PhD - Improving Machining Productivity Using Inerters

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Tuned Inerter Dampers (TIDs) are an exciting new approach to vibration control, that have not yet seen application within a machining context. Inerters are devices that generate a force proportional to the relative acceleration across the device. This is in contrast to a pure mass, where the force is proportional to absolute acceleration. Inerter-based devices such as TIDs can be more lightweight when compared to classical tuned mass dampers. This is particularly relevant to machining applications, because they could be more readily deployed on machine beds, columns, boring bars, or robots. All of these suffer from having payload and space limitations, which justifies the need for compact and lightweight methods for vibration control. Meanwhile, vibration control is a key technology that enables high productivity in machining, due to the constraints imposed by forced and self-excited vibration (e.g. chatter). Consequently this project seeks to develop a tuned inerter damper that is suitable for use in machining applications. The objectives are:1) assess the feasibility of tuning inerters using magnetorheological fluids as the operating medium, thereby proposing the concept of a semi-active inerter.2) develop device sizing and design rules for semi-active inerters 3) experimentally validate the model and design procedures4) assess the suitability for using the device for suppression of undesirable vibrations during machining, such as chatter.