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结构振动声强法研究及应用 被引量:7
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作者 李凯 赵德有 黎胜 《应用声学》 CSCD 北大核心 2010年第5期391-400,共10页
振动声强技术通过绘制功率流矢量图和流线图来分析结构噪声源及能量传播路径,可以清晰体现振动声能的分布和传播。对振动和噪声控制具有重要的理论意义和应用前景。本文总结了振动声强试验和理论计算技术的发展,并推导了受迫振动板中声... 振动声强技术通过绘制功率流矢量图和流线图来分析结构噪声源及能量传播路径,可以清晰体现振动声能的分布和传播。对振动和噪声控制具有重要的理论意义和应用前景。本文总结了振动声强试验和理论计算技术的发展,并推导了受迫振动板中声强分量与振动能量的数学关系;最后对振动声强法在复杂结构振动功率流控制和结构损伤识别中的应用进行了展望。 展开更多
关键词 振动声强 声强试验技术 结构噪声 振动功率流 损伤识别
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耦合板结构振动波传递及能量分布可视化研究 被引量:10
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作者 李凯 黎胜 赵德有 《船舶力学》 EI 北大核心 2011年第4期419-426,共8页
利用振动声强及能量可视化技术研究板结构中振动波传递及分布特性。首先介绍了结构振动声强分量的计算和流线可视化的相关理论以及振动能量流的计算公式;基于MATLAB与APDL语言编写了集成可视化计算程序,并介绍了程序实现流程。在数值计... 利用振动声强及能量可视化技术研究板结构中振动波传递及分布特性。首先介绍了结构振动声强分量的计算和流线可视化的相关理论以及振动能量流的计算公式;基于MATLAB与APDL语言编写了集成可视化计算程序,并介绍了程序实现流程。在数值计算中,先验证了可视化程序的有效性;以L形耦合板为例,实现振动波能量传递和分布的可视化,证明了计算程序的实用性和创新性;同时初步讨论了不同激励频率对能量传递及分布的影响,得到了一些有益的结论。振动波传递和分布可视化技术为进行合理优化的振动噪声控制提供了科学的依据。 展开更多
关键词 振动 振动声强 可视化技术 能量分布 流线
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Structural Intensity Characterization of Composite Laminates Subjected to Impact Load 被引量:4
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作者 王东方 贺鹏飞 刘子顺 《Journal of Shanghai Jiaotong university(Science)》 EI 2008年第3期375-380,共6页
Structural intensity (SI) characterization of composite laminates subjected to impact load was dis-cussed. The SI pattern of the laminates which have different fiber orientations and boundary conditions was analyzed. ... Structural intensity (SI) characterization of composite laminates subjected to impact load was dis-cussed. The SI pattern of the laminates which have different fiber orientations and boundary conditions was analyzed. The resultant forces and velocities of the laminates were calculated, and the structural intensity was evaluated. The SI streamlines of carbon fiber reinforced epoxy composite laminates and the steel plates were discussed. The results show that the SI streamlines of the graphite/epoxy laminates are different from that of the steel plates, and the SI streamlines are influenced by the boundaries, the stacking sequence of the composite laminates. The change of the historical central displacement of the graphite/epoxy laminates is fasten than that of the steel plates. 展开更多
关键词 structural intensity structural noise vibration control power flow
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Atomic resolution scanning tunneling microscope imaging up to 27 T in a water-cooled magnet 被引量:2
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作者 Wenjie Meng Ying Guo +1 位作者 Yubin Hou Qingyou Lu 《Nano Research》 SCIE EI CAS CSCD 2015年第12期3898-3904,共7页
We report the first atomically resolved scanning tunneling microscope (STM) imaging in a water-cooled magnet (WM), for which extremely harsh vibrations and noise have been the major challenge. This custom WM-STM f... We report the first atomically resolved scanning tunneling microscope (STM) imaging in a water-cooled magnet (WM), for which extremely harsh vibrations and noise have been the major challenge. This custom WM-STM features an ultra-rigid and compact scan head in which the coarse approach is driven by our newly designed TunaDrive piezoelectric motor. A three-level spring hanging system is used for vibration isolation. Room-temperature raw-data images of graphite with quality atomic resolution were acquired in the presence of very strong magnetic fields, with a field strength up to 27 T, in a 32-mm-diameter bore WM with a maximum field strength of 27.5 T at a power rating of 10 MW, calibrated by nuclear magnetic resonance (NMR). This record field strength of 27 T exceeds the maximal field strength achieved by the conventional supercon- ducting magnets. Besides, our WM-STM has paved the way to STM imaging using a 45 T, 32-mm-diameter bore hybrid magnet, which is the world's flagship magnet, producing the strongest steady magnetic field. 展开更多
关键词 scanning tunnelingmicroscopy water-cooled magnet strong magnetic field TunaDriver piezoelectricmotor highly oriented pyrolyticgraphite
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