Ground Vibration Testing

Shortly before a new aircraft’s maiden flight or after significant structural modification of existing aircraft, ground vibration testing and modal survey testing are administered. The vibration test experimentally measures the dynamic characteristics of the aircraft in different configurations to validate the models used during the aircraft design and for flutter behavior prediction.The ground vibration test (GVT) system is necessary to assure the aeroelastic and aeroservoelastic stability of new and modified aircraft.

These GVT data are used to validate analytical vibration and flight control models by measuring flight control transfer functions and structural frequency response functions. The GVT supports flight test activities by assisting in flutter test planning and resolving in-flight aeroelastic related anomalies. It is also used to detect structural flaws and troubleshoot flight control dynamic problems. The GVT system consists of state-of-the-art equipment including aircraft soft-support, structural excitation, vibration sensors, and data acquisition and analysis tools.

Soft-support systems are used to simulate the free-free (unconstrained) boundary conditions that an aircraft experiences during flight. Data taken is used for modal analysis and finite
element (FE) model correlation, and for loads analysis to prevent structural failure and for flutter certification.

BHSPL provides end to end solution for GVT and Flutter Prediction in India utilizing the services of experts in the field and with rich experience of certifications from CEMILAC / RCMA and with civil aviation agencies.