Extensive 3-D model tests have been performed to study the effects of wave obliquity and multi-directionality on the wave loads acting on vertical breakwaters. The variation of horizontal and uplift forces acting on a...Extensive 3-D model tests have been performed to study the effects of wave obliquity and multi-directionality on the wave loads acting on vertical breakwaters. The variation of horizontal and uplift forces acting on an unit length of a breakwater with wave direction, the longitudinal distribution of wave forces, as well as the longitudinal load reduction are analyzed. Some empirical formulae of the longitudinal distribution coefficient and the longitudinal load reduction factor are presented for practical use.展开更多
With technological advancements,consumer demands for textile functionality and intelligence have increased substantially.Next-generation E-textiles should enable multidirectional force sensing while ensuring high leve...With technological advancements,consumer demands for textile functionality and intelligence have increased substantially.Next-generation E-textiles should enable multidirectional force sensing while ensuring high levels of wearer comfort.However,existing electronic textiles are insufficient to simultaneously monitor the direction and degree of strain,and sweat accumulation can lead to poor comfort.Here,inspired by the asymmetric gradient structure of human skin,Janus double-layer woven electronic textile(JDET)was designed.Through material-structure-function biomimetic design,bidirectional bending recognition and moisture management function are integrated into the device.A high-sensitivity strain sensing unit(GF=1402.94)was constructed using a single wrapped yarn and conductive materials.Combined with a double-layer fabric structure design,a plain weave layer woven with hydrophilic sensing yarn and a twill weave layer woven with hydrophobic polyester yarn formed a dual gradient structure of fabric wettability and porosity,resulting in excellent unidirectional moisture transport capability.The asymmetric design of the sensing layer enables JDET to selectively identify bending directions(-180°-180°),and has good stability(>8000 s)in bending cycle testing.In addition,JDET has been successfully applied to human motion monitoring and Morse code interaction systems.This asymmetric gradient structure design of textiles provides ideas for the design of the next generation of intelligent electronic textiles.展开更多
针对现有人机交互系统中的力觉交互沉浸感不足的问题,提出了一种基于分布式系统的动态碰撞检测与虚拟力觉交互的控制策略。力觉交互系统采用分布式设计,主要包括:人机交互接口管理、空间位形解算和运动控制与碰撞检测等单元设计。在交...针对现有人机交互系统中的力觉交互沉浸感不足的问题,提出了一种基于分布式系统的动态碰撞检测与虚拟力觉交互的控制策略。力觉交互系统采用分布式设计,主要包括:人机交互接口管理、空间位形解算和运动控制与碰撞检测等单元设计。在交互过程中,采用分层方式处理碰撞效果。根据模型所处虚拟空间的相对几何位置与碰撞后的运动状态构建虚拟力觉,并由交互管理单元映射至实体交互设备,实现操作者的力觉感知与交互。采用PHANTOM omni力反馈设备与Visual Studio 2010构建了动态碰撞检测的仿真实验系统,并进行了虚拟力觉交互实验。实验结果表明:操作者通过力反馈设备能够实现力觉感知与交互,有效解决了交互过程中的力觉效果不足的问题。展开更多
文摘Extensive 3-D model tests have been performed to study the effects of wave obliquity and multi-directionality on the wave loads acting on vertical breakwaters. The variation of horizontal and uplift forces acting on an unit length of a breakwater with wave direction, the longitudinal distribution of wave forces, as well as the longitudinal load reduction are analyzed. Some empirical formulae of the longitudinal distribution coefficient and the longitudinal load reduction factor are presented for practical use.
基金supported by the National Natural Science Foundation of China(No.Grant52173218)the Natural Science Foundation Project of Shanghai“science and technology innovation action plan”(Nos.22ZR1400500 and 20ZR1400200)+1 种基金the Key Research and Development Program of the Science and Technology Bureau of Ningbo City(Grant No.2023Z082)supported by“the Fundamental Research Funds for the Central Universities”(CUSF-DH-T-2024043).
文摘With technological advancements,consumer demands for textile functionality and intelligence have increased substantially.Next-generation E-textiles should enable multidirectional force sensing while ensuring high levels of wearer comfort.However,existing electronic textiles are insufficient to simultaneously monitor the direction and degree of strain,and sweat accumulation can lead to poor comfort.Here,inspired by the asymmetric gradient structure of human skin,Janus double-layer woven electronic textile(JDET)was designed.Through material-structure-function biomimetic design,bidirectional bending recognition and moisture management function are integrated into the device.A high-sensitivity strain sensing unit(GF=1402.94)was constructed using a single wrapped yarn and conductive materials.Combined with a double-layer fabric structure design,a plain weave layer woven with hydrophilic sensing yarn and a twill weave layer woven with hydrophobic polyester yarn formed a dual gradient structure of fabric wettability and porosity,resulting in excellent unidirectional moisture transport capability.The asymmetric design of the sensing layer enables JDET to selectively identify bending directions(-180°-180°),and has good stability(>8000 s)in bending cycle testing.In addition,JDET has been successfully applied to human motion monitoring and Morse code interaction systems.This asymmetric gradient structure design of textiles provides ideas for the design of the next generation of intelligent electronic textiles.
文摘针对现有人机交互系统中的力觉交互沉浸感不足的问题,提出了一种基于分布式系统的动态碰撞检测与虚拟力觉交互的控制策略。力觉交互系统采用分布式设计,主要包括:人机交互接口管理、空间位形解算和运动控制与碰撞检测等单元设计。在交互过程中,采用分层方式处理碰撞效果。根据模型所处虚拟空间的相对几何位置与碰撞后的运动状态构建虚拟力觉,并由交互管理单元映射至实体交互设备,实现操作者的力觉感知与交互。采用PHANTOM omni力反馈设备与Visual Studio 2010构建了动态碰撞检测的仿真实验系统,并进行了虚拟力觉交互实验。实验结果表明:操作者通过力反馈设备能够实现力觉感知与交互,有效解决了交互过程中的力觉效果不足的问题。
