Model-Based Design and Characterization of an Actuator with Low-Boiling Liquid

Visually impaired people rely on special equipment for access to graphic representations in digital form. The available devices are very large and expensive. A simple and cost-effective alternative to the existing concepts for haptic displays is therefore desirable. This paper evaluates the concept of a lifting actuator based on a fluid with a low boiling point for this purpose. A functional prototype is constructed and its behavior is characterized. A corresponding model is built and validated to simulate the actuator and to analyze its operation. It provides detailed information about the actuator that can be used to further develop the design and to make decisions on the usability of the new actuator in the product design process. Following test runs and investigations on the model, the actuator concept proved to be suitable for haptic display devices under certain assumptions. Therefore the newly developed model presents a good starting point for future revisions of the concept.