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Aerospace
Special Issues
Structural Dynamics and Control (2nd Edition)
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Structural Dynamics and Control (2nd Edition)

A special issue of Aerospace (ISSN 2226-4310).

Deadline for manuscript submissions: closed (15 March 2024) | Viewed by 6328

Special Issue Editor

Prof. Dr. Hekmat Alighanbari

E-Mail Website
Guest Editor
Department of Aerospace Engineering, Ryerson University, Toronto, ON M5B 2K3, Canada
Interests: fluid–Structure Interactions; nonlinear dynamics, and control; unsteady aerodynamics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Owing to the push for environmental sustainability in aviation and the development of advanced materials and manufacturing techniques, modern aerospace vehicles are moving towards more lightweight and complex structures. This produces challenges for structural dynamics researchers, who are continuing to advance the technology needed to accurately model, analyze and control the response of modern aerospace structures to dynamic loads.

The aim of this Special Issue is to serve the scientific community through dissemination of the latest achievements on analytical, numerical and experimental investigations pertaining to structural dynamics analysis and the control of aerospace bodies.

Original unpublished manuscripts are solicited in all areas of structural dynamics and control, including, but not limited to:

  • Morphing structures.
  • Adaptive Structures.
  • Smart structures.
  • Bistable structures.
  • Structural health monitoring.
  • Vibration energy harvesting.
  • Structural vibration control.
  • Nonlinearity detection, identification and modeling.
  • Stability and control investigations related to fluid–structure interactions.

Prof. Dr. Hekmat Alighanbari
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Aerospace is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (4 papers)

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Research

16 pages, 5767 KiB  
Article
Effect of Multi-Joint Clearance Coupling on Shimmy of Nose Landing Gear
by Guang Feng, Bingyan Jiang and Yiyao Jiang
Aerospace 2023, 10(11), 911; https://doi.org/10.3390/aerospace10110911 - 25 Oct 2023
Viewed by 1151
Abstract
The existence of joint clearances in the nose landing gear (NLG) is inevitable and significantly affects shimmy. It was found that the interaction of each joint clearance is closely related to the analysis of shimmy stability. In this study, the shimmy model of [...] Read more.
The existence of joint clearances in the nose landing gear (NLG) is inevitable and significantly affects shimmy. It was found that the interaction of each joint clearance is closely related to the analysis of shimmy stability. In this study, the shimmy model of NLG with three-dimensional joint clearance was established by using LMS VirtualLab Motion. Based on the method of multibody dynamics (MBD), the load transfer mechanism at the joints of the NLG was analyzed, and the oscillation characteristics with multiple joint clearances were investigated. The results indicate that the radial and axial contact force of the joint decreases from bottom to top, and the radial contact forces are relatively high at the end positions of the connection shafts, resulting in uneven wear. When the joint clearance reaches a certain value, periodic shimmy of the NLG will occur, and an increase in torsional damping can reduce the amplitude of the shimmy. Therefore, this study reveals the influence of multi-position joint clearance coupling on shimmy, and provides a valuable insight for the maintenance and design of landing gear joints. Full article
(This article belongs to the Special Issue Structural Dynamics and Control (2nd Edition))
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26 pages, 14250 KiB  
Article
Experimental and Numerical Modal Analysis of a Composite Rocket Structure
by Taruansh Qaumi and Seyed M. Hashemi
Aerospace 2023, 10(10), 867; https://doi.org/10.3390/aerospace10100867 - 04 Oct 2023
Viewed by 1613
Abstract
Finite Element Analysis (FEA) is a powerful tool that can aid in the engineering design process to reduce cost and time. However, it is best used in conjunction with experimental data, through which its numerical results can be verified. This paper presents the [...] Read more.
Finite Element Analysis (FEA) is a powerful tool that can aid in the engineering design process to reduce cost and time. However, it is best used in conjunction with experimental data, through which its numerical results can be verified. This paper presents the experimental and numerical modal analyses of an experimental rocket aerostructure to verify the accuracy of the numerical models. This aerostructure has been through flight loads and a recovery. The first numerical results for the rocket showed a 96% difference with the experimental ones. Subsequently, three mass refinements were made to create calibrated FEM models whose results differed from the experimental ones by 19% to 8%. Additionally, as expected, the FEM results tended to overestimate the stiffness of structures. The numerical simulations for all components were performed through ANSYS software, and the experiments were conducted using the hammer tap test with laser vibrometers as sensors. Full article
(This article belongs to the Special Issue Structural Dynamics and Control (2nd Edition))
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17 pages, 4800 KiB  
Article
Evaluation of Joint Clearance Effects on the Shimmy of Nose Landing Gear
by Yiyao Jiang, Guang Feng, Panglun Liu, Li Yuan, Jianbin Ding and Bingyan Jiang
Aerospace 2023, 10(8), 722; https://doi.org/10.3390/aerospace10080722 - 17 Aug 2023
Cited by 1 | Viewed by 1771
Abstract
Through the establishment of a three-dimensional joint clearance model, the effects of joint clearances at different positions on shimmy stability are evaluated. In this paper, considering the radial, axial and coupling characteristics of joint clearance, the shimmy multibody dynamics (MBD) model is applied [...] Read more.
Through the establishment of a three-dimensional joint clearance model, the effects of joint clearances at different positions on shimmy stability are evaluated. In this paper, considering the radial, axial and coupling characteristics of joint clearance, the shimmy multibody dynamics (MBD) model is applied to different joints in the nose landing gear (NLG) transmission system. It is proposed to evaluate the influence of joint clearance on shimmy from two aspects of position factor and wear factor. The study found that different joint clearances have different effects on shimmy: the joint clearance between the NLG and fuselage has little influence on shimmy; the larger axial clearance of upper and lower torque link joint will cause the shimmy of the NLG, but the radial clearance has no effect on shimmy; while the joint clearance between turning sleeve and upper torque link, lower torque link and piston only works in the axial and radial coupling. The reasons for the different influence characteristics of each joint space are analyzed. Consequently, studying and summarizing the influence of different clearance on shimmy is of great significance for the design and maintenance of the NLG joints. Full article
(This article belongs to the Special Issue Structural Dynamics and Control (2nd Edition))
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20 pages, 5345 KiB  
Article
The Accuracy and Computational Efficiency of the Loewner Framework for the System Identification of Mechanical Systems
by Gabriele Dessena, Marco Civera, Dmitry I. Ignatyev, James F. Whidborne, Luca Zanotti Fragonara and Bernardino Chiaia
Aerospace 2023, 10(6), 571; https://doi.org/10.3390/aerospace10060571 - 20 Jun 2023
Cited by 2 | Viewed by 1271
Abstract
The Loewner framework has recently been proposed for the system identification of mechanical systems, mitigating the limitations of current frequency domain fitting processes for the extraction of modal parameters. In this work, the Loewner framework computational performance, in terms of the elapsed time [...] Read more.
The Loewner framework has recently been proposed for the system identification of mechanical systems, mitigating the limitations of current frequency domain fitting processes for the extraction of modal parameters. In this work, the Loewner framework computational performance, in terms of the elapsed time till identification, is assessed. This is investigated on a hybrid, numerical and experimental dataset against two well-established system identification methods (least-squares complex exponential, LSCE, and subspace state space system identification, N4SID). Good results are achieved, in terms of better accuracy than LSCE and better computational performance than N4SID. Full article
(This article belongs to the Special Issue Structural Dynamics and Control (2nd Edition))
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