Imperial College London
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Professor Norbert Hoffmann

Faculty of Engineering, Department of Mechanical Engineering

Visiting Professor
 
 
 
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Contact

 

n.hoffmann

 
 
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Location

 

557City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

192 results found

Peric R, Hoffmann N, Chabchou A, 2015, Initial wave breaking dynamics of Peregrine-type rogue waves: A numerical and experimental study, EUROPEAN JOURNAL OF MECHANICS B-FLUIDS, Vol: 49, Pages: 71-76, ISSN: 0997-7546

Journal article

Vitanov NK, Hoffmann NP, Wernitz B, 2014, Nonlinear time series analysis of vibration data from a friction brake: SSA, PCA, and MFDFA, CHAOS SOLITONS & FRACTALS, Vol: 69, Pages: 90-99, ISSN: 0960-0779

Journal article

Papangelo A, Stingl B, Hoffmann NP, Ciavarella Met al., 2014, A simple model for friction detachment at an interface of finite size mimicking Fineberg's experiments on uneven loading, PHYSICAL MESOMECHANICS, Vol: 17, Pages: 311-320, ISSN: 1029-9599

Journal article

Soto-Crespo JM, Devine N, Hoffmann NP, Akhmediev Net al., 2014, Rogue waves of the Sasa-Satsuma equation in a chaotic wave field, PHYSICAL REVIEW E, Vol: 90, ISSN: 1539-3755

Journal article

Akhmediev N, Soto-Crespo JM, Devine N, Hoffmann NPet al., 2014, Rogue waves of the Sasa-Satsuma equation in a chaotic wave field

Conference paper

Soto-Crespo JM, Devine N, Hoffmann NP, Akhmediev Net al., 2014, Double peak rogue waves of the Sasa-Satsuma equation in a chaotic wave field

We study the properties of the chaotic wave fields generated in the frame of the Sasa-Satsuma equation, and analyze the presence of rogue waves in them. Our results also reveal the reason for the skewed profile of the exact rogue wave solutions. © 2014 OSA.

Conference paper

Akhmediev N, Soto-Crespo JM, Devine N, Hoffmann NPet al., 2014, Rogue waves of the Sasa-Satsuma equation in a chaotic wave field

Conference paper

Soto-Crespo JM, Devine N, Hoffmann NP, Akhmediev Net al., 2014, Double peak rogue waves of the Sasa-Satsuma equation in a chaotic wave field

We study the properties of the chaotic wave fields generated in the frame of the Sasa-Satsuma equation, and analyze the presence of rogue waves in them. Our results also reveal the reason for the skewed profile of the exact rogue wave solutions. © 2014 OSA.

Conference paper

Soto-Crespo JM, Devine N, Hoffmann NP, Akhmediev Net al., 2014, Double peak rogue waves of the Sasa-Satsuma equation in a chaotic wave field

We study the properties of the chaotic wave fields generated in the frame of the Sasa-Satsuma equation, and analyze the presence of rogue waves in them. Our results also reveal the reason for the skewed profile of the exact rogue wave solutions.

Conference paper

Hadjihosseini A, Peinke J, Hoffmann NP, 2014, Stochastic analysis of ocean wave states with and without rogue waves, NEW JOURNAL OF PHYSICS, Vol: 16, ISSN: 1367-2630

Journal article

Chabchoub A, Kimmoun O, Branger H, Kharif C, Hoffmann N, Onorato M, Akhmediev Net al., 2014, Gray solitons on the surface of water, PHYSICAL REVIEW E, Vol: 89, ISSN: 2470-0045

Journal article

Weiss C, Morlock MM, Hoffmann NP, 2014, Friction induced dynamics of ball joints: Instability and post bifurcation behavior, EUROPEAN JOURNAL OF MECHANICS A-SOLIDS, Vol: 45, Pages: 161-173, ISSN: 0997-7538

Journal article

Soto-Crespo JM, Devine N, Hoffmann NP, Akhmediev Net al., 2014, Double peak rogue waves of the Sasa-Satsuma equation in a chaotic wave field

We study the properties of the chaotic wave fields generated in the frame of the Sasa-Satsuma equation, and analyze the presence of rogue waves in them. Our results also reveal the reason for the skewed profile of the exact rogue wave solutions. © 2014 OSA.

Conference paper

Soto-Crespo JM, Devine N, Hoffmann NP, Akhmediev Net al., 2014, Double peak rogue waves of the Sasa-Satsuma equation in a chaotic wave field

We study the properties of the chaotic wave fields generated in the frame of the Sasa-Satsuma equation, and analyze the presence of rogue waves in them. Our results also reveal the reason for the skewed profile of the exact rogue wave solutions.

Conference paper

Soto-Crespo JM, Devine N, Hoffmann NP, Akhmediev Net al., 2014, Double peak rogue waves of the Sasa-Satsuma equation in a chaotic wave field

We study the properties of the chaotic wave fields generated in the frame of the Sasa-Satsuma equation, and analyze the presence of rogue waves in them. Our results also reveal the reason for the skewed profile of the exact rogue wave solutions. © 2014 OSA.

Conference paper

Soto-Crespo JM, Devine N, Hoffmann NP, Akhmediev Net al., 2014, Double peak rogue waves of the Sasa-Satsuma equation in a chaotic wave field

We study the properties of the chaotic wave fields generated in the frame of the Sasa-Satsuma equation, and analyze the presence of rogue waves in them. Our results also reveal the reason for the skewed profile of the exact rogue wave solutions. © 2014 OSA.

