Daniel J. Rixen
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Real-time simulation of flexible bodies with ray-traced contact in the unity game engine Open
Computer simulations of structural mechanics, like Finite Element Method (FEM) models or multibody systems, have been a standard tool for engineers for a long time; nevertheless, those kinds of simulations are typically performed offline, …
Room for Improvement: A Blended Learning Concept With Teachers as Tutors and a Digital Exercise Type for Mechanical Equations Open
Room for Improvement is a teaching concept that combines a digital learning platform with in‐person, tutor‐supported learning. Students work individually and actively on the platform while being physically present in a shared room with oth…
Real-Time Simulation of Flexible Bodies with Ray-Traced Contact in the Unity Game Engine Open
Computer simulations of structural mechanics, like Finite Element Method (FEM) models or multibody systems, have been a standard tool for engineers for a long time; nevertheless, those kinds of simulations are typically performed offline, …
PRANK: A Singular Value Based Noise Filtering of Multiple Response Datasets for Experimental Dynamics Open
High quality measurements are paramount to a successful application of experimental techniques in structural dynamics. The presence of noise and disturbances can significantly distort the information stored in the data and, if not adequate…
Multi-DoFs nonlinear joint identification through substructure decoupling Open
Nonlinear joint identification is essential for predicting the dynamic behavior of complex mechanical systems with localized nonlinearities at the joint. The FRF Decoupling Method for Nonlinear Systems (FDM-NS) characterizes nonlinear join…
Enabling Experimental Impulse-Based Substructuring Through Time Domain Deconvolution and Downsampling Open
Dynamic substructuring, especially the frequency-based variant (FBS) using frequency response functions (FRF), is gaining in popularity and importance, with countless successful applications, both numerically and experimentally. One drawba…
Centralized vs. Decoupled Dual-arm Planning Taking into Account Path Quality Open
The aim of coordinated planning is to avoid robot-to-robot collisions in a multi-robot system, and there are two standard solution approaches: centralized planning and decoupled planning. Our first contribution is a decoupled planning appr…
A novel optimization framework using frequency-based substructuring for estimation of linear bolted joint stiffness and damping Open
Estimating the stiffness and damping coming from a joint is a major challenge. This work proposes a novel framework to estimate the unknown parameters using frequency-based substructuring and a maximum a posteriori optimization approach. T…
Design optimization of a snowboard performing an ollie Open
The ollie, a fundamental manoeuver in snowboarding, serves as a basis for various tricks requiring high altitude and extended airtime. The maximum ollie height depends on the snowboard’s geometry and structural characteristics. In this stu…
ECSW hyperreduction of hyper-viscoelastic components via co-simulation with Abaqus Open
Rubber components are widely spread in engineering due to their mechanical properties such as high strength, elongation, and dissipation characteristics. Modeling rubber behavior poses challenges because of its complex visco-elastic proper…
On the experimental coupling with continuous interfaces using frequency based substructuring Open
In experimental dynamic substructuring, coupling of substructures sharing a line- or surface-like interface proves to be a challenge due to the difficulties in interface modelling. Modelling a high number of degrees of freedom at the commo…
PRANK: a singular value based noise filtering of multiple response datasets for experimental dynamics Open
High quality measurements are paramount to a successful application of experimental techniques in structural dynamics. The presence of noise and disturbances can significantly distort the information stored in the data and, if not adequate…
Enabling Experimental Impulse-Based Substructuring through Time Domain Deconvolution and Downsampling Open
Dynamic substructuring, especially the frequency-based variant (FBS) using frequency response functions (FRF), is gaining in popularity and importance, with countless successful applications, both numerically and experimentally. One drawba…
Comparison of different optical techniques to measure skin vibrations Open
We test different possible setups to measure skin vibrations in the abdominal region which could, in the future, enable quick and comfortable monitoring of aortic aneurysms in the abdominal region. For this study, a simple mechanical model…
Centralized vs. Decoupled Dual-Arm Planning Taking into Account Path Quality Open
The aim of coordinated planning is to avoid robot-to-robot collisions in a multi-robot system, and there are two standard solution approaches: centralized planning and decoupled planning. Our first contribution is a decoupled planning appr…
AMPIE: Added Mass Passive Input Estimation - Acquiring Driving Points without Direct Excitation. Open
Experimental and hybrid substructuring allow the virtual analysis of complex structures that are rather represented by experimental models than simulations. Coupling the experimental models with other structures requires adequate driving p…
Computing Forces by ECSW-Hyperreduction in Nonlinear Magnetodynamic FEM Problems Open
This contribution proposes a novel strategy to apply the hyperreduction principle for the mechanical force calculation of non-linear magnetodynamic problems in a FEM context. The already established Energy Conserving Sampling and Weighting…
A First Experience with Multidimensional Contact Real-Time Hybrid Substructuring: Toward Testing of Foot Prostheses Open
Real-time hybrid substructuring (RTHS) is a promising approach to investigate the influence of foot prostheses on the gait pattern in versatile situations, while avoiding the necessity to model the prosthesis and its ground interaction. A …
Spherical Cubic Blends: $\mathcal{C}^{2}$-Continuous, Zero-Clamped, and Time-Optimized Interpolation of Quaternions Open
Modern collaborative robotic applications require robot motions that are predictable for human coworkers. Therefore, trajectories often need to be planned in task space rather than configuration space ( $\mathcal{C}$ -space). While the int…
Walking like a robot: do the ground reaction forces still intersect near one point when humans imitate a humanoid robot? Open
Bipedal walking while keeping the upper body upright is a complex task. One strategy to cope with this task is to direct the ground reaction forces toward a point above the centre of mass of the whole body, called virtual pivot point (VPP)…