Relevant bibliographies by topics / Pipe-like structures

Academic literature on the topic 'Pipe-like structures'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Pipe-like structures"

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Leonard, Kevin R., and Mark K. Hinders. "Lamb wave tomography of pipe-like structures." Ultrasonics 43, no. 7 (June 2005): 574–83. http://dx.doi.org/10.1016/j.ultras.2004.12.006.

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Okudan, Gorkem, Hrishikesh Danawe, Lu Zhang, Didem Ozevin, and Serife Tol. "Enhancing Acoustic Emission Characteristics in Pipe-Like Structures with Gradient-Index Phononic Crystal Lens." Materials 14, no. 6 (March 22, 2021): 1552. http://dx.doi.org/10.3390/ma14061552.

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Phononic crystals have the ability to manipulate the propagation of elastic waves in solids by generating unique dispersion characteristics. They can modify the conventional behavior of wave spreading in isotropic materials, known as attenuation, which negatively influences the ability of acoustic emission method to detect active defects in long-range, pipe-like structures. In this study, pipe geometry is reconfigured by adding gradient-index (GRIN) phononic crystal lens to improve the propagation distance of waves released by active defects such as crack growth and leak. The sensing element is designed to form a ring around the pipe circumference to capture the plane wave with the improved amplitude. The GRIN lens is designed by a special gradient-index profile with varying height stubs adhesively bonded to the pipe surface. The performance of GRIN lens for improving the amplitude of localized sources is demonstrated with finite element numerical model using multiphysics software. Experiments are conducted using pencil lead break simulating crack growth, as well as an orifice with pressured pipe simulating leak. The amplitude of the burst-type signal approximately doubles on average, validating the numerical findings. Hence, the axial distance between sensors can be increased proportionally in the passive sensing of defects in pipe-like geometries.
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Shah, Darshita, Jatin Dave, Ashish Majithiya, and Yash Patel. "Conceptual Design and Analysis of Pipe Climbing Robot." Journal of Physics: Conference Series 2115, no. 1 (November 1, 2021): 012004. http://dx.doi.org/10.1088/1742-6596/2115/1/012004.

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Abstract Robotics is one of the most emerging technologies in the current scenario. In this fast-growing technological world automation through robotics finds its place in almost all the fields. Climbing robots became more popular due to their versatile applications like inspection of tall buildings, tanks, structures, facade cleaning, fruits harvesting on tall trees (coconut) and many more. It became most adaptive as working on height may lead to dangerous incidents for human beings. Operations like visual inspection, crack detection of tall structures and pipes can be made possible with specially designed pipe climber robot. It finds its applications where human cannot reach, like hazardous applications. Specially design robots for a specific application also performs well with precision. This paper presents the novel design and analysis of pipe climbing robot for Chemical plant pipeline fault and leakage detection purpose. Design of all components of the robot is done with the basic mathematical consideration and then its analysis is carried out using FEA tools and MATLAB. Results of Forward and Inverse kinematic analysis of robot are obtained for certain specific points of trajectory. Dynamic analysis has been performed for motor selection and torque calculation. Presented conceptual design and analysis can be useful for pipe inspection purpose.
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Vappangi, Pradeep Kumar, and Naganjaneyulu Kasturi. "New Methodology in Interpretation of Aeromagnetic Anomalies over Pipe-Like Sources using Analytic Signal Ratio Approach." Trends in Sciences 19, no. 24 (November 18, 2022): 2119. http://dx.doi.org/10.48048/tis.2022.2119.

