How to create and solve finite element models?
Application to 2nd Order Differential Equations!
#WikiCourses #FEM
https://wikicourses.wikispaces.com/TopicX+Element+Equations
FEM: Introduction and Weighted Residual MethodsMohammad Tawfik
What are weighted residual methods?
How to apply Galerkin Method to the finite element model?
#WikiCourses #Num001
https://wikicourses.wikispaces.com/TopicX+Approximate+Methods+-+Weighted+Residual+Methods
What is a multiple dgree of freedom (MDOF) system?
How to calculate the natural frequencies?
What is a mode shape?
What is the dynamic stiffness matrix approach?
#WikiCourses
https://wikicourses.wikispaces.com/Lect04+Multiple+Degree+of+Freedom+Systems
https://eau-esa.wikispaces.com/Topic+Multiple+Degree+of+Freedom+%28MDOF%29+Systems
What is numerical differentiation?
What is finite difference?
How to apply that to boundary value problems?
#WikiCourses #Num001
https://wikicourses.wikispaces.com/Topic+Boundary+Value+Problems+-+Finite+Difference
How to handle a system of initial value problems using Runge-Kutta method?
#WikiCourses #Num001
https://wikicourses.wikispaces.com/Topic+Initial+Value+Problems
FEM: Introduction and Weighted Residual MethodsMohammad Tawfik
What are weighted residual methods?
How to apply Galerkin Method to the finite element model?
#WikiCourses #Num001
https://wikicourses.wikispaces.com/TopicX+Approximate+Methods+-+Weighted+Residual+Methods
What is a multiple dgree of freedom (MDOF) system?
How to calculate the natural frequencies?
What is a mode shape?
What is the dynamic stiffness matrix approach?
#WikiCourses
https://wikicourses.wikispaces.com/Lect04+Multiple+Degree+of+Freedom+Systems
https://eau-esa.wikispaces.com/Topic+Multiple+Degree+of+Freedom+%28MDOF%29+Systems
What is numerical differentiation?
What is finite difference?
How to apply that to boundary value problems?
#WikiCourses #Num001
https://wikicourses.wikispaces.com/Topic+Boundary+Value+Problems+-+Finite+Difference
How to handle a system of initial value problems using Runge-Kutta method?
#WikiCourses #Num001
https://wikicourses.wikispaces.com/Topic+Initial+Value+Problems
How to best-fit a function to a given set of data?
Why is this different from interpolation?
Do you have more than one independent variable?
Learn about regression and least squares method!
#WikiCourses #Num001
https://wikicourses.wikispaces.com/Topic+Regression
How to derive the finite element model using the stationary functional approach?
Application to bars and beams!
#WikiCourses
https://wikicourses.wikispaces.com/TopicX+Stationary+Functional+Approach
https://eau-esa.wikispaces.com/Topic+Stationary+Functional+Approach
How to find the roots of Nonlinear Equations?
Newton-Raphson method is not the only way!
How about a system of nonlinear equations?
#WikiCourses
https://wikicourses.wikispaces.com/Topic+Roots+of+Nonlinear+Equations
FEM: Nonlinear Beam Deflection Model (with Temperature)Mohammad Tawfik
Derivation and solution of the nonlinear finite element model of a beam under thermal loading.
#WikiCourses
https://wikicourses.wikispaces.com/TopicX+Nonlinear+Solid+Mechanics
https://eau-esa.wikispaces.com/Topic+Nonlinear+Solid+Mechanics
Solve nonlinear equations using bracketing methods: Bisection and False Position
#WikiCourses
https://wikicourses.wikispaces.com/Topic+Roots+of+Nonlinear+Equations
How to interpolate data with slopes?
How to interpolate data involving more than one independent variable?
A Generalized Approach to Interpolation
#WikiCourses
https://wikicourses.wikispaces.com/Topic+Interpolation
How to handle Initial Value Problems using numerical techniques?
#WikiCourses
https://wikicourses.wikispaces.com/Topic+Initial+Value+Problems
https://eau-esa.wikispaces.com/Topic+Initial+Value+Problems
What is interpolation?
How to interpolate a polynomial through a given set of data?
