Allied International Enters Bizav Market With Noise Reduction Solutions for Airframes, OEMs and Mod Centers

Allied International Corporation of Bedford Hills, NY has entered the business aviation market with short-turnaround acoustic attenuation solutions based on a durable, low-cost material that can be implemented in light-weight, compact configurations. Suitable applications include high- and low-pressure ECS ducting, APU inlets and exhausts, nacelles and fan ducts. Allied's products have been successfully applied in the Learjet 45, achieving significant noise reduction in the cockpit and cabin high- and low-pressure ECS ducting.

The acoustic material, branded AIC 1, is one of several vacuum-sintered stainless steel acoustical media that are designed for maximum sound attenuation. The material can be used as flat baffles or shaped into circular, conical or rectangular configurations and housed in stainless steel or aluminum enclosures. According to Allied International CEO Alec Ulmann, jr., AIC 1 offers a number of advantages over other, and often more costly, acoustic attenuation media:

It offers excellent broadband acoustic attenuation with exceptional performance at the more offensive high frequencies.

Its high-frequency performance is superior to perforated plate, while providing equivalent durability.

It is more durable than absorptive materials such as fiberglass or steel wool, which by their nature can absorb moisture and/or contaminate the air stream.

Its low pressure-drop characteristics maintain design airflow in retrofit applications.

It is corrosion-resistant, erosion-resistant and easily sanitized.

Allied has established its Acoustical Engineering Division in Ormond Beach, FL to develop solutions for aviation and industrial customers.

According to Acoustic Engineering Division Marketing Director, Darryl Sauer, AIC 1 is a "resistive" acoustic material in that it accomplishes its noise attenuation function by disrupting targeted sound waves with minimal airflow restriction. He noted that Allied's solutions are comprised of more than the acoustical material. He pointed out that aircraft noise problems really become apparent (or are acknowledged) late in the certification or customer acceptance process which imposes substantial schedule, size and weight constraints on any solutions. Allied has equipped itself to develop solutions under serious time pressure. To meet customer requirements, Allied's services include:

• Noise measurement and analysis
• Source isolation and identification
• Solution modeling using proprietary methodology
• Treatment recommendations
• Static acoustical testing of design concepts
• Prototype design and fabrication
• Manufacture of subassemblies or complete assemblies.