Analytical and Experimental Study Using Output-Only Modal Testing for On-Orbit Satellite Appendages

Advances in Acoustics and Vibration ◽

10.1155/2009/538731 ◽

2009 ◽

Vol 2009 ◽

pp. 1-10 ◽

Cited By ~ 1

Author(s):

Mashiul Alam ◽

Ramin Sedaghati ◽

Yvan Soucy ◽

Rama B. Bhat

Keyword(s):

Experimental Study ◽

Model Updating ◽

Flexible Structures ◽

Modal Testing ◽

Modal Parameters ◽

Operational Conditions ◽

Orbit Satellite ◽

Potential Applications ◽

Output Only

Output-only modal testing is an effective technique to identify the modal parameters of structural systems under ambient or operational conditions and has potential applications in civil, mechanical, and aerospace engineering. It may effectively be used for model validation, model updating, quality control, and health monitoring through the determination of modal characteristics of the structures. This approach to modal testing has great potential for ground and on-orbit modal testing of space hardware, especially for flexible structures such as membrane payloads where the operating and ambient excitations, such as firing of AC thrusters and ambient thermal shock, are difficult or impossible to measure. The main objective of this work is to conduct analytical and experimental study on output-only modal testing and to demonstrate its potential application to effectively extract modal parameters of an on-orbit satellite appendage.

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Determination of the modal parameters of a single lap adhesively bonded joint using the transfer matrix method plus model updating

International Journal of Adhesion and Adhesives ◽

10.1016/j.ijadhadh.2020.102628 ◽

2020 ◽

Vol 101 ◽

pp. 102628

Author(s):

Andrew Melro ◽

Kefu Liu

Keyword(s):

Transfer Matrix ◽

Transfer Matrix Method ◽

Matrix Method ◽

Model Updating ◽

Modal Parameters ◽

Adhesively Bonded ◽

Bonded Joint ◽

Adhesively Bonded Joint

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Dynamic Assessment of the Iron Bridge at Paderno d’Adda (1889)

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.133-134.709 ◽

2010 ◽

Vol 133-134 ◽

pp. 709-714 ◽

Cited By ~ 2

Author(s):

Carmelo Gentile ◽

Antonella Saisi

Keyword(s):

Experimental Investigation ◽

Modal Analysis ◽

Dynamic Assessment ◽

Ambient Vibration ◽

Modal Parameters ◽

Dynamic Tests ◽

Operational Conditions ◽

Vibration Data ◽

Output Only ◽

Identification Techniques

The paper presents the experimental modal analysis recently carried out on the historic iron bridge at Paderno d’Adda (1889). The dynamic tests were performed in operational conditions (i.e. under traffic and wind-induced excitation) between June and October 2009 and different output-only identification techniques were used to extract the modal parameters from ambient vibration data. The described tests represent the first experimental investigation carried out on the global characteristics of the bridge, since the load reception tests of 1889 and 1892.

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FORCE APPROPRIATION METHOD FOR TWO DEGREES OF FREEDOM NONLINEAR SYSTEM

Jurnal Teknologi ◽

10.11113/jt.v76.5614 ◽

2015 ◽

Vol 76 (8) ◽

Author(s):

Mohd Shahrir Mohd Sani ◽

Muhamad Norhisham Abdul Rani ◽

Mohd Azmi Yunus ◽

Ahmad Azlan Mat Isa ◽

Liyana Roslan

Keyword(s):

Degrees Of Freedom ◽

Indicator Function ◽

Modal Testing ◽

Modal Parameters ◽

Nonlinear Structures ◽

High Quality ◽

Mode Identification ◽

Multivariate Mode ◽

Two Degree Of Freedom

In this paper, the vibrations of structures are investigated via force appropriation method in which modes are excited individually by forces. Multivariate mode indicator function (MMIF) is used in the modal testing for investigating the prospective nonlinearities in the structures. The method is applied to simulate two degree of freedom with simple nonlinearities. The results are presented and evaluated to indicate that the method has advantages when it comes to involving in mode by mode identification. Results calculated from modal assurance criteria (MAC) and modal purity indicator (MPI) show that the qualities of evaluating a pure normal mode are in satisfactory. This suggests that force appropriation method for nonlinear structures is reliable and efficient, particularly in terms of the isolation of individual modes and determination of high quality modal parameters.

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Determination of Material Parameters of FRP Plates With Rotational Flexibility at Boundaries Using Experimental Modal Testing and Model Updating

Experimental Mechanics ◽

10.1007/s11340-014-9981-0 ◽

2015 ◽

Vol 55 (5) ◽

pp. 803-815 ◽

Cited By ~ 7

Author(s):

A. K. Mishra ◽

S. Chakraborty

Keyword(s):

Model Updating ◽

Modal Testing ◽

Material Parameters ◽

Experimental Modal Testing

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Dynamic Characterisation and Finite Element Updating of a RC Stadium Grandstand

Buildings ◽

10.3390/buildings8100141 ◽

2018 ◽

Vol 8 (10) ◽

pp. 141 ◽

Cited By ~ 2

Author(s):

Filipe Santos ◽

Corneliu Cismaşiu ◽

Ildi Cismaşiu ◽

Chiara Bedon

Keyword(s):

Finite Element ◽

Model Updating ◽

Three Dimensional ◽

Modal Testing ◽

Ambient Vibration ◽

Fe Model ◽

Modal Parameter ◽

Ambient Vibration Tests ◽

Fe Model Updating ◽

Output Only

This paper reports on the dynamic characterisation of a Reinforced Concrete (RC) stadium grandstand module for the Sporting Stadium in Lisbon. To this aim, a three-dimensional (3D) Finite-Element (FE) numerical model, implemented according to the technical drawings of the structure, is first presented to provide preliminary estimates of the expected modal characteristics for the examined structural system. Ambient vibration tests are then carried out on the same grandstand, and used to extract the natural frequencies and vibration modes of the system, according to conventional state-of-the-art output-only modal parameter identification techniques. A sensitivity investigation and FE model updating study is hence presented for the grandstand, giving evidence of the major influencing parameters and key input data for the numerical fitting of the experimental modal testing results.

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

Journal of Vibration and Control ◽

10.1177/1077546320908457 ◽

2020 ◽

Vol 26 (21-22) ◽

pp. 1920-1934

Author(s):

Cagri Kocan

Keyword(s):

Frequency Domain ◽

Flight Test ◽

Modal Identification ◽

Modal Parameters ◽

Modal Parameter ◽

Operational Conditions ◽

Stochastic Subspace Identification ◽

Vibration Data ◽

Output Only ◽

Frequency Domain Decomposition

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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