The Acoustic Division offers a complete line of acoustic products and services to help our customers solve the most demanding noise treatment problems. Allied International Corporation, specializing in noise treatment or acoustic attenuation, has been serving customers in the USA, Europe, and the Far East for over 50 years. Our proprietary metal fiber based acoustic media is particularly suited for high frequency noises associated with blade passing frequencies found in Environmental Control Systems (ECS)), Auxiliary Power Units (APU) and high speed electronic coolong fans. Environments characterized by high airflow velocity, extreme temperature, and humidity preclude use of lower cost acoustic attenuation media like foams. We have modeling software which enables us to predict insertion lost using customized silencer design.
ACOUSTICS TYPICAL ECS APPLICATION
Allied’s design experience includes high and low pressure ducting, ECS ram air inlets and exhaust packs.One of the issues with fibermetal acoustic treatment is the high cost. We have developed new lower cost metal fiber acoustic media without loss of the advantages.We have designed bleed air silencers for a business jet program that had limited space available, but required high levels of attenuation. Our solution helped reduce cabin and cockpit noise by 15 db(A). Within 9 months we designed and supplied silencers to retrofit the entire fleet of 134 aircraft. The silencers are manufactured at our AS9100 facility in Deland Florida.