Imperial College London

DrPeterHuthwaite

Faculty of EngineeringDepartment of Mechanical Engineering

Lecturer
 
 
 
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p.huthwaite Website

 
 
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568City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
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43 results found

Eckel S, Huthwaite P, Lowe M, Schumm A, Guérin Pet al., 2018, Establishment and validation of the Channelized Hotelling Model Observer for image assessment in industrial radiography, NDT and E International, Vol: 98, Pages: 1-7, ISSN: 0963-8695

© 2018 The Authors A new method for industrial radiography is presented to assess image quality objectively. The assessment is performed by a modelled observer developed to interpret radiographic images in order to rate the detectability of structural defects. For the purpose of qualifying radiographic NDE procedures, computational tools simulate the image, but should additionally automatically assess the associated image quality instead of relying on human interpretation. The Channelized Hotelling Model Observer (CHO) approach, originally developed for medical imaging, is here developed for industrial NDE applications to measure objectively the defect's detectability. A validation study based on a comparison of the model's efficiency of observing circular and elongated flaws shows that the CHO outperforms other detectability models used by industry. Furthermore, the model's reliability was verified by comparing it to psychophysical data.

JOURNAL ARTICLE

Jones GA, Huthwaite P, 2018, Limited view X-ray tomography for dimensional measurements, NDT & E INTERNATIONAL, Vol: 93, Pages: 98-109, ISSN: 0963-8695

JOURNAL ARTICLE

Phillips R, Duxbury D, Huthwaite P, Lowe Met al., 2018, Simulating the ultrasonic scattering from complex surface-breaking defects with a three-dimensional hybrid model, NDT and E International, Vol: 97, Pages: 32-41, ISSN: 0963-8695

© 2018 Elsevier Ltd Modelling is increasingly relied on for the design and qualification of ultrasonic inspections applied to safety-critical components. Numerical methods enable the simulation of the ultrasonic interaction with realistic defect morphologies; however, the computational requirements often limit their deployment. The hybrid simulation technique, which combines semi-analytical and numerical methods, realises the potential of high fidelity numerical modelling without the limiting computational factors. The inspection of thick section components for near-backwall surface-breaking defects results in large propagation distances, making them a key application of hybrid modelling. This work presents a methodology for efficiently simulating the ultrasonic inspection of complex surface-breaking defects using a hybrid model. The model is initially verified against full numerical simulation; further validation is presented by comparison to an experimental scan over an artificially machined surface-breaking notch. The potential of the new hybrid method is then demonstrated by carrying out a Monte Carlo analysis on the scattered field from surface-breaking defects with randomly rough surfaces and the results are compared to the Kirchhoff approximation.

JOURNAL ARTICLE

Shi F, Huthwaite P, 2018, Ultrasonic wave-speed diffraction tomography with undersampled data using virtual transducers, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, ISSN: 0885-3010

IEEE Ultrasonic diffraction tomography (DT) offers a way to achieve high-resolution imaging of the wavespeed map, and hence has strong potential applications in medical diagnosis and Nondestructive evaluation (NDE). Ideal images can be obtained with a complete array of sensors surrounding the scatterer, provided that the measurement data are fully sampled in space, obeying the Nyquist criterion. Spatial undersampling causes the image to be distorted and introduce unwanted circular artefacts. In this paper we propose an iteration approach using virtual transducers to achieve high-resolution tomographic imaging with undersampled measurements. At each iteration stage, the extent constraint estimated from the shape of the object of interest is applied on the image space to obtain a regularized image, based on which the ultrasonic measurement data at virtual transducers are calculated using a forward model. The full dataset composed of original and virtual measurements is then used for tomography in the next stage. A final image with sufficiently high resolution is obtained after only a few iterations. The new imaging method yields improvements in the robustness and accuracy of ultrasonic tomography with undersampled data.We present numerical results using complicated wavespeed maps from realistic corrosion profiles. In addition, an experiment using guided ultrasonic waves is performed to further evaluate the imaging method.

