Imperial College London
Portrait Picture

ProfessorPeterCawley

Faculty of Engineering, Department of Mechanical Engineering

Professor of Mechanical Engineering
 
 
 
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Contact

 

+44 (0)20 7594 7069p.cawley CV

 
 
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Assistant

 

Ms Nina Hancock +44 (0)20 7594 7068

 
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Location

 

568City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

520 results found

Escobar-Ruiz E, Ruiz A, Hassan W, Wright DC, Collison IJ, Cawley P, Nagy PBet al., 2014, Non-linear Ultrasonic NDE of Titanium Diffusion Bonds, JOURNAL OF NONDESTRUCTIVE EVALUATION, Vol: 33, Pages: 187-195, ISSN: 0195-9298

Journal article

Attarian VA, Cegla FB, Cawley P, 2014, Long-term stability of guided wave structural health monitoring using distributed adhesively bonded piezoelectric transducers, STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL, Vol: 13, Pages: 265-280, ISSN: 1475-9217

Journal article

Brierley N, Tippetts T, Cawley P, 2014, Improving the Reliability of Automated Non-Destructive Inspection, 10th International Conference on Barkhausen and Micro-Magnetics (ICBM), Publisher: American Institute of Physics (AIP), Pages: 1912-1919, ISSN: 1551-7616

In automated NDE a region of an inspected component is often interrogated several times, be it within a single data channel, across multiple channels or over the course of repeated inspections. The systematic combination of these diverse readings is recognized to provide a means to improve the reliability of the inspection, for example by enabling noise suppression. Specifically, such data fusion makes it possible to declare regions of the component defect-free to a very high probability whilst readily identifying indications. Registration, aligning input datasets to a common coordinate system, is a critical pre-computation before meaningful data fusion takes place. A novel scheme based on a multiobjective optimization is described. The developed data fusion framework, that is able to identify and rate possible indications in the dataset probabilistically, based on local data statistics, is outlined. The process is demonstrated on large data sets from the industrial ultrasonic testing of aerospace turbine disks, with major improvements in the probability of detection and probability of false call being obtained.

Conference paper

Galvagni A, Cawley P, 2014, Reliable identification of damage growth using guided wave SHM systems, Pages: 1720-1727

A practical guided wave SHM system will be interrogated frequently and this will generate a large volume of data that must be processed. This paper discusses the use of sequential analysis to assess whether a change has occurred and whether it is of a form consistent with damage growth, rather than environmental changes. A methodology based on the generalised likelihood ratio (GLR) algorithm is introduced and applied to the guided wave monitoring of an 8 inch diameter pipe loop which is subjected to temperature cycling and the introduction of damage at different locations along the pipe. It is shown that the GLR algorithm can be used to process the signals automatically and to identify damage at specified probability of detection (POD) and probability of false alarm (PFA) rates. It is possible to detect damage corresponding to 0.25% cross section area loss in regions remote from features and to 0.5-0.75% loss at other locations. The methodology promises to be an important tool in the practical implementation of guided wave SHM.

Conference paper

Corcoran J, Davies C, Nagy P, Cawley Pet al., 2014, POTENTIAL DROP STRAIN SENSOR FOR CREEP MONITORING, ASME 2014 Pressure Vessels and Piping Conference (PVP-2014), Publisher: AMER SOC MECHANICAL ENGINEERS

Conference paper

Corcoran J, Cawley P, Nagy PB, 2014, A Potential Drop Strain Sensor for In-Situ Power Station Creep Monitoring, 10th International Conference on Barkhausen and Micro-Magnetics (ICBM), Publisher: AMER INST PHYSICS, Pages: 1482-1487, ISSN: 0094-243X

Conference paper

Huthwaite P, Ribichini R, Lowe MJS, Cawley Pet al., 2014, Lamb Mode Selection for Accurate Wall Loss Estimation via Guided Wave Tomography, 10th International Conference on Barkhausen and Micro-Magnetics (ICBM), Publisher: AMER INST PHYSICS, Pages: 193-200, ISSN: 0094-243X

Conference paper

Seher M, Huthwaite P, Lowe M, Nagy P, Cawley Pet al., 2014, Numerical Design Optimization of an EMAT for A0 Lamb Wave Generation in Steel Plates, 10th International Conference on Barkhausen and Micro-Magnetics (ICBM), Publisher: AMER INST PHYSICS, Pages: 340-347, ISSN: 0094-243X

Conference paper

Leinov E, Cawley P, Lowe MJS, 2014, Investigation of Guided Waves Propagation in Pipe Buried in Sand, 10th International Conference on Barkhausen and Micro-Magnetics (ICBM), Publisher: AMER INST PHYSICS, Pages: 271-278, ISSN: 0094-243X