General approach, Newton method, Lagrange method
#WikiCourses
https://wikicourses.wikispaces.com/Topic+Interpolation
Numerical Response for Initial Value Problems using Newmark Method.
#WikiCourses
https://wikicourses.wikispaces.com/Topic+Initial+Value+Problems
https://eau-esa.wikispaces.com/Topic+Initial+Value+Problems
How to best-fit a function to a given set of data?
Why is this different from interpolation?
Do you have more than one independent variable?
Learn about regression and least squares method!
#WikiCourses #Num001
https://wikicourses.wikispaces.com/Topic+Regression
How to derive the finite element model using the stationary functional approach?
Application to bars and beams!
#WikiCourses
https://wikicourses.wikispaces.com/TopicX+Stationary+Functional+Approach
https://eau-esa.wikispaces.com/Topic+Stationary+Functional+Approach
How to find the roots of Nonlinear Equations?
Newton-Raphson method is not the only way!
How about a system of nonlinear equations?
#WikiCourses
https://wikicourses.wikispaces.com/Topic+Roots+of+Nonlinear+Equations
FEM: Nonlinear Beam Deflection Model (with Temperature)Mohammad Tawfik
Derivation and solution of the nonlinear finite element model of a beam under thermal loading.
#WikiCourses
https://wikicourses.wikispaces.com/TopicX+Nonlinear+Solid+Mechanics
https://eau-esa.wikispaces.com/Topic+Nonlinear+Solid+Mechanics
Solve nonlinear equations using bracketing methods: Bisection and False Position
#WikiCourses
https://wikicourses.wikispaces.com/Topic+Roots+of+Nonlinear+Equations
How to interpolate data with slopes?
How to interpolate data involving more than one independent variable?
A Generalized Approach to Interpolation
#WikiCourses
https://wikicourses.wikispaces.com/Topic+Interpolation
How to handle Initial Value Problems using numerical techniques?
#WikiCourses
https://wikicourses.wikispaces.com/Topic+Initial+Value+Problems
https://eau-esa.wikispaces.com/Topic+Initial+Value+Problems
What is interpolation?
How to interpolate a polynomial through a given set of data?
General approach, Newton method, Lagrange method
#WikiCourses
https://wikicourses.wikispaces.com/Topic+Interpolation
Numerical Response for Initial Value Problems using Newmark Method.
#WikiCourses
https://wikicourses.wikispaces.com/Topic+Initial+Value+Problems
https://eau-esa.wikispaces.com/Topic+Initial+Value+Problems
Why would a company hire a trainer? To produce a change. The trainer by default is
an agent for change. Regardless of any results a trainer may accomplish, the bottom line is a
measurable change in employees’ performance.
What is marketing?
How to find out about customers?
How to reach them?
How to get them to know about you?
What is a product life cycle?
How about Marketing strategies?
Learn more ...
http://AcademyOfKnowledge.org
Brief description of current state of drones and some future challenges.
The presentation is prepared for delivery in the "Interact with Today's World" conference held in Bibliotica Alexandria 5-6 August 2016
Finite Element Analysis of the Beams Under Thermal LoadingMohammad Tawfik
A report on the finite element analysis of a beam under thermal loading. Nonlinear deflections and solution procedures covered.
#WikiCourses
https://wikicourses.wikispaces.com/TopicX+Nonlinear+Solid+Mechanics
https://eau-esa.wikispaces.com/Topic+Nonlinear+Solid+Mechanics
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
How to Create Map Views in the Odoo 17 ERPCeline George
The map views are useful for providing a geographical representation of data. They allow users to visualize and analyze the data in a more intuitive manner.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
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This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
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Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
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For more information, visit-www.vavaclasses.com
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Bills have a main role in point of sale procedure. It will help to track sales, handling payments and giving receipts to customers. Bill splitting also has an important role in POS. For example, If some friends come together for dinner and if they want to divide the bill then it is possible by POS bill splitting. This slide will show how to split bills in odoo 17 POS.
