The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents the control during take-off, transition and straight and level flight of a convertible aircraft based on Gain-Scheduling technique. The vehicle motion equations are deduced using Newton-Euler formulation. The lift, drag and pitch moment coefficients are modeled for angle of attack variations between one hundred eighty degrees and minus one hundred eighty degrees based on preliminary...
This paper is about a control design for the lateral-directional dynamics of a fixed wing aircraft. The objective is to command the lateral-directional dynamics to the equilibrium point that corresponds to a coordinated turn. The proposed control is inspired by the total energy control system technique; with the objective of mixing the ailerons and the rudder inputs. The control law is developed directly...
A conceptual third party risk (TPR) model is developed, implemented, and tested to demonstrate the capability of determining the risk to the population in a metropolitan city exposed to personal aerial vehicles (PAVs) and unmanned aerial vehicles (UAVs) traffic operations. The conceptual model that is primarily based on the methodology and experience of risk modelling for conventional aircraft is...
Fixed wing Unmanned Aerial Vehicles (UAVs) are an increasingly common sensing platform, owing to their key advantages: speed, endurance and ability to explore remote areas. While these platforms are highly efficient, they cannot easily be equipped with air data sensors commonly found on their larger scale manned counterparts. Indeed, such sensors are bulky, expensive and severely reduce the payload...
This work studies a longitudinal high incidence flight envelope dynamic model for use in a convertible tilt-body vehicle designed for indoor/outdoor environments. The model assumptions are chosen so that a singularity-free nonlinear differential equation system is obtained. The model is complex enough to predict wind tunnel experiments yet simple enough to be described by analytical expressions (instead...
This paper presents the key design features, the numerical simulations and the experimental ground/flight test activities performed to verify the functionalities of an obstacle detection and avoidance system suitable for various classes of manned and unmanned aircraft. The Laser Obstacle Avoidance and Monitoring (LOAM) system is proposed as one of the key non-cooperative sensors adopted for avoiding...
This paper proposes a control strategy for the quadrotor helicopter based on the Total Energy Control System (TECS) approach. Assuming that the rotational dynamics control loop is faster than the translational dynamics control loop, a TECS based control strategy is designed for the translational dynamics. The performance of the proposed control strategy is verified experimentally.
This paper investigates the ability of a quadrotor to maneuver in a wind field. A dynamic model of a quadrotor is presented to model its motion. The quadrotor model includes a wind effect model to quantify the effect of wind on the dynamics of a quadrotor. A proportional-integral-derivative (PID) controller is shown as a baseline controller typically used on quadrotors. A LQR controller is then shown...
This paper is about solar irradiation estimation on a solar powered UAV over its mission course [1]. Solar irradiation estimation and maximizing the solar energy collection are critical for solar powered UAVs and their performance. In this paper main focus is on solar irradiation calculations and comparison of two possible flight paths for solar energy collection during a transport or inspection mission.
This work proposes the representation of the high level dynamicmodel of a quadrotor UAVwith a suspended load, through Euler-Lagrange equations. The rotorcraft movement is restricted to the XZ plane of the Cartesian space, so that it performs like a PVTOL machine. A nonlinear controller is proposed to stabilize the quadrotor and the load, during positioning and trajectory tracking tasks. Finally, simulated...
This paper presents the algorithms enabling real-time 4-Dimensional Flight Trajectory (4DT) functionalities in Next Generation Mission Management Systems (NG-MMS), which are the core element of future Remotely Piloted Aircraft Systems (RPAS) avionics. In particular, the algorithms are employed for multi-objective optimisation of 4DT intents in various operational scenarios spanning from online strategic...
In this article, the dynamic model for an Unmanned Aircraft System (UAS) enhanced with morphing capabilities is presented. The developed model describes three different modes of operation, which are: horizontal body flight configuration, vertical body flight configuration, and morphing stage. The proposed dynamic model considers a multi-rotorcraft which makes use of eight rotors for flying in the...
This paper describes the theory and implementation of a trajectory optimization layer operating within an energy-aware, airborne, dynamic data-driven application system (EA-DDDAS). The work addresses wind field data estimation, trajectory optimization, and implementation of communication protocols to increase sUAS endurance in persistent sensing missions. The trajectory optimization layer acts as...
This paper outlines development process of Y6-Rotor Micro UAV, which consists of concept of motion, modeling of the vehicle dynamics, rapid prototyping of the mechanics and finally practical realization of the VTOL. This paper presents a micro air vehicle designed to participate in the 2014 International Micro Air Vehicle Conference and Flight Competition (IMAV). Designed mechanical structure may...
This paper describes a navigation algorithm for small fixed-wing airplanes so as to perform path following. The wind gusts need to be taken into account as they play a key role in small prototypes, being the main disturbance when flights are performed. To solve this issue, we use an algorithm known in the literature as carrot-chasing, which includes wind estimates. A Lyapunov stability based control...
In this paper, fuzzy logic control method is used to control the formation flight of fixed wing aircraft in leader-follower form. A two loop control structure is used. In the inner loop, aircraft flight is controlled using the State Dependent Riccati Equation (SDRE) method. In the outer loop, fuzzy logic control approach is used to control the formation guidance. The success of the approach is demonstrated...
Increasing research into aerial manipulation technology has widened the scope of possible applications for unmanned aircraft. One such application that is introduced in this paper is above-canopy sampling in forests. A preliminary study has investigated the problem experimentally as a means of determining a representative scenario whilst identifying key issues. These issues include relative position...
A Six DOF nonlinear model of a large unmanned aerial system is developed using two competing approaches in modeling aircraft with V-tail configuration. In one approach the V-tail is projected into horizontal and vertical planes and the aircraft airflow angles, angle of attack and sideslip angle, are used for analysis. This approach has been successfully used to model aircraft with low horizontal tail...
This paper presents implementation of a novel guidance logic for multi-agent fixed-wing unmanned aerial systems using a moving mesh method. The moving mesh method is originally designed for use in the adaptive numerical solution of partial differential equations where a high proportion of mesh points are placed in the regions of large solution variation and few points in the rest of the domain. In...
This article presents a review on the platform design, dynamic modeling and control of hybrid Unmanned Aerial Vehicles (UAVs). For now, miniature UAVs which have experienced a tremendous development are dominated by two main types, i.e., fixed-wing UAV and Vertical Take-Off and Landing (VTOL) UAV, each of which, however, has its own inherent limitations on such as flexibility, payload, axnd endurance...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.