Papers by Author: Liang Dong

Abstract: Fixtures, tools, and other assembly resources have an important role in the assembly of complex products, so it is very necessary to consider the interactive relationship between the resources model and the product model for assembly order planning in 3D environment. Firstly, the features of assembly process planning involved resources are analyzed. Secondly, the concept of the assembly process intention（AsmPI） is introduced，and an assembly process can be divided into an AsmPI sequence. Thirdly, based on the graph theory, a resource-involved assembly process model is built up. At last, setting a typical structure as an example, the validity of this modeling method is verified.

Abstract: In a discrete assembly system, setting its optimal production status is one of the key works in assembly line balancing. Based on analyzing the objectives of assembly line control, a general flow for setting the optimal production status is proposed, and a method to identify rapidly the setting objects of production status is introduced. Then an optimal configuration solution for production status and its solving method in a station of an assembly line are established based on the genetic algorithm. At last, a wing assembly line is set as an example to validate this method, and the result shows that this method can provide a solution to optimize production status parameters for each station in this assembly line, which can reduce the resource idle time and cost, and so its resource utilization rate is improved.

Abstract: The 3D assembly process planning and simulation system can improve the product manufacturing level in airplane manufacturing enterprises, but now there is few system of this kind. So we design a system named Digital Virtual Airplane Assembly Process Planning and Simulation System (DVA²P²S²) to improve the situation. Firstly, we design the system’s structure with data support, systems integration and functions development and user application as its three levels. Secondly, its running flow is introduced. Thirdly, two key technologies which are 3D digital assembly process structure and the method of automatic creation of simulation file are discussed. At last, we set a subassembly of an airplane to validate the DVA²P²S². The result shows that the DVA²P²S² is in accordance with the Concurrent Engineering’s requirements, and it can improve the work efficiency and reduce the process design iteration and cycle significantly.

Abstract: Computer Aided Assembly Process Planning and Simulation in 3D environment depends mainly on the manner of human-computer interaction currently in the airplane manufacturing industry, and in fact it’s just a recorder for recording the designers’ assembly intention. It’s short of supports for a designer to execute the 3D assembly process planning and simulation, for lacking a strict process flow definition and a pilot method. In this respect, we propose a decomposition modeling method of 3D assembly process planning and simulation for airplane subassembly named Assembly Process Micro-Planning and Simulation (APMPS), which defines a standardization flow and a data-information modeling method. By using this method, the assembly process can be designed and validated form assembly-design-intention to assembly-process-planning to assembly-process-simulation with the five process levels’ definition (AJATAOAAAM). This method is validated by a central-wing’s assembly process design in an airplane manufactory. The result shows that the APMPSS is in accordance with the Concurrent Engineering’s requirements, and it can be carried out fast in 3D environment.