Virtual Reality System For Huge-Equipment Lifting

As the increase of China's overall national strength, the scale of domestic petroleum, chemical industry, steel-making, nuclear power and other industrial expand towards oversize. Refining units increase from the original hundreds of DWT to nearly 10 million DWT even over thousands of DWT. During the next 20 years, nuclear power plant construction will progress into the third stage of development, namely, the large-scale construction and popularization stage. The development of construction modes, such as the new module type pre-casting and integral assembling, prompted the growth of the lifting equipment sizes and the weight of hoisting components, which will put forward higher requirement for lifting industry. The trend to large-scale and heavy type of the hoisting equipments makes the operation process much more complex, and also brings difficulty beyond the previous hoisting working. Under the condition that hoisting equipment weight keeps increasing, hoisting of large structures becomes the necessity of the related development. The efficiency, safety and behavior predictability of large structures hoisting process become subjects of great significance.Aiming at the above goal and challenges, the problem of large structures hoisting plan is hard to solve relying on plan production staff and hoisting engineers'experience mode. In order to eliminate the unsuccessful schemes in the lifting process in advance, virtual reality simulation method is necessary for development of large structures hoisting simulation virtual reality system. In this paper, a statics based double-machine collaborative simulation mathematic model of large structures were established, and solved the method; Moreover, according to the dual machine collaborative hoisting principle, necessary abstraction and the double cranes collaborative hoisting dynamics model are established. During the developing procedure of the simulation system, the open-source rendering graphics engine OGRE is used in this article, and open source dynamics engine Bullet works as a basic tool. After the thorough understanding and study of related engine, the necessary expansion and development of simulation system is done. Utilization of design patterns helps to abstract the relationships among the system modules in hoisting process, and to found the flexible dynamic environment model which suits the non-specific conditions. According to the working characteristics of the truck crane, the parametric car crane model is established. Finite automata theory is introduced to the simulation process of cranes, which gains stable control over various kinds of hoisting state of crane, so to get a good a good foundation for the crane automation establishment.By systematic analysis and design, a strong, maintainable, extensible, reusable and efficient simulation system of large structures hoisting is established. The performance of this simulation system, illustrates that the simulation system enables efficient formulation of large-scale structures hoisting plan, and improves the security. The combination of the engineering application of large structures hoisting and electronic computer information technology makes large structures hoisting improved a lot.