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Concepts of signal processing like Fourier transform, filtering, power spectrum, derivatives etc., are widely used in geophysical models in exploring the Earth structures. For example, quantitative interpretation of aeromagnetic maps is based mainly on choosing an appropriate model for evaluating parameters of the causative source. For circular or elliptical anomalies caused by plug-like intrusive sources, the vertical pipe of infinite depth extent (also known as single or mono pole) is most suited. It is also more common to use analytic signal maps in interpretation. For a vertical pipe, the total magnetic intensity (TMI) anomaly is anti-symmetric at the magnetic equator and progressively becomes symmetric at the pole. Based on this property, a new methodology is developed for identifying location and depth of magnetic structures beneath. It is concluded that the analytic signal is almost symmetric for any magnetic latitude and by using both the properties of the anomaly and its analytic signal the location and depth can be evaluated. This new approach is validated by field examples. HIGHLIGHTS The theory and application of using analytic signal to determine the location and depth to the point pole is described The method is useful in locating pipe-like (vertical cylinder, kimberlite pipes) structures The shape of the magnetic anomaly changes with magnetic inclination whereas the analytic signal map is symmetric and almost circular, with its maximum centred over the top of the pipe The analytic signal is almost symmetric for any magnetic latitude and by using both the properties of the anomaly and its analytic signal, the location and depth to the top can be evaluated GRAPHICAL ABSTRACT
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Chen, Xue Feng, Bing Li, and Zheng Jia He. "Crack Detection in Pipe Structures by Lifting Wavelet Finite Element Method." Key Engineering Materials 413-414 (June 2009): 143–50. http://dx.doi.org/10.4028/www.scientific.net/kem.413-414.143.

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Due to the fact that near a crack singularity, gradients of the solution are large and are also subject to abrupt changes, so that the solution cannot locally be accurately approximated by a piecewise polynomial function on a quasi-uniform mesh. Lifting wavelet finite element has good ability in modal analysis for singularity problems like a cracked pipe. The first three natural frequencies of the cracked pipe were solved with lifting wavelet finite element, and the database for crack diagnosis was obtained. The first three measured natural frequencies were employed as inputs and the intersection of the three frequencies contour lines predicted the normalized crack location and size. The experimental examples denote the method is of higher identification precision.
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Ergene, Berkay, İsmet ŞEKEROĞLU, Çağın Bolat, and Bekir Yalçın. "An experimental investigation on mechanical performances of 3D printed lightweight ABS pipes with different cellular wall thickness." Journal of Mechanical Engineering and Sciences 15, no. 2 (June 10, 2021): 8169–77. http://dx.doi.org/10.15282/jmes.15.2.2021.16.0641.

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In recent years, cellular structures have attracted great deal of attention of many researchers due to their unique properties like exhibiting high strength at low density and great energy absorption. Also, the applications of cellular structures (or lattice structures) such as wing airfoil, tire, fiber and implant, are mainly used in aerospace, automotive, textile and biomedical industries respectively. In this investigation, the idea of using cellular structures in pipes made of acrylonitrile butadiene styrene (ABS) material was focused on and four different pipe types were designed as honeycomb structure model, straight rib pattern model, hybrid version of the first two models and fully solid model. Subsequently, these models were 3D printed by using FDM method and these lightweight pipes were subjected to compression tests in order to obtain stress-strain curves of these structures. Mechanical properties of lightweight pipes like elasticity modulus, specific modulus, compressive strength, specific compressive strength, absorbed energy and specific absorbed energy were calculated and compared to each other. Moreover, deformation modes were recorded during all compression tests and reported as well. The results showed that pipe models including lattice wall thickness could be preferred for the applications which don’t require too high compressive strength and their specific energy absorption values were notably capable to compete with fully solid pipe structures. In particular, rib shape lattice structure had the highest elongation while the fully solid one possessed worst ductility. Lastly, it is pointed out that 3D printing method provides a great opportunity to have a foresight about production of uncommon parts by prototyping.
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EIFF, OLIVIER S., and JAMES F. KEFFER. "On the structures in the near-wake region of an elevated turbulent jet in a crossflow." Journal of Fluid Mechanics 333 (February 25, 1997): 161–95. http://dx.doi.org/10.1017/s0022112096004314.

