Learn about the 3 most common types of mechanical resonance phenomena in this article. Discover prevention methods and examples of each type.

3 Most Common Types of Mechanical Resonance Phenomena

Mechanical resonance is a phenomenon that occurs when a mechanical system is subjected to an external force that has the same frequency as the system’s natural frequency. This can cause the system to vibrate with a larger amplitude, which can lead to damage or failure of the system. In this article, we will discuss the three most common types of mechanical resonance phenomena.

1. Structural Resonance

Structural resonance occurs when a mechanical structure, such as a building or bridge, is subjected to an external force that has the same frequency as the structure’s natural frequency. This can cause the structure to vibrate with a larger amplitude, which can lead to structural damage or failure.

One example of structural resonance is the collapse of the Tacoma Narrows Bridge in 1940. The bridge was designed with a natural frequency that was too close to the frequency of the wind that was blowing that day, causing the bridge to vibrate violently and eventually collapse.

2. Rotational Resonance

Rotational resonance occurs when a rotating system, such as a motor or a fan, is subjected to an external force that has the same frequency as the system’s natural frequency. This can cause the system to vibrate with a larger amplitude, which can lead to mechanical failure or decreased efficiency.

One example of rotational resonance is the failure of a helicopter’s rotor system. If the rotor blades are not properly balanced or if the engine produces a vibration that matches the rotor system’s natural frequency, it can cause the blades to vibrate excessively and eventually fail.

3. Acoustic Resonance

Acoustic resonance occurs when a cavity or a duct, such as a musical instrument or a speaker, is subjected to an external sound wave that has the same frequency as the cavity or duct’s natural frequency. This can cause the cavity or duct to vibrate with a larger amplitude, which can lead to increased sound output or decreased efficiency.