A physical-based particle system is employed for cloth modeling supported by two basic algorithms, between which one is the construction of the internal and external forces acting on the particle system in terms of KE...A physical-based particle system is employed for cloth modeling supported by two basic algorithms, between which one is the construction of the internal and external forces acting on the particle system in terms of KES-F bending and shearing tests, and the other is the collision algorithm of which the collision detection is carried by means of bi-section of time step and the collision response is handled according to the empirical law for frictionless collision With these algorithms. the geometric state of parcles can be expressed as ordinary differential equationswhich is numerically solved by fourth order Runge- Kutta integration. Different draping figures of cotton fabric and wool fabric prove that such a particle system is suitable for 3D cloth modeling and simulation.展开更多
在“三跨”输电线路张力放线施工中,一旦发生事故被牵导线可能跌落冲击下方跨越网,威胁被跨越物的安全稳定运行,因此提出一种基于激光点云与建筑信息模型(building information modeling,BIM)技术的“三跨”施工跨越网动力学响应分析方...在“三跨”输电线路张力放线施工中,一旦发生事故被牵导线可能跌落冲击下方跨越网,威胁被跨越物的安全稳定运行,因此提出一种基于激光点云与建筑信息模型(building information modeling,BIM)技术的“三跨”施工跨越网动力学响应分析方法。首先利用机载激光雷达采集“三跨”施工现场的三维点云数据,使用改进的布料模拟滤波算法分割得到跨越地形点云数据,使用基于点云空间维度特征与K-Means算法实现对跨越档两侧杆塔点云数据的高精度提取;其次根据提取的点云数据结合BIM技术对目标设备及施工环境进行逆向建模,通过不同地表物体的组装堆砌,并在其上搭建施工跨越网模型;最后通过模拟事故发生时导线对跨越网的冲击碰撞,探测跨越网的承载性能及其与被跨越物之间的动态净空距离。结果表明,该方法能够提前在实际施工环境中对跨越网的动力学性能进行分析,为输电线路跨越施工提供可靠的安全保障及数据支撑,具有一定的工程价值。展开更多
文摘A physical-based particle system is employed for cloth modeling supported by two basic algorithms, between which one is the construction of the internal and external forces acting on the particle system in terms of KES-F bending and shearing tests, and the other is the collision algorithm of which the collision detection is carried by means of bi-section of time step and the collision response is handled according to the empirical law for frictionless collision With these algorithms. the geometric state of parcles can be expressed as ordinary differential equationswhich is numerically solved by fourth order Runge- Kutta integration. Different draping figures of cotton fabric and wool fabric prove that such a particle system is suitable for 3D cloth modeling and simulation.
文摘在“三跨”输电线路张力放线施工中,一旦发生事故被牵导线可能跌落冲击下方跨越网,威胁被跨越物的安全稳定运行,因此提出一种基于激光点云与建筑信息模型(building information modeling,BIM)技术的“三跨”施工跨越网动力学响应分析方法。首先利用机载激光雷达采集“三跨”施工现场的三维点云数据,使用改进的布料模拟滤波算法分割得到跨越地形点云数据,使用基于点云空间维度特征与K-Means算法实现对跨越档两侧杆塔点云数据的高精度提取;其次根据提取的点云数据结合BIM技术对目标设备及施工环境进行逆向建模,通过不同地表物体的组装堆砌,并在其上搭建施工跨越网模型;最后通过模拟事故发生时导线对跨越网的冲击碰撞,探测跨越网的承载性能及其与被跨越物之间的动态净空距离。结果表明,该方法能够提前在实际施工环境中对跨越网的动力学性能进行分析,为输电线路跨越施工提供可靠的安全保障及数据支撑,具有一定的工程价值。
