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Design And Simulation Of A Control System For Helicopter Slung Loads
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Book Synopsis Design and Simulation of a Control System for Helicopter Slung Loads by : Jayanth Krishnamurthi
Download or read book Design and Simulation of a Control System for Helicopter Slung Loads written by Jayanth Krishnamurthi and published by LAP Lambert Academic Publishing. This book was released on 2013 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: A control design method to address low-speed stability and handling qualities issues of helicopter slung load operations is presented. A simple model was developed using first principle physics with application of basic control techniques to understand the couple dynamics. Subsequently, a non-linear slung load model was developed and integrated with the GenHel-PSU simulation of the UH-60A. Linear model frequency responses were verified against AFDD OVERCAST models and flight data. A control architecture based on dynamic inversion was developed, combining fuselage and load state feedback. Slung load states were incorporated in feedback linearization and lagged cable angle feedback was introduced. A controller that uses only lagged cable angle feedback (and no load states in feedback linearization) was also investigated. Sensitivity to load parameter variations and optimization methodologies were considered in aiding the design process. The controller and its variations demonstrated key trade-offs between load swing damping and piloted response. The controller was robust and maintained closed-loop stability for a wide range of load mass and cable length values.
Book Synopsis Design and Simulation of a Lagged Cable Angle Feedback Control System for Helicopter Slung Loads by : Jayanth Krishnamurthi
Download or read book Design and Simulation of a Lagged Cable Angle Feedback Control System for Helicopter Slung Loads written by Jayanth Krishnamurthi and published by . This book was released on 2013 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design and Analysis of an Active Jet Control System for Helicopter Sling Loads by : Mark D. Pardue
Download or read book Design and Analysis of an Active Jet Control System for Helicopter Sling Loads written by Mark D. Pardue and published by . This book was released on 1979 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design and Analysis of an Active Jet Control System for Helicopter Sling Loads by : Mark D. Pardue
Download or read book Design and Analysis of an Active Jet Control System for Helicopter Sling Loads written by Mark D. Pardue and published by . This book was released on 1979 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design and Simulation of a Model Helicopter Control System by : Scott Almburg
Download or read book Design and Simulation of a Model Helicopter Control System written by Scott Almburg and published by . This book was released on 2008 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design and Flight Test of a Cable Angle Feedback Control System for Improving Helicopter Slung Load Operations at Low Speed by : Christina Michael Ivler
Download or read book Design and Flight Test of a Cable Angle Feedback Control System for Improving Helicopter Slung Load Operations at Low Speed written by Christina Michael Ivler and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The ability of a helicopter to carry externally slung loads makes it very versatile for many civil and military operations. However, the piloted handling qualities of the helicopter are degraded by the presence of the slung load. This dissertation investigates the dynamics, handling qualities requirements, and control aspects of the helicopter/slung load system that contribute to the performance of piloted slung load operations. A control system is developed that integrates measurements of both slung load motions and conventional fuselage feedback to improve the handling qualities for hover/low speed operations. Despite the fact that this technology was developed 40 years ago, it has not been tested in a manned helicopter since the 1970s, due to problems with handling qualities and pilot perception. This dissertation leverages advances in fly-by-wire, complex control design procedures (direct multi-objective optimization), and recently developed work that relates handling qualities to dynamic response (specifications) to successfully flight test cable angle feedback technology in a manned helicopter. The key contributions of this work are developing an understanding of the handling qualities trade-offs for cable angle/rate control system design, implementing an approach to solve the problem with a novel task-tailored control system, and performing extensive piloted flight tests of the control system on a fly-by-wire Black Hawk. The flight tests demonstrated that average precision load set-down time was reduced by 50% for a light load, 30% for a heavy load, and the average handling qualities rating for the external load placement task was improved from Level 2 to Level 1 on the Cooper-Harper rating scale, a significant improvement.
Book Synopsis Modeling, Control and Coordination of Helicopter Systems by : Beibei Ren
Download or read book Modeling, Control and Coordination of Helicopter Systems written by Beibei Ren and published by Springer Science & Business Media. This book was released on 2012-02-02 with total page 243 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modeling, Control and Coordination of Helicopter Systems provides a comprehensive treatment of helicopter systems, ranging from related nonlinear flight dynamic modeling and stability analysis to advanced control design for single helicopter systems, and also covers issues related to the coordination and formation control of multiple helicopter systems to achieve high performance tasks. Ensuring stability in helicopter flight is a challenging problem for nonlinear control design and development. This book is a valuable reference on modeling, control and coordination of helicopter systems,providing readers with practical solutions for the problems that still plague helicopter system design and implementation. Readers will gain a complete picture of helicopters at the systems level, as well as a better understanding of the technical intricacies involved.