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A pattern-recognition technique, applied to multi-point simultaneous velocity measurements obtained with 45° X-wire anemometer probes, is used to extract and characterize the underlying organized motions, i.e. coherent structures, within the near-wake region of a turbulent round jet discharged perpendicularly from a pipe into a crossflow. This flow has been found to be quite complex owing to its three-dimensional nature and the interactions between several flow regions. Analyses of the underlying coherent structures, which play an important role in the physics of the flow, are still rare and are mostly based on flow-visualization techniques. Using a pattern-recognition technique in conjunction with hot-wire measurements, we recently examined the wake regions of the pipe and jet at levels near the tip of the pipe, and found that Kármán-like vortex structures in the wake of the pipe are locked to similar structures in the jet-wake. In this paper we expand upon our previous work and characterize these structures throughout the wake of the jet up into the region of the bent-over jet – a region where they have not been identified previously. The complex geometry of these structures in the wake of the jet as well as their interaction with the bent-over jet are discussed. The results show that these structures split before they link to similar structures on the opposite side of the symmetry plane in the jet region. The results further suggest that the vorticity due to the structures in the wake of the jet contributes to the motion of the well-known counter-rotating vortex pair.
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Danawe, Hrishikesh, Gorkem Okudan, Didem Ozevin, and Serife Tol. "Conformal gradient-index phononic crystal lens for ultrasonic wave focusing in pipe-like structures." Applied Physics Letters 117, no. 2 (July 13, 2020): 021906. http://dx.doi.org/10.1063/5.0012316.

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Lee, Hyung Yil, Jin Haeng Lee, and Tae Hyung Kim. "Failure Assessment Diagrams of Semi-Elliptical Surface Crack with Constraint Effect." Key Engineering Materials 353-358 (September 2007): 1952–55. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.1952.

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For accurate failure assessment, a second parameter like T-stress describing the constraint is needed in addition to the single parameter J-integral. In this work, selecting the structures of surface-cracked plate and pipe, we perform line-spring finite element modeling, and accompanying elastic-plastic finite element analyses. We then present a framework, which includes the constraint effects in the R6 FAD approach for failure assessment of cracked-structures.
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Lee, Hyung Yil, Jin Haeng Lee, and Tae Hyung Kim. "Failure Assessment Diagrams of Semi-Elliptical Surface Crack with Constraint Effect." Key Engineering Materials 353-358 (September 2007): 98–101. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.98.

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For accurate failure assessment, a second parameter like T-stress describing the constraint is needed in addition to the single parameter J-integral. In this work, selecting the structures of surface-cracked plate and pipe, we perform line-spring finite element modeling, and accompanying elastic-plastic finite element analyses. We then present a framework, which includes the constraint effects in the R6 FAD approach for failure assessment of cracked-structures.
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Book chapters on the topic "Pipe-like structures"

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Le, Ductho, Nguyen Van Hung, Haidang Phan, Yen Nguyen, Trinh Van Quyen, and Quang Hung Le. "Analysis of Longitudinal Guided Wave Modes in Pipe-Like Structures." In Computational Intelligence Methods for Green Technology and Sustainable Development, 647–55. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-19694-2_57.

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Okudan, Gorkem, Chenxi Xu, Hrishikesh Danawe, Serife Tol, and Didem Ozevin. "Improved Detection of Localized Damage in Pipe-Like Structures Using Gradient-Index Phononic Crystal Lens." In Lecture Notes in Civil Engineering, 292–99. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-07322-9_30.

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Woo, Jaejoon. "(Why) Is the Recent Recovery So Different from the Past?" In Confronting South Korea's Next Crisis, 25–62. Oxford University Press, 2022. http://dx.doi.org/10.1093/oso/9780198864424.003.0002.