1. 2nd order DE’s in 1-D
Mohammad Tawfik
#WikiCourses
http://WikiCourses.WikiSpaces.com
Introduction to the Finite
Element Method
2nd order DE’s in 1-D
2. 2nd order DE’s in 1-D
Mohammad Tawfik
#WikiCourses
http://WikiCourses.WikiSpaces.com
Objectives
• Understand the basic steps of the finite
element analysis
• Apply the finite element method to second
order differential equations in 1-D
3. 2nd order DE’s in 1-D
Mohammad Tawfik
#WikiCourses
http://WikiCourses.WikiSpaces.com
The Mathematical Model
• Solve:
• Subject to:
Lx
fcu
dx
du
a
dx
d
0
0
00 ,0 Q
dx
du
auu
Lx
4. 2nd order DE’s in 1-D
Mohammad Tawfik
#WikiCourses
http://WikiCourses.WikiSpaces.com
Step #1: Discretization
• At this step, we divide
the domain into
elements.
• The elements are
connected at nodes.
• All properties of the
domain are defined at
those nodes.
5. 2nd order DE’s in 1-D
Mohammad Tawfik
#WikiCourses
http://WikiCourses.WikiSpaces.com
Step #2: Element Equations
• Let’s concentrate our
attention to a single
element.
• The same DE applies
on the element level,
hence, we may follow
the procedure for
weighted residual
methods on the
element level!
21
0
xxx
fcu
dx
du
a
dx
d
21
2211
21
,
,,
Q
dx
du
aQ
dx
du
a
uxuuxu
xxxx
6. 2nd order DE’s in 1-D
Mohammad Tawfik
#WikiCourses
http://WikiCourses.WikiSpaces.com
Polynomial Approximation
• Now, we may propose an approximate
solution for the primary variable, u(x),
within that element.
• The simplest proposition would be a
polynomial!
7. 2nd order DE’s in 1-D
Mohammad Tawfik
#WikiCourses
http://WikiCourses.WikiSpaces.com
Polynomial Approximation
• Interpolating the values
of displacement
knowing the nodal
displacements, we may
write:
01 bxbxu
01111 bxbuxu
2
12
1
1
12
2
u
xx
xx
u
xx
xx
xu
02122 bxbuxu
8. 2nd order DE’s in 1-D
Mohammad Tawfik
#WikiCourses
http://WikiCourses.WikiSpaces.com
Polynomial Approximation
e
ux
u
u
uu
u
xx
xx
u
xx
xx
xu
2
1
212211
2
12
1
1
12
2
9. 2nd order DE’s in 1-D
Mohammad Tawfik
#WikiCourses
http://WikiCourses.WikiSpaces.com
Step #2: Element Equations
(cont’d)
• Assuming constant
domain properties:
• Applying the
Galerkin method:
21
2
2
0
xxx
fcu
dx
ud
a
02
2
Domain
jiiji
i
j dxfxuxxcu
dx
xd
xa
10. 2nd order DE’s in 1-D
Mohammad Tawfik
#WikiCourses
http://WikiCourses.WikiSpaces.com
Step #2: Element Equations
(cont’d)
• Note that:
• And:
ee hdx
xd
hdx
xd 1
,
1 21
Domain
ij
x
x
i
j
Domain
i
j
dx
dx
xd
dx
xd
a
dx
xd
xa
dx
dx
xd
xa
2
1
2
2
11. 2nd order DE’s in 1-D
Mohammad Tawfik
#WikiCourses
http://WikiCourses.WikiSpaces.com
Step #2: Element Equations
(cont’d)
• For i=j=1: (and ignoring boundary terms)
• Which gives:
0
12
1
2
1
2
2
2
x
x eee
dx
h
xx
fu
h
xx
c
h
a
0
23
1
ee
e
fh
u
ch
h
a
12. 2nd order DE’s in 1-D
Mohammad Tawfik
#WikiCourses
http://WikiCourses.WikiSpaces.com
Step #2: Element Equations
(cont’d)
• Repeating for all terms:
• The above equation is called the element
equation.
1
1
221
12
611
11
2
1 ee
e
fh
u
uch
h
a
13. 2nd order DE’s in 1-D
Mohammad Tawfik
#WikiCourses
http://WikiCourses.WikiSpaces.com
What happens for adjacent
elements?
