Development of Circuits for Excitation and Reception in Ultrasonic Transducers for Generation of Guided Waves in Hollow Cylinders for Fouling Detection

Silva, Jaidilson Jó da; Wanzeller, M.G.; Farias, P. de Almeida; Neto, José Sérgio da Rocha

doi:10.1109/tim.2008.915480

Cited by 2 publications

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“…The presence of fouling in the pipe results in corrosion, blockage, rupture and deformation which leads to substantial increase in operation cost and contamination of products. Pipe inspection can be done by involving ultrasonic guided waves Withers, 1994;Mc Cements, 1995;Hay & Rose, 2003;Lohr & Rose, 2003;da Silva et al, 2005;da Silva et al, 2007b). This technique which is capable of long range identification with great reliability, has been shown to identify not only fouling but also particular defects in pipes.…”

Section: Application Of Ultrasonicsmentioning

confidence: 99%

Advances in applications of non-destructive testing (NDT): a review

Gupta

Khan

2021

irjeis

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Manufacturing defects and discontinuities in a product are anomalies which can lead to severe damages which may sometimes involve loss of life. These defects must be examined and corrected before the product goes into service. There are two methods of testing a product for defects and discontinuities viz. Destructive Testing and Non-Destructive Testing. Destructive Testing entails subjecting the product to conditions that leads to failure of the product whereas Non-Destructive Testing (NDT) is the process of examining the products for defects in a way in which it retains its usefulness for future service. This paper discusses various methods involved in NDT such as Visual Testing, Magnetic Particle Inspection, Penetrant Testing, Ultrasonic Testing, Radiographic Testing, Acoustic Emission and Eddy Current Testing with a major focus on advances in the applications of NDT.

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Section: Application Of Ultrasonicsmentioning

confidence: 99%

Advances in applications of non-destructive testing (NDT): a review

Gupta

Khan

2021

irjeis

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“…This amplitude guarantees a minimum level of received signal (in the mV range), for smaller amplitude the received signal is too low to excite the receiver transducer. This frequency is necessary to guarantee the generation of the guided waves, once the propagation speed in the galvanized iron is known (4600 m/s) and the wavelength should be larger or equal than the pipe wall thickness (2.0 mm) (Silva et al, 2005).…”

Section: Proposed Systemmentioning

confidence: 99%

“…Duct systems and pipelines thus require regular and periodic inspection. Several methods have been proposed for early fouling detection in ducts, based on mass flow reduction (Krisher, 2003), electric resistance (Panchal, 1997) and ultrasonic techniques (Silva et al, 2005), (Lohr & Rose, 2002).…”

Section: Introductionmentioning

confidence: 99%

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Systems Structure and Control

Hušek¹

2008

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The title of the book System, Structure and Control encompasses broad field of theory and applications of many different control approaches applied on different classes of dynamic systems. Output and state feedback control include among others robust control, optimal control or intelligent control methods such as fuzzy or neural network approach, dynamic systems are e.g. linear or nonlinear with or without time delay, fixed or uncertain, onedimensional or multidimensional. The applications cover all branches of human activities including any kind of industry, economics, biology, social sciences etc. Naturally it is not purpose of this book in few chapters neither to provide a comprehensive survey of all the above mentioned disciplines nor to give a detailed study of any of them. Nevertheless, the following 11 chapters demonstrate that even today after several decades of intensive effort of many researchers and practitioners the area of control of dynamic systems still brings new challenging problems and produces solutions of many of them.The brief outline of the volume is as follows.In chapter 1 a new method for design of state-derivative feedback control of linear systems is presented. State-derivative feedback can be considered as a generalization of classical state feedback in those applications where state derivative is easier to obtain then the direct state, e.g. in vibration attenuation control of many mechanical systems including car suspension systems, bridge cables or landing gear components. In the contribution an extension of known methods for descriptor systems with polytopic parameter uncertainty is presented.Chapter 2 is concerned with the problem of stability analysis of linear systems with time delays. Such systems naturally occur very often, e.g. in network control or remote control via satellite. Time-delayed systems are of great interest for many decades but still many questions remain unanswered or achieved results are too conservative. Here an improved time-domain delay-dependent (i.e. taking into account the magnitude of time delay) approach result for both continuous and discrete time systems is presented. The obtained result is also applied on stability analysis of large scale systems.The problem of state observation of nonlinear systems using differential neural network is addressed in chapter 3. State observation is very important in those applications where we would like to use the advantages of state feedback but the states are not accessible. Many different techniques have been already used to solve the problem. In the contribution approximation properties of a class of dynamic neural networks are used for state observation of uncertain nonlinear systems affected by bounded external perturbations.In chapter 4 sliding mode control is designed and applied on control of electric power systems. Such systems are modeled as complex large-scale systems which are difficult to control. Sliding mode control is one of the most used and effective control approaches to nonlinear systems, especiall...

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Development of Circuits for Excitation and Reception in Ultrasonic Transducers for Generation of Guided Waves in Hollow Cylinders for Fouling Detection

Cited by 2 publications

References 0 publications

Advances in applications of non-destructive testing (NDT): a review

Advances in applications of non-destructive testing (NDT): a review

Systems Structure and Control

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