Acoustic test

ISO 1680-1, Acoustics - Test code for the measurement of airborne noise emitted by rotating electrical machinery... 

H. Kast (104-07) Determination of Sensitivity to Friction (Medicion de la sensibili-dad al rozamiento) (107) Determination of Sensitivity to Initiation by Detonation (110-12) Determination of Sensitivity to Initiation by Influence (112-13) Determination of Power of Explosives using Trauzl Test (113-17), Small Lead Block Test (117), Quinan Apparatus (118), Guttmann Apparatus (118-19), Ballistic Pendulum (119-20), Mortar (Mortero probeta) (120-21) Determination of Efficiency of Initiating Devices by Lead Plate Test (121-23), Nail Test (123), Sand Test (124) and Acoustic Tests (124) Determination of Characteristics of Flames Produced on Explosion (125-29)... 

Srisawas, W. and Jindal, V.K. Acoustic testing of snack food crispness using neural networks, /. Texture Stud., 34, 401, 2003. 

ACOUSTIC TEST FLIGHT RESULTS WITH PREDICTION FOR MILITARY AIRCRAFT DURING FCLP MISSION... 

After selection of the mission profile for the acoustic test was determined, NAS Patuxent River s Propulsion Department utilized their flight simulator and cycle deck for the engine to determine both aircraft and engine parameters needed to compute ground-based acoustic signatures. Table 4.2 lists all parameters needed to exercise the NASA LaRC systems noise prediction code ANOPP. In Table 4.2,... 

Seiner, J. M., L. S. Ukeiley, and B. J. Jansen. 2002. Acoustic test flight results with prediction for the F/A-18 E/F aircraft during FCLP mission. In Energy conversion propulsion New horizons. Ed. G. D. Roy. Washington, D.C. Office of Naval Research. 245-58. 

FIGURE 5-30 Acoustic test section used to measure solid/gas flow noise. 

The stimulated acoustic test is a basic test based on the difference in oscillatory behavior of the composite layer with or without adherence to the layer underneath. 

Anechoic (echo-reducing) coatings to reduce tank-wall reflections are needed in many underwater acoustic test facihties. One effective design utiHzes butyl... 

During acoustic testing at a major transit authority s elevated structure it came out that the softer the compression and shear stiffnesses of the direct-fixation elastomeric rail fastener, the better the acoustic performance. Figure 5-73 shows the noise-level reduction available from using soft elastomeric rail fasteners instead of stiff ones. The soft fastener has approximately 50 percent of the stiff fastener s spring rate. This figure shows the average wayside noise levels at 30 m (100 ft.) from an elevated structure for train operation on soft fasteners compared to stiff ones. 

Although more sophisticated acoustical test equipment is capable of deriving d(B) directly, it is far more common for test equipment to have merely A and C weighting. A and C weighting both reduce the contribution that low frequencies... 

Acoustic testing and evaluation of textiles for buildings and office environments... 

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