检索结果-南通市图书馆

Equivalent series system to model a multiple friction pendulum system with numerous sliding interfaces for seismic analyses

引用

Earthquake Engineering and Engineering Vibration 2014年第1期13卷 85-99页

作者： c.S.Tsai H.c.su T.c.chiang Department of civil Engineering Feng Chia University Department of Water Resources Engineering and conservation Feng Chia University Earthquake Proof Systems Inc.

current structural analysis software programs offer few if any applicable device-specifi c hysteresis rules or nonlinear elements to simulate the precise mechanical behavior of a multiple friction pendulum system(MFPS) with numerous sliding *** on the concept of subsystems,an equivalent series system that adopts existing nonlinear elements with parameters systematically calculated and mathematically proven through rigorous derivations is *** aim is to simulate the characteristics of sliding motions for an MFPS isolation system with numerous concave sliding interfaces without prior knowledge of detailed information on the mobilized forces at various sliding *** MFPS with numerous concave sliding interfaces and one articulated or rigid slider located between these interfaces is divided into two subsystems: the fi rst represents the concave sliding interfaces above the slider,and the second represents those below the *** equivalent series system for the entire system is then obtained by connecting those for each subsystem in *** equivalent series system is validated by comparing numerical results for an MFPS with four sliding interfaces obtained from the proposed method with those from a previous study by Fenz and ***,these numerical results demonstrate that an MFPS isolator with numerous concave sliding interfaces,which may have any number of sliding interfaces,is a good isolation device to protect structures from earthquake damage through appropriate designs with controllable mechanisms.

关键词： seismic isolation base isolation earthquake engineering multiple friction pendulum system structural control mathematical modeling equivalent series system

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Roles of soil-structure interaction and damping in base-isolated structures built on numerous soil layers overlying a half-space

引用

Earthquake Engineering and Engineering Vibration 2016年第2期15卷 387-400页

作者： c.S.Tsai c.I.Hsueh H.c.su Department of civil Engineering Feng Chia University Graduate Institute of civil & Hydraulic Engineering Feng Chia University Department of Water Resources Engineering and conservation Feng Chia University

This study examines the roles of soil-structure interaction （SSI）, higher modes, and damping in a base-isolated structure built on multiple layers of soil overlying a half space. closed-form solutions for the entire system, including a superstructure, seismic isolator, and numerous soil layers overlying a half-space, were obtained. The formulations obtained in this study simply in terms of well-known frequencies and mechanical impedance ratios can explicitly interpret the dynamic behavior of a base-isolated structure interacting with multiple soil layers overlying a half-space. The key factors influencing the performance of the isolation system are the damping ratio of the isolator and the ratio of the natural frequency of the fixed-base structure to that of the isolated structure by assuming that the superstructure moves as a rigid body. This study reveals that higher damping in the base isolator is unfavorable to higher mode responses that usually dominate the responses of the superstructure and that the damping mechanism plays an important role in transmitting energy in addition to absorbing energy. It is also concluded that it is possible to design a soft soil layer as an isolation system for isolating vibration energy.

关键词： base isolation seismic isolation soil-structure interaction closed- form solution higher-mode effects soilstratum passive control damping effects

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Two limit theorems for NA random variables

引用

chinese Science Bulletin 1997年第5期42卷 356-359页

作者： su, c Qin, YS Depatment of Statistics and Finance University of Science and Technology of China Hefei China

THE NA （negatively associated） random variables are of considerable uses in system reliability and multivariate statistical analysis. Many authors have studied the limit properties for them. Definition 1. Random variables Xsub>1sub>,…,Xsub>nsub>（n≥2） are called NA if for every two distinct nonempty subsets Tsub>1sub> and Tsub>2sub> of {1,…,n} and every pair of coordinatewise nondecreasing （or nonincreasing） functions fsub>1sub> and fsub>2sub>, there

关键词： NA random variables strong convergence complete convergence.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Design of double negativity elastic metamaterial

引用

International Journal of Smart and Nano Materials 2015年第1期6卷 61-72页

作者： Y.c.su c.T.sun School of Aeronautics and Astronautics Purdue UniversityWest Lafay

A metamaterial model that possesses simultaneously negative effective mass density and negative effective Young’s modulus is proposed in this *** curves and dynamic responses of the model are *** the double negative frequency region,it is demonstrated that the phase velocity is *** addition,it was found that the band gap region of the metamaterial can be predicted accurately by taking parts of single-unit cell to analyze the steady-state *** design is also fabricated by a 3D printer.

