Efficient ground vibration testing of aircraft based on output-only modal analysis during taxi

Govers, Yves; Sinske, Julian; Schwochow, Jan; Jelicic, Goran; Buchbach, Ralf; Springer, Julian; Böswald, Marc

doi:10.2514/6.2017-1824

Cited by 4 publications

(4 citation statements)

References 2 publications

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“…For instance, although short-period roll mode is around 0.5 Hz after the aircraft takes off, it is around 2.6 Hz when the aircraft is on taxi because the resistance to roll increases on ground. By considering these outcomes, the vibration data collected in taxi can be an alternative to the traditional GVTs (Govers et al, 2017).…”

Section: Resultsmentioning

confidence: 99%

A comparative study on in-flight modal identification of an aircraft using time- and frequency-domain techniques

Kocan

2020

Journal of Vibration and Control

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In this study, in-flight modal identification analyses are made based on vibration data collected during a flight test of an aircraft, by using two different output-only identification techniques: frequency domain decomposition and data-driven stochastic subspace identification. The purpose of this study was to evaluate and compare the efficacy of the two methods in modal parameter estimation and to validate their capability in dealing with some challenging tasks such as time tracking of modal parameters and estimating modal damping ratios. In addition, the effects of different environmental conditions and maneuvers are investigated by separating the flight-test data, such as static engine start, taxi, takeoff, cruise, roll, climb, descend, and yaw maneuvers. It is demonstrated that the selection of operational conditions and maneuvers plays a crucial role in identifying the modal parameters of the aircraft.

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Section: Resultsmentioning

confidence: 99%

A comparative study on in-flight modal identification of an aircraft using time- and frequency-domain techniques

Kocan

2020

Journal of Vibration and Control

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“…The main fnding of this work was that the level of excitation is a function of the taxiing speed and that it increases with the taxiing speed. It will also lead to a shift of the excited frequency range towards higher frequencies at the cost of lowering the excitation levels at lower frequencies [8,10]. In addition to the infuence of the taxiing speed on the level of excitation, it was found that the level of excitation is dependent on the roughness of the ground or runway as well [10].…”

Section: Recent Investigations Into Taxi Vibration Testmentioning

confidence: 99%

“…Research is continuing to advance the TRL of this newly developed aircraft vibration test method to the point where it becomes accepted by certifcation authorities as an alternative to a conventional GVT [8,9]. The testing of the TVT method has been Additional research has been carried out in this feld to investigate the infuence of the taxiing speed on the level of excitation and the detected vibration modes during TVT [8,10]. The main fnding of this work was that the level of excitation is a function of the taxiing speed and that it increases with the taxiing speed.…”

Section: Recent Investigations Into Taxi Vibration Testmentioning

confidence: 99%

“…or the B737, hundreds of accelerometers are needed so that acceleration responses throughout the aircraft frame can be acquired simultaneously. Several electromechanical shakers are then used with maximum force levels in the range of 1000N and long coil stroke to the aircraft structure [8]. In addition to the requirements of specifc equipment, the additional challenge of exciting the aircraft at fexible excitation points, such as wingtips or winglets, puts additional pressure during the GVT test.…”

Section: Introduction 11 Motivation Of the Research Problemmentioning

confidence: 99%

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Experimental and Computational Investigation of a Highly Flexible Airframe Taxiing Over an Uneven Runway for Aircraft Vibration Testing

Al-Bess¹

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Ground Vibration Test (GVT) is an important phase of the development of new aircraft prototypes, or the structural modifcation of an existing ones, to experimentally determine the modal parameters such as fundamental frequencies and mode shapes of aircraft prototypes. These modal parameters are used to validate and update the fnite 3.7 Flexible multibody dynamics model of the aircraft in MSC.Adams . .

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Computational Investigation of a Flexible Airframe Taxiing Over an Uneven Runway for Aircraft Vibration Testing

Al-bess,

Khouli

2023

SAE Int. J. Aerosp.

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<div>Ground vibration testing (GVT) is an important phase of the development, or the structural modification of an aircraft program. The modes of vibration and their associated parameters extracted from the GVT are used to modify the structural model of the aircraft to make more reliable dynamics predictions to satisfy certification authorities. Due to the high cost and the extensive preparations for such tests, a new method of vibration testing called taxi vibration testing (TVT) rooted in operational modal analysis (OMA) was recently proposed and investigated by the German Institute for Aerospace Research (DLR) as alternative to conventional GVT. In this investigation, a computational framework based on fully coupled flexible multibody dynamics for TVT is presented to further investigate the applicability of the TVT to flexible airframes. The time domain decomposition (TDD) method for OMA was used to postprocess the response of the airframe during a TVT. The framework was then used to examine the impact of the taxiing speed, shock absorber damping coefficient, and bump geometry on the outcome of the computational TVT. It was found that higher taxiing speed does not necessarily mean a better quality TVT, and one must find the optimal speed using the computational framework presented herein. A higher shock absorber damping coefficient was found to increase the amplitude of the response during the TVT without significantly impacting the extracted modes and their frequencies. Also, the quality of the TVT was found to be inversely proportional to the curvature of the bump cross section. The proposed TVT computational framework is validated against the normal modal analysis technique and certain experimental data.</div>

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Efficient ground vibration testing of aircraft based on output-only modal analysis during taxi

Cited by 4 publications

References 2 publications

A comparative study on in-flight modal identification of an aircraft using time- and frequency-domain techniques

A comparative study on in-flight modal identification of an aircraft using time- and frequency-domain techniques

Experimental and Computational Investigation of a Highly Flexible Airframe Taxiing Over an Uneven Runway for Aircraft Vibration Testing

Computational Investigation of a Flexible Airframe Taxiing Over an Uneven Runway for Aircraft Vibration Testing

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