Topic
Deflection (engineering)
About: Deflection (engineering) is a research topic. Over the lifetime, 30862 publications have been published within this topic receiving 298849 citations.
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TL;DR: In this paper, a new approach for investigating the vibration behaviors of axially functionally graded Timoshenko beams with non-uniform cross-section is presented. And the derived characteristic equation is a polynomial equation, where the lower and higher-order natural frequencies can be determined simultaneously from the multi-root.
Abstract: This paper presents a new approach for investigating the vibration behaviors of axially functionally graded Timoshenko beams with non-uniform cross-section. By introducing an auxiliary function, we can change the coupled governing equations with variable coefficients for the deflection and rotation to a single governing equation. Moreover, all physical quantities can be expressed in terms of the solution of the resulting equation. Making use of power series for unknown function, we can transform the single equation to a system of linear algebraic equations and will get a characteristic equation in natural frequencies for different boundary conditions. An advantage of the suggested approach is that the derived characteristic equation is a polynomial equation, where the lower and higher-order natural frequencies can be determined simultaneously from the multi-roots. Several examples of estimating natural frequencies for axially grade beams and non-uniform beams are presented, which show that our method has fast convergence and obtained numerical results have high accuracy.
160 citations
TL;DR: In the present investigation, the fingertips of three adult humans and four monkeys were indented in vivo using a line load delivered by a sharp wedge, and the resulting skin surface deflection profile was photographed to infer the mechanical nature of the materials that make up the fingertip.
160 citations
TL;DR: In this paper, the authors investigated passive vehicle suspensions with inerters by considering multiple performance requirements including ride comfort, suspension deflection and tyre grip, where suspensions deflection performance is novelly considered which is formulated as a part of objective functions and a constraint separately.
160 citations
13 Sep 2016
TL;DR: In this article, the authors analyzed the uncertainty of the estimation of the wake deflection downstream of yawed wind turbines in different ambient wind conditions and found that the wake shapes and the magnitude of deflection differ in the three evaluated atmospheric boundary layers of neutral, stable and unstable thermal stability.
Abstract: . An intentional yaw misalignment of wind turbines is currently discussed as one possibility to increase the overall energy yield of wind farms. The idea behind this control is to decrease wake losses of downstream turbines by altering the wake trajectory of the controlled upwind turbines. For an application of such an operational control, precise knowledge about the inflow wind conditions, the magnitude of wake deflection by a yawed turbine and the propagation of the wake is crucial. The dependency of the wake deflection on the ambient wind conditions as well as the uncertainty of its trajectory are not sufficiently covered in current wind farm control models. In this study we analyze multiple sources that contribute to the uncertainty of the estimation of the wake deflection downstream of yawed wind turbines in different ambient wind conditions. We find that the wake shapes and the magnitude of deflection differ in the three evaluated atmospheric boundary layers of neutral, stable and unstable thermal stability. Uncertainty in the wake deflection estimation increases for smaller temporal averaging intervals. We also consider the choice of the method to define the wake center as a source of uncertainty as it modifies the result. The variance of the wake deflection estimation increases with decreasing atmospheric stability. Control of the wake position in a highly convective environment is therefore not recommended.
160 citations
TL;DR: In this paper, a modified energy-balance model coupled with the law of conservation of momentum is proposed to extend the validity of elastic impact models beyond the elastic regime, and three parameters were derived from the static load-deformation response: the elastic stiffness, the critical load at the onset of damage, and the damaged stiffness.
159 citations