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Announcements

Announcements. Next Tuesday (March 12 th ). Department meeting. Ms. Liron’s office hours start at 2:15pm TAKE NOTES! fill in the blanks!. Exam2 – Coding Review. Topics. Library functions: ceil() , floor() , round() , mod() Loops while for Arrays Create: [] , rand ()

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Announcements

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  1. Announcements • Next Tuesday (March 12th). Department meeting. • Ms. Liron’s office hours start at 2:15pm • TAKE NOTES! fill in the blanks!

  2. Exam2 – Coding Review

  3. Topics • Library functions: ceil(), floor(), round(), mod() • Loops • while • for • Arrays • Create: [], rand() • Analyze: sum(), prod(), min(), max(), mean() • Dimensioning: length(), size(), numel() • Slicing/referencing: vector(k), matrix(r,c), array(_:_) • Concatenating: [] • Traversing: for k = 1:____ • Deleting: =[]; • Plotting basics • plot(x,y) %plots y vs. x graph

  4. Example - A wind tunnel • AE 315 Experimental Aerodynamics Lab Source: http://wings.avkids.com/Tennis/Images/ten_wt.jpg

  5. Wind Tunnels • Soruce: http://www.aerolab.com/Display_Pages/EWT.html

  6. What can you put in the test section? • The photograph shows a stainless steel model of a Mk I which was used in 1941 for wind tunnel investigations into high speed dive characteristics. • NASA wind tunnel Source: http://wpcontent.answers.com/wikipedia/commons/thumb/0/04/Windkanal.jpg/350px-Windkanal.jpg

  7. Models (2) • Helios wind tunnel model Source: http://www.speedace.info/solar_cars/aristotle_university_of_thessaloniki_helios.htm • Formula1 cars Source: http://www.lucamazzocco.com/images_all.asp?CategoryID=42

  8. Models (3/3) • This is the motivation for the realization of an extensive wind tunnel model of the city part "Kleinbasel" at the scale 1:300. The model covers an area of a bit less than 3 km² of urban roughness densely covered by over 3 200 houses as it is typical for Basel and other european urban environments of comparable size. Source: http://pages.unibas.ch/geo/mcr/Projects/BUBBLE/textpages/md_windtunnel.en.htm

  9. Random question… • What happens to the water in a tube?

  10. Models linked to the outside Source: http://technicalteachingequipment.com/images/Aerodynamics%20lab/wind%20tunnel%20panel%20board%20with%20manometer.JPG

  11. What you link to the models A multi-tube manometer Source: http://technicalteachingequipment.com/images/Aerodynamics%20lab/wind%20tunnel%20panel%20board%20with%20manometer.JPG

  12. Some visual results… Source: http://www.aerolab.com/Display_Pages/EWT.html Source: http://www.cussons.co.uk/en/products/p3202.html Source: http://www.sewon-eng.co.kr/Brand_img/185_A.jpg

  13. Velocity Distribution • Velocity is linked to the pressure in the tube • Where is the total pressure (in inches of water) • Where is the static pressure (in inches of water). That is the reference point of the tube, when the wind tunnel is off. • is the absolute air temperature in Rankine(not Celsius, not Fahrenheit).

  14. Requirements – Method 1 • Assume the static pressure is 32 inches, and the temperature is 78F (537Rankine) • Let the user indicate how many pitot tubes were recorded. Trap when invalid. It should be above 5. • Loop to generate the table of data. Store all data in one array, as values are calculated. • Total pressure: prompt user number between 30 and 32 inches. • (Assume valid inputs given at this time) • Calculate velocity associated each time • Display the table, with headers. • Plot the local velocities vs. the pitot tube number • Calculate the min, max, and average velocity.

  15. Example • These are just guidelines

  16. Brainstorm • Keywords? • Algorithm ideas?

  17. Algorithm clc clear … develop your algorithm please!

  18. Code– part1 clc clear %set up constant data %prompt user for nb of tubes _______________________________ while_______________________________ _______________________________ end %loop for each tube for _______________________________ %store tube number in column 1 _______________________________ %generate water height (32-35), store in column2 _______________________________ %calculate velocity, store in column3 _______________________________ end

  19. continued… %display header ___________________________________________________________________________________ %display table ___________________________________________________________________________________ %plot velocity vs. tube number ____________________________________________________ ____________________________________________________ ____________________________________________________ %find min, max, average ____________________________________________________ ____________________________________________________ ____________________________________________________

  20. Requirements – Method 2 • Assume the static pressure is 32 inches, and the temperature is 78F (537Rankine) • Let the user indicate how many pitot tubes were recorded. Trap when invalid. It should be above 5. • Without a loop, create the table. • Total pressure: Generate random floats between 30 and 32 inches. • Display the table with headers. • Plot the local velocities vs. the pitot tube number • Calculate the min, max, and average velocity.

  21. Algorithm/Code clc clear %set up constant data %prompt user for nb of tubes while end % create column of tube number % generate column of water height (32-35) % calculate velocity % combine all columns into 1 table %display header %display table %plot velocity vs. tube number %find min, max, average

  22. STUDY HARD! • Practice tonight. • Take the notes you just took, and code the example! • The more practice, the easier it gets!

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