Kompaktmodell für die Charakterisierung eines piezoelektrischen Membrandruckkopfes

Dosing minute Amounts of Fluid with drop-on-demand techniques is an important technique in many industries. Therefore a broad Palette of fluids with varying widely different Properties are employed. This necessitates an adaption of the droplet generator design to the specific application requirements. Theoretical modeling of the system behavior is therefore an important tool to complement RP fabrication and allow for a targeted design approach. Due to the complexity of the process, which extends over three physical domains, a FEA Simulation of the complete droplet generation process is a very difficult Task. Therefore common FEA-Models are confined to only one or two physical domains. For a Simulation of the full droplet generation proves a compact model, based on discretized components, is devised. The Model consists of three submodels, one for the electrical domain and one for the mechanical and the fluidmechanical domain, respectively. To conduct the Simulation those submodels are coupled bidirectionally. The submodels are derived by application of basic physical relationships, e.g. the bending differential equation for the mechanical submodel. For the implementation the tool MATLAB™/ Simulink™ is used.