Analyse und Optimierung der Maschinenvibrationen an einem Tribometer

This study focuses on the structural dynamic optimization of a test rig used in the tribology laboratory at Montanuniversität Leoben. The test rig is employed for tribological experiments and is equipped with an electric motor capable of operating at rotational speeds of up to 8,000 rpm. Due to insufficient structural dynamic design, the full performance potential of the motor could not be utilized. To identify the dynamic behavior of the existing system, an experimental modal analysis was initially carried out. Based on the acquired data, a finite element model (FEM) was developed and validated by comparison with the experimental results. Subsequently, the structural model was systematically optimized through a series of simulations with the aim of eliminating eigenmodes within a frequency range of up to 133 Hz. The optimized design solution was implemented through construction and manufacturing, followed by integration into the test rig. A further experimental modal analysis conducted on the modified system confirmed the results of the numerical simulations and demonstrated the effectiveness of the structural reinforcements. The modular design of the reinforcements allows for flexible adaptation to various experimental setups. Finally, this work provides a set of recommendations indicating which modules should be employed for specific types of tests. The high level of agreement between numerical and experimental analyses underlines the validity of the approach and confirms that the developed structural modifications fulfill their intended purpose.