Professor Norbert Hoffmann

Wernitz B, Vitanov N, Hoffmann N, 2013, Friction induced vibration as multi-scale dynamics, 11th International Conference on Recent Advances in Structural Dynamics

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Tiedemann M, Kruse S, Hoffmann N, 2013, Steps towards silent brakes – dominant damping effects: the relevance of joints., Eurobrake 2013

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Hoffmann N, 2013, Physical oceanography, a mathematical introduction with MATLAB, Publisher: TAYLOR & FRANCIS LTD

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Chabchoub A, Kimmoun O, Branger H, Hoffmann N, Proment D, Onorato M, Akhmediev Net al., 2013, Experimental Observation of Dark Solitons on the Surface of Water, PHYSICAL REVIEW LETTERS, Vol: 110, ISSN: 0031-9007

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• Citations: 83

Vitanov N, Chabchoub A, Hoffmann N, 2013, Deep-water waves: on the nonlinear Schroedinger equation and its solutions., Journal of Theoretical and Applied Mechanics, Vol: 43, Pages: 43-54

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Hoffmann NP, 2013, Ocean Waves and Fluid Structure Interaction: New Insight and Efficient Computational Strategies., COME

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Chabchoub A, Hoffmann N, Onorato M, Slunyaev A, Sergeeva A, Pelinovsky E, Akhmediev Net al., 2012, Observation of a hierarchy of up to fifth-order rogue waves in a water tank, PHYSICAL REVIEW E, Vol: 86, ISSN: 2470-0045

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• Citations: 168

Chabchoub A, Hoffmann N, Onorato M, Slunyaev A, Sergeeva A, Pelinovsky E, Akhmediev Net al., 2012, Observation of a hierarchy of up to fifth-order rogue waves in a water tank., Phys Rev E Stat Nonlin Soft Matter Phys, Vol: 86

We present experimental observations of the hierarchy of rational breather solutions of the nonlinear Schrödinger equation (NLS) generated in a water wave tank. First, five breathers of the infinite hierarchy have been successfully generated, thus confirming the theoretical predictions of their existence. Breathers of orders higher than five appeared to be unstable relative to the wave-breaking effect of water waves. Due to the strong influence of the wave breaking and relatively small carrier steepness values of the experiment these results for the higher-order solutions do not directly explain the formation of giant oceanic rogue waves. However, our results are important in understanding the dynamics of rogue water waves and may initiate similar experiments in other nonlinear dispersive media such as fiber optics and plasma physics, where the wave propagation is governed by the NLS.

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Wernitz BA, Hoffmann NP, 2012, Recurrence analysis and phase space reconstruction of irregular vibration in friction brakes: Signatures of chaos in steady sliding, JOURNAL OF SOUND AND VIBRATION, Vol: 331, Pages: 3887-3896, ISSN: 0022-460X

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• Citations: 37

Chabchoub A, Akhmediev N, Hoffmann NP, 2012, Experimental study of spatiotemporally localized surface gravity water waves, PHYSICAL REVIEW E, Vol: 86, ISSN: 2470-0045

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• Citations: 67

Chabchoub A, Akhmediev N, Hoffmann NP, 2012, Experimental study of spatiotemporally localized surface gravity water waves., Phys Rev E Stat Nonlin Soft Matter Phys, Vol: 86

We present experimental results on the study of spatiotemporally localized surface wave events on deep water that can be modeled using the Peregrine breather solution of the nonlinear Schrödinger equation. These are often considered as prototypes of oceanic rogue waves that can focus wave energy into a single wave packet. For small steepness values of the carrier gravity waves the Peregrine breathers are relatively wide, thus providing an excellent agreement between the theory and experimental results. For larger steepnesses the focusing leads to temporally and spatially shorter events. Nevertheless, agreement between measurements and the Peregrine breather theory remains reasonably good, with discrepancies of modulation gradients and spatiotemporal symmetries being tolerable. Lifetimes and travel distances of the spatiotemporally localized wave events determined from the experiment are in good agreement with the theory.

