Decomposition of vibrating structures and system requirements for independent component design


Vibration, Dynamic Systems, Decomposition, Space Payload Design, Eigenfrequencies

Problem Definition

For complex dynamic system with concurrent static and dynamic loads, e.g. during rocket launch, component design in early project phases is barely possible. With system requirements, the component requirements cannot be easily broken down due to strong interaction for vibrating structures. Optimization of components can only be realized in sequence which leads to iterative design cycles. Finding a feasible design poses difficulty with the current design approach. 


A design approach with decomposition of system requirements for dynamic properties, e.g. eigenfrequencies, is developed to enable independent component design. With separated requirements individual parts can be designed within their design space. The decomposition assures that the overall system requirement is fulfilled and, therefore, the components can be developed with maximum freedom, i.e. additional optimization such as mass reduction can be independently carried out. 


A system requirement for eigenfrequency is decomposed for subsystems by energy formulation and rigid body consideration. Design spaces can be defined which enables independent component design. The system requirement is satisfied whenever the component design satisfies the decomposed requirements. Design optimization can now be carried out on component level as a simultaneous activity instead of sequential. A solution space in dependency of component design variables can show the limitation for each component.

The developed methods will be applied to the Wide Field Imager of the Athena Project.

Project Partners

Max-Planck-Institute for extraterrestrial physics