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Derivation of Analytical, Closed‐form Formulas for the Calculations of Instantaneous Screw Axes of Arbitrary Rigid 3D Multi‐Body Systems
(2021-01-25)
A method to calculate the parameters for each instantaneous and relative instantaneous screw axis in an arbitrary rigid multi‐body system is presented. At first a kinematic analysis is performed which calculates the displacements of all nodes and the rotation of each body. In the next step the displacements of the nodes and the rotation of the bodies are used to calculate the instantaneous screw axis of each body. With the information on the instantaneous screw axes the instantaneous relative screw axes can be computed ...
Aufsatz
Actuation of an elastic membrane by the use of an electrorheological valve
(2021-01-25)
The dynamic response of a fluidic actuator is investigated on the basis of numerical simulations. With this actuator a membrane is excited to oscillate by means of an electrorheological valve. For this purpose the solid and fluid domains are coupled. Furthermore, the constitutive equation of the fluid is coupled to the electric field. The dynamic response is discussed on the example of a variable stiffness of the membrane. Actuators of this type offer the potential to delay the transition of a boundary layer.
Aufsatz
Measuring the Time Discretization Error in Linear Elasticity
(2021-01-25)
The present paper considers the spread of longitudinal waves in an elastic rod. On the one hand an analytical solution is presented, on the other hand a spatially and temporally discretized continuum formulation of this problem is treated. With these approaches at hand the appearing time discretization error is analyzed using various quantities.
Aufsatz
Simultaneous determination of Bingham material parameters using a ball probe concrete rheometer
(2021-01-25)
A new evaluation method allowing direct determination of the Bingham parameters from ball probe rheometers. A non‐linear relationship between the direct measured variables and the material parameters is revealed through numerical parameter studies. The method was validated on two devices of the ball probe type with different dimensions. Comparison with other methods showed good agreement. It is pointed out how the evaluation method can be transferred to devices having other dimensions by performing a limited number ...
Aufsatz
Experimental investigations of viscoelastic and ferroelectric heating in PZT–5H
(2021-01-25)
This contribution focuses on the separation of two effects causing a temperature change in experiments with electrically loaded ferroelectrics. These materials are often subjected to cyclic loading, where viscoelasticity prevails at lower electric fields, whereas dissipative heating by domain switching governs the heating above the coercive field. Different frequencies and load amplitudes are investigated experimentally.
Aufsatz
The Transformation of Food Culture on the Case of Kyrgyz Nomads - A Historical Overview
(2021-07-27)
The society in Kyrgyzstan experiences a triple burden of malnutrition which occurs when undernutrition, overnutrition and micronutrient deficiency coexists, straining the public health system. This research investigates historical trends of nutrition transition of nomadic and semi-nomadic Kyrgyz and foods consumed earlier before industrialisation and intensification of agriculture started. Qualitative research design inspired by historical analysis and sociological methods were employed. Saturation sampling was used ...
Aufsatz
Neuorientierung für das Business-Coaching
(2021-08-16)
Ausgangspunkt der folgenden Beiträge ist die Arbeit „Coaching in der zweiten Romantik: Abstieg oder Aufstieg?“ von Böning und Strikker. Drei Autor/innen nehmen Stellung zu den Fragen: Welchen Einfluss kann Coaching auf den gesellschaftlichen und politischen Diskurs nehmen, um sowohl gesamtgesellschaftliche als auch politische Handlungsnotwendigkeiten aufzugreifen und dazu Stellung zu nehmen? Wie gestaltet Coaching organisationsbezogen kulturelle und politische Verhältnisse mit, wie sie die Autoren unter anderem in ...
Aufsatz
Demut gegenüber der Fehlbarkeit des Handelns im Business-Coaching (Humility in the face of the fallibility of action in business coaching)
(2021-08-04)
Rezension zu Heidi Möller, Jannik Zimmermann (2020): Schwierige Situationen im Business-Coaching. Praxisbeispiele, Perspektiven und Handlungsmöglichkeiten. Wiesbaden: Springer, 206 Seiten, 39,99 €.
Aufsatz
Extension of Gap Bridgeability and Prevention of Oxide Lines in the Welding Seam through Application of Tools with Multi-Welding Pins
(2021-07-30)
Friction stir welding has become important in many areas of production and is increasingly used for joining aluminum components. For long welding seams, conventional tools with only one welding pin reach their technical limitations due to low gap bridgeability. When welding aluminum, the stirred in surface layers, such as oxides, lead to a decrease in static and dynamic strength since linear accumulations are formed in the welding seam. The aim of the present study is to increase the gap bridgeability using tools ...
Aufsatz
Technological Frames in the Digital Age: Theory, Measurement Instrument, and Future Research Areas
(2021-05-21)
Digital technologies fuel technological change that generates substantial uncertainty and complexity. Corporate actors rely on their technological frames to cope with these challenges. Technological frames determine how actors interpret, assess, and shape a technology’s development, usage, and trajectory. However, the research fails to provide insights into the microfoundations that can explain the consequences of heterogeneity in technological frames. We argue that this research gap is due to a lack of a proper ...