Modeling and Simulation of Static and Dynamic Behavior of Pre-stressed Joints in Machine Tools using Relative-Bedding-Elements

• Applicant: Professor Dr.-Ing. Steffen Ihlenfeldt, since 12/2015
• Subject Area: Engineering Design, Machine Elements, Product Development ; Production Systems, Operations Management, Quality Management and Factory Planning
• Term: from 2015 to 2018
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 276183611

The Finite Element Analysis (FEA) is an important tool for the simulation of static and dynamic behavior of machine tools. The elements in FEA use shape functions for approximation of their physical characteristics. Commonly linear or higher-polynomial functions are used. Application of linear elements has the advantage of numerical simplicity however they have the disadvantage of need for many elements for sufficient model quality. On the other hand modeling with higher order function can do this with much less elements. In this context the modeling of elastic joints (i. e. in machine tools) poses a large-scale issue. State of the art joint models are limited suited for modal and frequency response analysis. So a realistic prediction of static and dynamic behavior will be difficult. Therefore the intention of his research project is the development and practice of a modeling approach for pre-stressed elastic joints which makes currently used closely spaced element meshing obsolete and which correctly interoperates with higher-polynomial finite elements - like beams and shells. In this way, the present gap between current descriptions of joints using discrete spring-damper-elements, layers of material or various non-linear contact models should be closed. Furthermore this method enables an efficient model-based identification process of stiffness and damping parameters because the systems degree of freedom becomes significantly smaller. Here the requested first year of the project deals with the experimental proof of sufficient acceptance to the model side linearization of stiffness and damping in strained joints.

• DFG Programme: Research Grants
• Ehemaliger Antragsteller: Professor Dr.-Ing. Knut Großmann, until 12/2015 (†)