关键词： acoustic metamaterial double negativity local resonance negative mass negative modulus

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tri-directional shaking table tests of vibration sensitive equipment with static dynamics interchangeable-ball pendulum system

引用

Earthquake Engineering and Engineering Vibration 2010年第1期9卷 103-112页

作者： c.S. Tsai Yung-chang Lin Wen-Shin chen H.c. su D G epartment of civil Engineering Feng Chia University Taichung Chinese Taipei Graduate Institute of civil and Hydraulic Engineering Feng Chia University Taichung Chinese Taipei Department of Water Resources Engineering and conservation Feng Chia University Taichung Chinese Taipei

Recently, the high-tech industry has become a key industry for economic development in many countries. However, vibration sensitive equipment located in these industrial buildings is vulnerable during earthquakes, which may cause huge economic loss. In this study, an innovative isolator for safeguarding the vibration sensitive equipment, namely, the static dynamics interchangeable^all pendulum system （SDI-BPS） is proposed and investigated to examine its protective capability for the vibration sensitive equipment during earthquakes through a series of tri-directional shaking table tests. The experimental results illustrate that the SDI-BPS isolator can provide significant damping to rolling types of base isolation systems for reducing the bearing displacement and size, and avoid the stress concentration, which can cause damage or scratches on the rolling surface of the isolator, to prolong its life span of service. The SDI-BPS isolator also provides excellent capability in protecting the vibration sensitive equipment and exhibits a stable behavior under long terms of service loadings and earthquakes.

关键词： ball pendulum system critical equipment base isolation vibration sensitive equipment base isolator passive control earthquake engineering structural control

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Mathematical modeling and full-scale shaking table tests for multi-curve buckling restrained braces

引用

Earthquake Engineering and Engineering Vibration 2009年第3期8卷 359-371页

作者： c. S. Tsai Yungchang Lin Wenshin chen H. c. su Department of civil Engineering Feng Chia University Taichung Chinese Taipei Graduate Institute of civil and Hydraulic Engineering Feng Chia University Taichung Chinese Taipei Department of Water Resources Engineering and conservation Feng Chia University Taichung Chinese Taipei

Buckling restrained braces （BRBs） have been widely applied in seismic mitigation since they were introduced in the 1970s. However, traditional BRBs have several disadvantages caused by using a steel tube to envelope the mortar to prevent the core plate from buckling, such as： complex interfaces between the materials used, uncertain precision, and time consumption during the manufacturing processes. In this study, a new device called the multi-curve buckling restrained brace （Mc-BRB） is proposed to overcome these disadvantages. The new device consists of a core plate with multiple neck portions assembled to form multiple energy dissipation segments, and the enlarged segment, lateral support elements and constraining elements to prevent the BRB from buckling. The enlarged segment located in the middle of the core plate can be welded to the lateral support and constraining elements to increase buckling resistance and to prevent them from sliding during earthquakes. component tests and a series of shaking table tests on a full-scale steel structure equipped with Mc-BRBs were carried out to investigate the behavior and capability of this new BRB design for seismic mitigation. The experimental results illustrate that the Mc-BRB possesses a stable mechanical behavior under cyclic loadings and provides good protection to structures during earthquakes. Also, a mathematical model has been developed to simulate the mechanical characteristics of BRBs.