JOURNAL ARTICLE

Zhang C, Huthwaite P, Lowe M, 2018, The Application of the Factorization Method to the Subsurface Imaging of Surface-Breaking Cracks, IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, Vol: 65, Pages: 497-512, ISSN: 0885-3010

JOURNAL ARTICLE

Egerton JS, Lowe MJS, Huthwaite P, Halai HVet al., 2017, Ultrasonic attenuation and phase velocity of high-density polyethylene pipe material, JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, Vol: 141, Pages: 1535-1545, ISSN: 0001-4966

JOURNAL ARTICLE

Egerton JS, Lowe MJS, Huthwaite P, Halai HVet al., 2017, A multiband approach for accurate numerical simulation of frequency dependent ultrasonic wave propagation in the time domain, JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, Vol: 142, Pages: 1270-1280, ISSN: 0001-4966

JOURNAL ARTICLE

Haith MI, Ewert U, Hohendorf S, Bellon C, Deresch A, Huthwaite P, Lowe MJS, Zscherpel Uet al., 2017, Radiographic modelling for NDE of subsea pipelines, NDT & E INTERNATIONAL, Vol: 86, Pages: 113-122, ISSN: 0963-8695

JOURNAL ARTICLE

Haith MI, Huthwaite P, Lowe MJS, 2017, Defect characterisation from limited view pipeline radiography, NDT & E INTERNATIONAL, Vol: 86, Pages: 186-198, ISSN: 0963-8695

JOURNAL ARTICLE

Egerton JS, Lowe MJS, Halai HV, Huthwaite Pet al., 2016, Improved FE Simulation of Ultrasound in Plastics, 42nd Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, ISSN: 0094-243X

CONFERENCE PAPER

Ewert U, Tschaikner M, Hohendorf S, Bellon C, Haith MI, Huthwaite P, Lowe MJSet al., 2016, Corrosion Monitoring with Tangential Radiography and Limited View Computed Tomography, 42nd Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, ISSN: 0094-243X

CONFERENCE PAPER

Haith MI, Ewert U, Hohendorf S, Bellon C, Deresch A, Huthwaite P, Lowe MJS, Zscherpel Uet al., 2016, Modelling Based Radiography for NDE of Subsea Pipelines, 42nd Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, ISSN: 0094-243X

CONFERENCE PAPER

Huthwaite P, 2016, Improving accuracy through density correction in guided wave tomography, PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, Vol: 472, ISSN: 1364-5021

JOURNAL ARTICLE

Huthwaite P, 2016, Guided wave tomography with an improved scattering model, PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, Vol: 472, ISSN: 1364-5021

JOURNAL ARTICLE

Huthwaite P, 2016, Eliminating incident subtraction in diffraction tomography, PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, Vol: 472, ISSN: 1364-5021

JOURNAL ARTICLE

Huthwaite P, Lowe M, Cawley P, 2016, Guided Wave Tomography Performance Analysis, 42nd Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, ISSN: 0094-243X

CONFERENCE PAPER

Seher M, Huthwaite P, Lowe MJS, 2016, Experimental Studies of the Inspection of Areas With Restricted Access Using A0 Lamb Wave Tomography, IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, Vol: 63, Pages: 1455-1467, ISSN: 0885-3010

JOURNAL ARTICLE

Van Pamel A, Huthwaite P, Brett CR, Lowe MJSet al., 2016, Finite Element Modelling of Wave Propagation in Highly Scattering Materials, 42nd Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, ISSN: 0094-243X

CONFERENCE PAPER

Van Pamel A, Huthwaite P, Brett CR, Lowe MJSet al., 2016, Numerical simulations of ultrasonic array imaging of highly scattering materials, NDT & E INTERNATIONAL, Vol: 81, Pages: 9-19, ISSN: 0963-8695

JOURNAL ARTICLE

Huthwaite P, Seher M, 2015, Robust Helical Path Separation for Thickness Mapping of Pipes by Guided Wave Tomography, IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, Vol: 62, Pages: 927-938, ISSN: 1525-8955

