Testing Acoustic Fatigue
Rigorous acoustic fatigue testing is crucial to ensure the resilience of spacecraft and their components. The Beijing Institute of Strength and Environmental Engineering (BISEE) is part of the China Academy of Launch Vehicle Technology, one of the world’s largest centers for launch vehicle research, design and manufacture. BISEE uses an m+p international system with a total of more than 760 channels to perform environmental and reliability testing, including acoustic fatigue and vibration testing on various types of missile, rocket, satellite, ground equipment and instrumentation. It serves both as a vibration control system for shaker testing and as an acoustic control system for progressive wave tubes (PWTs) and reverberant acoustic test facilities (RATFs).
BISEE employs m+p VibControl software and eight m+p VibRunner hardware modules, each with 16 analog input channels and two analog output channels, to provide fully automatic, repeatable closed-loop control of its 12 PWTs. Separate control profiles can be defined for each PWT. The institute performs acoustic control and testing of large assemblies such as satellites in its RATFs. A key benefit of the m+p system is that each drive signal can be stored for later use, avoiding the need for an equalization stage and speeding up test time. Safety features include automatic microphone drop-out exclusion and extensive octave band and OASPL (overall sound pressure level) alarm and abort checks.
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