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Summary on Vibration Control of Periodic Structure
CHEN Bin;HUANG Xiu-chang
   2011, 31 (5): 37-41.   DOI: 10.3969/j.issn.1006-1355-2011.05.009
Abstract （1907）            Save
A detailed literature review on vibration of periodic structure is given, in both aspects of research objects and modeling approaches. The researches on periodically supported structure, periodic ribbed plate and shell, periodic truss, periodic chiral lattice, phononic crystal, disordered periodic structure, metamaterials are addressed. Methods for solving the band gaps and dynamic responses of periodic structure are summarized.
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ummary on Vibro-acoustic Modeling of Complex Underwater Cylindrical Shell Structure
HOU Lei;HUANG Xiu-chang;XU Shi-yin
   2011, 31 (5): 32-36.   DOI: 10.3969/j.issn.1006-1355-2011.05.008
Abstract （1766）            Save
A detailed literature review on vibro-acoustic modeling of complex underwater cylindrical shell structure is given, in both aspects of research objects and modeling approaches. Reviews on infinitely long and finitely cylindrical shell, double layer cylindrical shell, ribbed cylindrical shell, and the cylindrical shell with internal bases (floors, foundations etc) and complex vibration isolation system are presented. Methods for modeling dynamic responses of fluid-loaded cylindrical shell in low frequency, mid-frequency and high frequency ranges are given. Some potential modeling techniques are provided.
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Generalized conforming shell element for analysis of free vibration of shell structures
QIAN Zhen-hua;HUANG Xiu-chang;HUA Hong-xing
   2011, 31 (1): 9-14.  
Abstract （1229）            Save
A flat 4-node shell element is developed by using the analytical trial function based membrane and plate generalized conforming element. The element has 24 degrees of freedom and has been used for analysis of cylindrical structures. The element is easy for programming and it has high accuracy which is proved by numerical tests.
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《Influence of Mechanical Filter with Periodic Structure on Vibration Transmission Properties of Raft Isolation System》
HUANG Xiu-chang;FENG Guo-ping;ZHANG Zhi-yi;HUA Hong-Xing
   2010, 30 (2): 9-12.   DOI: 10.3969/j.issn.1006-1355.2010.02.009
Abstract （2299）      PDF（pc） （1284KB）（1895）       Save
A medium with periodic heterogeneity has special frequency ranges in which waves may be either effectively attenuated or allowed to propagate in space. These frequency ranges are referred to as stop bands (or band gaps) and pass bands (or bands). Such unique characteristics can be employed to design a kind of virtual mechanical filters with periodic structures. The mechanical filter can be inserted between the lower isolator and the base of the raft isolation system to alter the transmission properties from the machine to the base, so that the frequency of the raft isolation system can approach its excitation frequency, and differ from the shells intrinsic frequency and excitation frequency of the cabin. The transmission matrix method is used to analyze the transmission property and the dynamic response of the raft system. Result shows that the responses of displacement, force and power flow of the base can be greatly reduced when the excitation frequency is within the stop bend of the periodic structure.
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《Analysis of Transmission Paths of Ship Stern VibrationBased on Power Flow Theory》
FENG Guo-ping;HUANG Xiu-chang;LIU Xing-tian;ZHANG Zhi-yi;HUA Hong-xing
   2010, 30 (2): 5-8.   DOI: 10.3969/j.issn.1006-1355.2010.02.005
Abstract （2673）      PDF（pc） （1274KB）（1885）       Save
Vibration of ship sterns is a key point in ship vibration control. Study of the characteristic of vibration transmission paths of ship stern will be helpful for vibration reduction of the ship stern. Based on the modal shape analysis methods and power flow theory, the transmission path of the stern system vibration is deducted and analyzed numerically. The results show that the stern bearing is the main path for lower frequency vibration, while the thrust bearing base is the main path for medium frequency vibration.
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