An experimental program supported by the Italian Space Agency was started at Politecnico di Torin... more An experimental program supported by the Italian Space Agency was started at Politecnico di Torino. Static and oscillatory data were collected for a reference model of the Apollo Command Module configuration. The experimental results are presented here and the stability of the equivalent real capsule is also discussed.
ABSTRACT The paper deals with the measurement of the dynamic stability derivatives of a generic c... more ABSTRACT The paper deals with the measurement of the dynamic stability derivatives of a generic combat aircraft model undergoing forced oscillation motion in roll. The experiments are performed in the 8’ x 10’ low-speed, closed circuit Ankara Wind Tunnel (AWT). The model used for measurements is the so called “Standard Dynamic Model”, which is used for wind-tunnel tests in various NATO countries. The model was designed and manufactured within the scope of a NATOAGARD Working Group (WG16) project. The aerodynamic loads acting on the model are measured by means of a five-component internal strain gauge balance. The elaboration of the signal output of the balance is analyzed, according to the small-amplitude direct forced oscillation technique. This technique is a reliable method used to obtain basic dynamic stability derivatives without solving the equations of motion. The paper presents the test rig used to perform the oscillatory tests in the roll plane, the motion control and the data acquisition units that are interfaced to the test rig to measure the aerodynamic loads. A brief review of the forced oscillation technique is also given and the results of the measurements are briefly discussed.
2013 International Conference on Unmanned Aircraft Systems (ICUAS), 2013
ABSTRACT In this paper a systematic mixed deterministic-randomized approach for adaptive filter d... more ABSTRACT In this paper a systematic mixed deterministic-randomized approach for adaptive filter design is presented. This method has two advantages: (i) it is a computational efficient algorithm for the deterministic parameters and (ii) we can design fixed order controllers because we follow a randomization approach. Different filter forms are selected to prove the effectiveness of this algorithm and the obtained results are applied to a multi rotor UAV. Both linear and experimental models are analyzed. With this filter the designed controller permits to minimize the noise due to the coupling between the control axes. This design is useful to reduce the set up time of the filter when the platform to be controlled is changed.
Backstepping represents a promising control law for fixed-wing Unmanned Aerial Vehicles (UAVs). I... more Backstepping represents a promising control law for fixed-wing Unmanned Aerial Vehicles (UAVs). Its non-linearity and its adaptation capabilities guarantee adequate control performance over the whole flight envelope, even when the aircraft model is affected by parametric uncertainties. In the literature, several works apply backstepping controllers to various aspects of fixed-wing UAV flight. Unfortunately, many of them have not been implemented in a real-time controller, and only few attempt simultaneous longitudinal and lateral–directional aircraft control. In this paper, an existing backstepping approach able to control longitudinal and lateral–directional motions is adapted for the definition of a control strategy suitable for small UAV autopilots. Rapidly changing inner-loop variables are controlled with non-adaptive backstepping, while slower outer loop navigation variables are Proportional–Integral–Derivative (PID) controlled. The controller is evaluated through numerical simulations for two very diverse fixed-wing aircraft performing complex manoeuvres. The controller behaviour with model parametric uncertainties or in presence of noise is also tested. The performance results of a real-time implementation on a microcontroller are evaluated through hardware-in-the-loop simulation.
Several different flow visualization techniques are used to observe, both in air and in water, th... more Several different flow visualization techniques are used to observe, both in air and in water, the features of well ordered streamwise vortices downstream of a slender axisymmetric cylinder with a slanted base. The visualization techniques used include surface skin friction visualization, helium bubble technique, and total pressure field representation (in air) and a tracer technique (in water). Results of the flow visualization of the body wake are presented along with examples of balance measurements and pressure measurements on the base.
Several different flow visualization techniques are used to observe, both in air and in water, th... more Several different flow visualization techniques are used to observe, both in air and in water, the features of well ordered streamwise vortices downstream of a slender axisymmetric cylinder with a slanted base. The visualization techniques used include surface skin friction visualization, helium bubble technique, and total pressure field representation (in air) and a tracer technique (in water). Results of the flow visualization of the body wake are presented along with examples of balance measurements and pressure measurements on the base.
Abstract—This paper describes the project: “Study and development of a real-time land control and... more Abstract—This paper describes the project: “Study and development of a real-time land control and monitoring system for fire prevention” co-funded ,by the ,Italian Ministry for Instruction, University, and Research (MIUR) within the framework of the PRIN 2004. This project has been devoted to study and develop a system for the territory control in order to prevent and mange natural disasters. The system can be thought as composed by two components: a mobile platform able to take on board a payload and a remote control station. The mobile platform is an Uninhabited Air Vehicle – UAV, while sensors, autopilot, and cameras are the payload. The paper presents the contributions of all research units that have designed and implemented both the platform and all the control systems used to allow autonomous,and,remote piloting of the UAV. I.,I NTRODUCTION UAVs (Uninhabited Aerial Vehicles) play ,an extremely important role as mobile platforms that can be employed,for environmental,monitoring...
