Ground Vibration Test (GVT)

In aircraft ground vibration testing (GVT), large modal tests for different aircraft configurations on the ground are performed to update the flutter boundary predictions before the first test flight is made.

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VIBRATION TRANSDUCERS

Accelerometers

Piezoelectric CCLD Accelerometer designed for modal analysis and Triaxial CCLD Piezoelectric Accelerometer used for structural analysis measurements.

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DAQ SOFTWARE

BK Connect

Modular software for optimizing your products' dynamic properties and behaviour – from initial concept to final certification and beyond, including structural health monitoring.

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Challenges in Ground Vibration Test

Virtual simulation has dramatically accelerated the overall aircraft development process. However, physical testing remains a critical contributor to both validation of the simulation models and the understanding of structural characteristics of new materials and manufacturing processes.

Ground Vibration Test (GVT) is used to determine the modal parameters of a complete aircraft and is typically performed very late in the development process. The outcome is used to update the aircraft’s analytical models to predict the flutter boundaries (combinations of altitude and speed) and establish a safe flight envelope before the first test flight. Following the test flights, the analytical models are updated, the final flutter calculations made, and the aircraft obtains its airworthiness certification.

Ground Vibration Test is mandatory for new aircraft and for existing aircraft that undergo modifications. It is also performed on other structures such as helicopters and spacecraft.

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System Suggestion

A typical GVT system consists of modal exciter systems, modal accelerometers and LAN-XI data acquisition hardware. Measurements and post-processing are carried out with BK Connect® software. The test geometry is defined based on a Finite Element (FE) model of the test object. The FE model also provides the basis for a pre-test analysis to define excitation and response DOFs (Degree-Of-Freedoms) and for investigation of target modes.

This system is scalable, depending on the size of the test object, and especially for larger objects, the LAN-XI data acquisition hardware can be distributed, to minimize cabling.

Watch NASA perform Ground Vibration Testing with BK Connect

electric-power-testing - testcenter electric aircraft 01

White Paper: How Electrification is Changing Aircraft Testing

Advances in electric propulsion create new possibilities for new structural geometries. All aircraft require testing for structural integrity before they can be considered flightworthy, but these new geometries require even more attention. Similarly, the new propulsion methods need to be characterized and optimized for flightworthiness and maximize range.

This paper will look at the importance of ground vibration testing and why it should be considered when developing electric propulsion systems.

Download the white paper as PDF download

Ground Vibration Test Products

TYPE 8411 | BK CONNECT

Structural Measurements – Hammer and Shaker

Intuitive software for geometry-guided real-time hammer and shaker measurements used for classical modal analysis.

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TYPE 8412 | BK CONNECT

Advanced Sine Measurement Software

Advanced Sine Software for real-time measurements of frequency response functions (FRFs) using stepped sine excitation for linearity studies and classical modal analysis.

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TYPE 8420 | BK CONNECT

Modal Analysis Software

Provides powerful tools for creating geometries and a comprehensive set of analysis and validation tools for single-reference modal analysis.

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TYPE 8420-A | BK CONNECT

Advanced Modal Analysis

Advanced Modal Analysis software for creating geometries and a comprehensive set of analysis and validation tools for polyreference modal analysis.

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TYPE 8421 | BK CONNECT

Correlation Analysis Software

Correlation Analysis Software for correlating two modal models, typically consisting of a finite element model and a test model.

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TYPE 4507-B

Piezoelectric CCLD Accelerometer, TEDS, 1 mV/g, Side Connector, 1 Slot, Excl. Cables

Designed for modal analysis measurement.

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TYPE 4524-B

Triaxial CCLD Piezoelectric Accelerometer, TEDS

Designed for structural analysis measurements.

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