Structuralborne

Structuralborne refers to sound or vibration that travels through solid materials rather than through the air. This type of transmission is distinct from airborne sound, which propagates through the air as pressure waves. Structuralborne sound originates from a source, such as machinery, footsteps, or impact, and then causes the structure itself to vibrate. These vibrations then radiate sound into the surrounding environment.

The characteristics of structuralborne sound depend heavily on the properties of the material through which it travels. Denser and more rigid materials tend to transmit vibrations more effectively. Examples include concrete, steel, and wood. The frequency of the vibration also plays a role; lower frequencies often travel further and with greater intensity through structures.

Common sources of structuralborne sound include building services like HVAC systems, pumps, and elevators, as well as everyday activities like walking, closing doors, or dropping objects. In industrial settings, heavy machinery is a significant contributor. The impact of vibrations can lead to noise annoyance, reduced comfort, and in some cases, structural fatigue or damage over time.

Mitigation strategies for structuralborne sound focus on interrupting the vibration path. This can involve using isolation mounts, damping materials, or flexible connections between the vibrating source and the structure. Decoupling different structural elements is also a common technique. Understanding the principles of structuralborne sound is crucial in areas like acoustics, building design, and industrial noise control to ensure comfortable and functional environments.