Book Synopsis Equations of Motion of Slung-load Systems, Including Multilift Systems by : Luigi S. Cicolani
Download or read book Equations of Motion of Slung-load Systems, Including Multilift Systems written by Luigi S. Cicolani and published by . This book was released on 1992 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development and Validation of a Piloted Simulation of a Helicopter and External Sling Load by : John Damian Shaughnessy
Download or read book Development and Validation of a Piloted Simulation of a Helicopter and External Sling Load written by John Damian Shaughnessy and published by . This book was released on 1979 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flight Test Identification and Simulation of a UH-60A Helicopter and Slung Load by :
Download or read book Flight Test Identification and Simulation of a UH-60A Helicopter and Slung Load written by and published by . This book was released on 2001 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: Helicopter slung-load operations are common in both military and civil contexts. Helicopters and loads are often qualified for these operations by means of flight tests, which can be expensive and time consuming. There is significant potential to reduce such costs both through revisions in flight-test methods and by using validated simulation models. To these ends, flight tests were conducted at Moffett Field to demonstrate the identification of key dynamic parameters during flight tests (aircraft stability margins and handling-qualities parameters, and load pendulum stability), and to accumulate a data base for simulation development and validation. The test aircraft was a UH-60A Black Hawk, and the primary test load was an instrumented 8- by 6- by 6-ft cargo container. Tests were focused on the lateral and longitudinal axes, which are the axes most affected by the load pendulum modes in the frequency range of interest for handling qualities; tests were conducted at airspeeds from hover to 80 knots. Using telemetered data, the dynamic parameters were evaluated in near real time after each test airspeed and before clearing the aircraft to the next test point. These computations were completed in under 1 min. A simulation model was implemented by integrating an advanced model of the UH-60A aerodynamics, dynamic equations for the two-body slung-load system, and load static aerodynamics obtained from wind-tunnel measurements. Comparisons with flight data for the helicopter alone and with a slung load showed good overall agreement for all parameters and test points; however, unmodeled secondary dynamic losses around 2 Hz were found in the helicopter model and they resulted in conservative stability margin estimates.
Author :U.S. Army Air Mobility Research and Development Laboratory. Eustis Directorate Publisher : ISBN 13 : Total Pages : pages Book Rating :4.:/5 (172 download)
Book Synopsis Flight Simulation of the Model 347 Advanced Tandem-rotor Helicopter by : U.S. Army Air Mobility Research and Development Laboratory. Eustis Directorate
Download or read book Flight Simulation of the Model 347 Advanced Tandem-rotor Helicopter written by U.S. Army Air Mobility Research and Development Laboratory. Eustis Directorate and published by . This book was released on 1974 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Automatic Flight Control Systems by : Thomas Lombaerts
Download or read book Automatic Flight Control Systems written by Thomas Lombaerts and published by BoD – Books on Demand. This book was released on 2012-01-18 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: The history of flight control is inseparably linked to the history of aviation itself. Since the early days, the concept of automatic flight control systems has evolved from mechanical control systems to highly advanced automatic fly-by-wire flight control systems which can be found nowadays in military jets and civil airliners. Even today, many research efforts are made for the further development of these flight control systems in various aspects. Recent new developments in this field focus on a wealth of different aspects. This book focuses on a selection of key research areas, such as inertial navigation, control of unmanned aircraft and helicopters, trajectory control of an unmanned space re-entry vehicle, aeroservoelastic control, adaptive flight control, and fault tolerant flight control. This book consists of two major sections. The first section focuses on a literature review and some recent theoretical developments in flight control systems. The second section discusses some concepts of adaptive and fault-tolerant flight control systems. Each technique discussed in this book is illustrated by a relevant example.
Book Synopsis Advances in Automation, Mechanical and Design Engineering by : Giuseppe Carbone
Download or read book Advances in Automation, Mechanical and Design Engineering written by Giuseppe Carbone and published by Springer Nature. This book was released on with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flight Dynamics and Control of Two Autonomous Helicopters Carrying an External Slung Load by : Marcos G. Berrios
Download or read book Flight Dynamics and Control of Two Autonomous Helicopters Carrying an External Slung Load written by Marcos G. Berrios and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Cargo missions of the near future will require transportation of increasingly heavy loads to remote locations that are at distances farther, and at altitudes higher, than what can be accomplished by current helicopters. Using two helicopters to carry a single load, termed dual lift, provides heavy lift on demand and avoids the very costly design and development of a special purpose heavy lift helicopter. The dual lift benefits of increased lifting capability, increased range, and flight at higher density altitudes, are contingent on equal load distribution between the helicopters. In other words, each helicopter must lift an equal portion of the external payload. Furthermore, to maximize these benefits, the helicopters must operate close to their maximum power available, leaving little room for unequal load distribution. This research focuses on gaining a fundamental understanding of the dynamic behavior of a dual lift system and the associated flight control challenges. A detailed stability and control analysis of the dual lift system has been conducted and the unique multi-body modes and their effects on the development of an attitude control system has been quantified. With the identified control challenges as a foundation, a multi-objective parametric optimization approach has been used to design an attitude control system that meets a comprehensive set of stability and performance specifications. In addition, a guidance and control strategy that ensures equal load distribution between the helicopters has been developed. The guidance strategy computes an optimal trajectory for the system to fly using nonlinear programming and incorporates a feedback controller that commands an additive height change for the trail helicopter to account for un- modeled dynamics and disturbances. The developed concepts, models, and guidance strategies have been validated and assessed via flight test experiments on two medium-sized, autonomous RMAX helicopters (10 ft rotor diameter). This was the first time that two autonomous helicopters have been flown in the pendant configuration and with a control system that equalized the two helicopter loads.
