Development of a calculation tool for the natural frequencies of planar compliant mechanisms :
Entwicklung eines Berechnungstools für die Eigenfrequenzen von planaren nachgiebigen Mechanismen. - In: Achte IFToMM D-A-CH Konferenz 2022, (2022), insges. 2 S.
https://doi.org/10.17185/duepublico/75420
Analytical calculation of the deformation behavior of spatial compliant mechanisms :
Analytische Berechnung des Verformungsverhaltens räumlicher nachgiebiger Mechanismen. - In: Achte IFToMM D-A-CH Konferenz 2022, (2022), insges. 2 S.
https://doi.org/10.17185/duepublico/75435
CoMSys - a GUI-based calculation tool for the analysis and optimisation of compliant mechanisms :
CoMSys - ein GUI-basiertes Berechnungstool zur Analyse und Optimierung nachgiebiger Mechanismen. - In: Achte IFToMM D-A-CH Konferenz 2022, (2022), insges. 2 S.
https://doi.org/10.17185/duepublico/75432
On the influence of geometrical deviations of flexure hinges on the trajectory behaviour of straight-line compliant mechanisms for ultra-precision applications :
Zum Einfluss von geometrischen Abweichungen von Festkörpergelenken auf das Bahnverhalten von nachgiebigen Geradführungsmechanismen für Ultrapräzisionsanwendungen. - In: Achte IFToMM D-A-CH Konferenz 2022, (2022), insges. 2 S.
https://doi.org/10.17185/duepublico/75447
Improving energy efficiency of bipedal walking using nonlinear compliant mechanisms. - In: Proceedings in applied mathematics and mechanics, ISSN 1617-7061, Bd. 21 (2021), 1, e202100197, S. 1-3
A method to improve the energy efficiency of a bipedal robot by coupling its thighs with compliant smart mechanisms is introduced. The walking gaits are driven by electric motors in its revolute joints, whose reference trajectories are generated via numerical optimization. The optimized nonlinear characteristic of the compliant mechanism modifies the free oscillation frequency of the system that matches the current double step frequency even under different conditions, which results in a very high energy efficiency.
https://doi.org/10.1002/pamm.202100197
Synthesis of a compliant system from a given curve :
Synthese eines Nachgiebigen Systems mit gegebener Kennlinie. - In: IFToMM D-A-CH Konferenz 2021 der IFTOMM Member Organizations Austria, Germany, Switzerland, (2021), S. 87-88
https://doi.org/10.17185/duepublico/74063
Das Biege-Torsions-Steifigkeitsverhältnisses von Festkörpergelenken mit Standard- und Polynomkonturen :
The bending-torsion-stiffness ratio of flexure hinges with common and polynomial notch shapes. - In: IFToMM D-A-CH Konferenz 2021 der IFTOMM Member Organizations Austria, Germany, Switzerland, (2021), S. 74-75
https://doi.org/10.17185/duepublico/74059
Comparison of nonlinear continuum beam models with finite beam models for the analysis of compliant mechanisms :
Vergleich nichtlinearer Kontinuums-Balkenmodelle mit finiten Balkenmodellen für die Analyse nachgiebiger Mechanismen. - In: IFToMM D-A-CH Konferenz 2021 der IFTOMM Member Organizations Austria, Germany, Switzerland, (2021), S. 58-61
Nachgiebige Mechanismen haben sich für eine Vielzahl von Anwendungen in der Feinwerk-, Mess- und Mikrotechnik etabliert. Für den iterativen Entwurf sowie die Optimierung von nachgiebigen Mechanismen besteht ein Bedarf an zeiteffizienten Analysemodellen mit möglichst geringen Abweichungen zum gefertigten Mechanismus. Hierfür wurden eine Reihe verschiedener Modellierungsansätze zur Beschreibung des Bewegungsverhaltens entwickelt und untersucht, unter denen nichtlineare Kontinuums-Balkenmodelle und nichtlineare finite Balkenmodelle ein hohes Potenzial zeigen. Trotz der ähnlichen Ansätze der Balkentheorie ergeben sich Unterschiede im Einsatz beider Modelle, die aufbauend auf den Ergebnissen bestehender Veröffentlichungen im Rahmen dieses Beitrages näher diskutiert werden.
https://doi.org/10.17185/duepublico/74053
Synthesis method for the determination of suitable geometric parameters of flexure hinges :
Synthesemethode zur Bestimmung geeigneter Geometrieparameter von Festkörpergelenken. - In: IFToMM D-A-CH Konferenz 2021 der IFTOMM Member Organizations Austria, Germany, Switzerland, (2021), S. 28-29
https://doi.org/10.17185/duepublico/74040
Influence of silver/silver chloride electroless plating on the Shore hardness of polyurethane substrates for dry EEG electrodes. - In: Current directions in biomedical engineering, ISSN 2364-5504, Bd. 7 (2021), 2, S. 9-12
Dry electrodes enable a shorter preparation time for infant EEG. Since infant skin is more sensitive than adult skin, soft electrodes are required to reduce the mechanical stress for this sensitive skin. Thus, soft electrodes are crucial for eventual repetitive and long-term use like in neonatal intensive care units. A biocompatible polyurethane (PU) can be produced in low hardness resulting in a soft and flexible electrode substrate. Silver/silver chloride (Ag/AgCl) electroless plating provides a conductive, electrochemically stable coating but the process may alter the mechanical properties of the electrode substrate. In this study, we assess the hardness of PU material before and after Ag/AgCl plating. The test sample design for Shore hardness measurement is based on ISO 7619-1:2010. Sample production consists of a 3D print master model, silicone molding, PU casting, and finally electroless plating. UPX 8400-1 (Sika AG, Switzerland) is used for the sample substrates. Test samples are produced with 7 different Shore hardness (range A40-A95) and 14 samples (each hardness: 1 uncoated and 1 coated). The hardness measurements are carried out with a lever-operated test stand Shore hardness tester model with a digital hardness tester (TI-AC with HDA 100-1, KERN & SOHN GmbH, Germany). It is shown that there is a hardness increase (Shore A) due to Ag/AgCl coating with a grand average of 1.1±0.7 (p<0.05). The largest increase of 2.1±0.2 is seen on the initial lowest Shore hardness sample (Shore hardness: 43.4±0.1). The absolute increase of hardness due to the Ag/AgCl coating decreases with increasing substrate hardness. It is concluded that there is no strong hardness increase of PU substrates due to Ag/AgCl plating. Therefore, the material is suitable as a soft electrode for repetitive and long-term use in infant applications.
https://doi.org/10.1515/cdbme-2021-2003