Topic
Bending moment
About: Bending moment is a research topic. Over the lifetime, 14577 publications have been published within this topic receiving 158834 citations. The topic is also known as: bending moment.
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TL;DR: In this article, the authors assess the contribution of the second bending mode to the dynamic behavior of simply supported railway bridges and decide whether the second mode should be taken into account for the determination of the maximum displacement and acceleration in high-speed bridges.
Abstract: This paper deals with the assessment of the contribution of the second bending mode to the dynamic behavior of simply supported railway bridges. Traditionally the contributions of modes higher than the fundamental have been considered of little importance for the computation of the magnitudes of interest to structural engineers (vertical deflections, bending moments, etc.). Starting from the dimensionless equations of motion of a simply supported beam subjected to moving loads, the key parameters governing the dynamic behavior are identified. Then, a parametric study over realistic ranges of values of those parameters is conducted, and the influence of the second mode examined in detail. The main purpose is to decide whether the second mode should be taken into account for the determination of the maximum displacement and acceleration in high-speed bridges. In addition, the reasons that cause the contribution of the second bending mode to be relevant in some situations are highlighted, particularly with regard to the computation of the maximum acceleration.
72 citations
07 Sep 1994
TL;DR: Active flexible wing (AFW) technology is discussed in this paper, where two design procedures for the design and optimization of an AFW wing are described in detail, one for an existing wing and the other for a new wing using AFW technology.
Abstract: This paper discusses Active Flexible Wing (AFW) technology and describes how it differs from conventional wing design. The benefits of AFW are briefly described. Two design procedures which aid in the design and optimization of an AFW wing are described in detail. The first procedure is for the design of an AFW control system on an existing wing. This procedure optimizes control surface positions to maximize air vehicle maneuverability, without exceeding structural limits. The second procedure is for the design of a new wing using AFW technology. This procedure simultaneously couples aerodynamic, structural, and external load designs. The process optimizes a wing structure and control surface positions for minimum weight and drag, while satisfying structural constraints. = buckling constraints = bending moment = drag of case i = hinge moment = roll moment of load case i = lift of load case i = pitching moment of load case i = roll rate = torsion moment = twist and camber variables (e.g., wing jig shape design) = structural design variables = flutter constraints = structural weight = control surface positions and air vehicle flight angle design variables = roll axis inertia = roll acceleration = stress constraints of load case i {a} = vector of rigid aerodynamic panel deflections {!} = lift vector on aerodynamic panels * Project Engineer, Advanced Aircraft Member AIAA [ A ] = aerodynamic panel lift due to alpha influence coefficient matrix [ B ] = aerodynamic to structural transformation matrix [ K ] = global stiffness matrix [ d ~ / dtk] = derivative of the global structural stiffness matrix with respect to structural design variables [ S I ] =structural flexibility matrix (in units of deflection per force) on aerodynamic model [ S A ] = structural flexibility matrix (in units of rotation per force) on aerodynamic model
72 citations
TL;DR: In this paper, the effects of bow flare on deck wetness and the asymmetry of the vertical wave bending moment were investigated in both regular and irregular waves for models with two kinds of bow flares.
Abstract: Model tests were conducted in both regular and irregular waves for models with two kinds of bow flare form. The purpose of the tests was to obtain information on the effects of bow flare on deck wetness and the asymmetry of the vertical wave bending moment. The model was made of synthetic resins so as to simulate the bending rigidity of a full scale ship. The measured results are analysed as to the intensity of impact pressure in the bow, the frequency of the deck wetness, and the asymmetry of the bending moment.
72 citations
TL;DR: In this paper, a series of 33 femoral bones have been subjected to a four point bending test at high strain rates and two different failure modes were recognized: a Y-shaped fracture at the middle region induced by a pure bending moment yielded a zone of non-linearity at the load vs deformation curve and a higher bending force, more deformation of the structure and higher strain energy to fracture compared with the less frequently occurring oblique fracture, resulting in a failure without a 'plastic' portion at the deformation boundary.
72 citations
Patent•
04 Nov 1985
TL;DR: In this article, a system for reducing wing root bending moment load during aircraft maneuvers was proposed, which operates to reduce the lift on the outboard section of the wing by moving an outboard flap upward in response to commands calculated from aircraft parameters.
Abstract: A system for reducing wing root bending moment load during aircraft maneuvers. The system operates to reduce the lift on the outboard section of the wing by moving an outboard flap upward in response to commands calculated from aircraft parameters and a predetermined wing root bending moment load limit.
72 citations