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Pilot studies on two dimensional wave propagation in rock masses LEI Wei-dong(雷卫东)1, M.H.Ashraf1, ZHAO Jian(赵 坚)1, 2 (1. School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798; 2. College of Architecture and Civil Engineering, China University of Mining and Technology, Xuzhou 221008, China) Abstract: Pilot studies on two dimensional(2-D) wave......
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J. Cent. South Univ. (2017) 24: 2504-2512 DOI: https://doi.org/10.1007/s11771-017-3663-x Heading control method and experiments for an unmanned wave glider LIAO Yu-lei(廖煜雷), LI Yi-ming(李一鸣), WANG...-Verlag GmbH Germany, part of Springer Nature 2017 Abstract: The control system designing of unmanned wave glider (UWG) is challenging since the control system is weak maneuvering, large time-lag......
基于Lamb波的复合材料结构分层损伤扩展监测研究王梓尧,严刚南京航空航天大学航空学院机械结构力学及控制国家重点实验室摘 要:分层损伤会严重削弱复合材料结构的强度和稳定性,对其进行监测和识别对保证结构安全具有重要意义.本文提出一种基于Lamb波和时频分析的方法,对复合材料结构中的分层损伤扩展进行在线连续监测.首先研究了Lamb波在含分层复合材料层合板中的传播特性,建立了Lamb波传播时间与分层长度之间的关系,为分层损伤扩展监测提供理论基础;然后采用小波变换对由压电传感元件激励和接收的Lamb波信号在时频域进行分析,测量出Lamb波在压电传感元件之间的传播时间用于确定分层长度等扩展情况.数值仿真和试验研究结果表明,随着分层长度的增加,Lamb波的传播时间逐渐延长,并与分层长度呈线性关系,可以通过小波变换提......
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STUDY ON THE SHOCK WAVE CRYSTALLIZATION OF AMORPHOUS ALLOYS BY DSC H.Wang1,Z.Q.Liu1,Q.J.Liu1,H.Y.Zhao1,J.D.Kan1 (1.Department of Materials Science and Engineering, Yunnan University, Kunming 650091, China) Abstract:Shock wave and annealing crystallization of amorphous alloys FeSiB, FeMoSiB andFeCuNbSiB were studied by isothermal and non-isothermal DSC technique. It wasfound that the shock wave......
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, China)Abstract:The temperature distributions of a prestressed concrete box girder bridge under the effect of cold wave processes were analyzed. The distributions were found different from those under... factors was performed. The results of sensitivity analysis show that the cold wave with shorter duration and more severe temperature drop may cause more unfavorable influences on the concrete box girder......
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