The disadvantage of analyzing a signal using a fixed frequency at the model is noticeable even more when analyzing high order harmonic content, because the error of the fundamental frequency
is multiplied so automated analysis is now possible under these uncertain conditions.
Half fundamental frequency
problem (magnitudes of ECG harmonics were chosen arbitrarily to show the location of the harmonics and do not reflect the actual values of the signal).
The first term is the amplitude modulation (AM) value; the second term is the total energy, used to normalize the value of AM; the third term is the frequency modulation (FM) value; the fourth term is the square of the fundamental frequency
, used to normalize the value of FM; the fifth is the normalization factor of the time-domain integration interval.
To test the relationship between different pre-stress values and the fundamental frequency
of beams through experiments, this paper adopted jack to tension pre-stress tendons and used an oil pressure gauge to control the tensioning force to obtain the required pre-stress value.
At 150 rad/s case, the amplitude of the fundamental frequency
of the system with the SFD mounted on the faulted bearing does not change much comparing with that without the SFD.
a maximum fundamental frequency
of 6.21 is given by 4 lane box girder at 20 m then it gradually decreases, also a minimum fundamental frequency
of 0.731 is given by 2, 4 lane I girder at 60m.
One path provides anti-aliasing and determines the fundamental frequency
, and the other accounts for all the signal information.
Voice spectrum in voice analysis consists of a series of sine waves and lowest of these harmonics (First harmonic) is known as fundamental frequency
As shown in Figure 8, there is the main peak of [St.sub.f] = 1.56 (fundamental frequency
) in both predicted and measured results, where the cavity tone radiates at this frequency.
At the fundamental frequency
, the amplitudes of inner rotor's loose node in X-direction and Y-direction are greater than the amplitudes under normal condition; the amplitudes of node located in the bearing that supported the outer rotor basically remain the same.
Mathematical definitions of all these are given in table considering f1 is the fundamental frequency