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Chabchoub A, Hoffmann N, Onorato M, Akhmediev Net al., 2012, Super Rogue Waves: Observation of a Higher-Order Breather in Water Waves, PHYSICAL REVIEW X, Vol: 2, ISSN: 2160-3308

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• Citations: 384

Chabchoub A, Neumann S, Hoffmann NP, Akhmediev Net al., 2012, Spectral properties of the Peregrine soliton observed in a water wave tank, JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, Vol: 117, ISSN: 2169-9275

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• Citations: 18

Chabchoub A, Hoffmann NP, Akhmediev N, 2012, Observation of rogue wave holes in a water wave tank, JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, Vol: 117, ISSN: 2169-9275

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• Citations: 22

Weiss C, Hothan A, Huber G, Morlock MM, Hoffmann NPet al., 2012, Friction-induced whirl vibration: Root cause of squeaking in total hip arthroplasty, JOURNAL OF BIOMECHANICS, Vol: 45, Pages: 297-303, ISSN: 0021-9290

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• Citations: 21

Dimitrova ZI, Hoffmann NP, 2012, ON THE PROBABILITY FOR EXTREME WATER LEVELS OF THE RIVER ELBA IN GERMANY, COMPTES RENDUS DE L ACADEMIE BULGARE DES SCIENCES, Vol: 65, Pages: 153-160, ISSN: 1310-1331

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• Citations: 2

Kruse S, Hoffmann N, 2011, Non-linear friction-induced instabilities due to inner resonance?, European Nonlinear Oscillations Conference 2011

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Kruse S, Hoffmann N, 2011, On the robustness of mode-coupling instabilities in friction induced systems, Eurodyne 2011

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Chabchoub A, Hoffmann NP, Akhmediev N, 2011, Rogue Wave Observation in a Water Wave Tank, PHYSICAL REVIEW LETTERS, Vol: 106, ISSN: 0031-9007

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• Citations: 917

Hothan A, Huber G, Weiss C, Hoffmann N, Morlock Met al., 2011, The influence of component design, bearing clearance and axial load on the squeaking characteristics of ceramic hip articulations, JOURNAL OF BIOMECHANICS, Vol: 44, Pages: 837-841, ISSN: 0021-9290

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• Citations: 48

Withalm M, Hoffmann NP, 2011, Solitary vortex solutions in a sheared and differentially heated vertical fluid layer with stable stratification, EUROPEAN JOURNAL OF MECHANICS B-FLUIDS, Vol: 30, Pages: 245-251, ISSN: 0997-7546

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• Citations: 1

Behrendt J, Weiss C, Hoffmann NP, 2011, A numerical study on stick-slip motion of a brake pad in steady sliding, JOURNAL OF SOUND AND VIBRATION, Vol: 330, Pages: 636-651, ISSN: 0022-460X

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• Citations: 42

Withalm M, Hoffmann NP, 2011, Influence of Thermal Stratification on the Stability of Ekman-Couette-Flow, PAMM, Vol: 11, Pages: 593-594, ISSN: 1617-7061

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Chabchoub A, Hoffmann NP, 2011, Short-Term Prediction of the Sea State Dynamics, PAMM, Vol: 11, Pages: 699-700, ISSN: 1617-7061

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Hothan A, Huber G, Weiss C, Hoffmann N, Morlock Met al., 2011, Deformation characteristics and eigenfrequencies of press-fit acetabular cups, CLINICAL BIOMECHANICS, Vol: 26, Pages: 46-51, ISSN: 0268-0033

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• Citations: 24

Stingl B, Hoffmann NP, 2011, A Mesoscopic Friction Model Based on Surface Roughness and its Statistical Description, ASME Annual Meeting

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Withalm M, Hoffmann N, 2010, Secondary stability analysis of type I Ekman boundary layer vortices., European Fluid Mechanics Conferenc 8

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Weiss C, Gdaniec P, Hoffmann NP, Hothan A, Huber G, Morlock MMet al., 2010, Squeak in hip endoprosthesis systems: An experimental study and a numerical technique to analyze design variants, MEDICAL ENGINEERING & PHYSICS, Vol: 32, Pages: 604-609, ISSN: 1350-4533

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• Citations: 43

Hoffmann NP, Stolz U, 2010, On transient growth of wear pattern properties, WEAR, Vol: 268, Pages: 886-892, ISSN: 0043-1648

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• Citations: 4

Withalm M, Hoffmann NP, 2010, Localized Roll-Solutions in the Ekman-Couette-System, PAMM, Vol: 10, Pages: 489-490, ISSN: 1617-7061

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