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The prospect of the economy returning to high growth looks increasingly like a pipe dream for many Koreans. The unusually weak pace of the recent economic recovery amid continued decline in trend growth has become a major concern. Yet the unpleasant economic downtrend has been years in the making, as suggested by a wide range of economic indicators. This chapter explores the debate on the nature of the growth deceleration from a short-term business cycle perspective. A new event-study of recovery episodes shows that the most recent recovery was the weakest among eleven business cycles since 1970 and uncovers important (and some surprising) new features about the recent recovery episode, shedding some light on a likely future growth path. Against the backdrop of post-crisis sluggish global growth amid retreat from globalization, unusual weakness is a result of a series of adverse shocks (domestic, external) compounding the already slowing growth trend on structural problems. In particular, negative shocks amplified repercussions owing to Korea’s unique industrial structure, with heavy reliance on manufacturing exports, highly concentrated exports sensitive to certain types of shocks, and substantial linkage with China playing a significant role in dramatically weakening the strength of economic recovery.
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Conference papers on the topic "Pipe-like structures"

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Mampel, Jorg, Kurt Gerlach, Cornelius Schilling, and Hartmut Witte. "A modular robot climbing on pipe-like structures." In 2009 4th International Conference on Autonomous Robots and Agents. IEEE, 2009. http://dx.doi.org/10.1109/icara.2000.4803967.

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Shen, Jingjun, and Jung-Wuk Hong. "Numerical modeling of guided waves in pipe-like structures." In SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, edited by Masayoshi Tomizuka, Chung-Bang Yun, and Jerome P. Lynch. SPIE, 2012. http://dx.doi.org/10.1117/12.915416.

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Fjerdingen, Sigurd A., Pal Liljeback, and Aksel A. Transeth. "A snake-like robot for internal inspection of complex pipe structures (PIKo)." In 2009 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS 2009). IEEE, 2009. http://dx.doi.org/10.1109/iros.2009.5354751.

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Okudan, Gorkem, Hrishikesh Danawe, Serife Tol, and Didem Ozevin. "Manipulating the torsional mode in pipe-like structures with mechanical lens for extended propagation distance." In Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XV, edited by Tzu-Yang Yu and Andrew L. Gyekenyesi. SPIE, 2021. http://dx.doi.org/10.1117/12.2583303.

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Tol, Serife, Gorkem Okudan, and Didem Ozevin. "Wave focusing in pipe-like structures via gradient-index metamaterial lens toward damage detection and localization." In Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems, edited by Kon-Well Wang, Hoon Sohn, Haiying Huang, and Jerome P. Lynch. SPIE, 2019. http://dx.doi.org/10.1117/12.2513938.

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Danawe, Hrishikesh G., Didem Ozevin, and Serife Tol. "Numerical Investigation of Multi-Mode Guided Wave Focusing in Pipe–Like Structures Using Gradient Index Metamaterial Lens Design." In ASME 2020 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/detc2020-22522.

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Abstract This paper presents a numerical study on multi-mode focusing of guided elastic waves in pipe-like structures over a range of frequencies using a single metamaterial lens design. We explore focusing of the first two longitudinal (L(0,1) and L(0,2)) and the first torsional (T(0,1)) wave modes in steel pipe integrated with a metamaterial lens made of cylindrical steel stubs of varying heights attached to outer surface of the pipe. Proposed metamaterial lens design is based on gradient index (GRIN) theory with hyperbolic secant distribution of refractive index in circumferential direction. Amplification of multi-mode guided wave signals are achieved at focal points of the lens which is verified through numerical simulations. The focusing performance of proposed lens is studied at multiple frequencies for all the three modes and first two focal positions are verified with theoretical predictions of GRIN theory.
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Liu, Xiaoqing, Yong Tang, Minqiang Pan, and Lelun Jiang. "Manufacturing Heat Pipe by Combined Ploughing-Extrusion Process." In 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2007. http://dx.doi.org/10.1115/mnc2007-21374.

