DELTA JS was founded in 1997 by Dr. Joachim Schmied who earned his doctorate at the University of Darmstadt's Institute for Machine Dynamics in Germany. Before starting his own company he has gained 12 years practical experience in the turbomachinery industry.

Since its foundation the turnover of DELTA JS has grown by more than 20% per year on average and the company has achieved outstanding developments in the field of machine dynamics and rotor dynamics:


Introduction of a method to detune the buckets of a Pelton turbine runner based on model identification from measured data. The method was among others applied to a 423MW runner in the Bieudron plant in Switzerland.


Introduction of a method to establish hot spot stability charts, which have proved their benefit in many engineering and troubleshooting projects. Hot spot instabilities are also known as Morton or Newkirk effect.


Introduction of a rotordynamic analysis tool for systems with magnetic bearings, which has been licensed to the magnetic bearing pioneers in the turbomachinery industry.


Implementation of a system for crack detection in the rotors of a hydroelectric power plant based on shaft vibration measurements.


Development of a program to simulate transient drops of magnetically supported rotors into the back-up bearings.


Start of the project MADYN 2000 with the goal to develop a general rotordynamic software, which combines the power of DELTA JS’s existing tools with easy-to-use graphical user interfaces, an object-oriented data structure and state-of-the-art plots with clear and complete information about models and results.


General release of the rotordynamics software MADYN 2000, which has quickly found customers in the industry.


Commissioning of a test stand for the identification of transfer functions for seal forces. The applied method is described in a paper .


Winner of the Jorgen W. Lund memorial award for the best paper at the IFTOMM rotordynamic conference.


First general rotordynamic seminar in Zurich.


Release 3 of the rotor dynamic program MADYN 2000 is ready. It is another milestone regarding the userfriendliness of the program. For more see...

2009 ...:

Implementation of nonlinear fluid film bearing analyses in MADYN 2000 (see release notes version 3.1 to 3.3). Since then one to two new versions are released every year with new features (see release notes)