Mechanical resonance Mechanical resonance Mechanical resonance is the tendency of a mechanical system to respond at greater amplitude when the frequency of its oscillations matches the system's natural frequency of vibration (its "resonance frequency" or "resonant frequency") than it does at other frequencies. It may cause violent swaying motions and even catastrophic failure in improperly constructed structures including bridges, buildings and airplanes. This is a phenomenon known as resonance disaster. Avoiding resonance disasters is a major concern in every building, tower and bridge construction project. The Taipei 101 building relies on a 660-ton pendulum—a tuned mass damper—to modify the response at resonance.
Amplitude panning sound image. However, it was suggested that the localisation at relatively high frequencies may take advantage of the interaural level difference resulting from the head-shadowing effect. For the frontal standard configuration, the relation between the inter-channel level difference and the perceived image position has been investigated in many studies, where the target positions were found to be slightly overestimated in many cases. Similar listening tests were also carried out for some asymmetrical lateral configurations, and the results showed that the amplitude-panning method is not as efficient in presenting images to listener’s side as it is to the front. Amplitude panning