#TUNING FORK VIBRATION MECHANICS FREE#

The fundamental vibration mode of a tuning fork radiates sound as a longitudinal (or linear) quadrupole sound source with a well-defined transition between the near-field and far-field radiated patterns. The tuning fork forces surrounding glass (or vinyl) particles into vibrational motion. But, it can be effectively demonstrated by touching the stem of a vibrating fork to a table top, door, or piano soundboard. This stem motion is very small, and difficult to feel if you place a finger tip at the bottom of the stem. It is shown theoretically and confirmed experimentally that longitudinal oscillations can occur at fork frequency and twice fork frequency, and that the. However, the stem actually vibrates up and down at the fundamental frequency as well as at the second harmonic, 852 Hz - twice the frequency of the fundamental (even there is no vibrational mode of the fork at this frequency). When vibrating in the fundamental mode, it would appear that the stem of the fork is stationary. This is a symmetric mode, since the two tines are mirror images of each other.Ī video on my YouTube Channel shows the slow-motion oscillation (shot with a high speed camera at 1200fps) of a 125 Hz tuning fork vibrating in its fundamental mode of vibration.

#TUNING FORK VIBRATION MECHANICS FREE#

The two tines of the fork alternately move toward and away from each other, each bending like a cantilever beam, fixed at the stem and free at the other end. When the fork comes in contact with material, the vibration is.

The vibration mechanism is simple, so it produces a sound with a single frequency well. The TFLS incorporates a piezoelectric crystal that vibrates the fork at its natural frequency. When the tuning fork is vibrated, the tuning fork repeatedly approaches and then moves away from each other. The fundamental mode of vibration is the mode most commonly associated with tuning forks it is the mode shape whose frequency is printed on the fork, which in this case is 426 Hz. Basic motion of air molecules Tuning fork The tuning fork has a structure that combines the ends of two sticks.

Tuning fork vibration mechanics