Effects of randomly rough surfaces on ultrasonic inspection

Bilgen, Mehmet

doi:10.31274/rtd-180813-10023

Cited by 3 publications

(7 citation statements)

References 19 publications

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“…They have concluded that the increase in surface roughness results in loss of ultrasonic signal amplitude and selection of equipment and probes are dependent on surface roughness and defects to be inspected. A similar study was carried out by Bilgen (10) in his doctoral research work on the effect of surface roughness on ultrasonic immersion testing in detail using a theoretical model. According to Bilgen (10) , only the coherent part of the ultrasonic wave field participates in focusing and it dominates the backscattered signal.…”

Section: Introductionmentioning

confidence: 86%

“…A similar study was carried out by Bilgen (10) in his doctoral research work on the effect of surface roughness on ultrasonic immersion testing in detail using a theoretical model. According to Bilgen (10) , only the coherent part of the ultrasonic wave field participates in focusing and it dominates the backscattered signal. Hence, in the focal region, the signal-to-noise ratio is relatively unaffected by surface roughness, as the signal and noise are altered in the same manner.…”

Section: Introductionmentioning

confidence: 86%

“…Appreciation of the problem has led to a large number of studies investigating various aspects of material characteristics on ultrasonic test signals (3)(4)(5)(6)(7)(8)(9) . From the literature, it is evident that the results obtained were based on theoretical or model-based studies (9)(10)(11)(12)(13)(14)(15)(16)(17)(18) .…”

Section: Introductionmentioning

confidence: 99%

“…Hence, in the focal region, the signal-to-noise ratio is relatively unaffected by surface roughness, as the signal and noise are altered in the same manner. However, for a surface roughness above 25 µm, the coherent part of the ultrasonic beam becomes negligible even in the focal area and a high loss in the signal-to-noise ratio results (10) . Focusing changes the backscattered signal and consequently attention must be given to select a suitable ultrasonic focus probe in order to accommodate the surface roughness variation.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Ultrasonic inspection of rough surface aluminium die castings

Palanisamy¹,

Nagarajah²,

Iovenitti³

2007

Insight - Non-Destructive Testing and Condition Monitoring

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Section: Introductionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ultrasonic inspection of rough surface aluminium die castings

Palanisamy¹,

Nagarajah²,

Iovenitti³

2007

Insight - Non-Destructive Testing and Condition Monitoring

View full text Add to dashboard Cite

“…For instance, the elastic Kirchhoff model has been devised to deal with rough defects [6][7][8] and to take into account mode-conversions between compressional and shear waves. A variety of analytical models involving reflection and transmission waves (for instance through a rough fluid-solid interface), such as the phase screen approximation [9][10][11][12] and Kirchhoff theory, have been developed to understand the elastic fields in solids or scattered from different embedded scatterers.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Scattering Models from Rough Surfaces: A Brief Review and Recent Advances

Darmon

Dorval

Baqué³

2020

Applied Sciences

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This paper proposes a brief review of acoustic wave scattering models from rough surfaces. This review is intended to provide an up-to-date survey of the analytical approximate or semi-analytical methods that are encountered in acoustic scattering from random rough surfaces. Thus, this review focuses only on the scattering of acoustic waves and does not deal with the transmission through a rough interface of waves within a solid material. The main used approximations are classified here into two types: the two historical approximations (Kirchhoff approximation and the perturbation theory) and some sound propagation models more suitable for grazing observation angles on rough surfaces, such as the small slope approximation, the integral equation method and the parabolic equation. The use of the existing approximations in the scientific literature and their validity are highlighted. Rough surfaces with Gaussian height distribution are usually considered in the models hypotheses. Rather few comparisons between models and measurements have been found in the literature. Some new criteria have been recently determined for the validity of the Kirchhoff approximation, which is one of the most used models, owing to its implementation simplicity.

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Chronic Pain and Pain Management in Older Adults

LaRowe,

Miaskowski,

Miller

et al. 2024

Nursing Research

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Background Chronic pain occurs in 30% of older adults. This prevalence rate is expected to increase, given the growth in the older adult population and the associated growth of chronic conditions contributing to pain. No population-based studies have provided detailed, longitudinal information on the experience of chronic pain in older adults, the pharmacologic and nonpharmacologic strategies that older adults use to manage their chronic pain, and the effect of chronic pain on patient-reported outcomes. Objectives This paper aims to describe the protocol for a population-based, longitudinal study focused on understanding the experience of chronic pain in older adults. The objectives are to determine the prevalence and characteristics of chronic pain; identify the pharmacologic and nonpharmacologic pain treatments used; evaluate for longitudinal differences in biopsychosocial factors; and examine how pain types and pain trajectories affect important patient-reported outcomes. Also included are the results of a pilot study. Methods A population-based sample of approximately 1,888 older adults will be recruited from the National Opinion Research Center at the University of Chicago’s AmeriSpeak® Panel to complete surveys at three waves: enrollment (Wave 1), 6 months (Wave 2), and 12 months (Wave 3). To determine the feasibility, a pilot test of the enrollment survey was conducted among 123 older adults. Results In the pilot study, older adults with chronic pain reported a range of pain conditions, with osteoarthritis being the most common. Participants reported an array of pharmacologic and nonpharmacologic pain strategies. Compared to participants without chronic pain, those with chronic pain reported lower physical and cognitive function and poorer quality of life. Data collection for the primary, longitudinal study is ongoing. Discussion This project will be the first longitudinal population-based study to examine the experience and overall effect of chronic pain in older adults. Pilot study results provide evidence of the feasibility of study methods. Ultimately, this work will inform the development of tailored interventions for older patients targeted to decrease pain and improve function and quality of life.

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Effects of randomly rough surfaces on ultrasonic inspection

Cited by 3 publications

References 19 publications

Ultrasonic inspection of rough surface aluminium die castings

Ultrasonic inspection of rough surface aluminium die castings

Acoustic Scattering Models from Rough Surfaces: A Brief Review and Recent Advances

Chronic Pain and Pain Management in Older Adults

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