in this paper a new strategy is proposed to design a fixed-structure robust controller for a flexible beam.  robust controller designed by the conventional  loop­ shaping method is not appropriate for a beam because of its high order and complicated form. fixed-structure  loop shaping control in conjunction with particle swarm optimization (pso)algorithm  is used to overcome this drawback. the ...

The bifurcations of a class of mappings including the beam–beam map are examined. These maps are asymptotically linear at infinity where they exhibit invariant curves and elliptic periodic points. The dynamical behaviour is radically different with respect to the Hénon-like polynomial maps whose stability boundary (dynamic aperture) is at a finite distance. Rather than the period-doubling bifur...

The main purpose of this paper is to introduce several concepts of the metric-like spaces. For instance, we define concepts such as equal-like points, cluster points and completely separate points. Furthermore, this paper is an attempt to present compatibility definitions for the distance between a point and a subset of a metric-like space and also for the distance between two subsets of a metr...

Damage detection has been focused by researchers because of its importance in engineering practices. Therefore, different approaches have been presented to detect damage location in structures. However, the higher the accuracy of methods is required the more complex deliberations. Based on the conventional studies, it was observed that the damage locations and its size are associated with dynam...

In Einstein’s theory of general relativity with a negative cosmological constant Λ, a vacuum spacetime is a solution to the equation Rab = Λgab and the lowest-energy solution is the anti-de Sitter spacetime. Moreover it was proved by Bocher-GibbonsHorowitz [BGH84] in 3+1 dimensions that the anti-de Sitter spacetime is the unique static, asymptotically anti-de Sitter vacuum. To give the precise ...

Much of our knowledge about QCD and the structure of hadrons (mainly nucleons) has been gained from Deep Inelastic Scattering (DIS) experiments such as eN → eX or νN → μX . The (inclusive) cross sections are determined by structure functions F1 and F2 when summing over beam and target polarisations (and an additional F3 when using neutrino beams), and g1, g2 when both the beam and target are su...

in this paper, the capabilities of displacement curvature derived from static response data for finding the location and severity of damage in euler-bernoulli beams are assessed. static response of a beam is obtained using the finite element modeling. in order to reduce the number of measured nodal displacements, the beam deflection is fitted through a polynomial function using a limited number...

in this paper, the nonlinear conjugate map based on the conjugate hasofer-lind and rackwitz- fiessler (chl-rf) method is applied to evaluate the reliability index using first order reliability method of the embedded noanocompsite beam, which is made from polymer reinforced with carbon nanotubs (cnts). the structure is simulated with timoshenko beam model. the mori-tanaka model is applied for ca...