E-A-R -- noise control, vibration damping, sound insulation, shock cushioning

Noise Control Solutions for Network Base Station

To support the tremendous growth of wireless devices today, cellular telecommunication base stations increasingly are located in populated areas, where residents likely will raise objections to the equipment noise. Additionally, more and more of these devices must now meet Network Equipment Building System (NEBS) standards. Here are some of the ways E-A-R can help quiet large-scale, fan-cooled electronics.

(A) Fan Bank

Many cooling fans are needed to maintain an acceptable operating temperature in a base station. When fastened to metal frames and cases, however, the fans cause surrounding structures to vibrate and generate noise. Using specially designed ISODAMP® fan mounts isolates the fans from the frame and damps and dissipates the vibrations. E-A-R highly damped fan mounts are engineered for secure, tool-less installation.

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(B) Exhaust Muffler Assembly

A muffler system employing E-A-R’s TUFCOTE® acoustical absorption foam significantly reduces objectionable noise created by the numerous cooling fans required by base station electronic equipment. The flow of exhaust air must travel through a sheet-metal box containing a series of baffles covered with TUFCOTE H-100SM/PSA foam, a one-inch absorbing foam faced with aluminized polyester and backed with a pressure-sensitive adhesive. The baffles form what is called a tortuous path for sound waves, which dissipates acoustic energy and reduces noise levels without excessively restricting airflow.

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When they enclose and support electromechanical equipment, light and rigid metal panels can broadcast the resulting structural vibrations as airborne noise. This energy is easily controlled, however, by applying ISODAMP C-2206-03PSA damping sheets—.03-inch highly damped vinyl with pressure-sensitive adhesive backing, for easy installation.

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