User:EML4500.f08.FEABBQ.Hamdan/HW-1

Topics covered

 * 1) Class info
 * 2) WikiMedia
 * 3) Teams

1- Class info:


 * Syllabus:

Instructor :
 * Dr. L. Vu-Quoc,
 * Tel: 392-6227
 * E-mail:vu-quoc@ufl.edu
 * Office: NEB 135 (New Engineering Building)
 * Classroom: FLG 270
 * Class time: MWF, period 8 (3:00pm - 3:50pm)
 * Office hours: MWF, period 9 (4:05pm - 4:55pm)
 * web site: WWW.mae.ufl.edu/~vql

TAs:
 * 1)Nicolas Vigroux
 * Office: NEB 109, Tue, periods 3 and 4 (9:35am - 11:30am)
 * Tel: 846-3027
 * E-mail: nvigroux@ufl.edu


 * 2)Sung-Uk Zhang
 * Office: NEB 109,Thu, periods 6 and 7 (12:50pm - 13:40pm)
 * Tel: 392-3347
 * E-mail: zsunguk@ufl.edu

Exams Schedule:
 * 1) There are no scheduled make-up exams
 * 2) All exams are closed books, closed notes
 * 3) with a 4.25"x5.5" (half a letter-size paper) formula sheet allowed (handwritten)
 * 4) calculators can solve systems of linear simultaneous equations
 * 5) NOT allowed are laptops and any hand-held devices

Exam Dates:
 * 1) Exam 1: Wed, 24 Sep 2008
 * 2) Exam 2: Wed, 22 Oct 2008
 * 3) Exam 3: Wed, 03 Dec 2008


 * The grading will be 23% for every exam and 31% for the homework and projects.


 * to log on the class website:
 * 1) www.mae.ufl.edu/~vql
 * 2) Teaching
 * 3) Course website
 * 4) EMl4500
 * 5) Pass Word is: (fall08.wiki)

2- Wikimedia

Each member of a team has to create an account with Wikiversity using the format: (EML4500.f08.TEAMNAME.LASTNAME)

The idea of using wiki comes for many reasons:


 * Wiki is free
 * The articles are written by users
 * Can be edited
 * Previous versions of the article are available in the history or archive
 * Can be accessed from anywhere
 * Can be used on an international level
 * Stronger servers,( stronger than ELS ... )

3- Teams


 * Five to six people per group
 * Team Name: 4 to 6 characters
 * Email the TA:
 * Team Name
 * Members Name
 * UF ID Numbers


 * The team will work on homework and projects together to create a wiki page for every home work including all lecture notes associated in solving the homework. the team will have a coordinator/ leader that will email the archived link of the homework to the TAs at a specified time. the stamped time on the archived has to be before the deadline. The archived version will never be changed!! team members also will evaluating each other on every project.


 * The class had a major problem with the accounts on Wikipedia and we had to use Wikiversity instead. it works the same and give the same benefits to the class

==schematics of trusses FBD

Figure 1


=Steps to solve simple truss system described above=

1 Global Picture (description) at structure level


 * Global degrees of freedom (disp. dofs)
 * Global Forces

Actually the diso dofs are partitioned into:
 * a known part e.g., fixed dofs
 * an unknown part solved using FEA

Similarly for the global forces:
 * a know part, Applied Forces
 * an unknown part, Reactions

2 Element Picture:
 * Elem dofs
 * Elem forces

3 Global FD relationship
 * Elem stiffness matrices in global coord. sys.
 * Elem force matrices in global cooerd. sys.
 * Assembly of elem stiffness matrices and element forces matrices into global FD relation:

K.d=F

4 elimination of known dofs to reduce the global FD relation

5 Compare element forces from now known d

6 compare reactions (unknown forces)

Scalar functions
built in functions that operate on scalars or individual elements of a matrix. The most commonly used of these functions are as follows:


 * sin
 * asin (arcsin)
 * exp (exponential)
 * abs
 * round
 * cos
 * acos (arccos)
 * log (natural log)
 * sqrt
 * floor
 * tan
 * atan (arctan)
 * rem (remainder from division)
 * sign
 * ceil

Vector functions
functions perform actions on vectors in a "column by column" fashion and produce a row vector. The transpose can be used to operate on a row by row basis. Some of those functions are:


 * max
 * min
 * sort
 * sum
 * prod
 * median
 * mean
 * std
 * any
 * all

Matrix functions
The following is a list of matrix functions for Matlab. These functions can be accessed using different commands.
 * eig                (eigenvalues and eigenvectors)
 * chol               (cholesky factorization)
 * svd                (singular value decomposition)
 * inv                (inverse)
 * lu                 (LU factorization)
 * qr                 (QR factorization)
 * hess               (hessenberg form)
 * schur              (schur decomposition)
 * rref               (reduced row echelon form)
 * expm               (matrix exponential)
 * sqrtm              (matrix square root)
 * poly               (characteristic polynomial)
 * det                (determinant)
 * size               (size)
 * norm               (1-norm, 2-norm F-norm)
 * cond               (condition number in the 2-form)
 * rank               (rank)

Command line editing and recall
Matlab Editing and function keys:


 * left/right arrows scrolls the cursor left and right


 * up/down arrows scrolls up and down from line to line


 * backspace deletes the character left of the cursor


 * delete deletes the character left of the cursor


 * home moves the cursor to the beginning of the line


 * end moves the cursor to the end of the line

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