Practical Solutions to Machinery and Maintenance Vibration Problems
Chapter 11, Gear Vibration
Section 2, Beat Originating from Only One Vibration Source
A beat can also be formed when vibration originates from only one source. This occasionally occurs when a vibration occurs at a frequency close to the resonant frequency of the responding part. The source vibration frequency gives an impulse to the responding member causing it to vibrate at its own natural frequency. As the source vibration frequency is so close to the natural frequency, another impulse is given on the next cycle, that is almost in phase with the natural frequency vibration. The responding part then actually vibrates at its natural frequency, but the source vibrates at its own frequency. The two vibrations add and subtract from each other, causing a beat. Detuning the resonant part will reduce the vibration and eliminate the beat.
This textbook contains only part of the information in our Practical Solutions seminar.