18 Development of an Electrodynamic Actuator for an Automatic Modal Impulse Hammer 199 One open issue is the task of generating impacts with the same peak force. Therefore, the hammer would need some force-feedback and a learning algorithm to find the right parameters. After the learning process, the real measurements can be taken. Technically this is not easy, due to the requirements for a high sampling rate and the accurate force measurement. Acknowledgments The lead author would like to thank the students Karl Benkler, Christoph Dietz and Jonas Koch for their helpful work in the lab and their constructive comments. References 1. Arens, T., Hettlich, F., Karpfinger, C., Kockelkorn, U., Lichtenegger, K., Stachel, H.: Mathematik. Springer, Berlin/Heidelberg (2018). https:// doi.org/10.1007/978-3-662-56741-8 2. Brandt, A.: Noise and Vibration Analysis: Signal Analysis and Experimental Procedures. Wiley (2011). https://ebookcentral-proquest-com. eaccess.ub.tum.de/lib/munchentech/detail.action?docID=792461 3. Brown, D.L., Allemang, R.J., Phillips, A.W.: Forty years of use and abuse of impact testing: a practical guide to making good FRF measurements. In: Experimental Techniques, Rotating Machinery, and Acoustics, vol. 8, pp. 221–241. Springer International Publishing (2015). https://doi.org/10.1007/978-3-319-15236-321 4. Bryc, W.: The Normal Distribution. Springer, New York (1995). https://doi.org/10.1007/978-1-4612-2560-7 5. DRV8850 Low-Voltage H-Bridge IC With LDO Voltage Regulator. Texas Instruments (2016) 6. Ewins, D.J.: Modal testing: theory and practice. Research Studies Press Wiley, Letchworth, Hertfordshire, England, New York (1984). ISBN:9780863800177 7. Maierhofer, J., Mahmoudi, A.E., Rixen, D.J.: Development of a low cost automatic modal hammer for applications in substructuring. In: Conference Proceedings of the Society for Experimental Mechanics Series, pp. 77–86. Springer International Publishing (2019). https://doi. org/10.1007/978-3-030-12184-6_9 8. NGSolve.: version: 6.2.1908. (2019) 9. ParaView.: version: 5.6.0. (2019) 10. Welch, P.: The use of fast Fourier transform for the estimation of power spectra: a method based on time averaging over short, modified periodograms. IEEE Trans. Audio Electroacoust. 15(2), 70–73 (1967). ISSN: 0018-9278. https://doi.org/10.1109/TAU.1967.1161901. http:// ieeexplore.ieee.org/document/1161901/.
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