| 21. | Cars typically vibrate at a natural frequency of 15 to 25 Hz-- the higher the better.
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| 22. | The natural frequencies of a rolling element bearing with the free boundary conditions are 3 kHz.
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| 23. | Below the natural frequency, transmissibility hovers near 1.
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| 24. | Stepper motors have a natural frequency of operation.
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| 25. | Higher orders of parametric resonance are observed either at or at submultiples of the natural frequency.
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| 26. | Overtones occur when a system has more than one natural frequency ( as many systems do ).
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| 27. | Parametric resonance takes place when the external excitation frequency equals twice the natural frequency of the system.
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| 28. | It is also possible to test a physical object to determine its natural frequencies and mode shapes.
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| 29. | Where undamped natural frequency f _ 0 and Q factor are discussed above in the low-pass filter discussion.
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| 30. | Damping dissipates energy in the system, which reduces the vibration level which is transmitted at the natural frequency.
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