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.

Because the

fundamental frequency is 85 kHz, almost all harmonics appeared in the frequency bands under 10 MHz.

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 (F0).

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.