HW7 - Texas A&M University Department of Mechanical...

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Texas A&M University Department of Mechanical Engineering MEEN 260 Measurement and Instrumentation in Mechanical Engineering Fall 2010 Assignment #7 Due Mon, Nov 1, 2010 Problem 1: A 500-Hz sine wave is sampled at frequency of 4096 Hz. A total of 2048 points are taken. a. What is the Nyquist frequency? b. The student making the measurement suspects that the sampled waveform contains several harmonics of 500 Hz. Which of these can be accurately measured? What happens to the others? Problem 2: A 150-Hz cosine wave is sampled at a rate of 200 Hz. a. Draw the wave by hand and show the temporal locations at which it is measured. b. What apparent frequency is measured? c. Justify your answer with calculations. Problem 3: An engineer is studying the vibrational spectrum of a large diesel engine. Her model- ing estimates suggest that a strong resonance is likely at 250 Hz, and that weaker frequencies of up to 2000Hz may be excited also. She has placed an accelerometer on the machine to measure the vibration spectrum. She samples the accelerometer output voltage using her computer's analog-to-
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This note was uploaded on 01/03/2011 for the course MEEN 260 taught by Professor Langari during the Fall '08 term at Texas A&M.

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HW7 - Texas A&M University Department of Mechanical...

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