Conference paper

Ptaszek G, Cawley P, Almond D, Pickering Set al., 2013, Transient thermography testing of unpainted thermal barrier coating (TBC) systems, NDT & E INTERNATIONAL, Vol: 59, Pages: 48-56, ISSN: 0963-8695

Journal article

Cawley P, Cegla F, Stone M, 2013, Corrosion Monitoring Strategies-Choice Between Area and Point Measurements, JOURNAL OF NONDESTRUCTIVE EVALUATION, Vol: 32, Pages: 156-163, ISSN: 0195-9298

Journal article

Huthwaite P, Ribichini R, Cawley P, Lowe MJSet al., 2013, Mode Selection for Corrosion Detection in Pipes and Vessels via Guided Wave Tomography, IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, Vol: 60, Pages: 1165-1177, ISSN: 0885-3010

Journal article

Ptaszek G, Cawley P, Almond D, Pickering Set al., 2013, Transient thermography testing of unpainted thermal barrier coating surfaces, Pages: 571-578, ISSN: 0094-243X

This paper has investigated the effects of uneven surface discolouration of a thermal barrier coating (TBC) and of its IR translucency on the thermal responses observed by using mid and long wavelength IR cameras. It has been shown that unpainted blades can be tested satisfactorily by using a more powerful flash heating system and a long wavelength IR camera. The problem of uneven surface emissivity can be overcome by applying 2 nd derivative processing of the log-log surface cooling curves.

Conference paper

Cawley P, 2013, A problem-based module in mechanical engineering, The Challenge of Problem-based Learning, Pages: 185-193, ISBN: 9780749425609

The course described in this chapter is a final-year option on vibration in an honours mechanical engineering degree programme. I had pre- viously taught the subject for several years as a conventional lecture course and, although the student response to the course was satisfac- tory, I was concerned that there was too much emphasis on technical theory and too little stress on the application of the material to real engineering problems. It was noticeable that in the examination, the students tended to aVold questions requiring the type of diag- nostic and problem-solving skills which are essential to engineering practice.

Book chapter

Corcoran J, Cawley P, Nagy PB, 2013, A potential drop strain sensor for in-situ power station creep monitoring, Pages: 172-179

Creep is a high temperature damage mechanism of interest to the power industry and at present lacks a satisfactory inspection technique. Existing material inspection techniques are extremely laborious while strain measurements rely on often infrequent off-load measurements. A quasi-DC directional potential drop technique has been suggested that is able to suppress the effects of permeability and is primarily sensitive to changes in resistivity and also the geometry that will develop through strain. The change in creep related resistivity is shown by an equivalent effective resistivity approach to be small at <1% change when compared to the >100% change in transfer resistance that occurs due to strain as observed in laboratory tests. A biaxial inversion is then presented and demonstrated on in-lab samples showing good performance. The result is a sensor that performs as a very robust high temperature strain gauge. © (2013) by the British Institute of Non-Destructive Testing. All rights reserved.

Conference paper

Brierley N, Tippetts T, Cawley P, 2013, Improving the reliability of automated non-destructive inspection, Pages: 279-289

In automated NDE a region of an inspected component is often interrogated several times, be it within a single data channel, across multiple channels or over the course of repeated inspections. The systematic combination of these diverse readings is recognized to provide a means to improve the reliability of the inspection, for example by enabling noise suppression. Specifically, such data fusion makes it possible to declare regions of the component defect-free to a very high probability whilst readily identifying indications. Registration, aligning input datasets to a common coordinate system, is a critical pre-computation before meaningful data fusion takes place. A novel scheme based on a multi-objective optimization is described. The developed data fusion framework, that is able to identify and rate possible indications in the dataset probabilistically, based on local data statistics, is outlined. The process is demonstrated on large data sets from the industrial ultrasonic testing of aerospace turbine disks, with major improvements in the probability of detection and probability of false call being obtained. © (2013) by the British Institute of Non-Destructive Testing. All rights reserved.

Conference paper

Karaiskos E, Cawley P, Vogt T, 2013, Guided wave propagation in an elastic hollow cylinder coated with viscoelastic materials of varying thickness, Pages: 145-156

The propagation of ultrasonic guided waves in an elastic hollow cylinder coated with viscoelastic materials of varying thickness is studied. The principal motivation is to improve the range of practical guided wave testing for the non-destructive inspection of coated steel pipes. The dispersion curve characteristics of such a system are examined, with particular focus on the differences to the free case due to the presence of bi-layer modes. Particularly, for every propagating mode, several cut-of frequencies of high attenuation are identified; The location of these attenuation peaks are shown to be directly related to the acoustic material properties and the thickness of the coating. It is demonstrated that in the case of coated pipes careful selection of both the excitation mode family (torsional or longitudinal) and the testing frequency is necessary in order to improve the range of practical guided wave testing. It is also shown that when for a given pipe the coating is not of uniform thickness, along the propagating direction, high attenuation is observed for all frequencies above some cut-off. The theoretical predictions are compared to experimental results with a good match being achieved. © (2013) by the British Institute of Non-Destructive Testing. All rights reserved.

