NewVibTester
Bioengineer
Hi there,
I am new to vibration testing. I want to test the resonance of a small lightweight object. I have a Controlled Vibration platform shaker:
And a laser doppler vibrometer to measure the velocity on the platform. I am using Audacity to create a 'chirp' signal to play through the shaker. The limits of the platform are 5 Hz- 2000 Hz. I do not know the resonance frequency of my test objects so I was going to sweep through that range.
Can anyone point me towards resources telling me EXACTLY how to do a sinuoidal test sweep please, in enough detail for someone who is new to the area? At the moment I am concerned about exceeding the limits of the shaker platform and causing damage, given the varying amplitudes at particular frequencies. The material I have read indicates that I need to input a signal with a 'ramp up' below the crossover frequency then with a plateau above that, but I am unsure how exactly to calculate this. Then once I have sorted the signal, I presume I am then just measuring on the object and looking at the waveform to see higher amplitudes- but how can I account for the varied amplitudes of the input signal?
The test does not have to be absolutely perfect but I would like to find the resonant frequencies of the object.
Any help or pointers to useful information would be greatly appreciated.
I am new to vibration testing. I want to test the resonance of a small lightweight object. I have a Controlled Vibration platform shaker:
And a laser doppler vibrometer to measure the velocity on the platform. I am using Audacity to create a 'chirp' signal to play through the shaker. The limits of the platform are 5 Hz- 2000 Hz. I do not know the resonance frequency of my test objects so I was going to sweep through that range.
Can anyone point me towards resources telling me EXACTLY how to do a sinuoidal test sweep please, in enough detail for someone who is new to the area? At the moment I am concerned about exceeding the limits of the shaker platform and causing damage, given the varying amplitudes at particular frequencies. The material I have read indicates that I need to input a signal with a 'ramp up' below the crossover frequency then with a plateau above that, but I am unsure how exactly to calculate this. Then once I have sorted the signal, I presume I am then just measuring on the object and looking at the waveform to see higher amplitudes- but how can I account for the varied amplitudes of the input signal?
The test does not have to be absolutely perfect but I would like to find the resonant frequencies of the object.
Any help or pointers to useful information would be greatly appreciated.
