On real-time pseudo-dynamic sub-structure testing: algorithm,numerical and experimental results |
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| Institution: | 1. Bauhaus University Weimar / FOMEKK, Marienstr. 13c, D-99421 Weimar, Germany;2. Section Steel and Composite Structures, University of Kassel, Germany;3. German Aerospace Centre (DLR), Institute of Aeroelasticity, Bunsenstrasse 10, 37073 Göttingen, Germany;4. German Aerospace Centre (DLR), Institute of Robotics and Mechatronics, Postfach 116, D-82230 Wessling, Germany;1. Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, NY;2. Department of Diagnostic, Molecular, and Interventional Radiology, Mount Sinai Hospital, New York, NY;3. Department of Population Health Science and Policy, Mount Sinai Hospital, New York, NY;4. BioMedical Engineering and Imaging Institute, Mount Sinai Hospital, New York, NY;5. Icahn School of Medicine at Mount Sinai, Mount Sinai Hospital, New York, NY;6. Department of Radiology, Weill Cornell Medicine, New York, NY;1. School of Mechanical Engineering, Xi''an Jiaotong University, Xi''an 710049, PR China;2. State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi''an Jiaotong University, Xi''an 710049, PR China;1. INSA – Lyon, Laboratoire Vibrations-Acoustique (LVA), 25 bis, av. Jean Capelle, F-69621 Villeurbanne Cedex, France;2. GTM – Grup de recerca en Tecnologies Mèdia, La Salle, Universitat Ramon Llull, C/Quatre Camins 30, 08022 Barcelona, Catalonia, Spain;1. INSA–Lyon, Laboratoire Vibrations-Acoustique (LVA), 25 bis, av. Jean Capelle, F-69621 Villeurbanne Cedex, France;2. GTM – Grup de recerca en Tecnologies Mèdia, La Salle, Universitat Ramon Llull, C/ Quatre Camins 30, 08022 Barcelona, Catalonia, Spain |
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| Abstract: | The real-time pseudo-dynamic sub-structure (SubPSD) test is a new procedure for dynamic testing of structures. Here, the actual test specimen is a part, i.e. sub-structure, of a larger, complex system. The main structure is simulated on a computer which is in interaction with the test rig.One possible application is the qualification test of a payload (sub-structure) mounted in a carrier rocket (computer model). Consideration of the interaction between main- and sub-structure will yield more realistic results than conventional shaking table tests. This can be a good basis for a more effective, light-weight design of the payload.An algorithm is presented, which is based on the Newmark time domain solution of the equation of motion. It uses sub-stepping instead of iteration to reach equilibrium within each time step. This algorithm and a suitable hardware allow for true real-time performance of the SubPSD test, even with oscillatory sub-structures. Numerical studies are presented which demonstrate the accuracy but also the limits of the procedure. Experimental results of a 4 d.o.f. test model are compared to the numerical results. |
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