Homework 5 - Unied Engineering Fluids Problems F15F16...

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Unified Engineering Spring 2004 Fluids Problems F15–F16 F15. Our analysis for determining the speed of sound assumed that the sound wave had infinitesimal strength. But for the 120 dB sound waves produced by Linkin Park near the stage, this assumption may be suspect. a) One suitable definition of sound dB level is: p dB = 20 log 10 20 × 10 6 Pa where p is a pressure variation caused by an average passing sound wave. Treating this sound wave as a shock wave, determine its propagation Mach number into still air. Hint: Put the propagating-shock situation into the shock’s frame of reference. b) Determine the temperature fluctuations associated with the passing waves. Would you say Linkin Park makes strong or wimpy shock waves? F16. a) Anderson p. 502, Problem 15. b) For Problem 15, also calculate the stagnation pressure at the very tip of the SR-71 nose sting.
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Unified Engineering Spring 2004 Problem M14 A circular cross-section aluminum tube is simply supported at its ends and is loaded eccentrically as shown. The external diameter of the tube is 50 mm, the wall thickness is 5 mm. The Young’s modulus is 70 GPa, The allowable normal stress is 85 MPa. The length of the tube is 2.5 m.
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  • Fall '08
  • STREKOWSKI
  • Tensile strength, yield strength, sound wave, lower yield strength, damage tolerance requirements, yield strength metal

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