Acoustical Engineering

Explore how the ear processes sound from the outer ear to the cochlea, the 20 to 20,000 Hz hearing range, and how building ambient noise is assessed.

Explore how sound travels through absorption, attenuation, and the four wave phenomena—diffraction, reflection, interference, and refraction—along with practical examples like noise control and echo issues.

Explains standing waves, interference, and harmonics in strings, with boundary conditions determining modes and timbre. Classifies sound sources as point, line, and deployed sources, using directivity and activity concepts.

Explore how atmospheric refraction bends sound due to temperature gradients and wind, and evaluate noise barriers and the Doppler effect, including practical implications for barriers and radar.

Explore how sound absorption converts energy to heat, differing from insulation, and learn about absorption coefficient alpha and sound reduction index R across frequencies in practical materials.

Explore room acoustics by analyzing reverberation time, Sabine's formula, and room constants to optimize speech intelligibility and acoustic privacy while avoiding problematic room modes and parallel walls.

Explore how sound transmits between rooms through partitions, including airborne, impact, and structural-borne insulation, and compute the sound reduction index and transmission coefficient across direct and flanking paths.

Explore how partition mass, stiffness, and damping affect vibration and sound transmission. Apply practical measures like increasing mass, creating cavity gaps, and sealing edges to improve insulation.

Explore how mass-spring-damper systems govern vibration, from natural frequency and damping to resonance and isolation. Relate displacement, velocity, and acceleration across phases.

Explore vibration isolation by using mass-spring systems to keep driving frequency well above resonance, reducing transmitted vibration and transmissibility through springs, damping, and inertial bases.

Demonstrates how to assess vibration exposure with accelerometers on power tools, discusses health risks such as Reynolds disease, and covers vibration exposure level measurement and variation in exposure.

Learn the basics of noise control, from noise generation at the source to transmission paths and receiver protection, using insulation, absorption, vibration isolation, and dumping.

Explore how machine noise is generated by rotating parts and forces, and apply practical control strategies such as reducing forces, minimizing transmission, and using damping, isolation, and shielding.

Analyze hvac noise control in acoustical engineering, focusing on air handling units, fans, ducts, silencers, and active or hybrid strategies to reduce broadband and tonal noise.

Discover key acoustical software used daily to model spaces, calculate reverberation time, assess sound transmission and insulation, generate noise maps, and evaluate barrier and material performance.

Explains how condenser microphones convert acoustic pressure into electrical signals via a diaphragm and capacitor, and covers sensitivity, dynamic range, and frequency response.