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Analysis of an experimental setup for structural damping identification

Hentschel O. P., Bonhage M., Panning-von Scheidt L., Wallaschek J., Denk M., Masserey P.- A.

Journal of Theoretical and Applied Mechanics

2016

Vol. 54 nr 1

27--39

In the present paper, an experimental setup for structural damping determination arising from energy dissipations within the material is presented. The experimental setup is developed in such a way that all unintended damping sources are eliminated. In this connection, priority is also given to the reproducibility of the experimental data. In addition, a vacuum chamber is developed to reduce the damping arising from the interaction with the surrounding medium. Furthermore, beam-shaped specimens are clamped in a suspended way, using screws with an apex to fix the specimens in their nodes of vibration. Then, the influence of test rig specific parameters on the damping value is analyzed. In this context, an ideal setup of the test rig is identified to measure structural damping values arising from dissipations within the material. Finally, a common model for material damping description is parameterized using the experimental data.

Introduction and evaluation of a damping determination method based on the Short-Term Fourier transform and Resampling (STFR)

Hentschel O. P., Panning-von Scheidt L., Wallaschek J., Denk M.

Journal of Theoretical and Applied Mechanics

2015

Vol. 53 nr 2

395--407

In the present paper, a frequency domain method for damping determination is presented. The described method is especially developed for low damped systems with well separated eigenfrequencies. Using the Short-Term Fourier transform and Resampling (STFR) of the signal, decay curves of several mode shapes can be identified and amplitude-dependent damping values can be calculated. Additionally, two common methods for damping determination are explained briefly. Finally, the quality of the introduced method is evaluated comparing the variances of the identified damping values by means of different methods. In this context, the damping for beams clamped in a suspended way is analyzed. Stainless steel is used as the specimen material.