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Unformatted text preview: MA330 Fall 2006 Test 2 1 November 2006 Name and ID number: Instructions: No calculators, cell phones, or help from a friend. You are allowed 1-sheet of 8.5 x 11 paper with whatever handwritten stuff you desire. There is no integral sheet attached because you will not need to find any integrals. Where I have asked for justification, I am looking for a few short calculations and a few words, not a long derivation and paragraphs of writing. 2 1. A motor which nominally operates at 1800rpm is geared down to drive a hydraulic pump whose nominal speed is 720rpm. An unusual vibration is noted in the motor/pump assembly, and you are tasked to evaluate. You are given the results of a vibration monitoring measurement along with the baseline cut that was performed when the equipment was new. The power spectrum graphs below are the baseline (left) and the new measurement (right). 20 40 60 10 10 5 f (Hz) Power Baseline Vibration Test 20 40 60 10 10 5 f (Hz) Power Troubleshooting Vibration Test a b c d e The frequency peaks noted on the graph are at frequencies f a 12 , f b 24 , f c 30 , f d 36 , f e 48 . (a) The peak at f a should be associated with what part of the assembly? Justify your answer....
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