE SOLUTION OF A VARIABLE BOUNDARY
PROBLEM
Co.
H.
Tran - Phong .
T.
Ngo
Faculty of Mathematics, University of Natural Sciences - VNU-HCM
coth123@math.
com & cohtran@math.
com
Copyright 2007
August 16 2007
NOTE:
This worksheet demonstrates Maple s capabilities in researching the numerical and graphical solution of the
variable boundary problem of a thick-walled cylinder of material enclosed in a thin metallic shell .

All rights reserved.
Copying or transmitting of this material without the permission of the authors is not
allowed .

Abstract :
The relations between stress and strain in linear viscoelastic theory are discussed from the viewpoint of
application to problems of stress analysis.
This consideration includes some important differences from the
estimation of linear viscoelastic laws for the representation of material properties , and the integral operators
expressing the creep function or relaxation function can be applied .
By using of the differential operator for the
relation between stress and strain it is usually most convenient to solve some problems which have the variable
boundary .

Problem Definition
We consider a thick-walled cylinder of material enclosed in a thin metallic shell .
( Fig.
1)
[Less]

Pub. on June 21st 2009

From Co Hong Tran

Viewed 21 times

25 pages

Numerical - Graphical Solutions Of The Non-Linear Vibration Model with discrete data input

Numerical - Graphical Solutions Of The...', style: 'default'}); this.prototip.show();" onmouseout="this.prototip.remove();">

Pub. on June 21st 2009

13 page(s) - Viewed 20 times

Numerical - Graphical Solutions Of The Non-Linear Vibration Model with discrete data input

Numerical - Graphical Solutions Of The...

NUMERICAL - GRAPHICAL SOLUTIONS OF THE NON-LINEAR VIBRATION MODEL with discrete data input by CO. H . TRAN University of Natural Sciences, HCMC Vietnam coth123@math. com & coth123@yahoo. com Copyright... [More]

NUMERICAL - GRAPHICAL SOLUTIONS OF THE
NON-LINEAR VIBRATION MODEL
with discrete data input
by CO.
H .
TRAN
University of Natural Sciences,
HCMC Vietnam
coth123@math.
com & coth123@yahoo.
com
Copyright 2007
May 06 2007
Abstract : The system of non-linear differential quations with discrete input function is solved by Runge-Kutta method
.

Subjects: Vibration Mechanics , The Differential equations .

NOTE: This worksheet demonstrates Maple s capabilities in the design and finding the numerical solution of the non-linear vibration system .

All rights reserved.
Copying or transmitting of this material without the permission of the authors is not allowed .

LOI GIAI SO VA DO THI CUA MAU
DAO DONG PHI TUYEN
voi so lieu roi rac
TRAN HONG CO
Dai hoc Khoa hoc tu nhien
tp HCM Vietnam
coth123@math.
com & coth123@yahoo.
com
Step 1 : System Definition.

> restart:
eq1:=(m1+m2)*Diff(y,t$2)*l*cos(phi)+(m1*l^2+J)*Diff(phi,t$2)+m1*g*l*cos(phi)=f(t);eq2:=(m1+m2)*Diff(y,t$2)+m1*l*cos(phi)
*Diff(phi,t$2)-m1*l*Diff(phi,t)^2*cos(phi)+b*Diff(y,t)+c1*y+c3*y^3 =h(t);
(1.
1)
[Less]

Pub. on June 21st 2009

From Co Hong Tran

Viewed 20 times

13 pages

Solving The Viscous Composite Cylinder Problem By Sokolov’s Method

Solving The Viscous Composite Cylinder...', style: 'default'}); this.prototip.show();" onmouseout="this.prototip.remove();">

Pub. on June 21st 2009

12 page(s) - Viewed 22 times

Solving The Viscous Composite Cylinder Problem By Sokolov’s Method

Solving The Viscous Composite Cylinder...

1 SOLVING THE VISCOUS COMPOSITE CYLINDER PROBLEM BY SOKOLOV’S METHOD By CO . H . TRAN , PHONG . T. NGO Faculty of Mathematics & Informatics , University of Natural Sciences – VNU-HCM Abstract... [More]

1
SOLVING THE VISCOUS
COMPOSITE CYLINDER
PROBLEM BY SOKOLOV’S
METHOD
By CO .
H .
TRAN , PHONG .
T.

NGO
Faculty of Mathematics & Informatics , University of Natural
Sciences – VNU-HCM
Abstract : The paper presents some thoughts about the plane strain problem of the
viscous orthotropic composite materials cylinder under internal and external
pressure with
respect to using the average approximating method .
To compute the interior stress ,
from the elastic solution we use the Volterra’s principle and Sokolov’s method in the
corresponding integral equation to find the viscous solution .

I.
The axial symmetric plane strain problem of cylinder :
We examine an orthotropic viscoelastic composite material cylinder which has the
horizontal section within limit of 2 circles : r = a , r = b ( a < b ) . <>TRANHONGCO --GIAI BAI TOAN ONG TRU COMPOSITE DAN NHOT BANG PHUONG PHAP SOKOLOV .

[Less]

Pub. on June 21st 2009

From Co Hong Tran

Viewed 22 times

12 pages

The Relaxation function problem of an orthotropic cylinder .

The Relaxation function problem of an...', style: 'default'}); this.prototip.show();" onmouseout="this.prototip.remove();">

Pub. on June 19th 2009

17 page(s) - Viewed 27 times

The Relaxation function problem of an orthotropic cylinder .

The Relaxation function problem of an...

· For Engineering Design For Scientific Research For Operations Research For Financial Analysis For Academic Instruction For Academic Research For Students For Testing & Assessment Maple 13 MapleSim 2 Maple... [More]

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[Less]

Pub. on June 19th 2009

From Co Hong Tran

Viewed 27 times

17 pages

Equivalent Linearization Method

Equivalent Linearization Method ', style: 'default'}); this.prototip.show();" onmouseout="this.prototip.remove();">

Pub. on June 12th 2009

7 page(s) - Viewed 103 times

Equivalent Linearization Method

Equivalent Linearization Method

***INVESTIGATING ON THE POWER SPECTRAL DENSITY OF DUFFING’S EQUATION BY EQUIVALENT LINEARIZATION METHOD By CO . H . TRAN . Faculty of Mathematics & Informatics , University of Natural Sciences –... [More]

***INVESTIGATING ON THE POWER SPECTRAL
DENSITY OF DUFFING’S EQUATION
BY EQUIVALENT LINEARIZATION METHOD
By CO .
H .
TRAN .

Faculty of Mathematics & Informatics , University of Natural Sciences – VNU-HCM
Abstract :
We consider the non-linear random vibration model demonstrated by the Duffing’s differential
equation :
)( 2" 32
00 tfxxxx =+++ μβωξω
(*)
The stationary random process is f( t) which is satisfied <> = 0
with the spectral density function Sf ( ω ) .
To find the solution Sx ( ω ) of (*) we use the
equivalent linearization method .

1/.
Model Definition :
The non-linear random vibration model includes the mass (m) - dashpot (c) -spring (k)
( fig.
1 ) .
This model moves on the rough surface which is described by the random variable y(s)
with the constant velocity v .
If we have the relation s = vt and the mass m is also
influenced under the non-linear stimulating force , then the vibration differential equation
of the mass m can be rewritten as :
3
xμβ
( 1.
0 )
)( 2" 32
00 tfxxxx =+++ μβωξω
( fig .
1)
2/.
The equivalent linearization method .

[Less]

Pub. on June 12th 2009

From Co Hong Tran

Viewed 103 times

7 pages

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