Conference paper

Galvagni A, Cawley P, 2013, PERMANENTLY INSTALLED GUIDED WAVE PIPELINE MONITORING, 39th Annual Review of Progress in Quantative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, Pages: 159-166, ISSN: 0094-243X

Conference paper

Escobar-Ruiz E, Cawley P, Nagy PB, Collison I, Wright Det al., 2013, ULTRASONIC NDE OF TITANIUM DIFFUSION BONDS USING SIGNAL PHASE, 39th Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, Pages: 1409-1416, ISSN: 0094-243X

Conference paper

Attarian V, Cegla F, Cawley P, 2013, Long Term Stability of Guided Wave Structural Health Monitoring Using Distributed Adhesively Bonded Piezoelectric Transducers, 9th International Workshop on Structural Health Monitoring (IWSHM), Publisher: DESTECH PUBLICATIONS, INC, Pages: 2202-2209

Conference paper

Cegla F, Jarvis A, Gajdacsi A, Cavvley Pet al., 2013, Continuous Thickness Monitoring - Experience from the Field and Lessons Learned, 9th International Workshop on Structural Health Monitoring (IWSHM), Publisher: DESTECH PUBLICATIONS, INC, Pages: 2194-2201

Conference paper

Attarian V, Cegla F, Cawley P, 2013, LONG TERM STABILITY AND EXPECTED PERFORMANCE OF A GUIDED WAVE SHM SYSTEM, 39th Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, Pages: 270-277, ISSN: 0094-243X

Conference paper

Huthwaite P, Ribichini R, Simonetti F, Cawley P, Lowe MJSet al., 2013, HIGH RESOLUTION GUIDED WAVE TOMOGRAPHY, 39th Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, Pages: 729-736, ISSN: 0094-243X

Conference paper

Tippetts T, Brierley N, Cawley P, 2013, DATA REGISTRATION FOR AUTOMATED NON-DESTRUCTIVE INSPECTION WITH MULTIPLE DATA SETS, 39th Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, Pages: 1773-1780, ISSN: 0094-243X

Conference paper

Ptaszek G, Cawley P, Almond D, Pickering Set al., 2013, TRANSIENT THERMOGRAPHY TESTING OF UNPAINTED THERMAL BARRIER COATING SURFACES, 39th Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, Pages: 571-578, ISSN: 0094-243X

Conference paper

Brierley N, Tippetts T, Cawley P, 2013, DATA FUSION FOR IMPROVING THE RELIABILITY OF AUTOMATED NON-DESTRUCTIVE INSPECTION, 39th Annual Review of Progress in Quantative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, Pages: 1781-1788, ISSN: 0094-243X

Conference paper

Mirnezami M, Cawley P, Finch JA, 2012, Comparison of electrokinetic behaviour of pentlandite from various sources, Pages: 3412-3418

Pentlandite samples were obtained as Ni concentrate from three Canadian plants and one specimen sample from Ward's Scientific Establishment. The samples were upgraded using gravity and magnetic separation techniques. Nickel concentration was determined by atomic absorption spectroscopy. Microprobe analysis identified a range in Co and Cu lattice substitutions. All samples exhibited similar zeta potential-pH trend with isoelectric points from 2 to 3, and similar responses to copper activation and addition of xanthate. The similar trends indicate that the variations in lattice substitution identified have no significant effect on electrokinetic properties; that is, samples from any source likely yield results that can be generalized.

Conference paper

Cawley P, Cegla F, Galvagni A, 2012, Guided waves for NDT and permanently-installed monitoring, INSIGHT, Vol: 54, Pages: 594-601, ISSN: 1354-2575

Journal article

Carandente R, Lovstad A, Cawley P, 2012, The influence of sharp edges in corrosion profiles on the reflection of guided waves, NDT & E INTERNATIONAL, Vol: 52, Pages: 57-68, ISSN: 0963-8695

Journal article

Lowe MJ, Cawley P, Galvagni A, 2012, Monitoring of corrosion in pipelines using guided waves and permanently installed transducers., J Acoust Soc Am, Vol: 132

Guided Wave Testing (GWT) of pipelines for the detection of corrosion has been developed over about 20 years and is now a well established method worldwide, used mostly in the oil and gas industry. The established approach is as a screening tool: GWT is used to detect the presence of significant reflectors which are then examined locally in detail using conventional methods of NDE. To date most of the equipment has been developed for deployment solely at the time of test. However recent developments include permanently-attached transducers which can be left in place after testing, for example to allow easier access for future testing at difficult locations such as buried pipes. This is enabling a new approach, in which improved sensitivity may be achieved by detecting changes with respect to earlier reference signals, and also continuous monitoring which may follow degradation during service. The presentation will include a summary of the GWT method and discussion of current research for monitoring.

Journal article

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