Journal ArticleDOI
Flutter Instability of Cracked Rotating Non-Uniform Beams Subjected to Distributed Follower Force
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In this article, the effect of an open edge crack on the instability of rotating non-uniform beams subjected to uniform distributed tangential compressive load is studied using the finite element method.Abstract:
In this paper, the effect of an open edge crack on the instability of rotating non-uniform beams subjected to uniform distributed tangential compressive load is studied. The local stiffness due to the presence of crack is considered in the global stiffness matrix of the structure using the finite element method. The cracked beam element is modeled as two equal sub-beam elements connected by a massless rotational spring. Based on the fracture mechanics, the strain energy release rate and the stress intensity factors are employed to investigate the stiffness of the rotational spring. Then, the modified shape functions are developed to reflect the crack stiffness in the finite element analysis. To validate the accuracy of the finite element model and results obtained, comparisons have been made between the results obtained and those available in the literature. The effects of several parameters, including the linear and nonlinear thickness variations, angular velocity, crack location and size, on the instability of cracked rotating non-uniform cantilevers are also examined. The results show that the location of crack significantly influences the critical magnitude of the follower force that destabilizes the cantilevers. In addition, geometric non-uniformity reduces the stability of the cracked cantilevers. For the same amount of cantilever mass, different patterns of mass distribution result in different stability diagrams.read more
Citations
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Nonlinear Dynamic Response of FG Graphene Platelets Reinforced Composite Beam with Edge Cracks in Thermal Environment
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Dynamic analysis of cracked rotating blade using cracked beam element
TL;DR: In this paper, a dynamic model of a pre-twisted cracked rotating blade is established using self-programed beam element (CBE) and its nonlinear characteristics are analyzed.
Journal ArticleDOI
Multi-Frequency Weak Signal Detection Based on Wavelet Transform and Parameter Selection of Bistable Stochastic Resonance Model
TL;DR: In this paper, a novel method based on wavelet transform and bistable stochastic resonance (SR) with optimized parameters is proposed for weak signal detection, where the original signal is preprocessed using wavelet decomposition and reconstruction through the bandwidth of the measured signal.
Journal ArticleDOI
Analytical and Experimental Flutter Analysis of a Typical Wing Section Carrying a Flexibly Mounted Unbalanced Engine
TL;DR: In this article, both experimental and analytical flutter analyses are conducted for a typical 5-degree of freedon (5DOF) wing section carrying a flexibly mounted unbalanced engine.
Journal ArticleDOI
Non-conservative stability of spinning pretwisted cantilever beams
TL;DR: In this article, the stability of a pretwisted cantilever beam spinning about its longitudinal axis and subjected to non-conservative force is investigated, and the effect of several design parameters including the pretwist angle, the cross section ratio, the viscoelastic parameters and load span length on the stability and critical load and spinning speed of the spinning cantilevers are identified.
References
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Book
The stress analysis of cracks handbook
TL;DR: The Stress Analysis of Cracks Handbook as mentioned in this paper provides a comprehensive, easy-to-access collection of elastic stress solutions for crack configurations, along with other relevant information, such as displacements, crack opening areas, basic stress functions source references, accuracy of solutions, and more.
Book
Fluid-Structure Interactions: Slender Structures and Axial Flow
TL;DR: In this article, the first volume of the Fluid-Structure Interaction (FSI) series, Volume 1 covers the fundamentals and mechanisms giving rise to flow-induced vibration, with a particular focus on the challenges associated with pipes conveying fluid.
Book
Energy principles and variational methods in applied mechanics
TL;DR: In this paper, the authors present a review of the work, energy, and variational calculus of solid mechanics and their application in the analysis of plate models. But their focus is on the theory and analysis of plates.
Nonlinear equations of motion for the elastic bending and torsion of twisted nonuniform rotor blades
Dewey H. Hodges,Earl H. Dowell +1 more
TL;DR: In this article, the Hamilton's principle and the Newtonian method are used to derive the equations of motion for long, straight, slender, homogeneous, isotropic beams undergoing moderate displacements.
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