Optimal arrangement of viscoelastic dampers for seismic control of adjacent shear-type structures   总被引：1，自引：0，他引：1  

Xiao HUANG  Hong-ping ZHU 《浙江大学学报(A卷英文版)》2013,14(1):47-60

The optimal arrangement of viscoelastic dampers (VEDs) used to link two adjacent shear-type structures under seismic excitation was investigated. A two-step optimal design method is proposed. First, optimal parameter expressions of the Kelvin model are used to calculate the optimal stiffness and damping coefficient of the VEDs. Then, using the two-step optimal design method, taking the quadratic performance index as the optimization objective, the optimal arrangement of the dampers is determined. General rules about the optimal arrangement of the VEDs were obtained. The results show that the placement of only one damper between two adjacent shear-type structures should be avoided; if more than one damper is used, they should be distributed on the top and lower floors of the structures. Optimization of the number of dampers had little effect on response reduction. The most important factor was the optimization of the placement of the dampers. Through comparative study, for buildings of equal and unequal heights, the optimal parameters of dampers from parametric studies were shown to match the theoretical results for different numbers and placements of dampers. The level of response reduction was shown to be sensitive to the damping coefficient of the dampers.  相似文献   

Academic and Professional Publishing as Seen from the United Kingdom     

《资料收集管理》2013,38(1-2):113-115

No abstract available for this article.  相似文献   

Temporal patterning of competitive emotions: A critical review     

Ester Cerin  Attila Szabo  Nigel Hunt  Clive Williams 《Journal of sports sciences》2013,31(8):605-626

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The Interaction of Functional and Dysfunctional Emotions During Balance Beam Performance     

Jorge Cottyn  Dirk De Clercq  Geert Crombez  Matthieu Lenoir 《Research quarterly for exercise and sport》2013,84(2):300-307

The interaction between functional and dysfunctional emotions, as one of the major tenets of the Individual Zones of Optimal Functioning (IZOF) model (Hanin, 2000), was studied in a sport specific setting. Fourteen female gymnasts performed three attempts of a compulsory balance beam routine at three different heights. Heart rate and self-report of functional and dysfunctional emotions were measured during each routine. These data revealed the effectiveness of inducting emotions by manipulating height. Also, performance decreased on the most challenging condition, (i.e., the first attempt on the highest height). Moderated hierarchical regression analysis revealed a significant interaction between functional and dysfunctional emotions only when the dysfunctional emotion level was low.  相似文献   

Exercise science and health-enhancing physical activity     

Andy Smith 《Journal of sports sciences》2013,31(8):677-678

Although technology has now infiltrated and prompted evolution in most mass participation sports, the advances in bat technology in such sports as baseball and cricket have been relatively minor. In this study, we used a simple finite element modelling approach to try to shed new light upon the underlying mechanics of the bat-ball impact, with a view to the future optimization of bat design. The analysis of a flexible bat showed that the point of impact that produced the maximum post-impact ball velocity was a function of the bat's vibrational properties and was not necessarily at the centre of percussion. The details of the analysis agreed well with traditional Hertzian impact theory, and broadly with empirical data. An inspection of the relative modal contributions to the deformations during impact also showed that the position of the node of the first flexure mode was important. In conclusion, considerable importance should be attached to the bat's vibrational properties in future design and analysis.  相似文献   

Hierarchical confirmatory factor analysis of the Flow State Scale in exercise     

Symeon P. Vlachopoulos  Costas I. Karageorghis  Peter C. Terry 《Journal of sports sciences》2013,31(10):815-823

In this study, we examined the factor structure and internal consistency of the Flow State Scale using responses of exercise participants.This self-report questionnaire consists of nine subscales designed to assess flow in sport and physical activity. It was administered to 1231 aerobic dance exercise participants. Confirmatory factor analyses were used to test three competing measurement models of the flow construct: a single-factor model, a nine-factor model and a hierarchical model positing a higher-order flow factor to explain the intercorrelations between the nine first-order factors. The single-factor model showed a poor fit to the data. The nine-factor model and the hierarchical model did not show an adequate fit to the data. All subscales of the Flow State Scale displayed acceptable internal consistency ( f > 0.70), with the exception of transformation of time ( f = 0.65). Collectively, the present results do not provide support for the tenability of the single-factor, nine-factor or hierarchical measurement models in an exercise setting.  相似文献   

矩阵方程AXA~T+BYB~T=C的对称最小二乘解     

王伟  刘莉 《宁夏师范学院学报》2012,33(3):9-14

建立了一种求矩阵方程AXAT＋BYBT=C对称最小二乘解的递推算法,对任意的初始对称矩阵,经过有限步迭代得到它的对称最小二乘解.若选取特殊的初始矩阵,通过递推算法得到的解就是极小范数对称最小二乘解.而且,对给定的任意矩阵,通过对方程的变形能得到它的最佳逼近对称解.  相似文献   

浙江省高校图书馆人员编制的现状分析与定编思路   总被引：21，自引：0，他引：21  

高跃新  王增清  徐永明 《大学图书馆学报》2005,23(2):42-46

通过对浙江省高等院校图书馆现状的分析,寻找高校图书馆人员编制的各种依据,提出解决高校图书馆人员定编的方法。  相似文献   

基于熵的项目组合配置协同度研究     

白礼彪  白思俊  Victor Shi 《科技管理研究》2017,(7)

以熵为理论出发点,在定义正协同、负协同、模糊协同和协同度等概念的基础上,提出定量描述项目级、工序级配置组件协同关系矩阵,设计以阶段协同熵加权反映配置组件模糊协同关系、以组件内外协同关系之和度量项目组合配置组件协同度的分析方法,构建基于熵的项目组合配置协同度决策模型,并通过企业实践对模型的可操作性进行验证。  相似文献   

基于无功补偿优化算法的农村中压配电网研究     

汪宏武  王航宇 《科技广场》2008,(3):218-220

针对农村中压配电网无功损失较为严重的现象,研究了农村中压电网无功补偿优化问题,寻找满足电压质量要求和线损最小条件下农村中压电网无功补偿装置的最佳安装位置和最佳补偿容量。在研究农村中压电网结构特点的基础上,提出了简便、有效的优化算法。算法以无功补偿的最佳位置和最佳容量为目标,考虑了网损最小、电压质量和综合经济性等多目标优化约束条件。  相似文献