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Jianwei Yang, Changdong Liu, Peishan Liu and Yue Zhao
Cracks are one of the most common diseases of tunnel lining, and the structural dynamic response can be used to assess the health of a tunnel. Hence, this paper investigates the dynamic response of shield tunnel lining with a partly circumferential crack...
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Mariane Rodrigues Rita, Pierre Rossi, Eduardo de Moraes Rego Fairbairn and Fernando Luiz Bastos Ribeiro
This paper presents an extension of the validation domain of a previously validated three-dimensional probabilistic semi-explicit cracking numerical model, which was initially validated for a specific concrete mix design. This model is implemented in a f...
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In-Hoi Koo, Keon-Hyeong Lee, Min-Su Kim, Hyung-Seok Han, Holak Kim and Jeong-Yeol Choi
Fuel injection and mixing affect the characteristics of detonation initiation and propagation, as well as the propulsion performance of rotating detonation engine (RDE). A study on the injector is carried out in the present investigation. A rectangular-s...
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Kang Zhang, Ruize Ma, Tao Geng, Jiannan Yang and Yongjun Gong
The leakage of subsea oil and gas pipelines can have adverse impacts on production progress and the ecological environment. Investigating the sound source and near-field sound propagation of pipeline leaks is essential for understanding the acoustic char...
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Yujuan Qi, Xiumei Zhang and Lin Liu
Carbon dioxide geological utilization and storage (CGUS) is an effective way to mitigate climate warming. In this paper, we resorted to Lo?s model to analyze the dispersion and attenuation characteristics of unsaturated porous media. Based on this, we an...
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Ruoyun Liu and Zhenglin Li
As sea waves break, a bubble layer forms beneath the sea surface. The bubble scattering affects sound propagation, thus influencing the accuracy of sound field prediction. This paper aims to investigate the effects of bubble scattering on the statistical...
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Glen Throneberry, Adam Takeshita, Christopher Michael Hocut, Fangjun Shu and Abdessattar Abdelkefi
In this study, experimental investigations are used to explore the wake propagation and characteristics of a multi-rotor unmanned air vehicle (UAV) in a forward flight mission. Qualitative smoke visualization is used first to gain a qualitative understan...
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Bo Bai, Ziyang Zhao, Kai Yuan, Rongxin Tang, Xiaohua Deng, Mingyang Mao, Jiawei Xiong and Kaili Wang
Communication blackout is always a serious threat to the flight tasks of modern hypersonic vehicles moving in near space. EHF communication is considered as a potential solution to the blackout problem. Nevertheless, EHF waves suffer from severe attenuat...
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Xiaocui Yang, Kai Yuan, Yuhao Wang, Yiwen Liu and Jiawei Xiong
A large number of studies have confirmed that the wake region may be a more ideal antenna installation area for the reentry vehicle communication problem, but many practical issues such as how to choose the modulation mode, carrier frequency, and antenna...
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Jiaqi Liu, Shengchun Piao, Minghui Zhang, Shizhao Zhang, Junyuan Guo and Lijia Gong
Oceanic fronts involved by ocean currents led to strong gradients of temperature, density and salinity, which have significant effects on underwater sound propagation. This paper focuses on the impact of the oceanic front on three-dimensional underwater ...
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Cheng Fu, Xinglong Gao, Yunqiang Sun, Jie Kou, Dachuan Xu and Jingxiang Chen
The maglev flight tunnel is a novel conceptual aerodynamics test facility, in which the complicated aerodynamic characteristics caused by the high-speed translation of a moving model in a long, straight, closed tunnel, and wave propagation and aero-struc...
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Lan-tao Yang, Yi-min Shao, Wei-wei Jiang, Lu-ke Zhang, Li-ming Wang and Jin Xu
Tooth surface cracks are considered as the early stage of the development of tooth surface spalling failure. Understanding the excitation mechanism of surface cracks has a great significance in the early diagnosis of spalling faults. However, there are f...
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Bingyue Jia, Yining Zhang, Hao Meng, Fanxiao Meng, Hu Pan and Yanji Hong
Rotating detonation engines (RDEs) are a promising propulsion technology featuring high thermal efficiency and a simple structure. To adapt the practical engineering applications of ramjet RDEs, rotating detonation combustion using a liquid hydrocarbon a...
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Andrey Mikhaylenko, Natalie Rauter, Nanda Kishore Bellam Muralidhar, Tilmann Barth, Dirk A. Lorenz and Rolf Lammering
Guided ultrasonic waves are suitable for use in the context of structural health monitoring of thin-walled, plate-like structures. Hence, observing the wave propagation in the plates can provide an indication of whether damage has occurred in the structu...
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Xiaoyun Zhang, Xiaoan Zhang, Jiangang Xu, Li Yang and Gao Song
In the actual operation of urban rail transit (URT), the vibrations of steel-spring floating-slab tracks (SSFSTs) are amplified, and the track structure has strong low-frequency acoustic radiation; therefore, it is necessary to study the acoustic radiati...
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Qiao Chen, Fenglin Xu, Pengcheng Su, Honglin Zhu, Yifang Zhang, Yang Liu, Dongming Jia, Xiaozai Guo, Jilong Chen and Dunlong Liu
Meso-crack evolution mechanism of shale is a key factor affecting the mechanical properties of shale. In order to explore evolution laws of cracks in shale during loading, a meso-crack monitoring system, loading test equipment and an automatic ultrasonic...
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Tae-Min Oh, Min-Koan Kim, Jong-Won Lee, Hyunwoo Kim and Min-Jun Kim
As one of the non-destructive testing (NDT) methods, acoustic emission (AE) can be widely applied to the field of engineering and applied science owing to its advantageous characteristics. In particular, the AE method is effectively applied to monitor co...
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Yang Shi, Shuwen Wang, Fan Yang and Kunde Yang
Atmospheric ducts are special super-refractive atmospheric structures that can cause over-the-horizon propagation of electromagnetic waves. Different types of atmospheric ducts have different influences on electromagnetic wave propagation. Owing to the c...
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P. C. Iglesias, L. Godinho and J. Redondo
Extracting the microscopic parameters of a porous material is a complex task, and attempts have been made to develop models that can simulate their characteristics, gathering the least amount of information possible. As a case in point, tests to evaluate...
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Yuyin Chen, Yongqiang Zhang, Jing Tian, Zixuan Tang, Longhao Wang and Xuening Yang
As extreme climate events become more common with global warming, groundwater is increasingly vital for combating long-term drought and ensuring socio-economic and ecological stability. Currently, the mechanism of meteorological drought propagation to gr...
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