Synthesis method for compliant mechanisms of high-precision and large-stroke by use of individually shaped power function flexure hinges. - In: Advances in mechanism and machine science, (2019), S. 1569-1578
Optimization-based approach to the embodiment design of compliant mechanisms with different flexure hinges. - In: Advances in mechanism and machine science, (2019), S. 1579-1588
Fluid-mechanical compliant actuator for the insertion of a cochlear implant electrode carrier. - In: Mechanism and machine theory, Bd. 142 (2019), 103590, insges. 16 S.
In this paper an insertion method of electrode carriers of straight and curved form is shown for the use in cochlear implants. The aim of using a fluid-mechanical actuator is to minimise the contact between the electrode carrier and the cochlea and consequently avoiding damage during its insertion. First, the synthesis method used for beam-shaped fluid-mechanical actuators is shown. The model-based scaling of parameters demonstrates that actuators must be geometrically similar to reach the same form by same inner pressure. This fact facilitates the experimental investigations using up-scaled demonstrators. Electrode carriers as fluid-mechanical actuators of straight and curved form are designed by theory of curved rods for large deformations. For these carriers, a gentle insertion used a stylet and fluidic actuation in combination and is described analytically by the above mentioned theory. The results demonstrate that the insertion of a curved electrode carrier requires lower pressure and does not need any inner pressure in the end position. The measurements of the deformation behaviour of carrier demonstrators prove the validity of the analytical model. The maximum value of the differences between calculated and measured results of the inner pressure is about 10%.
https://doi.org/10.1016/j.mechmachtheory.2019.103590
Investigations of different compliant manipulator concepts for a high-precise rotational motion. - In: Proceedings of the 19th International Conference of the European Society for Precision Engineering and Nanotechnology, (2019), S. 64-67
Due to their advantages over conventional mechanisms, compliant mechanisms with notch flexure hinges are state of the art in precision engineering and micro systems technology. These compliant mechanisms are often used in positioning and adjustment applications with up to six degrees of freedom. In addition to the translational motions, as they are mainly required in linear tables and planar stages, also rotational motions are needed. For the realization of a high-precise rotation by compliant manipulators certain concepts with different complexity are existing. One approach is the use of flexure hinges with different geometrical parameters and notch shapes, which can be purposefully optimised depending on the requirements of the specific application. Another approach is the use of compliant mechanisms, in which the instantaneous centre of rotation represents the axis of rotation of the guided link either according to the remote centre of compliance concept or within the mechanism design space itself. In addition, a novel concept using a specific configuration of a four-bar mechanism, in which two adjacent links are of an equal length is presented in this contribution. The different approaches are compared by means of kinematic investigations and FEM-based simulations and the potential regarding a high-precise rotation with path deviations in the low micrometre range is shown.
Mechanical properties of an adjustable weighing cell. - In: Proceedings of the 19th International Conference of the European Society for Precision Engineering and Nanotechnology, (2019), S. 86-89
Detection of surface texture with an artificial tactile sensor. - In: Interdisciplinary applications of kinematics, (2019), S. 43-50
Analysis of the dynamic behavior of beams supported by a visco-elastic foundation in context to natural vibrissa. - In: Interdisciplinary applications of kinematics, (2019), S. 51-59
Optimization of compliant mechanisms by use of different polynomial flexure hinge contours. - In: Interdisciplinary applications of kinematics, (2019), S. 265-274
This paper presents the application of different polynomial flexure hinge contours in one compliant mechanism in order to increase both simultaneously the precision and the stroke of the output motion of compliant mechanisms. The contours of the flexure hinges are optimized in dependency of the required elasto-kinematic properties of the mechanism. This new approach for optimization is described in comparison to the use of identical common hinge contours. Based on previously optimized single polynomial flexure hinges, the validity of proposed guidelines is analyzed for a combination of several flexure hinges in two compliant mechanisms for linear point guidance. The rigid-body models of both mechanisms realize an approximated straight line as output motion. The compliant mechanisms are designed through the rigid-body replacement method and with different polynomial flexure hinges with orders varying from 2 to 16. The multi-criteria optimization is performed by use of non-linear FEM simulations. The derived values for the kinematic output parameters are compared for the ideal model and the optimized compliant mechanism. The results are discussed and conclusions for ongoing research work are drawn.
Compliant mechanisms for ultra-precise applications. - In: Interdisciplinary applications of kinematics, (2019), S. 249-256
This paper reports about enhanced compliant mechanisms with flexure hinge based on new analytic and/or FEM models that have been manufactured by state of the art wire EDM technology. Experimental proofs at test benches, equipped with ultra-precise interferometer based length and angular measurement systems, show first time the residual deviation to the intended path of motion with a resolution of nanometers/arc seconds. Theoretically determined and measured data are in good correlation. Repeatability limitations are rather more given by the residual noise of the overall test arrangement and mainly not by the mechanism itself.
Approach to the dynamical scanning of object contours using tactile sensors. - In: Proceedings, 2019 IEEE International Conference on Mechatronics (ICM), (2019), S. 364-369
https://doi.org/10.1109/ICMECH.2019.8722882