Book Synopsis Active Stabilization of Slung Loads in High Speed Flight Using Cable Angle Feedback by : Mariano Scaramal
Download or read book Active Stabilization of Slung Loads in High Speed Flight Using Cable Angle Feedback written by Mariano Scaramal and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Helicopters performing external load missions are subject to instabilities that arise in high speed flight that limit their operational flight envelope. This thesis addresses the problem of active stabilization of slung loads in high speed flight. To demonstrate the method, simulations of a utility helicopter with a dynamic inversion controller (as its automatic flight control system) and a CONEX cargo container were used. An airspeed scheduled controller utilizing cable angle feedback to the primary dynamic inversion controller was designed for the nonlinear coupled system by the classic root locus technique. Nonlinear simulations of straight and level flight at different airspeeds were used to validate the controller performance in stabilizing the load pendulum motions. Controller performance was also evaluated in a complex maneuver and in more demanding scenarios by adding different levels of atmospheric turbulence to the previous cases. The results show that the use of cable angle feedback provides or improves system stability when turbulence is not included in the simulation. When light/moderate turbulence is present sustained limit cycle oscillations are avoided by the use of the controller. For severe turbulence levels, the controller did not provide any significant improvement.
Book Synopsis Mathematical Modelling of Helicopter Slung-Load Systems by :
Download or read book Mathematical Modelling of Helicopter Slung-Load Systems written by and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary goal of this work is to use mathematical modelling to assist in defining the operational limits of the Australian Army CH-47D Chinook when carrying mixed density slung loads. This report presents the first phase in the program: the development of a simple helicopter slung-load model for simulation and analysis of the system dynamics. General system equations of motion are obtained from the Newton-Euler equations in terms of generalized coordinates and velocities. The system is partitioned into coordinates such that the motion due to cable stretching is separated from that due to rigid-body, coupled dynamics. In the formulation used, the constraint forces appear explicitly and a solution to the resultant generalized accelerations can be determined by modelling the cable as a simple spring. An inelastic solution is also possible by nulling the stretching coordinates to obtain a relation for the suspension forces. The system equations are also extended for the multiple load case. The model is verified by imposing certain constraints in order to approximate a simple pendulum system and then comparing its behaviour with analytical results. Various configurations of the complete helicopter slung-load system, based on the CH-47B Chinook carrying standard military containers, are then examined in an investigation of the open-loop characteristics. In the investigation, several parameters such as the helicopter-load mass ratio, suspension configuration, and number of loads are varied and the resulting system modes examined. A number of simulations are also presented which demonstrate the characteristic behaviour of such systems.
Book Synopsis Mathematical Modelling of Helicopter Slung-Load Systems by : Roger Alexander Stuckey
Download or read book Mathematical Modelling of Helicopter Slung-Load Systems written by Roger Alexander Stuckey and published by . This book was released on 2001 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary goal of this work is to use mathematical modelling to assist in defining the operational limits of the Australian Army CH-47D Chinook when carrying mixed density slung loads. This report presents the first phase in the program: the development of a simple helicopter slung-load model for simulation and analysis of the system dynamics. General system equations of motion are obtained from the Newton-Euler equations in terms of generalized coordinates and velocities. The system is partitioned into coordinates such that the motion due to cable stretching is separated from that due to rigid-body, coupled dynamics. In the formulation used, the constraint forces appear explicitly and a solution to the resultant generalized accelerations can be determined by modelling the cable as a simple spring. An inelastic solution is also possible by nulling the stretching coordinates to obtain a relation for the suspension forces. The system equations are also extended for the multiple load case. The model is verified by imposing certain constraints in order to approximate a simple pendulum system and then comparing its behaviour with analytical results. Various configurations of the complete helicopter slung-load system, based on the CH-47B Chinook carrying standard military containers, are then examined in an investigation of the open-loop characteristics. In the investigation, several parameters such as the helicopter-load mass ratio, suspension configuration, and number of loads are varied and the resulting system modes examined. A number of simulations are also presented which demonstrate the characteristic behaviour of such systems.