14. 2nd order DE’s in 1-D
Mohammad Tawfik
#WikiCourses
http://WikiCourses.WikiSpaces.com
Objectives
• Learn how the finite element model for the
whole domain is assembled
• Learn how to apply boundary conditions
• Solving the system of linear equations
15. 2nd order DE’s in 1-D
Mohammad Tawfik
#WikiCourses
http://WikiCourses.WikiSpaces.com
Recall
• In the previous lecture, we obtained the
element equation that relates the element
degrees of freedom to the externally
applied fields
• Which maybe written:
1
1
221
12
611
11
2
1 ee
e
fh
u
uch
h
a
2
1
2
1
43
21
f
f
u
u
kk
kk
16. 2nd order DE’s in 1-D
Mohammad Tawfik
#WikiCourses
http://WikiCourses.WikiSpaces.com
Two–Element example
1
2
1
1
1
2
1
1
1
4
1
3
1
2
1
1
f
f
u
u
kk
kk
2
2
2
1
2
2
2
1
2
4
2
3
2
2
2
1
f
f
u
u
kk
kk
3
2
1
3
2
1
3
2
1
2
4
2
3
2
2
2
1
1
4
1
3
1
2
1
1
0
0
Q
Q
Q
f
f
f
u
u
u
kk
kkkk
kk
17. 2nd order DE’s in 1-D
Mohammad Tawfik
#WikiCourses
http://WikiCourses.WikiSpaces.com
Illustration: Bar application
1. Discretization: Divide the bar into N number of
elements. The length of each element will be
(L/N)
2. Derive the element equation from the differential
equation for constant properties an externally
applied force:
02
2
xF
x
u
EA
0
2
1
2
x
x
ij
ij
e
dxfu
dx
d
dx
d
h
EA
18. 2nd order DE’s in 1-D
Mohammad Tawfik
#WikiCourses
http://WikiCourses.WikiSpaces.com
Performing Integration:
1
1
211
11
2
1 e
e
e
e
fh
u
u
h
EA
Note that if the integration is evaluated from 0 to he,
where he is the element length, the same results
will be obtained.
0
2
1
2
x
x
ij
ij
e
dxfu
dx
d
dx
d
h
EA
19. 2nd order DE’s in 1-D
Mohammad Tawfik
#WikiCourses
http://WikiCourses.WikiSpaces.com
Two–Element bar example
1
2
1
1
1
2
1
1
11
11
f
f
u
u
h
EA
e
2
2
2
1
2
2
2
1
11
11
f
f
u
u
h
EA
e
0
0
1
2
1
2
110
121
011
3
2
1 R
fh
u
u
u
h
EA e
e
20. 2nd order DE’s in 1-D
Mohammad Tawfik
#WikiCourses
http://WikiCourses.WikiSpaces.com
Applying Boundary Conditions
21. 2nd order DE’s in 1-D
Mohammad Tawfik
#WikiCourses
http://WikiCourses.WikiSpaces.com
Applying BC’s
• For the bar with fixed left side and free
right side, we may force the value of the
left-displacement to be equal to zero:
0
0
1
2
1
2
0
110
121
011
3
2
R
fh
u
u
h
EA e
e
22. 2nd order DE’s in 1-D
Mohammad Tawfik
#WikiCourses
http://WikiCourses.WikiSpaces.com
Solving
• Removing the first row and column of the
system of equations:
• Solving:
1
2
211
12
3
2 e
e
fh
u
u
h
EA
4
3
2
2
3
2
EA
fh
u
u e
23. 2nd order DE’s in 1-D
Mohammad Tawfik
#WikiCourses
http://WikiCourses.WikiSpaces.com
Secondary Variables
• Using the values of the displacements
obtained, we may get the value of the
reaction force:
0
0
1
2
1
2
2
4
2
3
0
110
121
011 R
fh
fh
fh e
e
e
24. 2nd order DE’s in 1-D
Mohammad Tawfik
#WikiCourses
http://WikiCourses.WikiSpaces.com
Secondary Variables
• Using the first equation, we get:
• Which is the exact value of the reaction
force.
R
fhfh ee
22
3
efhR 2
25. 2nd order DE’s in 1-D
Mohammad Tawfik
#WikiCourses
http://WikiCourses.WikiSpaces.com
Summary
• In this lecture, we learned how to
assemble the global matrices of the finite
element model; how to apply the boundary
conditions, and solve the system of
equations obtained.
• And finally, how to obtain the secondary
variables.