Afternoon Session: Laboratory activities to reinforce concepts learned, including: -Effects of dampening layer on plate, -Duct noise reduction with Helmholtz resonator
, -Quiet shaker for buzz, squeak and rattle noise testing -Rotating shaft information extraction, -Operating deflection shape; and, -Low frequency displacement measurement.
--The Helmholtz resonator
(or cavity resonator), consists of a cavity that is connected to the noisy space through a short neck.
The Generation III composite intake manifold, using Zytel(R) nylon for GM's line-up of full-size trucks, features an integrated Helmholtz resonator
, but paves the way for further integration -- including air-cleaner elements, throttle-body housings, fuel-rail elements, snap fits and twist locks.
It was the basis of a series of works of Sugimoto and coauthors [6,7], where the propagation of nonlinear acoustic waves was investigated in a tube connected with an array of Helmholtz resonators.
Two values of the resonators height are considered: H = 2 cm and H = 7 cm, modifying the resonance angular frequency of the Helmholtz resonators ([[omega].
Numerical modeling of nonlinear acoustic waves in a tube with Helmholtz resonators.
Generation of acoustic solitary waves in a lattice of Helmholtz resonators.
corporating new materials with Helmholtz resonators
built into an innovative hollow block and panel tri-layer composite sound wall, designed by himself and Aina Julian, Architect.
At short test sites in Italy and the Netherlands noise-absorbing Helmholtz resonators
are embedded in the concrete foundation, cutting several decibels more.
5 kHz using a network of fluid-filled Helmholtz resonators.
The transmission channels act as a series of inductors, and the Helmholtz resonators, which Fang describes as cavities that house resonating waves and oscillate at certain sonic frequencies almost as a musical instrument would, act as capacitors.