关键词： buckling restrained brace energy absorption passive control earthquake energy plasticity model structural control multi-curve BRB

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Numerical modelling of non-ideal detonation in ANFO explosives applying Wood-Kirkwood theory coupled with EXPLO5 thermochemical code

引用

Defence Technology（防务技术） 2021年第5期17卷 1740-1752页

作者： Barbara Stimac Vinko Skrlec Mario Dobrilovic Muhamed suceska Faculty of Mining Geology and Petroleum EngineeringUniversity of ZagrebPierottijeva 610000ZagrebCroatia

Ammonium nitrate and fuel oil(ANFO)based explosive is a classic example of non-ideal high *** detonation is characterized by a strong dependence of detonation parameters on explosive charge diameter,presence and characteristics of confinement,as well as incomplete consumption of explosive at the sonic *** this work we propose a detonation model based on the Wood-Kirkwood(WK)theory coupled with the thermochemical code EXPLO5 and supplemented with reaction rate *** objective is to analyze the validity of the model for highly non-ideal ANFO explosives,with emphasis on effect of reaction rate *** was found that both single-step and two-step pressure-based models can be calibrated to reproduce experimental detonation velocity-charge radius data of ANFO at radii significantly above the failure radius(*** D/D_(id)>~0.6).Single-step pressure-based model,with the pressure exponent equal to 1.4,proved to be the most accurate,even in the vicinity of the failure *** impact of the rate models is most evident on temporal(and spatial)distribution of flow parameters in detonation driving zone,especially when it comes to the conversion and width of detonation driving zone.

关键词： ANFO Non-ideal detonation Reaction rate model Numerical modelling EXPLO5

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

圆柱容器液体晃动问题的数值计算

引用

空气动力学学报 1991年第1期9卷 112-119页

作者：王永学 T.c.su 大连理工大学美国佛罗里达大西洋大学

本文将二维VOF方法推广到三维情形,研究了圆柱容器遭受水平强迫振荡时的液体晃动问题。在数值模型中,采用了改进的施主与受主单元体方法计算流体在单元体之间的交换。同时对处理任意容器边界的部分单元体方法进行了改进,使之满足边界面... 详细信息

本文将二维VOF方法推广到三维情形,研究了圆柱容器遭受水平强迫振荡时的液体晃动问题。在数值模型中,采用了改进的施主与受主单元体方法计算流体在单元体之间的交换。同时对处理任意容器边界的部分单元体方法进行了改进,使之满足边界面上的速度边界条件。应用改进后的VOF方法得到的结果与试验结果符合较好,能够成功地数模出由于动力不稳定性引起的圆柱容器遭受纵向水平振荡时液体表面的旋转运动响应。

关键词：圆柱容器液体晃动 VOF方法

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A 2.4-GHz Low-Power Single-chip Tunable cMOS Low-IF ISM Receiver

A 2.4-GHz Low-Power Single-Chip Tunable CMOS Low-IF ISM Rece...

引用

2006 8th International conference on Solid-State and Integrated circuit Technology

作者： chia-Pei chen H-S Kao c-c su Simon c.Li Institute of Electronics National Chiao-Tung University

ISBN: (纸本)1424401607

＜正＞A low power single-chip cMOS single-conversion tunable low-IF receiver operated in the 2.4-GHz ISM band is *** on-chip tunable components in low power LNA and Lc-tank VcO circuit, the receiver measures a RF gain of 35dB at 2.4-GHz, sensitivity of-87 dBm at 0.1%BER,IIP3 of-10 dBm, and NF of 4.9 dB with current consumption of 3 lmA and a chip area of 2850μm×2850μm.

关键词： Receivers LOW POWER electricity consumption ISM band complementary Metal Oxide Semiconductor

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

The Massive Black Hole at the center of NGc 4151

引用

天文研究与技术 1999年第S1期 309-311页

作者： su c.Y. ( Department of Mathematics & Physics, Guangdong Industry University, Guangzhou 510643, china ) $$$$

In this paper we adopt the theory of Shields and Wheeler (1976) to explain the long-term period and use the Shields and Wheeler’s storage model to calculate the mass of the center black hole for NGc 4151, which shows a period of 14. years (Fan & su 1998). The mass of the center black hole that the new method gets,～10 6M ⊙,is consistent with other authors. We find the energy of the stable phase, which utilize the period of 14. years to calculate, is closed equal to the burst energy. Other period variation mechanisms have been discussed.

关键词： Mass Black hole variability Seyfert Galaxy (NGc 4151)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：