Impacts of panel vibration on shock train structures and performance of two-dimensional isolators

Meng, Xianzong; Ye, Zhengyin; Hong, Zheng; Ye, Kun

doi:10.1016/j.ast.2020.105978

Cited by 14 publications

(5 citation statements)

References 39 publications

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“…The numerical configuration of the isolator, as illustrated in Figure 3, is based on our previous research endeavors [12][13][14]. The computational configuration employs a 2-D isolator with a rectangular geometry that maintains a constant width.…”

Section: Computational Configurationmentioning

confidence: 99%

“…However, the aeroelastic challenges associated with the isolator have not received as much attention, despite their significant implications for the development of future hypersonic vehicles [10,11]. To address this gap, a series of numerical studies have been initiated, focusing on the effects of flexible structures on the isolator's flow field and performance [12][13][14][15][16][17]. This research constitutes an integral part of these ongoing efforts.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, recent studies have revealed that the FSI between thin-walled panels and the internal flow of isolators is considerably more complex. Meng's studies [12,13] have demonstrated that forced structural vibrations significantly influence the flow structures and performance of the isolator. In this context, thin-walled plates were placed in an isolator with an incoming Mach number of 1.6 to investigate the FSI between the normal shock train and the thin-walled plates.…”

Section: Introductionmentioning

confidence: 99%

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Fluid–Structure Interactions between Oblique Shock Trains and Thin-Walled Structures in Isolators

Meng,

Zhao,

Wang

et al. 2024

Aerospace

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Understanding aeroelastic issues related to isolators is pivotal for the structural design and flow control of scramjets. However, research on fluid–structure interactions (FSIs) between thin-walled structures and the isolator flow remains limited. This study delves into the FSIs between thin-walled panels and the isolator flow, as characterized by an oblique shock train, by quantitatively analyzing 11 flow parameters assessing the structural response, separation zones, shock structures, flow symmetry, and performance. The results reveal that an FSI triggers panel flutter under oblique shock train conditions, with the panel shapes exhibiting a combination of first- and second-mode responses, peaking at 0.75 of the panel length. Compared to rigid wall conditions, isolators with a flexible panel at the bottom wall experience downstream movement of the separation zones and shock structures, reduced flow symmetry, and minor changes in performance. Transient fluctuations occur due to the panel flutter. Two flexible panels at the top and bottom walls have a comparatively lesser influence on the averaged parameters but exhibit more violent transient fluctuations. Furthermore, the FSI effects under oblique shock train conditions are contrasted with those under normal shock train conditions. The flutter response under normal shock train conditions is more pronounced, with a larger amplitude and higher frequency, driven by the heightened participation of the first-mode response. The effects of FSIs under normal shock train conditions on the averaged parameters are the opposite (with a larger influence) to those under oblique shock train conditions, with significantly more drastic transient fluctuations. Overall, this study sheds light on the complex and substantial influence of FSIs on the isolator flow, emphasizing the necessity of considering FSIs in future isolator design and development endeavors.

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Section: Computational Configurationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fluid–Structure Interactions between Oblique Shock Trains and Thin-Walled Structures in Isolators

Meng,

Zhao,

Wang

et al. 2024

Aerospace

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“…Generally, the standard solutions to eliminate and minimize the vibration are by redesign the system, stiffening the structure, applying damping materials on vibrating structure to dampen the response, and adding resonators such as vibration absorber to absorb vibration among other methods [18,19]. These requests promote the development of polymer composites-a combination of two or more materials, which has the potential to provide value-added properties absent in polymer [20].…”

Section: Introductionmentioning

confidence: 99%

Experimental and simulation study on active vibration control of rotating machines using coconut-husk fiber composite

Rafiu O. Kuku,

Sunday S. Oladapo,

Nurudeen A. Raji

2024

Global J. Eng. Technol. Adv.

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Vibrations may reduce the quality of products because of “chatter” during drilling operation, which may cause dimensional inaccuracy of drilled holes, poor surface finish, assembly, and operational problems. This therefore calls for the need for vibration absorbers or dampers. The drilling machine considered in this research was the MODIGS RBM 28B Radial Arm Drill. The vibrations during drilling operation of this machine were measured with the use of a Vibration Meter. This experiment was carried out on different metal workpieces which vary in their toughness and hardness; hence, the drilling machine was expected to vibrate with different amplitudes and frequency for these different metals. In this experiment, Coconut Fibre was successfully simulated. The success was measured from how much of displacement the simulated coconut fiber composite absorbed and dampen down, keeping the machine to work at its optimum performance without excessive vibration, which normally could result to failure of machine components poor surface finish, and dimensional inaccuracy of holes.

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“…8 Studies on panel flutter in supersonic flow are thoroughly examined and reviewed by Dowell 9 and Mei. 10 In recent years, with the increasing attention on the development of supersonic or hypersonic flight vehicles, 11,12 panel flutter remains an important design consideration. Baghdasaryan and Mikilyan 13,14 conducted a detailed parametric analysis of the nonlinear characteristics of LCO amplitude-frequency and amplitude-speed dependency for panels fluttering at supersonic speeds, where a mathematical model based on the von Kármán's plate theory and the nonlinear equations of motion for a panel subjected to supersonic flow were developed.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of characteristic change of panel flutter caused by oblique shock impingement

Meng,

Ye,

2023

Proceedings of the Institution of Mechanical Engineers, Part G:

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Compared to the shock-free condition, the weak shock impingement stabilizes the flexible panel, while the strong shock impingement leads to the early onset of panel flutter with a significant increase in flutter amplitude and frequency. However, the reason for this change by shock impingement remains unclear. The current research examines the mechanism of this change by an in-house code where the von Kármán’s large deflection plate theory is coupled with two-dimensional Euler equations. Compared to the shock-free condition, the oblique shock impingement leads to the change of local dynamic pressure on the panel as well as the static pressure differential across the panel. The analysis on the influence of these changes indicates that, on the one hand, the average dynamic pressure on the panel becomes larger than the shock-free condition, accelerating the onset of panel flutter. On the other hand, the change of the static pressure differential across the panel alters the coupling characteristic between different natural frequencies (modes) of the panel structure. The dynamic response of panel flutter under shock impingements is dominated by the coupling between the second and third modes instead of the first two modes for panel flutter under the shock-free condition. The combined effect of these two changes leads to the change of flutter characteristics of the panel under shock impingement. These findings provide valuable insights into the mechanism of shock-induced panel flutter.

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Impacts of panel vibration on shock train structures and performance of two-dimensional isolators

Cited by 14 publications

References 39 publications

Fluid–Structure Interactions between Oblique Shock Trains and Thin-Walled Structures in Isolators

Fluid–Structure Interactions between Oblique Shock Trains and Thin-Walled Structures in Isolators

Experimental and simulation study on active vibration control of rotating machines using coconut-husk fiber composite

Mechanism of characteristic change of panel flutter caused by oblique shock impingement

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