Flexible Design Modeling Methodology for MEMS Based on Petri Net

Micro-scale effect and multi-field coupling are characteristics of the design of micro-electro-mechanical system(MEMS).However,the current macroscopic structure-oriented CAD systems have not been able to meet the increasing requirements for the design in micrometer scale.Therefore,a flexible design modeling methodology for MEMS based on Petri net is put forward.Firstly,the highly cohesive and low coupling modules are obtained via refining and abstracting the existing CAD systems on the basis of analyzing the design characteristics,framework and process of MEMS.Secondly,the flexible design modeling framework for MEMS based on Petri net is built by associating the Petri net with the modules of the design system.Then,the forward-position places and weighted directed arcs are added to regulate the maximum and minimum tokens of the places to control the number of design flow.Afterwards,the control places are added to format control loops and make concurrent transitions occur orderly to solve the conflicts in concurrent design.Finally,the modules are controlled to operate with the state space results of Petri net.The multiple relationships between the complex design flows are then realized.An independent prototype system using ACIS as geometry modeling kernel has been developed to validate the proposed method with the design of capacitive 3D silicon micro comb drive.The test results proved that the present design methods are extended from top-down,bottom-up and hybrid to flexible design based on Petri net.The product design is no longer restricted to fixed process.It has important significance to improve efficiency and quality of the design of MEMS.