Guenther Siegl, Senior Machine Dynamics Engineer


Günther Zwarg

Mr. Siegl was born in 1948 in Berlin. He started his mechanical engineering studies at the Beuth Engineering Faculty in Berlin, and later switched to the Technical University of Berlin where he graduated with a Master in Mechanical Engineering. He worked as a professor assistant at the institute for vibrations and machine dynamics of the TU-Berlin. The main tasks were the independent teaching of the exercises Machine Dynamics I and II; He also wrote a Ph.D. at the institute with the subject: “the bending vibration behavior of rotors, which have a laminated core.

After the Ph.D., he worked as a development engineer for mechanics and system dynamics at the industrial institute Ottobrunn. His main task was the theoretical mentoring of the wheel and track rolling test rig in Munich. He deduced calculation models and he communicated on a regular basis with the external project customers: the companies BMW, Daimler-Benz and others as well as the federal office for military engineering and procurement. He was also responsible for the development of an autonomous program for the calculation of 3D multi-body systems.

He moved in 1992 to the large drive division of Siemens in Berlin, his tasks were:
- Rotor-dynamics design of larger electrical motors and drivetrains
- Technical measurements in the Siemens test rig and on-site; Acoustics, Vibrations, Imbalance.
- Structure dynamical studies for ship drives and their fundaments, especially regarding the rotor-structure interaction on structure-borne noise
- Development of magnetic bearings and supplementary bearings; simulation of rotor failures
- Cooperation with academic and mentoring of final year projects
- Driving the “simulation and technical measurements” inside the Siemens working group
- Writing patents and technical papers


he retired in 2013 from Siemens in Berlin and he has worked since as a freelance consutlting engineert. The problems he can  solve are varied, for example:
- Assembly from vibration isolated machines in the 3D room
- Vibration uncoupling of machine components
- Coupling of rotor dynamics and structures
- Unbalance response studies ….

Calculation tools and mathematical programming

Dr. Siegl has very good mathematical knowledge. He wrote the equations of special mechanisms and solves the systems of linear or in-linear equations. He is an experimented Fortran and Mathlab programmer. He prefers own programs, as commercial Finite Elements programs have simplified equations and a reduced application range.

In Ottobrunn, he supervised the roll test rig for the transformation of the complete rig output into the simulation. The study of the stability, as well as the estimation of the relevant parameters for the maximum allowed speed was assessed. He worked as well on the new multi-body program NUSTAR and he contributed to the development of the model library with new modules of articulations and driving paths.

During his work at Siemens, he started the development of the company simulation tool SimSys with an extensive library of multi-physical special elements. This program was intensively used for the simulation of failures of the magnetic bearings by large drivetrains. The rotor model in combination with several innovative models for supplementary bearings (3D ball-bearings and dry friction bearings) and for the drive allows a transient observation of the potential weaknesses and hazards.