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[answered] MAE 215: Introduction to Programming in MATLAB Course Proje


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bellow are links for data that will help answering problem 2!

https://myasucourses.asu.edu/bbcswebdav/pid-14193571-dt-content-rid-81756266_1/courses/2016Fall-T-MAE215-78245/2_MIL_Test.txt

https://myasucourses.asu.edu/bbcswebdav/pid-14193571-dt-content-rid-81756268_1/courses/2016Fall-T-MAE215-78245/5Mil_Test.txt

https://myasucourses.asu.edu/bbcswebdav/pid-14193571-dt-content-rid-81756270_1/courses/2016Fall-T-MAE215-78245/Aluminum_Test.txt



MAE 215: Introduction to Programming in MATLAB

 

Course Project

 

Due: Wednesday, November 30th by midnight Submission Instructions: Your solutions to this assignment must be typed and neatly presented. Unorganized solutions and/or solutions that do not present the required

 

deliverables will not be graded and receive a score of zero. This assignment is to be

 

submitted, in PDF format, to the assignment link on blackboard by the deadline.

 

Students who obtain a score of 80% or greater on this project will receive credit for all course

 

outcomes. 1. [45 pts] Part 1 ? ?For? and ?While? loops in MATLAB

 

i.

 

Consider the approximation for sin(x) given in homework #3 as: 3 5 7 9 11 13 15 17 = ? + ? + ?

 

+

 

?

 

+

 

3! 5! 7! 9! 11! 13! 15! 17!

 

Create a vector where each element is a term of the series. Allow the user to input the value

 

of x (as a scalar). Sum the terms of the series using a ?for? loop and create a formatted output

 

to show the user (1) the value of the approximation, (2) the actual value of sin(x) (from the

 

MATLAB function) and (3) the error between the two. Use values x = 2, 2.5, 3 to compare.

 

ii. Now consider the generalized form of the Taylor series for sin(x):

 

? 2+1

 

sin = ?(?1)

 

(2 + 1)! =0 Sum the first 100 terms of the series and show the result as a formatted output identical to

 

that of 1(i). Allow the user to input the value of x as a scalar. Repeat this problem with the

 

first 250 terms. Compare the results. (Use same x values as from (i)).

 

iii. How many terms are required in (iii) to reduce the relative error to less than 1%?

 

0.00001%?

 

Assume that the relative error (percent) is defined as:

 

( ? ) % = | = sin , | ? 100 = ??

 

=0(?1) ( 2+1

 

2+1)! where St and Sn are the true and numerical solutions, respectively. The ?numerical? solution

 

will come from the summation of terms while the true solution can be obtained using the

 

built-in MATLAB function for sin(x). Each iteration through the loop, create a formatted

 

output that shows (1) the iteration number, (2) the number of terms in the series and (3) the MAE 215: Introduction to Programming in MATLAB

 

Course Project

 

Due: Wednesday, November 30th by midnight

 

percent error between the obtained values. The output printed during the loop should be

 

done so that a new line is created each time a new output is printed. When the loop has

 

completed, display the result, the final percent error, and the number of terms using a single

 

command. Save the percent error per iteration and plot % error vs. iteration when the loop

 

has completed.

 

iv. For (iii), create a flowchart showing the logic of your code. Considering that this is the course

 

project, please be sure to create this flowchart in a word editor (i.e. it must be typed!). 2. [55 pts] Part 2 ? Processing data with MATLAB

 

i.

 

Consider the 3 text files labeled ?aluminum_test?, ?5_MIL_test? and ?2_MIL_test? that are

 

uploaded and attached to the assignment link. This data was collected when running

 

Arizona State University?s shocktube during an AEE 362 (High Speed Aerodynamics)

 

laboratory experiment . The tests show data for 3 different shock wave experiments where

 

shocks of different strengths were intentionally generated. Note that the first two columns

 

represent pressure data (reported in psi) and that columns 3 and 4 show pressure data in

 

units of Volts. Therefore, the data in columns 3 and 4 must be converted to useful units

 

before it can be plotted. The conversion is given below, giving you a result in PSI. = 0.0418 ? Your task is to:

 

a. Load this data into MATLAB (hint: load() ? you may also need to remove the text at the top of

 

the data file).

 

b. Find the total time of the dataset, noting that the time between data points is 0.025 ms.

 

c. Add 14.0 to all the values in the second column. Plot this data together with that of the first

 

column vs. time. Knowing that this is pressure, what appears to be happening?

 

d. Plot the data in columns 3 and 4 vs. time, after this data has been converted to PSI. These

 

sensors were mounted inside the tube and represent changes in pressure over time. What

 

can you see from the data? (quick comment)

 

1

 

e. The distance between the two pressure transducers is given as 4832 in. Knowing this, we can

 

use the ?peaks? from the data in the plot from (d) (showing two changes in pressure at two

 

different locations) to calculate the speed of the resulting shockwave. After generating the

 

plot, use the ?cursor tool? and find the between the two peaks (you may also need to zoomin considering it is the first two peaks we are interested in). The velocity of the wave can then

 

be calculated using: ?x

 

?t where is the distance between pressure sensors. Compare shock speeds between the

 

materials (no comments/analysis needed ? but look at the results!).

 

The material strengths are in the order: 5 Mil, 2Mil, Aluminum.

 


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