Using simulation for production transfer and process improvement.

摘要

In this project the system under study is the production process of the acrylic intraocular lens generation area. Acrylic intraocular lenses are a three-piece foldable lenses whose lens optic is made from acrylic material and the haptics from extruded polymethyl methacrylate material. Due to the transfer situation and the lack of real production data, management is having problems deciding an effective resource allocation.;For this reason, an animated simulation model of the acrylic generation area was build to study the process performance. Using the model, the resources utilization, and the average 29 days production of lens were analyzed to obtain a resource allocation that guarantees the demand volume fulfillment. The simulation model of the system was created using the Arena 3.0 software.;The simulation model was verified and validated in order to evaluate the degree to which the model corresponds to the real system. To perform the model verification, the animation option and other Arena tools were used. To perform the validation, the average time in system was selected as the performance measure of interest and real values of this measure were obtained from the company and statistically compared with the simulation model values output.;After the model validation, design of experiments was used to evaluate different scenarios and to determine the combination of equipment, operator and number of production shifts necessary to satisfy the sales forecast and the estimated cost associated with each scenario. Finally, a regression equation that included the statistically significant resources and other factors was established to provide management a tool to decide at any moment, an appropriate resources allocation for different estimates of demand. (Abstract shortened by UMI.).