Research And Development Of Virtual Disassembly System With Physical Properties

At present,urban construction,military aerospace,port logistics,manufacturing and other fields are inseparable from mechanical equipment.The scrapping,maintenance and disassembling of equipment have also become the key operation to affecting the production efficiency.Due to the tedious,long period and high-cost equipment disassembly process,virtual reality technology used to simulate the disassembly process could solve the above problems very well.At the same time,haptic interaction,an important interactive operation between human beings and natural environment,added in the virtual disassembly system.Researching the haptic-based virtual disassembly system can greatly enhance the user's immersion and make the user's interactive experience more realistic.The goal of this research is to develop a virtual disassembly platform with multi-mode interaction(mouse,keyboard and force feedback),and taking typical reducer as an example,mainly from three aspects: virtual scene modeling,force feedback interaction,physical attribute analysis and disassembly sequence optimization.The work mainly focused on the following aspects:(1)Aiming at the difficulties in virtual scene modeling,and in order to improve the fluency of virtual scene display,studied the optimization scheme from CAD software modeling to virtual platform;(2)Aiming at the realistic performance of force feedback interaction,studied the representation of physical properties of equipment models in virtual environment.Including physical property analysis,feedback force calculation and fusion technology about geometric models of equipment parts with physical properties;(3)In order to improve the practicability of virtual disassembly process,design a disassembly sequence-planning module.Based on the analysis of the equipment structure,a dismantling priority matrix is established.Then built Petri nets to analysis the disassembly sequence,disassembly time and disassembly cost have taken as members of the fitness function to initially the disassembly sequence.Finally,using genetic algorithm to evaluate and optimize the disassembly sequence.In addition,to guide disassembly through a disassembly sequence based on HUD.(4)Take the reducer as an example,using modular design thinking.Finish the disassembly interactive operation by using Phantom Omni force feedback device and other interactive devices.Construct the virtual disassembly scene with the graphics rendering engine(OSG)and physics engine(ODE).Using Visual Studio 2008 as the development platform and designing the user interface of virtual disassembly system with MFC function,achieve the integration of virtual disassembly platform finally.The disassembly platform composed of the automatic disassembly module,manual disassembly module,force feedback disassembly module and related auxiliary disassembly Pendant(scene roaming,stereo display etc.).And the platform also consider the disassembly sequence.