Digital Factory (DF) technology is one of the most important part of manufacturer enterprise information systems, its core technology is modeling & simulation. This paper introduced the digital factory concept and its functions with multi-level multi-resolution modeling and simulation method; we established a new framework of the digital factory technology. It combines with the features of DF and simulation technology which expands the development of DF and application of simulation technology. A case was taken to show the feasibility of multi-level modeling & multi-resolution simulation technology attaching to the DF technology.

This paper investigates the planning of the workshop logistics distribution system for an assembly line in an engineering machinery manufacturing company producing mainly concrete mixer trucks. The study covers mainly some methodologies in selecting appropriate logistics distribution mode, determining the distribution lot size and part-sets, and deciding the material packing method under some distribution batching rules. The simulation software QUEST is employed for carrying out some systematic simulation experiments and analysis, so as for finding an ideal logistics distribution scheme and improving the performance of the production logistics system.

In the mixed-production context of make-to-stock (MTS) and make-to-order (MTO), the manufacturing system becomes more complex for comprehensive balance of multiple objectives, including resource utilization, work in process (WIP), on-time delivery and throughput. To deal with this complexity, a dynamic production plannning and control (PPC) model with the hybrid of workload control (WLC) and theory of constraint (TOC) is presented. While the proposed three-tiered hierarchy construction model is relatively similar to WLC model, but the way in which the workloads are controled has changed dramatically. The order acceptance deals with issues of order review and delivery setting in order to balance the overall resource capacity and requirements that is necessary for on-time delivery. The order release deals with issues of release mechanisms and rules in order to control the flow of work to the production floor that is necessary for WIP and resource utilization.And the scheduling deals with issues of bottleneck identicification and task sequencing in order to protect the bottleneck capacity that is necessary for throughput.

Traditional planning methods ignore the enterprise production capacity,the paper depend on the specific case in enterprise production to build a Production Scheduling System which applies Drum-Buffer-Rope theory. This system proposes the high output, low work in process and on time delivery as the goals, considering the bottleneck resource as well as providing the master production plan with the bottleneck resource, in addition employing the simulation optimization software-Simio to optimize the bottleneck process scheduling and raise the utilization ratio of bottleneck resource.

Printed circuit board (PCB) assembly planning problem has been given lot of attention to efficiently manage the orders of different PCB products. However, little effort has been paid to describe its comprehensive model which can demonstrate all the planning problems collectively considering in the surface mount technology (SMT) lines. A mixed integer model for PCB assembly line which includes the integration of different levels of the planning problems and considered component allocation problem (line balancing), PCB model sequencing problem (mixed model sequencing problem), feeder arrangement problem and component placement sequencing problem on different SMT machines collectively. Current research is significant to solve different planning problems of the PCB assembly line simultaneously to get the overall global solution of the problem in future.