Purpose of Tests
The acoustic noise test is performed to demonstrate the adequacy of materiel to resist the specified acoustic environment without unacceptable degradation of its functional performance and/or structural integrity.
Examples of problems that could occur when materiel is exposed to an acoustic Noise environment.
- Wire chafing
- Component acoustic and vibratory fatigue
- Component connecting wire fracture
- Cracking of printed circuit boards
- Failure of wave guide components
- Intermittent operation of electrical contacts
- Cracking of small panel areas and structural elements
- Optical misalignment
- Loosening of small particles that may become lodged in circuits and mechanisms
- Excessive electrical noise.
Procedures
Procedure I (Diffuse Field Acoustic Noise)
Diffuse Field Acoustic Noise. Procedure I has a uniform intensity shaped spectrum of acoustic noise that impacts all the exposed materiel surfaces.
Procedure II (Grazing Incidence Acoustic Noise)
Includes a high intensity, rapidly fluctuating acoustic noise with a shaped spectrum that impacts the materiel surfaces in a particular direction generally along the long dimension of the materiel.
Procedure III (Cavity Resonance Acoustic Noise)
the intensity and, to a great extent,the frequency content of the acoustic noise spectrum is governed by the relationship between the geometrical configuration of the cavity and the materiel within the cavity.
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