As stated in my last post this one is providing some details about ground vibration testing (GVT). These tests are performed at the end of the development process. The main goal is to collect vibration data. This data is used to validate the aircraft structure and is helpful to predict the flutter behavior of the plane. Due to their huge importance in safety-critical flight tests multiple configurations must be tested. This causes an extreme time pressure for the engineers. The GVT is economically important for aircraft manufacturers. The video below is displaying some of the GVT tests of the solar impulse airplane. Shakers excite the airplane and accelerometers placed all over the airplane collect the responses. It’s important the exact position of all the accelerometers is known accurately. An entire GVT cycles can be done in just under a month which is rather fast for placing 700 accelerometers and over 25km of wiring. (EADS-CASA completes large-scale Airbus A400M ground vibration test in less than a month’s time

You can find more information about GVT on the LMS site

You can also check out these interesting papers about GVT:

Advanced systems and services for Ground Vibration Testing –  Application for a research test on an Airbus A340-600 aircraft

Ground Vibration Testing of Large Aircraft – State-of-the-Art and Future Perspectives