You need to run some vibrations tests and your lab has an ac

You need to run some vibrations tests and your lab has an accelerometer (2nd order system) that has a natural frequency (resonance) at 1,000 Hz and damping ratio of 0.1. The vibrations you wish to measure are in the range of 4,000 – 10,000 Hz.

a. What are the amplitude error (in %) and phase shift (in degrees) expected at the low end of the vibration frequency range (4,000 Hz)?

b. What is the maximum frequency that you can measure to have no more than 1% error in the amplitude of the reading?

c. Is this a suitable choice of accelerometer for this measurement? Why or why not?

Solution

The answer of the following questions are as follows

a) The amplitude error is 1.03% and phase shift is 65%

b)The maximum frequency is 46 hz.

c) No it is not suitable choice of accelerator for this measurement.