Publications · Methods & research
Publications on OrAgL and the methods behind it: from harmonic balance and frictional contact to model reduction. Much of it was carried out together with industry and validated on test rigs.
selected publications with DOI
papers on friction and contact
Springer book on harmonic balance
eight years of research, continuously updated
Journal of Computational and Nonlinear Dynamics 21(2), 021003
Optimisation-based uncertainty bounds from residual tractions for turbine blades with underplatform dampers.
Mechanical Systems and Signal Processing 224, 112016
International benchmark of blind predictions for a bolted thin-walled structure against measurements.
Mechanical Systems and Signal Processing 229, 112482
Substructuring model reduction for frictionally clamped thin-walled structures with geometric and contact nonlinearity.
Journal of Sound and Vibration 617, 119301
Couples a fine boundary-element contact model with a coarse FE model to predict friction damping in joints.
Journal of Engineering for Gas Turbines and Power 146(5), 051020
Test rig for friction-saturated self-excited vibrations; measurements compared with the harmonic balance solver OrAgL.
Computer Methods in Applied Mechanics and Engineering 423, 116860
Continuation with parallel model refinement across model fidelities.
Journal of Sound and Vibration 590, 118570
Harmonic balance for quasi-periodic vibrations with hysteresis, two to three orders of magnitude faster.
Mechanical Systems and Signal Processing 201, 110651
Conservative frequency response bounds for non-unique residual tractions using nonlinear modes.
Journal of Engineering for Gas Turbines and Power 145(7), 071009
Compares fully coupled frequency- and time-domain methods for flutter-induced limit cycles.
Journal of Engineering for Gas Turbines and Power 144(9), 091006
Identifies blisk mistuning from fast forced-response sweeps, validated on a real compressor blisk.
Mechanical Systems and Signal Processing 180, 109410
Prediction and measurement of strongly modulated vibro-impact response of two beams, in very good agreement.
Mechanical Systems and Signal Processing 180, 109407
Sphere-on-beam impact tests compared with a reduced model that is three to four orders of magnitude faster than FE.
Computers & Structures 260, 106698
Dynamic substructuring and reduced models for elastodynamic contact problems.
Journal of Engineering for Gas Turbines and Power 143(1), 011007
Underplatform damper tests: pressure-dependent contact stiffness explains the observed hardening and improves contact models.
Journal of Fluids and Structures 102, 103233
Fully coupled fluid-structure harmonic balance for friction-limited flutter cycles of bladed disks.
Journal of Vibration and Acoustics 143(3), 031003
Shows how modal interactions limit the friction damping of self-excited vibrations.
Journal of Engineering for Gas Turbines and Power 142(5), 051006
Turbine blade with root friction: PLL and force-controlled tests validate a reduced nonlinear model.
Journal of Engineering for Gas Turbines and Power 142(2), 021013
Shows that tip-shroud friction can explain multi-wave flutter vibrations in turbine blade rows.
ASME Turbo Expo 2020, GT2020-14670
Follow-up study to the OrAgL validation: effect of excitation and mode shape on blade vibrations.
Journal of Engineering for Gas Turbines and Power 141(2), 021019
Compares OrAgL predictions with measurements on a rotating test rig and in the engine.
Springer · Mathematical Engineering (book)
Methodological foundations of harmonic balance for nonlinear vibration problems.
Mechanical Systems and Signal Processing 114, 413–438
Compares time- and frequency-domain methods on structures with bolted joints.
Journal of Turbomachinery 140(5), 051005
Combines structural mistuning with blade-to-blade variation of aerodynamic forcing in a compressor blisk.
International Journal of Non-Linear Mechanics 99, 240–246
Studies how creep alters the nonlinear vibration behaviour of blades with interlocked shrouds.
A selection of work on OrAgL or involving Dr.-Ing. Johann Gross and the NoVibTech team. All details were checked via DOI with the publisher or Crossref. Each publication reflects its own state of research; none is a blanket validation of every current software feature. Awards as listed on the University of Stuttgart institute profile.
Next step
Want to know which method fits your component? Let’s talk about your problem.