Pipe wall loss caused by corrosion can be quantifiedacross an area by transmitting guided Lamb waves throughthe region and measuring the resulting signals. Typically thedispersive relationship for these waves, which means thatwave velocity is a known function of thickness, is exploited,enabling the wall thickness to be determined from a velocityreconstruction. The accuracy and quality of this reconstructionis commonly limited by the angle of view available from thetransducer arrays. These arrays are often attached as a pairof ring arrays on either side of the inspected region, and dueto the cylindrical nature of the pipe, waves are able to travelin an infinite number of helical paths between any two transducers.The first arrivals can be separated relatively easily bytime gating, but by using just these components the angle ofview is severely restricted. To improve the viewing angle, it isnecessary to separate the wavepackets. This paper provides anoutline of a separation approach: initially the waves are backpropagatedto their source to align the different signals, then afiltering technique is applied to select the desired components.The technique is applied to experimental data and demonstratedto robustly separate the signals

JOURNAL ARTICLE

Huthwaite P, Seher M, 2015, Helical Path Separation For Guided Wave Tomography, 41st Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, Pages: 761-770, ISSN: 0094-243X

CONFERENCE PAPER

Huthwaite P, Shi F, Van Pamel A, Lowe MJSet al., 2015, High-Speed GPU-Based Finite Element Simulations for NDT, 41st Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, Pages: 1815-1819, ISSN: 0094-243X

CONFERENCE PAPER

Seher M, Huthwaite P, Lowe M, Cawley Pet al., 2015, Experimental Study of A0 Lamb Wave Tomography, 41st Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, Pages: 245-253, ISSN: 0094-243X

CONFERENCE PAPER

Seher M, Huthwaite P, Lowe MJS, Nagy PBet al., 2015, Model-Based Design of Low Frequency Lamb Wave EMATs for Mode Selectivity, JOURNAL OF NONDESTRUCTIVE EVALUATION, Vol: 34, ISSN: 0195-9298

JOURNAL ARTICLE

Van Pamel A, Brett CR, Huthwaite P, Lowe MJSet al., 2015, Finite element modelling of elastic wave scattering within a polycrystalline material in two and three dimensions, JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, Vol: 138, Pages: 2326-2336, ISSN: 0001-4966

JOURNAL ARTICLE

Van Pamel A, Huthwaite P, Brett CR, Lowe MJSet al., 2015, A Finite Element Model Investigation of Ultrasonic Array Performance for Inspecting Polycrystalline Materials, 41st Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, Pages: 1007-1014, ISSN: 0094-243X

CONFERENCE PAPER

Gajdacsi A, Jarvis AJC, Huthwaite P, Cegla FBet al., 2014, Reconstruction of Temperature Distribution in a Steel Block Using an Ultrasonic Sensor Array, JOURNAL OF NONDESTRUCTIVE EVALUATION, Vol: 33, Pages: 458-470, ISSN: 0195-9298

JOURNAL ARTICLE

Huthwaite P, 2014, Accelerated finite element elastodynamic simulations using the GPU, JOURNAL OF COMPUTATIONAL PHYSICS, Vol: 257, Pages: 687-707, ISSN: 0021-9991

JOURNAL ARTICLE

Huthwaite P, 2014, Evaluation of inversion approaches for guided wave thickness mapping, PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, Vol: 470, ISSN: 1364-5021

JOURNAL ARTICLE

Cegla FB, Huthwaite PE, Lowe MJ, 2013, Inspection vs structural health monitoring: Manual ultrasonic thickness measurements compared to monitoring with permanently installed sensors., J Acoust Soc Am, Vol: 134

Corrosion is a major issue in industry and inspection and monitoring for wall thickness loss are important to assess the structural integrity of pipework and process vessels. Manual ultrasonic thickness measurements are widely used; however, they are also notoriously unreliable because of operator errors. Therefore, automated inspection scans and monitoring at fixed locations with permanently installed sensors are becoming more attractive; they help to remove some of the error introduced by operators. However, this raises the question of what the underlying uncertainties of automated ultrasonic wall thickness measurements are. A key contributor to the uncertainty is the surface roughness condition and the authors have been researching this topic for some time. This talk will give an overview of the physics of scattering of ultrasonic waves from rough corroded surfaces. The different scales of roughness will be discussed, and a simulation technique based on the Distributed Point Source Method (DPSM) to model the scattering and its experimental validation will be presented. The need for statistical results makes both the speed and accuracy of the simulation very important. Finally, based on the simulations, results of the estimated ultrasonic measurement errors due to roughness are presented.

JOURNAL ARTICLE

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