Measuring reference signal of magnetic excitation (a solenoid)
Measuring reference signal of magnetic excitation (a solenoid)
(OP)
Hello all,
I am now preparing an experiment based on the ASTM E756 damping test to study the properties of some VEM bought. In the test non-contact exciter is used to excite a sandwiched beam. I used a solenoid and is able to excite the beam with both sinusoidal and random signals. But now I am having trouble to measure the reference signal of the solenoid, which is used to create a frequency response function. What quantity should I measure, current, magnetic field or other? What device(s) should be used?
I tried to use a speaker (with a microphone to measure the reference signal) to excite the beam. But I was not able to excite high frequency modes (>1000 Hz).
Thanks.
Ricky
I am now preparing an experiment based on the ASTM E756 damping test to study the properties of some VEM bought. In the test non-contact exciter is used to excite a sandwiched beam. I used a solenoid and is able to excite the beam with both sinusoidal and random signals. But now I am having trouble to measure the reference signal of the solenoid, which is used to create a frequency response function. What quantity should I measure, current, magnetic field or other? What device(s) should be used?
I tried to use a speaker (with a microphone to measure the reference signal) to excite the beam. But I was not able to excite high frequency modes (>1000 Hz).
Thanks.
Ricky





RE: Measuring reference signal of magnetic excitation (a solenoid)
M
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Dr Michael F Platten
RE: Measuring reference signal of magnetic excitation (a solenoid)
Then measure the response of the beam with an accelerometer.
Damping can then be calculated from the resulting signals either in the time domain or the the frequency domain.
Tom Irvine
www.vibrationdata.com