Energy efficiency in materials testing by reactive power part 2: resonance method in fatigue testing

Dietmar Findeisen; Dirk Schröpfer

doi:10.1515/mt-2024-0350

Article

Energy efficiency in materials testing by reactive power part 2: resonance method in fatigue testing

Dietmar Findeisen
Prof. Dr.-Ing. habil. Dietmar Findeisen (1935–2024) studied Mechanical Engineering at TH Hannover, earning his doctorate in 1974. He habilitated in vibration machines in 1984, became apl. professor at TU Berlin in 1989, and taught “Elements of Vibration Control” and “Hydraulics and Pneumatics” there from 1976 to 2002. He led the “Scientific Instrumentation” division at Federal Institute for Materials Research and Testing (BAM) until 2000. His research included systems theory, vibration engineering, complex power theory, and hydrostatic power transmission.
and Dirk Schröpfer
Dr.-Ing. Dirk Schröpfer, born in 1981, studied materials engineering at TU Ilmenau, obtaining his Dipl.-Ing. in 2007. He worked as an R&D engineer at QSIL AG and joined BAM as a research assistant in 2012. He earned his doctorate in 2017 in the field of welded joint integrity. Since then, he has been a postdoctoral researcher at BAM, focusing on innovative manufacturing processes and component safety. In 2022, he became head of the “Testing Devices and Equipment” division at BAM.

Published/Copyright: December 23, 2024

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From the journal Materials Testing Volume 67 Issue 2

Abstract

Reactive power is related to the type of power that does not consume energy but stores it. In the design of test machines, the utilization of this physical phenomenon would be very beneficial. Reactive power allows for the combination of power amplification with energy savings, making it an ideal principle for conducting long-term tests that involve high loads and prolonged energy consumption. This work focuses on testing machines operating in resonance, which allows for higher test frequencies and reduced test durations. Various types of fatigue testing machines, including those with rotating-unbalance actuators, servo-hydraulic actuators, and piezoelectric actuators, are examined through vibration analysis, methodical design, and mechatronics. Resonant testing machines provide significant advantages in energy efficiency and test accuracy for a wide range of applications in materials testing. These methods are crucial for future applications in industries where energy efficiency and precise fatigue testing are critical, such as aerospace, automotive, and civil engineering.

Keywords: reactive power; amplitude magnification; power amplification; fatigue testing; resonant test machines

Corresponding author: Dirk Schröpfer, Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, Germany, E-mail: dirk.schroepfer@bam.de

In memory of Dietmar Findeisen.

About the authors

Dietmar Findeisen

Prof. Dr.-Ing. habil. Dietmar Findeisen (1935–2024) studied Mechanical Engineering at TH Hannover, earning his doctorate in 1974. He habilitated in vibration machines in 1984, became apl. professor at TU Berlin in 1989, and taught “Elements of Vibration Control” and “Hydraulics and Pneumatics” there from 1976 to 2002. He led the “Scientific Instrumentation” division at Federal Institute for Materials Research and Testing (BAM) until 2000. His research included systems theory, vibration engineering, complex power theory, and hydrostatic power transmission.

Dirk Schröpfer

Dr.-Ing. Dirk Schröpfer, born in 1981, studied materials engineering at TU Ilmenau, obtaining his Dipl.-Ing. in 2007. He worked as an R&D engineer at QSIL AG and joined BAM as a research assistant in 2012. He earned his doctorate in 2017 in the field of welded joint integrity. Since then, he has been a postdoctoral researcher at BAM, focusing on innovative manufacturing processes and component safety. In 2022, he became head of the “Testing Devices and Equipment” division at BAM.

Research ethics: Not applicable.
Informed consent: Not applicable.
Author contributions: The authors have accepted responsibility for the entire content of this manuscript and approved its submission.
Use of Large Language Models, AI and Machine Learning Tools: DeepL to improve English language.
Conflict of interest: The authors state no conflict of interest.
Research funding: None declared.
Data availability: Not applicable.

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Published Online: 2024-12-23

Published in Print: 2025-02-25

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Articles in the same Issue

https://doi.org/10.1515/mt-2024-0350

Keywords for this article

reactive power; amplitude magnification; power amplification; fatigue testing; resonant test machines