Conference paper

Kruse S, Stingl B, Hieke J, Papangelo A, Tiedemann M, Hoffmann N, Ciavarella Met al., 2014, The influence of loading conditions on the static coefficient of friction: A study on brake creep groan, Pages: 149-160, ISSN: 2191-5644

This work focuses on the phenomenon of creep groan in brake systems as a problem leading to customer complaints (Kinkaid et al., J Sound Vib 267:105–166, 2003). It is potentially induced by a stick-slip phenomenon in the friction interface, but the dynamics are not well understood yet. This work tries to contribute to the understanding of the excitation mechanisms, the interaction of different length scales and possible measures to influence the phenomenon. It presents a dual—based on simulation and experiment—approach to investigate the phenomenon employing works of Ben-David and Fineberg (Phys Rev Lett 106, 2011) and Bar Sinai et al. (Geophys Res Lett 39, 2011). On the one side using the approach of Bar Sinai et al. (Geophys Res Lett 39, 2011) a one-dimensional simulation model is built up based on the contact state evolution of a representative brake pad and disc couple. This model is used to describe the interface dynamics while taking into account the surrounding simplified loading geometry. Parallel to this approach an experimental setup with a simplified disc brake is built up. As the simulation model allows to predict the level of the average static friction coefficient for different load cases, the simple test setup allows a validation. The experimental results show that the static friction coefficient can be systematically changed by modification of the loading geometry while one still observes the perturbing influence of uncontrolled process parameters.

Conference paper

Kruse S, Hoffmann N, 2014, On the robustness of mode-coupling instabilities in friction induced systems, IEEE Global Communications Conference (GLOBECOM), Publisher: IEEE, Pages: 2939-2944, ISSN: 1930-529X

Conference paper

Schwingshackl CW, Joannin C, Pesaresi L, Green JS, Hoffmann Net al., 2014, Test method development for nonlinear damping extraction of dovetail joints, ISSN: 2191-5644

The traditional measurement techniques to acquire the linear dynamic response of a single component are well established and have been in use for many decades to provide reliable input data for model updating. The measurement of assembled structures normally follows a very similar approach, although the presence of joints can introduce a nonlinear dynamic behaviour, which impacts the measurement results. Applying traditional linear test methods to a highly nonlinear structure, such as a dovetail joint in an aircraft engine blade-disk connection, does not necessarily take the special features of the nonlinear response into account and may lead to unreliable data. This is particularly true, if modal information such as damping are required. The influence of the measurement setup and the test procedures must be well understood for an accurate measurement. In this paper the influence of the different measurement components on a simple clamped beam and a compressor blade dove tail test rig will be investigated. A particular focus will be on the support of the test rig, the location and control of the excitation and the influence of the accelerometer on the response. Based on the findings an approach will be recommended that allows a reliable measurement of the dynamic behaviour of this heavily nonlinear structure.

Conference paper

Tiedemann M, Graebner N, Hoffmann NP, von Wagner Uet al., 2014, Nonlinearities in friction brake NVH – Experimental and Numerical studies., SAE Braking

Conference paper

Hoffmann NP, Bechthold J, Ziemer G, Evers K-U, Jochmann Pet al., 2014, Study of Local Ice Pressure Distribution on a Cylindrical Offshore Structure by Using Tactile Sensors., 22nd IAHR International Symposium on Ice

Conference paper

Tiedemann M, Kruse S, Hoffmann NP, 2014, Impact of joints on the dynamic behaviour of brake systems., Eurobrake 2014

Conference paper

Chabchoub A, Peric R, Hoffmann NP, 2014, Dynamics of unstable Stokes waves: a numerical and experimental study., OMAE

Conference paper

Kruse S, Hoffmann NP, 2013, On the Robustness of Instabilities in Friction-Induced Vibration, JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME, Vol: 135, ISSN: 1048-9002

Journal article

Fan N, Morlock MM, Bishop NE, Huber G, Hoffmann N, Ciavarella M, Chen GX, Hothan A, Witt Fet al., 2013, The influence of stem design on critical squeaking friction with ceramic bearings, JOURNAL OF ORTHOPAEDIC RESEARCH, Vol: 31, Pages: 1627-1632, ISSN: 0736-0266

Journal article

Chabchoub A, Hoffmann N, Branger H, Kharif C, Akhmediev Net al., 2013, Experiments on wind-perturbed rogue wave hydrodynamics using the Peregrine breather model, PHYSICS OF FLUIDS, Vol: 25, ISSN: 1070-6631

Journal article

Hothan A, Lewerenz K, Weiss C, Hoffmann N, Morlock M, Huber Get al., 2013, Vibration transfer in the ball-stem contact interface of artificial hips, MEDICAL ENGINEERING & PHYSICS, Vol: 35, Pages: 1513-1517, ISSN: 1350-4533

Journal article

Chabchoub A, Hoffmann N, Onorato M, Genty G, Dudley JM, Akhmediev Net al., 2013, Hydrodynamic Supercontinuum, PHYSICAL REVIEW LETTERS, Vol: 111, ISSN: 0031-9007

Journal article

Slunyaev A, Pelinovsky E, Sergeeva A, Chabchoub A, Hoffmann N, Onorato M, Akhmediev Net al., 2013, Super-rogue waves in simulations based on weakly nonlinear and fully nonlinear hydrodynamic equations, PHYSICAL REVIEW E, Vol: 88, ISSN: 2470-0045

Journal article

Stingl B, Ciavarella M, Hoffmann N, 2013, Frictional dissipation in elastically dissimilar oscillating Hertzian contacts, International Journal of Mechanical Sciences, Vol: 72, Pages: 55-62, ISSN: 0020-7403

Journal article

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