基于PhysX的冶金机械演示系统设计

PhysX是NVIDIA(英伟达)公司推出的一款功能强大的物理效果计算引擎,它可以通过计算机上的NVIDIA图形卡的GPU实现高速的硬件物理效果加速计算,比传统的通过CPU计算效率高出很多,可以轻松实现复杂的大量的粒子碰撞效果。在国内,冶金机械设备种类很多,但这类设备通常体积庞大,这给产品的宣传和功能演示造成很大困难。本文将这些庞大、复杂的设备用三维软件,并通过PhysX物理计算引擎,进行虚拟、仿真,并利用多媒体软件制作交互,模拟设备运行,为设计者反馈动态数据,并让客户直观地了解设备的运行原理和新功能,这对冶金机械设备制造行业的发展将起到非常积极的促进作用。     

A numerical model for real-time simulation of ship-ice interaction

A ship advancing in level ice will introduce several failure processes to the ice sheet, such as localised crushing and breaking due to bending stresses. The resulting ice fragments will interact with each other, with water and with the hull of the ship. They may rotate, collide, or slide along ship's hull, and eventually they will be cleared away. The situation is different in a broken ice field, i.e., large ice floes may behave similar to level ice while smaller floes will mostly be pushed aside, rotated or submerged. Modelling of such a complex system is very demanding and often computationally expensive which would typically hinder the chances for real-time simulations. This kind of simulations can be very useful for training personnel for Arctic offshore operations and procedures, for analysing the efficiency of various ice management concepts and as a part of the onboard support systems for station keeping. The challenge of meeting the real-time criterion is overcome in the present paper. The paper describes a numerical model to simulate the process of ship-ice interaction in real-time. New analytical closed form solutions are established and used to represent the ice breaking process. PhysX is used for the first time to solve the equations of rigid body motions in 6 degrees of freedom for all ice floes in the calculation domain. The results of the simulator are validated against experimental data from model-scale and full-scale tests. The validation tests exhibited a satisfactory agreement between the model calculations and experimental measurements.     

桥式起重机仿真训练系统研究

综合分析桥式起重机的结构特点和运动状态,提出了一种利用OGRE和PhysX物理引擎作为仿真平台,并在三维立体投影系统、真实操纵装置等硬件支持的桥式起重机仿真训练系统。介绍了仿真系统的整体结构和功能,并对开发平台做了简要概述,重点分析了仿真系统所采用的关键技术并给出了仿真效果的演示。系统能够模拟真实的桥式起重机操作环境,场景效果逼真,沉浸感强。