The Resonance

In physics, resonance is the tendency of a system to oscillate at maximum amplitude at certain frequencies, known as the system's resonance frequencies (or resonant frequencies). At these frequencies, even small periodic driving forces can produce large amplitude vibrations, because the system stores vibrational energy. When damping is small, the resonance frequency is approximately equal to the natural frequency of the system, which is the frequency of free vibrations.
Resonant phenomena occur with all types of vibrations or waves: there is mechanical resonance, acoustic resonance, electromagnetic resonance, and resonance of quantum wave functions. Resonant systems can be used to generate vibrations of a specific frequency, or pick out specific frequencies from a complex vibration containing many frequencies.

In this chapter will be shown the resonance of the motor mount structure. The motor type is VSD motor, and will be operated at 60%,70%,80%,90%and 100% maximum at 345rpm.

The result shown that the resonance occur at 50% and 90% of the motor operation. This resonance is occur between motor and structure it self. So the final conclusion is operatio on those phase (50% and %90) is not recomended to avoid resonance between motor and structure.