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Forced and Natural Vibrations of an Orthotropic Pre-Stressed Rectangular Plate with Neighboring Two Cylindrical Cavities

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Computers, Materials & Continua 2017年第1期53卷 1-22页

作者： u.babuscu yesil Department of Mathematical Engineering Faculty of Chemical and Metallurgical Eng.Yildiz Technical UniversityDavutpasa Campus34210EsenlerIstanbulTurkey.

Forced and natural vibrations of a rectangular pre-stressed orthotropic compositeplate containing two neighboring cylindrical cavities whose cross sections are rectangularwith rounded-off corners are investigated numerically. It is assumed that all the end surfacesof the rectangular pre-stressed composite plate are simply supported and subjected to auniformly distributed normal time-harmonic force on the upper face plane. The consideredproblem is formulated within the Three-Dimensional Linearized Theory of Elastic Waves inInitially Stressed Bodies (TDLTEWISB). The influence of mechanical and geometricalparameters as well as the initial stresses and the effect of cylindrical cavities on the dynamicalcharacteristics of the rectangular orthotropic composite plate are analyzed and discussed.

关键词： Initial stresses vibration cylindrical cavities 3D FEM orthotropic material.

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Scalogram-Based Instantaneous Features of Acoustic Emission in Grinding Burn Detection

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Journal of Dynamics, Monitoring and Diagnostics 2022年第1期1卷 19-28页

作者： Isa yesilyurt Abdullah Dalkiran Onder yesil Ozan Mustak Department of Mechanical Engineering Usak UniversityUsakTurkey Ortadoğu Rulman Sanayi(ORS) Polatli-AnkaraTurkey

Time-frequency methods are effective tools in identifying the frequency content of a signal and revealing its timevariant *** paper presents the use of instantaneous features(i.e.,instantaneous energy and signal phase)of acoustic emission(AE)in the detection of thermal damage to the workpiece in *** low-order frequency moments of a scalogram are used to obtain both the instantaneous energy and the mean frequency at which the signal phase is *** grinding process is monitored using AE for a variety of operating conditions,including regular grinding,grinding at higher cutting speed and larger feed,and small dressing depth of *** instantaneous features extracted by the scalogram are compared with the results obtained by the empirical mode *** has been found that both the instantaneous energy and phase deviation indicate the presence of burn damage and serve as robust and reliable indicators,providing a basis for detecting the grinding burn.

关键词： Acoustic emission grinding burn scalogram frequency moments phase deviation

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