XB-1 recently achieved another milestone on its Ground Vibration Test (GVT).

 

As XB-1 nears the end of ground testing before moving to Mojave for flight test, there are a variety of physical tests that must be performed on the ground before the aircraft can be proven safe to fly.

One of the more involved tests is the ground vibration test, or GVT. It's a unique test during which the aircraft is softly supported. It’s then “excited” by attaching electrodynamic shakers to the aircraft. 

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https://boomsupersonic.com/flyby/post/what-is-ground-vibration-testing