1. Flowserve Etten-Leur, Parallelweg 6, Etten-Leur 4878 AH, The Netherlands;
2. Department of Mechanical Engineering, University of Twente, P.O. Box 217, Enschede 7500 AE, The Netherlands
3. Flowserve Etten-Leur, Parallelweg 6, Etten-Leur 4878 AH, The Netherlands e-mail:
4. Flowserve Etten-Leur, Parallelweg 6, Etten-Leur 4878 AH, The Netherlands