Abstract: In this review, we primarily address the present state of the arts and latest progresses in a few frontier issues mostly relevant to free surface/interface in ocean engineering. They include TC (tropical cyclone) induced extreme surface wave, sloshing of LNG (liquefied natural gas), cavitation/bubble dynamics and VIM (vortex-induced motion) and VIV (vortex-induced vibration). In addition to general description, we mainly focus on the recent advances and challenging aspects of above-mentioned topics. Inspired by the achievements in the previous 70 years, mankind starts a new round of ocean exploration activities. Then, we can find obvious trends: the realm of ocean engineering is expanding from sea surface to deep sea, from low and middle latitude to polar region and from fossil to renewable energy in near future.
Li J C, Nie B C, Lin H H trans. A few frontier issues in ocean engineering mechanics. AdvancesinMechanics, in press. doi: 10.6052/1000-0992-25-044.
Abstract: Thin-walled structures are commonly found in aircraft. As advanced aircraft evolve to meet the demands of wide speed ranges, transmedium capabilities, and large sizes, the vibro-acoustic environments of thin-walled structures have become increasingly complex. Consequently, there is a pressing need for low-frequency, wide-band and time-varying vibro-acoustic control. The rapid advancement of metastructures/metamaterials has opened new opportunities for breakthroughs in air-vehicle technologies. Thin-walled metastructures based on the local-resonance mechanism offer significant advantages in addressing the challenges of vibro-acoustic control of aircraft. This paper reviews the progress of passive and piezoelectric thin-walled metastructures, focusing on their vibration suppression and sound insulation capabilities, and provides a comparative analysis of their evolutionary process and technical features. It offers guidelines for designing thin-walled metastructures in advanced aircraft. First, the mechanisms of local-resonance bandgaps in both passive and piezoelectric thin-walled metastructures are explained, along with their sound-insulation mechanisms, which lays the theoretical foundation for introducing research progress of this area. Additionally, the research progress of thin-walled metastructures for vibration suppression and sound insulation is reviewed, with particular attention to nonlinear thin-walled metastructures. Subsequently, the applications of thin-walled metastructures in addressing vibro-acoustic control issues of air vehicles are discussed. Last, this paper offers future outlooks for thin-walled metastructures in air vehicles, focusing on optimal design, intelligent tuning, multifunctional integration, adaptability to extreme environments and precision manufacturing.
Zheng Y S, Yuan H B, Qu Y G, Meng G. Advances in thin-walled metastructures for vibration and noise control and their applications in aerospace engineering. AdvancesinMechanics, in press. doi: 10.6052/1000-0992-25-024.
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