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optimum geometry of tuned liquid column-gas damper for control of offshore jacket platform vibrations under seismic excitation

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Earthquake Engineering and Engineering Vibration 2012年第4期11卷 579-592页

作者： Seyed Amin Mousavi Seyed Mehdi Zahrai Khosrow Bargi R & D Department Sabok Sazane Sarie Engineering Company Center of Excellence for Engineering and Management of Civil Infrastructures School of Civil Engineering Pardis College of EngineeringThe University of TehranIran

In this study, the effectiveness of a tuned liquid column-gas damper, TLCGD, on *** of seismic-induced vibrations of steel jacket platforms is evaluated. TLCGD is an interesting choice in the case of jacket platforms because it is possible to use the structural elements as the horizontal column of the TLCGD. The objective here is to find the optimum geometric parameters, namely orientation and configuration of vertical columns, length ratio, and area ratio of the TLCGD, considering nonlinear damping of the TLCGD and water-structure interaction between the jacket platform and sea water. The effects of different characteristics of ground motion such as PGA and frequency content on the optimum geometry are also investigated and it is observed that these features have some influence on the optimum area ratio. Finally it is observed that pulse arrangement of ground acceleration is one of the most important parameters affecting the efficiency of a TLCGD. In other words, it is found that the TLCGD＇s capability to reduce the RMS responses depends only on the frequency content of the ground acceleration, but its capability to reduce the maximum responses depends on both the frequency content and the pulse arrangement of the ground acceleration.

关键词： passive control tuned liquid column damper TLCGD offshore platform optimum geometry

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optimum geometry Selection in Mobile Sensor Networks

Optimum Geometry Selection in Mobile Sensor Networks

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2006 10th International Conference on Communication Technology（ICCT 2006）

作者： Wei-Wei Ji and Zhong Liu Department of Electronic Engineering Nanjing University of Science & Technology Nanjing The People’s Republic of China

In this paper, the optimum geometry selection of mobile sensor networks （MSN） based on receiving signal energy is derived. For illustration purpose, the performance of acoustic sensor network in the form of optimum geometry distribution is investigated and compared with that of random distributed sensor network. The simulation results show that the sensor network in the form of optimum geometry performs much better than in random distributed condition, and it is in good agreement with the theoretical results.

关键词： optimum geometry mobile sensor networks (MSN) energy

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