This paper presents a computational study on the aerodynamic effectiveness of vane-type fan-flow deflectors used for reducing jet noise from a supersonic turbofan exhaust with bypass ratio of 2.7. The numerical code solved the three-dimensional Reynolds-averaged Navier–Stokes equations. A series of nozzle configurations using deflector vanes of variable number, airfoil section, azimuthal mounti...

In this paper, we propose a solution to the motion control problem of a 2-link revolute manipulator arm. We require the end-effector of the arm to move safely to its designated target in a priori known workspace cluttered with fixed circular obstacles of arbitrary position and sizes. Firstly a unique velocity algorithm is used to move the end-effector to its target. Secondly, for obstacle avoid...

Density or gravity currents have been always one of the main causes for sedimentation along many of the dam reservoirs. So controlling this phenomenon is very important for increasing useful life of such reservoirs. In this research study the effect of a combination of rough bed and obstacle on the control of sedimentary density current has been investigated. Experiments were conducted in a til...

In this paper, we propose and validate a framework for visual navigation with collision avoidance for a wheeled mobile robot. Visual navigation consists of following a path, represented as an ordered set of key images, which have been acquired by an on-board camera in a teaching phase. While following such path, the robot is able to avoid obstacles which were not present during teaching, and wh...

A practical real-time system for passive obstacle detection and avoidance is presented. Range information is obtained from stereo images by rst computing a disparity picture from the image pair and extracting points above the ground plane. Then these points are projected onto the ground plane and an Instantaneous Obstacle Map (IOM) is obtained. The IOM is transformed into a one dimensional stee...

Investigation of the JJPW-G100 air-assisted spraying dust suppression device was performed to obtain reasonable installation angle nozzle in device. First, an equal-scale physical model established, and then effect on atomizing performance investigated in-depth via numerical simulation. Results showed that imposed no significant range device, while initial falling spray field increased with inc...

Cylindrical thin-walled tubes due to construction and easy installation, high energy absorption capacity are used in the automotive industry as an impact energy absorber. However, the main weakness of cylindrical tubes is in the high initial peak load. Therefore, in this paper, to overcome this weakness, a buckling initiator is used at the top of the tube. This buckling initiator is a steel rod...

SUMMARY The Report discusses briefly the philosophy of parametric methods of load measurement in which load is not measured directly, but is deduced from a statistical correlation with an appropriate combination of aircraft motion variables and control surface angles. It describes a full-scale flight experiment on a Lightning Mk T5 aimed at developing a parametric method for the measurement of ...

Abstract The installation error of an acoustic transceiver array is one the important sources in ultra-short baseline (USBL) system. In a USBL system with positioning accuracy 0.5%, angle 1° will lead to 1.7% times slant distance. this paper, dual transponder-based calibration method for proposed. First, errors induced by various angles are deduced and analysed using linear measurement seafloor...