Marinus Luegmair

BMW Group · Research and Innovation

Uncertainties are significant in the early vibroacoustic development, e.g., of a car body, to prevent costly modifications close to the start of production. First, engineers must know which uncertain parameters are sensitive: Our previous work identified 170 uncertain parameters being sensitive out of a complex finite element model with 1,300 uncer...

div class="section abstract"> In order to predict reality as accurately as possible leads to the fact that numerical models in automotive vibroacoustic problems become increasingly high dimensional. This makes applications with a large number of model evaluations, e.g. optimization tasks or uncertainty quantification hard to solve, as they become c...

div class="section abstract"> Transfer path analyses of vehicle bodies are widely considered as an important tool in the noise, vibration and harshness design process, as they enable the identification of the dominating transfer paths in vibration problems. It is highly beneficial to model uncertain parameters in early development stages in order t...

div class="section abstract"> Uncertainties play a major role in vibroacoustics - especially in car body design in the preliminary development because of the overall spread in the production that should be covered with one simulation model. Therefore, we use uncertain input parameters to determine the stochastically distributed admittance of the ca...

Vibrating structures have received considerable critical attention as they radiate sound into enclosures where it is amplified by reflections. Surface and panel contribution analyses account for a useful tool to identify sound sources on vibrating structures. Current commercial solutions use the sound pressure at a field point inside the acoustic d...

Im Rahmen der hier vorliegenden Untersuchung wird die Vorlesung Signalverarbeitung in der Vibroakustik am Lehrstuhl für Akustik mobiler Systeme von Professor Steffen Marburg an der Fakultät Maschinenwesen der Technischen Universität München betrachtet. Der Fokus liegt dabei auf der Analyse der hybriden Durchführung im Wintersemester 20/21 im Vergle...

Für eine aussagekräftige Simulation ist die Betrachtung von Unsicherheiten relevant – unter anderem im Kontext der Vibroakustik im Automobilbereich. Hierzu müssen die statistischen Verteilungen der Input-Daten bekannt sein, die in der Regel anhand von Messungen ermittelt werden. Diese werden anschließend in einem Finite-Element-Simulationsmodell (F...

For the vibroacoustical behavior, uncertainties are relevant for a realistic simulation in the automo-tive sector. Statistical distributions of input data account for the focus of this contribution. These uncertain input data are processed in a finite element (FE) simulation model producing statistically distributed output data. It is our first aim...

During the last decades, big steps have been taken towards a realistic simulation of NVH (Noise Vibration Harshness) behavior of vehicles using the Finite Element (FE) method. The quality of these computation models has been substantially increased and the accessible frequency range has been widened. Nevertheless, to perform a reliable prediction o...

It is essential to include uncertainties in the simulation process in order to perform reliable vibroacoustic predictions in the early design phase. In this contribution, uncertainties are quantified using the generalized Polynomial Chaos (gPC) expansion in combination with a Finite Element (FE) model of a vehicle body in white. It is the objective...

A paradigm change in NVH (Noise-Vibration-Harshness) design of vehicles is currently happening. Instead of comparing a single nominal simulation with a single prototype or series vehicle measurement, the presence of uncertainties must be taken into account. These statistical uncertainties are well known from literature for many different parameter...

For dynamic simulations damping is an important parameter, which is typically unknown for mechanical systems and has to be evaluated. Based on the fact that a modal analysis is performed often more, this is a good opportunity to evaluate the damping. In the following it can be shown, parameters and the methods for modal parameter estimation have a...

High frequency transient wave propagation is a very interesting physical area. Currently, a large number of measurement methods are in use to qualify these signals. Typically, however, only the corresponding frequency domain spectra are computed and further investigated. Concerning the simulation of these signals there have been many attempts to ap...

In der vorliegenden Arbeit wird ein Simulationsverfahren entwickelt welches es ermöglicht die Körperschallausbreitung der Biegewelle und ihrer Effekte in Fahrzeugstrukturen zu simulieren. Hierbei werden sowohl transiente Welleneffekte als auch Eigenfrequenzen und -formen im hochfrequenten Bereich bis 20 kHz berücksichtigt. Die Motivation hierzu erg...

Der „hörende“ Sensor, der den im Crash entstehenden Körperschall auswertet, um die Leistungsfähigkeit moderner Airbagsysteme noch weiter zu perfektionieren, wird bald in Serie gehen. Aus diesem Grund und um die nächste Generation bereits vorbereiten zu können wird am Institut für Angewandte Forschung der Fachhochschule Ingolstadt, in Kooperation mi...

“Hearing” sensors, which measure structure-born sounds, caused from deformation of a car during crash in order to advance crash detection performance, will go into series production soon. For this reason and to bring the next generation on the way there are many research activities in the field of structure-born sound transmission on the Institute...