Volker Mehrmann. Institut f. Mathematik, TU Berlin, Germany.

Volker Mehrmann received his Diploma in mathematics in 1979, his Ph.D. in 1982, and his habilitation in 1987 from the University of Bielefeld, Germany. He spent research years at Kent State University in 1979-1980, at the University of Wisconsin in 1984-1985, and at IBM Research Center in Heidelberg in 1988--1989. After teaching in the years 1990-1992 as a visiting full professor at the RWTH Aachen,  he was a full professor at TU Chemnitz from 1993 to 2000. Since then he is full professor for Mathematics at TU Berlin.

He is a member of acatech (the German academy of engineering), academia europaea, he was president of GAMM the (International association of Applied Mathematics and Mechanics), and since 2019 he is president of the European Mathematical Society (EMS). He was chair of MATHEON, the Research Center `Mathematics for key technologies´ and chair of the Einstein Center ECMath in Berlin. 

He is SIAM Fellow, has held an ERC Advanced Grant and also was member of the ERC Mathematics Panel. He is editor of several journals in numerical analysis and editor-in-chief of Linear Algebra and its Applications. His research interests are in the areas of numerical mathematics/scientific computing, applied and numerical linear algebra, control theory, and the theory and numerical solution of differential-algebraic equations.
 

Talk: 

Stability of dynamical systems with applications to brake squeal. A port-Hamiltonian approach.

Abstract of the talk: 

Brake squeal is an annoying phenomenon in almost all technical brake systems. It is a resonance phenomenon associated with a flutter instability.
To remove brake squeal it is necessary to carry out a stability analysis for extremely large finite element models of brakes and to optimize damping material properties. A new approach of energy based modeling for brake systems  is presented that allows to check instability/stability of the systems using the structure of the models. This port-Hamiltonian system description directly shows the origins for the squeal and leads to very efficient methods to compute stability radii and to robustly optimize the oscillation properties of brake systems.