Hover Flight Helicopter Modelling and Vibrations Analysis
نویسنده
چکیده
In this work, different modelling aspects of helicopter aerodynamics are discussed. The helicopter model is on Sikorsky configuration, main rotor in perpendicular combination with a tail rotor. The rotors are articulated and their blades are rigid. The main rotor implementation takes into account flap, lag and feather degrees of freedom for each of the equispaced blades as well as their dynamic couplings. The model was built by using VehicleSim, software specialized in modelling mechanical systems composed by rigid bodies. Appearing vibrations due to the rotating behaviour of the rotors are studied in here. This work presents an aerodynamic model that allows to simulate hover flight. The aerodynamic model has been built up using blade element theory. The aerodynamic load creates vibrations on the helicopter and these are analyzed on the fuselage by using short time Fourier transform processing to study the vibrations spectrum. The results of the simulations are presented and compared to existing mechanical vibrations generated by a dynamic model developed by the authors as well as existing theory in the specialist literature.
منابع مشابه
Helicopter Rotor Airloads Prediction Using CFD and Flight Test Measurement in Hover Flight
An implicit unsteady upwind solver including a mesh motion approach was applied to simulate a helicopter including body, main rotor and tail rotor in hover flight. The discretization was based on a second order finite volume approach with fluxes given by the Roeand#39;s scheme. Discretization of Geometric Conservation Laws (GCL) was devised in such a way that the three-dimensional flows on arbi...
متن کاملAutonomous Helicopter Flight via Reinforcement Learning
Autonomous helicopter flight represents a challenging control problem, with complex, noisy, dynamics. In this paper, we describe a successful application of reinforcement learning to autonomous helicopter flight. We first fit a stochastic, nonlinear model of the helicopter dynamics. We then use the model to learn to hover in place, and to fly a number of maneuvers taken from an RC helicopter co...
متن کاملTrajectory Generation for Aggressive Waypoint Transitions by an Autonomous Helicopter
This paper considers the problem of generating optimal guidance trajectories for high-speed waypoint transitions by an autonomous helicopter. Given a set of waypoints and a desired order for passing through them, an optimal control problem is solved using collocation for every pair of consecutive waypoints. The linear hover model of the Yamaha R-50 helicopter is employed in the optimal control ...
متن کاملAutonomous Helicopter Hover Using an Artificial Neural Network
This paper details the developments to date of an unmanned air vehicle (UAV) based on a standard size 60 model helicopter. The design goal is to have the helicopter achieve stable hover with the aid of an INS and stereo vision. The focus of this paper is on the development of an artificial neural network (ANN) that makes use of only the INS data to generate hover commands, which are used to dir...
متن کاملRobust nonlinear control of a 7 DOF model - scale helicopter under wind gusts using disturbance observers
Nowadays, high levels of agility, maneuverability and capability of operating in reduced visual environments and adverse weather conditions are the new trends of helicopter design. Helicopter flight control systems should make these performance requirements achievable by improving tracking performance and disturbance rejection capability. Robustness is one of the critical issues which must be c...
متن کامل