Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 150
Book Description
Redundant Actuator Development Study
Author: Investigation and Development of Redundancy Techniques to Achieve Dual Fault Corrective Capability in Flight Control Actuators
Author: J. E. RindePublisher:
ISBN:
Category :
Languages : en
Pages : 188
Book Description
The objective of this study and investigation was to develop dual fault corrective capability for increased reliability by applying redundancy at the element level in flight control actuation components. Studies were performed to determine the functional and operational requirements for a flight control actuator capable of operating after two failures. A survey of presently used actuator mechanizations and failure correction techniques was made to categorize them along functional lines and to establish six possible dual fault correcting actuator (DFCA) configurations. An operational and failure analysis of the six DFCA configurations was made to determine their fault corrective capability relative size, cost and potential reliability. From this analysis, the Triplex Actuator with Electronic Model and Logic and the Quadruplex Actuator with Hydraulic Logic were selected for detail design development. These designs have one active actuator which controls the output and two operating standby actuators that can be locked-in to drive the output, with undegraded performance, when a failure occurs. Detail mechanical, hydraulic and electrical design was performed to obtain the two tentative actuator designs. A detail analysis and computer simulation of the system equations was performed to determine transients due to failures. An overall relative comparison of a single system, single fault and the two DFCA designs, indicates that the Triplex Actuator achieves dual fault corrective capability with a minimum increase in weight, size, power and complexity.
Scientific and Technical Aerospace Reports
Author: Research and Development of Aircraft Control Actuation Systems. The Development of a Direct Drive Fly-By-Wire Flight Control System and Evaluation of a Force Sharing Fly-By-Wire Actuator
Author: Gavin D. JenneyPublisher:
ISBN:
Category :
Languages : en
Pages : 216
Book Description
This report describes the design and test evaluation of a direct drive fly-by-wire redundant control system. Also included in the report is the evaluation testing of a fly-by-wire tandem actuator mechanization developed by Parker-Hannifin Aerospace Hydraulics Division, Irvine California. The direct drive system is based on using moving coil force motors to position a hydraulic control valve without hydraulic amplification. The system is designed as a single fail operate system which will accept one input or component failure and continue to operate with acceptable performance. The test results verified that the failure modes and performance met the design goals. The system incorporates component dispersion techniques to allow single hit survivability. The direct drive mechanization offers adequate performance with minimum complexity as a fly-by-wire control system. The Parker-Hannifin actuator mechanization is a two fail operate configuration using an integrated secondary actuator with both force and position summing. The test results document the operational characteristics of the design. (Author).
Electro-Mechanical Actuators for the More Electric Aircraft
Author: Mirko MazzoleniPublisher: Springer Nature
ISBN: 3030617998
Category : Technology & Engineering
Languages : en
Pages : 256
Book Description
This book presents recent results on fault diagnosis and condition monitoring of airborne electromechanical actuators, illustrating both algorithmic and hardware design solutions to enhance the reliability of onboard more electric aircraft. The book begins with an introduction to the current trends in the development of electrically powered actuation systems for aerospace applications. Practical examples are proposed to help present approaches to reliability, availability, maintainability and safety analysis of airborne equipment. The terminology and main strategies for fault diagnosis and condition monitoring are then reviewed. The core of the book focuses on the presentation of relevant case studies of fault diagnosis and monitoring design for airborne electromechanical actuators, using different techniques. The last part of the book is devoted to a summary of lessons learned and practical suggestions for the design of fault diagnosis solutions of complex airborne systems. The book is written with the idea of providing practical guidelines on the development of fault diagnosis and monitoring algorithms for airborne electromechanical actuators. It will be of interest to practitioners in aerospace, mechanical, electronic, reliability and systems engineering, as well as researchers and postgraduates interested in dynamical systems, automatic control and safety-critical systems. Advances in Industrial Control reports and encourages the transfer of technology in control engineering. The rapid development of control technology has an impact on all areas of the control discipline. The series offers an opportunity for researchers to present an extended exposition of new work in all aspects of industrial control.
Flight Control Actuator System Development
Author: Dale G. BazillPublisher:
ISBN:
Category :
Languages : en
Pages : 226
Book Description
This report describes the following research tasks: The test and evaluation of a quadruplex redundant Pitch Axis Test Rig (PATR) to fully describe the hydraulic, mechanical and electronic technology contained therein; and the design of a Roll Axis Test Rig (RATR) to permit hardware simulation of quad redundant, force sharing, active standby, median select and split surface flight control system mechanizations that have high dynamic response.
Technical Information Indexes
Author: United States. Naval Air Systems CommandPublisher:
ISBN:
Category : Aeronautics, Military
Languages : en
Pages : 276
Book Description
NASA Technical Memorandum
Author: Modelling, Control and Monitoring of High Redundancy Actuation
Author: Jessica DaviesPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The High Redundancy Actuator (HRA) project investigates a novel approach to fault tolerant actuation, which uses a high number of small actuation elements, assembled in series and parallel in order to form a single intrinsically fault tolerant actuator. Element faults affect the maximum capability of the overall actuator, but through control techniques, the required performance can be maintained. This allows higher levels of reliability to be attained in exchange for less over-dimensioning in comparison to conventional redundancy techniques. In addition, the combination of both serial and parallel elements provides intrinsic accommodation of both lock-up and loose faults. Research to date has concentrated on HRAs based on electromechanical technology, of relatively low order, controlled through passive Fault Tolerant Control (FTC) methods. The objective of this thesis is to expand upon this work. HRA configurations of higher order, formed from electromagnetic actuators are considered. An element model for a moving coil actuator is derived from first principles and verified experimentally. This element model is then used to form high-order, non-linear HRA models for simulation, and reduced-order representations for control design. A simple, passive FTC law is designed for the HRA configurations, the results of which are compared to a decentralised, active FTC approach applied through a framework based upon multi-agent concepts. The results indicate that limited fault tolerance can be achieved through simple passive control, however, performance degradation occurs, and requirements are not met under theoretically tolerable fault levels. Active FTC offers substantial performance improvements, meeting the requirements of the system under the vast majority of theoretically tolerable fault scenarios. However, these improvements are made at the cost of increased system complexity and a reliance on fault detection. Fault Detection (FD) and health monitoring of the HRA is explored. A simple rule-based FD method, for use within the active FTC, is described and simulated. An interacting multiple model FD method is also examined, which is more suitable for health monitoring in a centralised control scheme. Both of these methods provide the required level of fault information for their respective purposes. However, they achieve this through the introduction of complexity. The rule-based method increases system complexity, requiring high levels of instrumentation, and conversely the interacting multiple model approach involves complexity of design and computation. Finally, the development of a software demonstrator is described. Experimental rigs at the current project phase are restricted to relatively low numbers of elements for practical reasons such as cost, space and technological limitations. Hence, a software demonstrator has been developed in Matlab/Simulink which provides a visual representation of HRAs with larger numbers of elements, and varied configuration for further demonstration of this concept.
Government Reports Annual Index
Author: Publisher:
ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 882
Book Description