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Since the capillary structures in the internal wall of heat pipe dominate the heat transfer performance, the research of surface heat functional structure is being gradually extended to the fields of metastructure and microstructure. This paper proposes a combined ploughing-extrusion method with a multi-tooth tool to form the micro-groove structures in the internal surface of copper pipe. Experiments indicate that the combined ploughing-extrusion process can create rougher surface than the single ploughing-extrusion process, and some phoenix-feather-like structures appear. The capillary force comparative experiment indicates that the heat pipe manufactured by the combined method can absorb 0.2ml more liquid than the one made by single process, supposing there is 90ml liquid in the container. The heat transfer testing experiment also indicates this heat pipe can transfer more heat when the inclination angle is small, but with the increase of inclination angle, this superiority becomes not so evident due to the increased reflow resistance. The combined process that comprises more than two processes makes metal yield and generates cracks in the internal wall.
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Chattopadhyay, Som. "Fatigue Crack Growth in Plate-Like Structures Due to Thermal Striping." In ASME 2002 Pressure Vessels and Piping Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/pvp2002-1324.

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A method has been presented for fatigue crack growth in plate like structures exposed to harmonically varying fluid temperature distributions. In piping systems, where the cold and hot fluids mix in a whirl, the vibrating mixing boundary between hot and cold fluids causes a fluctuating temperature distribution on the inner surface of the pipe. This gives rise to alternating stress distribution resulting in crack initiation and growth. The fatigue crack arrest behavior has been analyzed based on the stress intensity factor due to thermal stress. The number of cycles required to extend a crack of a given depth to a certain amount has been calculated as a function of the temperature amplitude and frequency of the oscillating temperature distribution.
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Hamamoto, Yukari, and Makoto Toyoda. "Pipe Rupture Analysis Considering Fluid-Structure Interaction." In ASME 2011 Pressure Vessels and Piping Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/pvp2011-57534.

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Global warming is caused by the emission of greenhouse gases, like CO2. Nuclear energy is one of the main sources of low-carbon energy. In the events of serious accidents, a nuclear power plant may emit radioactivity that is harmful to human health. Nuclear power should be used after enough evidence of its safety is provided. Measures for safety of nuclear power plants, such as autogenous control and LBB, have been developed. Moreover, there is requirement with respect to the design, safety, equipments components and systems of nuclear plant. For example, it is necessary to place components that restrain pipe whip behavior, and to design peripheral equipments that may be affected by high-pressured fluid in pipe rupture accidents [1], [2]. In the case of pipe rupture that occurs to structures such as nuclear plants and steam generators, a pipe deforms releasing its inner high-pressured fluid. In previous studies, the pipe whip behavior analyses have been performed by using blowdown thrust force that is estimated by fluid analysis. In this study, we simulate pipe whip behavior and reduction of blowdown thrust force by releasing inner fluid to the atmosphere. The analysis model is an elbow pipe and high-pressure fluid running inside. We considered fluid-structure interaction effect in the analysis because ovalization of the cross-section of the elbow part as well as a change of the elbow torus radius affects fluid flow blowing out from the ruptured part of the pipe.
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Moody, F. J. "Vessel Steam Pipe Rupture Force on Internals." In ASME 2008 Pressure Vessels and Piping Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/pvp2008-61010.

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A postulated steam pipe rupture in a water-moderated nuclear power plant would cause a sonic discharge from the rupture and the formation of a large-amplitude step decompression, which would travel through the pipe to the reactor vessel. When the decompression arrived at the reactor, it would propagate into the vessel where it would exert decompression forces on the internal steam dryer and other surfaces. The magnitude of the decompression can be 40 bars or more when first beginning in the steam line. If the initial magnitude entered the vessel as a step, even though attenuated by expanding, damage could occur to the dryer components. However, solution of the propagation equations show that a step decompression in a compressible fluid spread as it travels so that its arrival at the vessel is a ramp disturbance in time rather than a step. This feature causes a decompression force of smaller impulse to be exerted on vessel internal structures. This study presents an analytical model for quickly estimating conservative decompression forces on a flat wall structure (like a dryer surface) inside a reactor caused by a steam line rupture. It is shown that longer steam line lengths and greater distances between the vessel wall and the dryer surface result in smaller transient load magnitudes. Also, smaller dryer surface dimensions cause the dryer force duration to be decreased.
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