This paper presents the design, analysis and experimental testing of a variablepitch quadrotor. A custom in-lab built quadrotor with on-board attitude stabilization is developed and tested. An analysis of the dynamic differences in thrust output between a fixed-pitch and variable-pitch propeller is given and validated with simulation and experimental results. It is shown that variable-pitch act...

This article describes a solution to create a hardwarein-the-loop (HIL) simulation system of civil aircraft thrust reverser with Modelica-based simulation platform -MWorks in Windows system. The HIL system uses simulation platform “MWorks” to model and simulate the thrust reverser hydraulic system, and takes hardware -PLC’s output signals as the inputs of the simulation. Modeling module, commun...

The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. This paper presents the design, analysis and experimental testing of a variable-pitch quadrotor. A custom in-lab built quadrotor with on-board attitude stabilization is developed and tested. An analysis of the dynamic differences in thrust output between a fixed-pitch and varia...

This paper describes an investigation into the effects of coding and modulating GPRS data, on the output RF measurement. The thrust of the work has been to look at the effect on the RF output when different types of pseudo random sequences with different lengths and different phases are fed at the input. The paper also provides an overview of the GPRS system in terms of it’s system architecture...

We attempted investigate a boat model, based on the conversion of energy of surface wave into a sequence of unidirectional pulses of jet spurts, in other words model of the boat, which is thrusting by the waves field on water surface. These pulses are forming some average reactive stream from the output nozzle on the stern of boat. The suggested model provides the conversion of its oscillatory ...

The paper proposes a new formulation of the output feedback pole assignment problem. In this formulation, a unified approach is presented for solving the pole assignment problem with various additional objectives. These objectives include optimizing a variety of performance indices, and imposing constraints on the output feedback matrix structure, e.g. decentralized structure. Conditions for th...

Arising as a new class of energetic material, nanoporous energetic silicon holds great potential for applications such as fuzing and thrust generation, which require large power output. In this paper we address fabrication and material characterization as well as monolithic integration of a hotwire initiator and packaging; the first steps toward a fully integrated MEMS/IC/energetic material sys...

In this paper, a new design of permanent magnet linear synchronous motor (PMLSM) for electromagnetic launcher system (EMLs) has been investigated in terms of the requisite amount of average launching thrust force and thrust force ripple minimization through finite element method. EMLs are a kind of technology used to develop thrust force and launch heavy loads with different applications includ...

This thesis presents an approach for the optimization of the propulsion system of an unmanned lightweight quadrotor by introducing rotor aerodynamics and identifying methods to improve the electrical propulsion system (EPS), hence improving its performance and efficiency. Since the rotor is the main component to generate thrust, a numerical model based on the combined momentum and blade element...