Primarily used in acoustic test chambers, the WAS-5000 acoustic transducer is an electro-pneumatic noise source rated at 10 kW output over a frequency range of 25 to 5,000 Hz.
The WAS-5000 provides a full range of noise evaluation for large components used in spacecraft, missile, and advanced aircraft systems. It uses the principle of vibrating vanes to reproduce exact sine wave, random noise and sine-random combinations.
Simulation Testing Applications
Pre-flight qualification testing of structures and components provides added assurance of meeting the high reliability requirements of aerospace vehicles. Vibration during launch and flight operations is a major concern. Since pressure fluctuation over the external skin is the principal source of vibration in modern flight vehicles, acoustic energy offers a logical and effective simulation tool for reliability testing.
Acoustic test facilities which simulate these external pressure fluctuations can –be used for structural and component testing. Qualification tests can be designed to evaluate designs, to gauge reliability and to provide total system checkout.
Stable, Reliable Operation
The WAS-5000 uses an inductive drive system acting on its reciprocating valve assembly.
The transducer consists of a magnetic structure which houses and supports two driver coils. It also includes a hollow conductor field coil that is water-cooled, while the driver coils are cooled by air, water droplets, and vapor through the use of an external cooling system. This high-efficiency cooling system permits use of the high currents required for high-frequency operation.
The driver coils in conjunction with the field coil are inductively coupled to the reciprocating valve’s single shorted turn. The modulation valve incorporates two concentric cylinders, each having rows of modulation slots. With air pressure applied outside of the reciprocating valve cylinder, air is forced through these slots.
Motion in the reciprocating valve increases and decreases the opening size of the modulation slots, based upon the polarity of the electrical input signal. This process breaks the air stream into “puffs” which become pressure pulses at the discharge of the WAS-5000.
The advantages of this reciprocating vane modulator is that a true random noise input produces a true random noise output and any additional signal – such as discrete frequencies or sweeps – can be superimposed on the random noise.
This design allows the valve to obtain the extremely high acceleration levels necessary for operation at high frequencies.
The WAS-5000 converts approximately 1500 scfm (42.5 m3/min.) at 30 psig (2 bars) of airflow into 10,000 acoustic watts, with a linear relationship of air flow to power output.
Contact us today to learn the full specifications of the WAS-5000 and how NTS can help you upgrade your RATF.
Since 1949, NTS has provided specialized testing and simulation services to the aerospace, defense, and commercial industries. We own and operate several reverberant and progressive wave acoustic test facilities to meet short-term test requirements.
For clients with more greater needs, we can provide turnkey acoustic facility development and engineering support. NTS is also prepared to take single-source responsibility for design, engineering, construction management, instrumentation and control systems, operation, maintenance, and personnel training.