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轻钢屋面系统中冷弯薄壁型钢檩条承载性能研究现状 被引量:6
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作者 栾蔚 李元齐 《建筑钢结构进展》 CSCD 北大核心 2017年第4期10-19,52,共11页
开口截面冷弯薄壁型钢檩条是连接轻钢屋面和钢屋架或屋面梁的重要构件,受力及支撑情况复杂。合理考虑轻钢屋面系统提供的侧移和扭转约束是保证其安全性和经济性的关键所在。全面综述了国内外学者针对重力荷载和风吸力作用下3类典型轻钢... 开口截面冷弯薄壁型钢檩条是连接轻钢屋面和钢屋架或屋面梁的重要构件,受力及支撑情况复杂。合理考虑轻钢屋面系统提供的侧移和扭转约束是保证其安全性和经济性的关键所在。全面综述了国内外学者针对重力荷载和风吸力作用下3类典型轻钢屋面系统中冷弯薄壁型钢檩条承载性能的研究成果,重点分析了屋面系统扭转刚度量化、拉条的约束作用以及常用试验加载方法等关键问题,为冷弯薄壁型钢檩条精细化设计理论研究和相关规范编制提供参考。 展开更多
关键词 轻钢屋面系统 冷弯薄壁型钢檩条 侧移约束 扭转约束 精细化设计
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Vibration-Driven Microrobot Positioning Methodologies for Nonholonomic Constraint Compensation
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作者 Kostas Vlachos Dimitris Papadimitriou Evangelos Papadopoulos 《Engineering》 SCIE EI 2015年第1期66-72,共7页
This paper presents the formulation and practical implementation of positioning methodologies that compensate for the nonholonomic constraints of a mobile microrobot that is driven by two vibrating direct current(DC) ... This paper presents the formulation and practical implementation of positioning methodologies that compensate for the nonholonomic constraints of a mobile microrobot that is driven by two vibrating direct current(DC) micromotors. The open-loop and closed-loop approaches described here add the capability for net sidewise displacements of the microrobotic platform. A displacement is achieved by the execution of a number of repeating steps that depend on the desired displacement, the speed of the micromotors, and the elapsed time. Simulation and experimental results verified the performance of the proposed methodologies. 展开更多
关键词 MICROROBOTICS vibration micromotor actuationnonholonomic planning nonholonomic constraints compen-sation
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