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 article, an innovative variable stiffness spar (VSS) approach is studied for improving aircraft roll performance, where some of the existing wing spars are replaced by the adaptive-structure VSS to control the stiffness as a function of Mach number and altitude.
Abstract: An innovative variable stiffness spar (VSS) approach is studied for improving aircraft roll performance. In this concept some of the existing wing spars are replaced by the adaptive-structure VSS to control the stiffness as a function of Mach number and altitude. The VSS stiffness scheduling is designed to maximize the roll rate while satisfying flutter, control surface hinge moment, and maximum deflection constraints. The VSS mechanism consists of segmented spar having articulated joints at the connections with wing ribs and an electrical actuator capable of rotating the spar. The wing stiffness provided by the spar varies sinusoidally as a function of the rotation angle. The objective of the present study is to explore when and how to best apply this concept and assess its payoffs in terms of performance gains. The F/A-18 pre-roll-modification aircraft was selected as the baseline aircraft for its low torsional wing stiffness and available flight data. The multidisciplinary design optimization software ASTROS * was used tier performing the analyses in the Mach number range of M = 0.8-1.2 at altitudes up to 35,000 ft (40,668 m). Results show that VSS can amplify the aeroelastic forces and significantly enhance roll performance of aireraft.
63 citations
TL;DR: In this article, a comparative analysis of experimental and theoretical deflections of simply supported beams reinforced with BFRP rebar (Basalt Fiber Reinforced Polymers) is presented, where the results clearly show that basalt rebar having full resistance against corrosion may be good alternative for the reinforcement of concrete structures, like RC bridge girders subjected to environmental attack.
63 citations
TL;DR: In this article, the free vibration of plates with internal discontinuities due to central cut-outs is analyzed using a numerical formulation for a basic L-shaped element which is divided into appropriate sub-domains that are dependent upon the location of the cut-out.
63 citations
TL;DR: In this paper, the effects of wing morphing on unsteady aerodynamics, deformable flapping plates are numerically studied in a low-Reynolds-number flow using an in-house immersed-boundary-method-based direct numerical simulation (DNS) solver.
63 citations
TL;DR: In this article, the authors exploit self-excited oscillations of a fluttering composite beam to harvest energy using piezoelectric transduction, and the effects of preset angle of attack, wind speed, and load resistance on the levels of harvested power are determined.
Abstract: Previous attempts to harvest energy from aeroelastic vibrations have been based on attaching a beam to a moving wing or structure. Here, we exploit self-excited oscillations of a fluttering composite beam to harvest energy using piezoelectric transduction. Details of the beam properties and experimental setup are presented. The effects of preset angle of attack, wind speed, and load resistance on the levels of harvested power are determined. The results point to a complex relation between the aerodynamic loading and its impact on the static deflection and amplitudes of the limit cycle oscillations on one hand and the load resistance and level of power harvested on the other hand.
63 citations