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Matlab Assignment 8

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F11Carrie

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Unread post Mon Nov 21, 2011 11:25 am

Matlab Assignment 8

The assignment file that was emailed out has a typo in Problem 2. The label should be "Torque" rather than "PointForce." Using something like "PureTorque" might make parsing simpler - also more precise.
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Dan Negrut

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Unread post Mon Nov 21, 2011 4:26 pm

Re: Matlab Assignment 8

F11Carrie wrote:The assignment file that was emailed out has a typo in Problem 2. The label should be "Torque" rather than "PointForce." Using something like "PureTorque" might make parsing simpler - also more precise.

Amen to that.
Dan
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F11Jonathan

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Unread post Tue Nov 22, 2011 5:19 pm

Re: Matlab Assignment 8

Here is my coefficient matrix.

New Bitmap Image.jpg
New Bitmap Image.jpg (115.98 KiB) Viewed 7381 times


Qa =[0 -19.6 2.5 5 -19.6 0]'

The horizontal force does not create a torque in the initial horizontal arrangement
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F11Wendy

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Unread post Sun Nov 27, 2011 5:29 pm

Re: Matlab Assignment 8

Here's my coefficient matrix and RHS
eq.jpg
eq.jpg (60.49 KiB) Viewed 7325 times


Also note: I believe part (f) in the homework has a typo. Q2A is only 3 dimensional, not 6.
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F11Sarah

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Unread post Mon Nov 28, 2011 1:41 pm

Re: Matlab Assignment 8

My plots for the matlab homework
Right Hand Side:
0
-19.62
2.5
5
-19.62
0
0
0
0
0

Coefficient Matrix:
2.000 0.000 0.000 0.000 0.000 0.000 1.000 0.000 1.000 0.000
0.000 2.000 0.000 0.000 0.000 0.000 0.000 1.000 0.000 1.000
0.000 0.000 0.167 0.000 0.000 0.000 0.000 -1.000 0.000 1.000
0.000 0.000 0.000 2.000 0.000 0.000 0.000 0.000 -1.000 0.000
0.000 0.000 0.000 0.000 2.000 0.000 0.000 0.000 0.000 -1.000
0.000 0.000 0.000 0.000 0.000 0.167 0.000 0.000 0.000 1.000
1.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
0.000 1.000 -1.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
1.000 0.000 0.000 -1.000 0.000 0.000 0.000 0.000 0.000 0.000
0.000 1.000 1.000 0.000 -1.000 1.000 0.000 0.000 0.000 0.000
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F11Carrie

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Unread post Mon Nov 28, 2011 5:24 pm

Re: Matlab Assignment 8

Coefficient matrix and Right Hand Side
Attachments
Coefficents_RHS.jpg
Coefficents_RHS.jpg (49.36 KiB) Viewed 7286 times
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F11Graham

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Unread post Mon Nov 28, 2011 5:27 pm

Re: Matlab Assignment 8

Here are my answers:
Attachments
CoefMatHW8.PNG
coefficient matrix
CoefMatHW8.PNG (10.37 KiB) Viewed 7286 times
RHSHW8.PNG
right hand side
RHSHW8.PNG (2.53 KiB) Viewed 7286 times
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F11Carrie

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Unread post Mon Nov 28, 2011 5:35 pm

Re: Matlab Assignment 8

Quick note: I noticed that half of us have one answer for J' and the other half have another answer. I'm guessing the discrepancy is that the formula for calculating J' in Table 6.1.1 shows the length of the rod to be l1 with the distance from the origin to the end of the rod being l1/2 on each side. The figure for this problem has each half-length of the pendulum links being either l1 or l2, so body 1 has a total length of 2*l1.
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F11Ryan

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Unread post Mon Nov 28, 2011 6:00 pm

Re: Matlab Assignment 8

RHS and Coefficient Matrix
Attachments
p3.JPG
p3.JPG (37.98 KiB) Viewed 7285 times
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F11Wendy

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Unread post Mon Nov 28, 2011 10:04 pm

Re: Matlab Assignment 8

Good call Carrie on each segment length being 2L
Here's my corrected matrices:

eq.jpg
eq.jpg (49.61 KiB) Viewed 7276 times
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F11Kwang

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Unread post Tue Nov 29, 2011 1:06 am

Re: Matlab Assignment 8

Kwang Won Choi's result
Attachments
answer_for_problem3_F.jpg
answer_for_problem3_F.jpg (16.39 KiB) Viewed 7268 times
answer_for_problem3_E.jpg
answer_for_problem3_E.jpg (54.62 KiB) Viewed 7268 times
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F11Christopher

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Unread post Tue Nov 29, 2011 3:48 am

Re: Matlab Assignment 8

Coefficient Matrix and RHS for Problem 3 e and f.
Attachments
Coefficient Matric and RHS.PNG
Coefficient Matric and RHS.PNG (18.27 KiB) Viewed 7266 times
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F11Brian

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Unread post Tue Nov 29, 2011 6:55 pm

Re: Matlab Assignment 8

LeftMatrix =

Columns 1 through 7

2.0000 0 0 0 0 0 1.0000
0 2.0000 0 0 0 0 0
0 0 0.6667 0 0 0 0
0 0 0 2.0000 0 0 0
0 0 0 0 2.0000 0 0
0 0 0 0 0 0.6667 0
1.0000 0 0 0 0 0 0
0 1.0000 -1.0000 0 0 0 0
1.0000 0 0 -1.0000 0 0 0
0 1.0000 1.0000 0 -1.0000 1.0000 0

Columns 8 through 10

0 1.0000 0
1.0000 0 1.0000
-1.0000 0 1.0000
0 -1.0000 0
0 0 -1.0000
0 0 1.0000
0 0 0
0 0 0
0 0 0
0 0 0


RightMatrix =

0
-19.6200
2.5000
5.0000
-19.6200
0
0
0
0
0
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F11Gratz

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Unread post Tue Nov 29, 2011 8:47 pm

Re: Matlab Assignment 8

Matlab 8 SC.PNG
Matlab 8 SC.PNG (9.65 KiB) Viewed 7239 times
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F11Rebecca

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Unread post Tue Nov 29, 2011 9:00 pm

Re: Matlab Assignment 8

Here are my coefficient and right-hand-side matrices:
CoefMatrix.png
CoefMatrix.png (36.32 KiB) Viewed 7237 times
RHS.png
RHS.png (13.37 KiB) Viewed 7237 times
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