DELTA JS AG offers software, engineering and consulting services in the field of machine dynamics and rotordynamics. Typically the company deals with high precision machines, whose functioning or service life is affected by even the smallest vibrations.

The company name originates from the Greek letter “delta”, which is used as a symbol for damping in engineering. Damping is an important factor to ensure the smooth running and safety of machines.

DELTA JS is located in the Technopark in Zurich, Switzerland, which is very close to the Swiss Federal Institute of Technology (ETH) and to innovative companies. As a result cutting edge projects can be carried out efficiently, taking account of state-of-the-art findings from research and development as well as practical experience.

The program MADYN 2000 ® developed and offered by DELTA JS is a leading software for rotordynamics allowing to simulate complex rotor-gear-bearing systems with all types of bearings (spring and damper bearings, fluid film bearings, active magnetic bearings) and bearing supports.

Apart from the proprietary software MADYN 2000 ® the company disposes of the finite element program ANSYS ® for general structure dynamics, the software MATLAB ® for general mathematics and graphics, as well as of further specialised engineering software such as SEAL2D/3D for the analysis of fluid forces in seals. The tools can be combined e.g. for coupled rotor structure analyses to consider complex flexible casings.

The engineering experience of DELTA JS covers a wide field of sophisticated machinery such as turbo machines for industrial applications, power generation and propulsion.

Rotordynamic Seminars

The next rotordynamic seminar including an additional day for the demonstration of practical rotordynamic analyses with MADYN 2000 will take place in Zurich from April 18^th until 20^th 2012. A registration form is available here.

 

Rotordynamic Software MADYN 2000

Version 3.5 is ready. The main new feature of this version is the simulation of transient run ups and downs for speed dependent systems. Additionally many other features and improvements were implemented, such as an improved sorting of modes for Campbell diagrams and other parameter variations, the analyses of critical speeds from Cambell diagrams, the processing of transient time histories (spectra and waterfall plots), an improved analysis of ring speeds for floating ring bearings... More details are avaiable in the release notes.

 

1^st Middle East Turbomachinery Symposium from February 13^th to 16^th 2011

DELTA JS (Joachim Schmied) was invited to present a case study, which is also described in a paper.

 
8^th International Conference on Rotor Dynamics of the IFToMM in South Korea from September 12^th to 15^th 2010
DELTA JS presented the paper "Nonsynchronous Tilting Pad Bearing Characteristics" by Joachim Schmied (DELTA JS), Alexander Fedorov and Boris Grigoriev (both Polytechnical University Saint Petersburg). This time we did not win the the price for the best paper (Jorgen W. Lund Memorial Award). Nevertheless the paper received a lot of attention. Further papers with pariticipation of DELTA JS were "Rotordynamic Modelling as a Powerful Support Tool for Vibration Analysis on Large Turbomachinery" by Kris Matthys, Koen de Bauw (both Laborelec) and Marco Perucchi (DELTA JS), as well as "Asymmetrical Heating in a Tilting Pad Journal Bearing Causing Shaft Bending" by Boris Grigoriev, Alexander Fedorov (both Polytechnical University Saint Petersburg) and Joachim Schmied (DELTA JS).