Research On Design For Maintenance In Airplane General Arrangement Design

To further improve maintainability of airplane, the newly-designed airplanes commonly use the concept of Design for Maintenance (DFM). It brings chances for the development of theories anf technologies in manatainability analysis, verification and evaluation, and pushs forwards greatly the development of manatainability engineering using digital technologies.In view of the general arrangement enormous impacts the maintainability of airborne equipments, and therefore it is necessary to carry out the design for maintenance in the general arrangement design, and to rapid analyze and assess the general arrangement plan on the impact of the maintainability of airborne equipments. The core issue is the equipment disassembly, namely, equipment disassembly sequences and disassembly path.The comprehensive application disassembly sequence planning technology and virtual maintenance technology are used to solve these problems. Uses sequence planning to guide the virtual maintenance with the disassembly sequence, and uses virtual maintenance to test and verify the disassembly sequence with disassembly path and interference check.In the disassembly sequence planning, according to the form of airborne equipment installed with the characteristics of m-dimensional removable improves Petri net-based disassembly sequence planning method:â‘ Simplify and abstract the disassembly structure with the approach to maximize the base part and combine the fasteners and its associated equipment into the overall.â‘¡Aiming at the characteristics of m-dimensional removable of airborne equipment, extends the values and description of disassembly precedence constraints relationship, the analysis method is discussed, and gives a engineering simplified analysis processes.â‘¢Based on P/T system and the Colored Patri Net, Disassembly Petri Net (DPN) are established, and the disassembly sequence and concurrent disassembly sequence solution method are discussed.In the virtual maintenance, most of current virtual maintenance environment is independent of CAD system so that modification of product information and result of maintainability analysis and evaluation can not be fed back to CAD system automatically and directly, which not only impairs design efficiency but also causes information isolated island. In this paper, the technical line that "increase VR function into CAD system" is used to directly build a virtual maintenance environment in the CAD system: â‘ Establishs a virtual maintenance environment integrated into CAD system, research and realized data gloves integration, virtual environment interaction and 3D display.â‘¡Presents a bi-directional information transmission model VM-CADPIM, to solve the problem that it is difficult to transmit information bi-directionally between the traditional virtual maintenance system and the CAD system.â‘¢With the goal of integratability, expansibility and portability to establish the virtual maintenance system architecture into CAD system and the prototype system IVMS based on CATIA and its second development environment CAA. The prototype system realizes the functions such as virtual scene browsing and virtual disassembly.