An experimental program supported by the Italian Space Agency was started at Politecnico di Torin... more An experimental program supported by the Italian Space Agency was started at Politecnico di Torino. Static and oscillatory data were collected for a reference model of the Apollo Command Module configuration. The experimental results are presented here and the stability of the equivalent real capsule is also discussed.
ABSTRACT The paper deals with the measurement of the dynamic stability derivatives of a generic c... more ABSTRACT The paper deals with the measurement of the dynamic stability derivatives of a generic combat aircraft model undergoing forced oscillation motion in roll. The experiments are performed in the 8’ x 10’ low-speed, closed circuit Ankara Wind Tunnel (AWT). The model used for measurements is the so called “Standard Dynamic Model”, which is used for wind-tunnel tests in various NATO countries. The model was designed and manufactured within the scope of a NATOAGARD Working Group (WG16) project. The aerodynamic loads acting on the model are measured by means of a five-component internal strain gauge balance. The elaboration of the signal output of the balance is analyzed, according to the small-amplitude direct forced oscillation technique. This technique is a reliable method used to obtain basic dynamic stability derivatives without solving the equations of motion. The paper presents the test rig used to perform the oscillatory tests in the roll plane, the motion control and the data acquisition units that are interfaced to the test rig to measure the aerodynamic loads. A brief review of the forced oscillation technique is also given and the results of the measurements are briefly discussed.
2013 International Conference on Unmanned Aircraft Systems (ICUAS), 2013
ABSTRACT In this paper a systematic mixed deterministic-randomized approach for adaptive filter d... more ABSTRACT In this paper a systematic mixed deterministic-randomized approach for adaptive filter design is presented. This method has two advantages: (i) it is a computational efficient algorithm for the deterministic parameters and (ii) we can design fixed order controllers because we follow a randomization approach. Different filter forms are selected to prove the effectiveness of this algorithm and the obtained results are applied to a multi rotor UAV. Both linear and experimental models are analyzed. With this filter the designed controller permits to minimize the noise due to the coupling between the control axes. This design is useful to reduce the set up time of the filter when the platform to be controlled is changed.
Backstepping represents a promising control law for fixed-wing Unmanned Aerial Vehicles (UAVs). I... more Backstepping represents a promising control law for fixed-wing Unmanned Aerial Vehicles (UAVs). Its non-linearity and its adaptation capabilities guarantee adequate control performance over the whole flight envelope, even when the aircraft model is affected by parametric uncertainties. In the literature, several works apply backstepping controllers to various aspects of fixed-wing UAV flight. Unfortunately, many of them have not been implemented in a real-time controller, and only few attempt simultaneous longitudinal and lateral–directional aircraft control. In this paper, an existing backstepping approach able to control longitudinal and lateral–directional motions is adapted for the definition of a control strategy suitable for small UAV autopilots. Rapidly changing inner-loop variables are controlled with non-adaptive backstepping, while slower outer loop navigation variables are Proportional–Integral–Derivative (PID) controlled. The controller is evaluated through numerical simulations for two very diverse fixed-wing aircraft performing complex manoeuvres. The controller behaviour with model parametric uncertainties or in presence of noise is also tested. The performance results of a real-time implementation on a microcontroller are evaluated through hardware-in-the-loop simulation.
Several different flow visualization techniques are used to observe, both in air and in water, th... more Several different flow visualization techniques are used to observe, both in air and in water, the features of well ordered streamwise vortices downstream of a slender axisymmetric cylinder with a slanted base. The visualization techniques used include surface skin friction visualization, helium bubble technique, and total pressure field representation (in air) and a tracer technique (in water). Results of the flow visualization of the body wake are presented along with examples of balance measurements and pressure measurements on the base.
Several different flow visualization techniques are used to observe, both in air and in water, th... more Several different flow visualization techniques are used to observe, both in air and in water, the features of well ordered streamwise vortices downstream of a slender axisymmetric cylinder with a slanted base. The visualization techniques used include surface skin friction visualization, helium bubble technique, and total pressure field representation (in air) and a tracer technique (in water). Results of the flow visualization of the body wake are presented along with examples of balance measurements and pressure measurements on the base.
Abstract—This paper describes the project: “Study and development of a real-time land control and... more Abstract—This paper describes the project: “Study and development of a real-time land control and monitoring system for fire prevention” co-funded ,by the ,Italian Ministry for Instruction, University, and Research (MIUR) within the framework of the PRIN 2004. This project has been devoted to study and develop a system for the territory control in order to prevent and mange natural disasters. The system can be thought as composed by two components: a mobile platform able to take on board a payload and a remote control station. The mobile platform is an Uninhabited Air Vehicle – UAV, while sensors, autopilot, and cameras are the payload. The paper presents the contributions of all research units that have designed and implemented both the platform and all the control systems used to allow autonomous,and,remote piloting of the UAV. I.,I NTRODUCTION UAVs (Uninhabited Aerial Vehicles) play ,an extremely important role as mobile platforms that can be employed,for environmental,monitoring...
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Papers by F. Quagliotti