The Royal Aeronautical Society, also known as the RAeS, is a British multi-disciplinary professional institution dedicated to the global aerospace community. Founded in 1866, it is the oldest aeronautical society in the world. Members, Fellows, and Companions of the society can use the post-nominal letters MRAeS, FRAeS, or CRAeS, respectively.
Swarm intelligence algorithms have been in recent years one of the most used tools for planning the trajectory of a mobile robot. Researchers are applying those algorithms to find the optimal path, which reduces the time required to perform a task by the mobile robot. In this paper, we propose a new method based on the grey wolf optimizer algorithm (GWO) and the improved elephant herding optimization algorithm (IEHO) for planning the optimal trajectory of a mobile robot. The proposed solution consists of developing an IEHO algorithm by improving the basic EHO algorithm and then hybridizing it with the GWO algorithm to take advantage of the exploration and exploitation capabilities of both algorithms. The comparison of the IEHO-GWO hybrid proposed in this work with the GWO, EHO, and cuckoo-search (CS) algorithms via simulation shows its effectiveness in finding an optimal trajectory by avoiding obstacles around the mobile robot.
Computational Fracture Mechanics (CFM) is key to several branches in science and engineering, such as Solid and Structural Mechanics, Geomechanics, Aerospace Engineering, Structural Health Monitoring and Damage Tolerant Design. Among the different numerical techniques that are being employed and developed in the framework of Computational Fracture Mechanics, the extended Finite Element Method (X-FEM) is one of the most powerful and versatile. By introducing enrichment functions along with standard Finite Element shape functions, the X-FEM enables very accurate simulation of fields with discontinuities and fields that feature singularities such as crack opening displacements and stresses at the vicinity of a crack tip respectively. This chapter aims to highlight the effectiveness of the X-FEM method for fracture simulation and structural integrity assessment through two state of the art applications namely; (1) Hydraulic Fracture Propagation in Naturally Fractured Porous Media, and (2) Coupling X-FEM with Peridynamics (PD) for dynamic fracture propagation in brittle materials. A brief introduction to Computational Fracture Mechanics with emphasis on the X-FEM method history, development and relevant literature is included.
This report describes the project to develop a powerplant simulator for models of commercial aircraft tested in wind tunnels, using an electric motor to drive the fan. It will describe the history, procurement, design, manufacture, test and results, and serve as an introduction to the supporting presentations given by the associated partners of the project.
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The main objective of an aircraft aerodynamics is to improve the aerodynamic characteristics and maneuverability of the aircraft. The reduction in drag and stall phenomena will automatically enhance the aerodynamic characteristics. This project is an effort to enhance the aerodynamic characteristics of airfoil by introducing some surface modifications in the form of dimples. The shape of the dimples we selected is circular shaped dimple. We placed 12 numbers of dimples in both the surfaces with 12 in the upper surface and 12 in lower surface. The dimples were located in an appropriate place so that it could delay the boundary layer formation. The dimple generally creates turbulence by creating vortices which in turn delays the boundary layer formation. With the effects of dimple pressure drag gets reduced and also the acoustic effects get reduced. This project includes the computational analysis of dimple effect on aircraft wing using NACA 0018 airfoil with uniform cross section throughout the length of airfoil. Subsonic flows are considered for this analysis. The analyses were done under the inlet velocity of 30 m/s and 60m/s at different angle of attack such as 0, 5, 10, and 15 degrees. The models were designed using CATIA V5 and simulated using ANSYS CFX software package.
