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ME 392 Chapter 8 Modal Analysis & Some Other Stuff April 2, 2012 week 12

ME 392 Chapter 8 Modal Analysis & Some Other Stuff April 2, 2012 week 12. Joseph Vignola. Assignments . I would like to offer to everyone the extra help you might need to catch up. Assignment 5 was due March 28 Lab 3 is due April 6 Lab 4 is due April 20 (this Friday)

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ME 392 Chapter 8 Modal Analysis & Some Other Stuff April 2, 2012 week 12

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  1. ME 392Chapter 8Modal Analysis& Some Other StuffApril 2, 2012week 12 Joseph Vignola

  2. Assignments I would like to offer to everyone the extra help you might need to catch up. Assignment 5 was due March 28 Lab 3 is due April 6 Lab 4 is due April 20 (this Friday) Assignment 6 was due April 27

  3. Use Templates Please make and use templates in Word for the assignments and lab reports You can make a template out of lab 1

  4. Assignments I have gotten several write-ups that don’t include plots or results I sent out an example for assignment 5 Please make sure you include Matlab plots and results Please find the slopes and the linear limit of the shaker

  5. Calendar for the Rest of the Semester We are running out of time April May

  6. Calendar for the Rest of the Semester We are running out of time April May Please keep the lab clear particularly for Odyssey Day

  7. Calendar for the Rest of the Semester We are running out of time April May Please keep the lab clear particularly for Odyssey Day Then we have Easter break

  8. Calendar for the Rest of the Semester We are running out of time April May Please keep the lab clear particularly for Odyssey Day Then we have Easter break Then I am out of town for a few days

  9. Calendar for the Rest of the Semester We are running out of time April May Please keep the lab clear particularly for Odyssey Day Then we have Easter break Then I am out of town for a few days Senior Design Day Then finals week

  10. Calendar for the Rest of the Semester We are running out of time April May hard due date You must have turned in by these dates so that I have time to grade them

  11. Citations Please use proper citations

  12. Citations Please use proper citations [1] J. F. Vignola, et al., Shaping of a system's frequency response using an array of subordinate oscillators, J. Acoust. Soc. Am., vol. 126, pp. 129-139, 2009.

  13. Citations Please use proper citations I don’t care what format you use, just pick one and be consistent [1] J. F. Vignola, et al., Shaping of a system's frequency response using an array of subordinate oscillators, J. Acoust. Soc. Am., vol. 126, pp. 129-139, 2009.

  14. Citations Please use proper citations I don’t care what format you use, just pick one and be consistent It is NOT ok to copy text from a source and follow it with a citation

  15. Citations Please use proper citations I don’t care what format you use, just pick one and be consistent It is NOT ok to copy text from a source and follow it with a citation Never use anyone else’s text without quotes

  16. Citations Please use proper citations I don’t care what format you use, just pick one and be consistent It is NOT ok to copy text from a source and follow it with a citation Never use anyone else’s text without quotes And, oh, by the way, don’t quote

  17. Citations Please use proper citations All figure taken from outside must have a citation

  18. Citations Please use proper citations All figure taken from outside must have a citation [1] J. F. Vignola, et al., Shaping of a system's frequency response using an array of subordinate oscillators, J. Acoust. Soc. Am., vol. 126, pp. 129-139, 2009. Taken from Vignola [1] 2009

  19. Citations Please use proper citations All figure taken from outside must have a citation [1] J. F. Vignola, et al., Shaping of a system's frequency response using an array of subordinate oscillators, J. Acoust. Soc. Am., vol. 126, pp. 129-139, 2009. … and the figure must have a taken from label Taken from Vignola [1] 2009

  20. Plagiarism Please write your lab reports on your own

  21. Plagiarism Please write your lab reports on your own I will help you and you can also ask the TAs for help

  22. Plagiarism Please write your lab reports on your own I will help you and you can also ask the TAs for help Don’t paraphrase someone else’s work

  23. Plagiarism Please write your lab reports on your own I will help you and you can also ask the TAs for help Don’t paraphrase someone else’s work… …not from someone in this class or anyone who took the class sometime in the past or anyone.

