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Significance of Multi-level Fusion in Multi-component Fault Diagnosis under Speed Varying Condition in Rotational Machinery
Get PDFMost well-known challenging effects of identifying multiple defects in a rotational machine when speed is varied, are illustriously inspected by many researchers. However, different fusion logics are evolved in the series of research attempt, but not paid much attention in interrogating it for unsteady speed signals.Addressing this literature void, this paper focusses on multi-level fusion strategy with the help of sensor-centric feature integration and Dempster Shafer’s (D-S) theory of evidence for uncovering multi-faults in bearings, shafts and gears of rotational machines under speed variational condition. Primarily, instantaneous frequency and envelope from the acquired vibration and sound signals of complex system parts are evaluated and fed to Machine learning (ML) such as Support vector machine (SVM) and K-nearest neighbors (KNN) which verifies the classification performance. The propriety of D-S combination rule is credited by comparing it with the results of other renowned decision-based fusion such as Structural causal model (SCM) and weighted voting method (WVM). This enlightens the effect of imposing DS theory for combining the ML results of integrated vibration and sound signals which is symbolized as multi-level aggregation with 85.76 % accuracy. To illuminate more of this proposed method, a profound investigation over misclassified shaft classes for vibration signals using SVM-RBF are discovered and verified for single-level and multilevel fusion. This yields promising results for multistage fusion approach in rotational machinery fault diagnosis at varying speed rate
Deaf History Month
Get PDFCollection of posters created for National Deaf History Month. Poster topics include: General Books, Streaming Films, and Curated Open Access Research Resources created by UTRGV faculty and graduate students. Book and video covers are hyperlinked.https://scholarworks.utrgv.edu/librarydisplayposters/1084/thumbnail.jp
To Compare Is Human: A Review of Social Comparison Theory in Organizational Settings
Get PDFSocial comparisons are one of the most ubiquitous behaviors that individuals, groups, and firms undertake. In particular, social comparison theory is based upon the premise that actors are motivated to engage in comparisons and that decisions throughout this process impact employees’ core self-evaluations, team relations, executives’ behaviors, firm prestige, and more. However, despite the prevalence of the phenomenon—and thereby the frequent application of the theory in organizational studies—a synopsis of the theory’s underpinnings and extant findings remains absent. Here, we present a state-of-the-art review that summarizes the theory’s history and mechanics and critically examines how social comparison theory has been applied in organizational studies across multiple levels of analysis. In particular, we identify several problems within the literature, including patterns of theoretical imprecision when applying the theory, lopsided attention paid to the micro-level of analysis, and an underappreciation of subjective comparisons. In addition to discussing the extant literature and common methodological approaches, we present a simplified model of social comparisons. Based on this new theory-building, we discuss ways the field can move forward to reconcile some of the identified problems
Semilinear Klein-Gordon equation in space-time of black hole which is gaining mass in the universe with accelerating expansion
No full textIn this paper, we consider the propagation of waves in the space-time of a single black hole with a static Schwarzschild radius in the expanding universe, namely, the solutions of the linear and semilinear Klein-Gordon equations
[Weslaco] Photograph of Leoline Horton
No full textPortrait of Leoline Horton, teacher at Weslaco ISD.https://scholarworks.utrgv.edu/hidalgohist_aa/1522/thumbnail.jp
[Weslaco] Photograph of William Jenkines
No full textPortrait of Attorney William Jenkines.https://scholarworks.utrgv.edu/hidalgohist_aa/1583/thumbnail.jp
[McAllen] Photograph of Railroad Crossing
No full textRailroad crossing at Corner Main at Highway 83 in McAllen, Texas.https://scholarworks.utrgv.edu/hidalgohist_aa/1556/thumbnail.jp
[McAllen] Photograph of Municipal Hospital
No full textMunicipal Hospital in McAllen, Texas located on Main and Houston St.https://scholarworks.utrgv.edu/hidalgohist_aa/1705/thumbnail.jp
[Brownsville] Photograph of International Bridge
No full textInternational Bridge in Brownsville, Texas looking towards Mexico.https://scholarworks.utrgv.edu/hidalgohist_aa/1700/thumbnail.jp
[McAllen] Photograph of Easter Seals Society on Stage
No full textMembers of the Easter Seals Society on stage.https://scholarworks.utrgv.edu/hidalgohist_aa/1555/thumbnail.jp