Mo­bile ground and flight vi­bra­tion test­ing sys­tem (SS­VA)

Vibration excitation
Vi­bra­tion ex­ci­ta­tion
Image 1/4, Credit: DLR (CC-BY 3.0)

Vibration excitation

Ex­ci­ta­tion of a wind tur­bine blade with a 1000 N long-stroke vi­bra­tion ex­citer in the Smart­blades 2 project.
Helicopter Shake Test
He­li­copter Shake Test
Image 2/4, Credit: © DLR. All rights reserved

Helicopter Shake Test

He­li­copter Shake Test on an AIR­BUS H145.
Vibroacoustics measurement
Vi­broa­cous­tics mea­sure­ment
Image 3/4, Credit: © DLR. All rights reserved

Vibroacoustics measurement

Vi­broa­cous­tic mea­sure­ment on an A400M fuse­lage MSN5 in the CO­CLEA project.
HALO research aircraft
HA­LO re­search air­craft
Image 4/4, Credit: © DLR. All rights reserved

HALO research aircraft

HA­LO un­der­go­ing in-flight test for vi­bra­tion and load anal­y­sis.

At the DLR Institute of Aeroelasticity in Göttingen, researchers are investigating the structural dynamic behaviour of aircraft, rotorcraft and wind turbines by means of vibration testing.

Structural dynamic testing

The Ground Vibration Test (GVT) Team of the Structural Dynamics and Aeroelastic System Identification department operates a measured data collection system with 384 input channels for conducting vibration tests.

The system has a modular design and can be equipped with different types of sensors, such as acceleration sensors, displacement sensors, force sensors, strain gauge sensors, a scanning laser vibrometer or temperature sensors. For excitation of structures ranging from a small wind tunnel model up to a real passenger aircraft, such as the AIRBUS A380, there are more than 30 electrodynamic shaker elements available with a maximum force of 20 N to 1000 N, as well as a range of different modal impact hammers.

The advantages of this system come not only with its size, but also with its experienced testing team, who use optimised processes for experimental modal analysis and are certified according to ISO 9001.

Using software developed specifically for this purpose, user-defined signals can be generated to induce excitation of structures, and the signals fulfil several criteria at once. In this way, signals can be calculated to correspond with limits defined by the client, for example maximum acceleration of various structural components, maximum deformation at the location of the shaker, etc., to guarantee a safe and quick vibration test.

The measured data can be evaluated directly on site while the test is ongoing. Upon request, a database with multi-user access can be provided, where the test progress and results can be followed.

In addition, it is also possible to combine the measuring system with an in-house, object-oriented MATLAB toolbox for system identification. Experimental and operational modal analysis can thus be directly applied to the time data collected.

In order to monitor the structures, structural dynamic properties (natural frequencies, eigenmodes, damping factors) can be identified in a fully automated way and tracked using environmental parameters (temperature, dynamic pressure, Mach number, rotor speed, etc.).

The algorithms in the toolbox are programmed to be smooth, efficient and speed optimised, so that any changes to the system can be detected within mere seconds. The system can even be operated remotely. Additionally, the system also allows for response measurements of 12,000 test points with efficient implementation and analysis of sensor networks.

Contact
  • Volker Speelmann
    Head of Cen­tral Ex­pen­di­ture Man­age­ment
    Ger­man Aerospace Cen­ter (DLR)
    Telephone: +49 2203 601-4103
    Fax: +49 2203 601 4115
    Linder Höhe
    51147 Cologne
    Contact
  • Prof. Dr.-Ing. Lorenz Tichy
    Head of In­sti­tute
    Ger­man Aerospace Cen­ter (DLR)
    In­sti­tute of Aeroe­las­tic­i­ty
    Telephone: +49 551 709-2341
    Fax: +49 551 709-2862

    Contact
  • Julian Sinske
    Team lead­er
    Ger­man Aerospace Cen­ter (DLR)
    In­sti­tute of Aeroe­las­tic­i­ty
    Struc­tural Dy­nam­ics and Sys­tem Iden­ti­fi­ca­tion
    Telephone: +49 551 709-2391
    Fax: +49 551 709-2862

    Contact

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