  24. Plagiarism Please write your lab reports on your own I will help you and you can also ask the TAs for help Don’t paraphrase someone else’s work… …not from someone in this class or anyone who took the class sometime in the past or anyone. The University of Wisconsin has an excellent web page that discuss plagiarism in detail http://students.wisc.edu/saja/misconduct/UWS14.html

  25. Plagiarism Please write your lab reports on your own I will help you and you can also ask the TAs for help Don’t paraphrase someone else’s work… …not from someone in this class or anyone who took the class sometime in the past or anyone. The University of Wisconsin has an excellent web page that discuss plagiarism in detail http://students.wisc.edu/saja/misconduct/UWS14.html What constitutes plagiarism does not change from instructor to instructor

  26. Block Diagrams Please don’t include the LabView block diagram in your lab reports

  27. Block Diagrams Please don’t include the LabView block diagram in your lab reports Taken from Vignola 1991

  28. Block Diagrams Please don’t include the LabView block diagram in your lab reports yes Taken from Vignola 1991

  29. Block Diagrams Please don’t include the LabView block diagram in your lab reports yes Taken from Vignola 1991 Taken from Vignola 2011

  30. Block Diagrams Please don’t include the LabView block diagram in your lab reports yes no Taken from Vignola 1991 Taken from Vignola 2011

  31. Matlab Code Matlab code NEVER belongs in the body of a lab report Put it in the appendix if you think it is really necessary Don’t include L = .7; x = L*[0:.005:1]; h = .003; [f,t] = freqtime(.0004,1024); n=1:15; k = pi*n'/L; An = (-4*h./((pi*n).^2)); a = 1/7; Bn = (2*h./((pi*n).^2))*(1/(a*(1-a))).*sin(a*n*pi); c = 100; omega = n*pi*c/L;

  32. Equations Please use the equation editor in MS Word for all equations It is easy to use but if you don’t know how to use it please let me help you learn it

  33. Equations Please use the equation editor in MS Word for all equations It is easy to use but if you don’t know how to use it please let me help you learn it yes

  34. Equations Please use the equation editor in MS Word for all equations It is easy to use but if you don’t know how to use it please let me help you learn it yes no Bn = (2*h./((pi*n).^2))*(1/(a*(1-a))).*sin(a*n*pi);

  35. Single Degree of Freedom Oscillator Last week we looked at the single degree of freedom k b m x(t)

  36. Single Degree of Freedom Oscillator Last week we looked at the single degree of freedom k b m x(t) And can predict its behavior in either time

  37. Single Degree of Freedom Oscillator Last week we looked at the single degree of freedom k b m x(t) And can predict its behavior in either time or frequency domain

  38. Multi Degree of Freedom Oscillators …what I didn’t tell you last week was that real structures have more that one resonance Every one of these resonance has a particular frequency And a specific shape that describes the way it deforms.

  39. Multi Degree of Freedom Oscillators …what I didn’t tell you last week was that real structures have more that one resonance k1 b1 Every one of these resonance has a particular frequency And a specific shape that describes the way it deforms. We can model a structure as a collection masses – springs and dampers m1 x1(t) k2 b2 m2 x2(t) k3 b3 x3(t) m3 F(t)

  40. Two Degree of Freedom Oscillator As an example consider two mass constrained to only move side to side Taken from Judge, ME 392 Notes

  41. Two Degree of Freedom Oscillator As an example consider two mass constrained to only move side to side One mode has the two masses moving together Taken from Judge, ME 392 Notes

  42. Two Degree of Freedom Oscillator As an example consider two mass constrained to only move side to side One mode has the two masses moving together The other mode has the masses moving in opposition Taken from Judge, ME 392 Notes

  43. Clamped String Strings like those on musical instruments respond are discreet frequencies A mode can only be excited at one frequency

  44. Clamped String Strings like those on musical instruments respond are discreet frequencies A mode can only be excited at one frequency For the guitar string the mode frequencies are integer multiplies of the lowest (the fundamental) The mode shapes are simple sine functions

  45. Clamped String Strings like those on musical instruments respond are discreet frequencies The response to any excitation can only be composed of those modes

  46. Clamped String Strings like those on musical instruments respond are discreet frequencies The response to any excitation can only be composed of those modes So if I pull the string at sum location, say the middle and let it go

  47. Clamped String Strings like those on musical instruments respond are discreet frequencies The response to any excitation can only be composed of those modes So if I pull the string at sum location, say the middle and let it go… You can predict the displacement field by adding up a modes

  48. Clamped String Strings like those on musical instruments respond are discreet frequencies The response to any excitation can only be composed of those modes So if I pull the string at sum location, say the middle and let it go… You can predict the displacement field by adding up a modes

  49. Clamped String Strings like those on musical instruments respond are discreet frequencies The response to any excitation can only be composed of those modes So if I pull the string at sum location, say the middle and let it go… You can predict the displacement field by adding up a modes

  50. Clamped String Strings like those on musical instruments respond are discreet frequencies The response to any excitation can only be composed of those modes So if I pull the string at sum location, say the middle and let it go… You can predict the displacement field by adding up a modes

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