Download or read book Design of a High Speed Electromechanical Actuator for Control of a RTC Valve System written by Jonathan Marc Hollander and published by . This book was released on 1997 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design and Development of Multi Lane Smart Electromechanical Actuators written by Fawaz Yahya Annaz and published by IET. This book was released on 2014-03 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: The unavoidable element in the development of flight control systems (to date) has been in hydraulic actuators. This has been the case primarily because of their proven reliability and the lack of alternative technologies. However, the technology to build electromechanically actuated primary flight control systems is now available, which may mark the end of the hydraulic actuation systems - an important step for the development of the future 'all-electric' aircraft.

Download or read book An Electromechanical Valve Drive Incorporating a Nonlinear Mechanical Transformer written by Woo Sok Chang and published by . This book was released on 2003 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: In traditional internal combustion engines, a camshaft acts on the valve stems to open and close the valves. Valve timing is fixed relative to piston position. On the other hand, if a valve is flexibly controlled by a variable valve actuation (VVA) system, we can achieve significant improvements in fuel efficiency, engine performance, and emissions. One of the most advanced variable valve actuation systems is the VVA operated by an electromechanical actuator without a camshaft, the so-called bi-positional electromechanical valve drive (EMVD). Existing EMVDs characteristically use a spring to provide the required mechanical power for operating a valve. The use of a spring provides many benefits to the design of the system, but it also results in difficult design challenges. The large holding force against the spring at the ends of the stroke suggests the use of a normal-force electromagnetic actuator, which, from a servomechanical point of view, is considerably inferior to a shear-force actuator. Furthermore, the large holding force generates a large jerk at the beginning and the end of a stroke and makes it difficult to achieve soft valve landing. An innovative electromechanical valve drive (EMVD) design is proposed, which incorporates a nonlinear mechanical transformer and a shear-force actuator. This allows not only fast but also smooth valve motion, almost zero seating velocity, zero holding power, and improved control with acceptable electric power. This proposed concept is modeled, analyzed, simulated, designed, and implemented. Experimental results show the beneficial features of the promising proposed concept.

Download or read book Electro Mechanical Actuators for the More Electric Aircraft written by Mirko Mazzoleni and published by Springer Nature. This book was released on 2021-01-19 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Fundamentals of Engineering High Performance Actuator Systems written by Kenneth Hummel and published by SAE International. This book was released on 2016-12-01 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: Actuators are the key to allowing machines to become more sophisticated and perform complex tasks that were previously done by humans, providing motion in a safe, controlled manner. As defined in this book, actuator design is a subset of mechanical design. It involves engineering the mechanical components necessary to make a product move as desired. Fundamentals of Engineering High-Performance Actuator Systems, by Ken Hummel, was written as a text to supplement actuator design courses, and a reference to engineers involved in the design of high-performance actuator systems. It highlights the design approach and features what should be considered when moving a payload at precision levels and/or speeds that are not as important in low-performance applications. The main areas covered in this book are: Fundamentals of actuator design Actuator performance Loads that the actuator and its surrounding structure must accommodate Constraints which determine the type of load the actuator needs to accommodate The design margin applied to components of any given design Environment which must include the interactions between product and the conditions it will have to perform under Component strength to ensure safety from failure Component stiffness Maintainability Reliability Cost

Download or read book Electro Hydraulic Actuation Systems written by J. Jaidev Vyas and published by Springer. This book was released on 2018-09-01 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book serves as a unique integrated platform, which not only describes the design methodology of electro-hydraulic actuation systems but also provides insights into the design of the servo valve, which is the most important component in the system. It presents a step-by-step design process, comparative tables, illustrative figures, and detailed explanations. The book focuses on the design and testing of electro-hydraulic actuation systems, which are increasingly being used in motion control applications, particularly in those where precision actuation at high operational rates is of prime importance. It describes in detail the design philosophy of such high-performance systems, presenting a system used as a physical test setup together with experimental results to corroborate the calculations. Of particular interest are the electro-hydraulic servo valves that form the heart of these actuations. These valves are complex and not much data is available in open literature due to OEM propriety issues. In this context, the book discusses the elaborate mathematical models that have been derived and an approach to validate the mathematical models with test results. Presenting the complex methodology in simple language, it will prove to be a valuable resource for students, researchers, and professional engineers alike.

Download or read book The Design of a Hingeline Electro mechanical Actuator written by Kevin Stuart Kendrick and published by . This book was released on 2006 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aircraft control mechanisms, such as those that operate the flaps, ailerons, rudders, etc., are almost exclusively driven by hydraulic-based systems. Their popularity in flight control systems is not unfounded; hydraulic actuators are quite torque-dense and benefit from decades of development bringing operating performance to a high level. On the other hand the infrastructure to support this system increases weight, adds system development complexity, and reduces aircraft maintainability [Jensen et al, 2000]. Based on recent Electro-Mechanical Actuator (EMA) development and design efforts at the Robotics Research Group (RRG), a new opportunity exists to replace current hydraulic flight control systems with those powered by electricity through a national program [Tesar, 2005]. A literature review of the topic found a 30 year old effort by AiResearch to develop a similarly powered hingeline actuator with given traditional performance goals (torque capacity, redundancy, output speed, reliability). In this report,a thorough analysis is performed on each major component group to quantitatively evaluate this baseline device. Using component technologies developed at RRG, this report proposes a dual torque-summing electromechanical actuator, each with a star compound / hypocyclic combined gear train, designed to exceed the performance of the original (1976) AiResearch project. This preliminary design exercise includes a layout of the entire actuator along with an appropriate analysis of major components including bearings, gear train, motor, housing, and release mechanism. The performance of this gear train is critical to overall actuator success and fundamental analytics have already been developed in this area [Park and Tesar, 2005]. Finite Element Analysis on the gear train and housing provide early design feedback and verification of actuator performance characteristics. In particular, simulation results show the gear stiffness, load sharing, and torque capacities exceed analytical estimates. Finally, four different comparisons are presented that evaluate configuration variations of the two designs based on applicable performance criteria. Results show the RRG fault-tolerant actuator has a marked improvement over the baseline in average stiffness (14.2x), reflected inertia (3.2x) and nominal torque density (3.4x). The chapter next lists actuator test methods and aircraft qualification standards. Finally, a summary of future work is detailed in a ten step outline to bring this EMA technology to a level of early deployment in a large range of aircraft systems.

Download or read book Development of a New Fully Flexible Hydraulic Variable Valve Actuation System written by Mohammad Pournazeri and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The automotive industry has been in a marathon of advancement over the past decades. This is partly due to global environmental concerns about increasing amount of air pollutants such as NOx (oxides of nitrogen), CO (carbon monoxide) and particulate matters (PM) and decreasing fossil fuel resources. Recently due to stringent emission regulations such as US EPA (Environmental Protection Agency) and CARB (California Air Resource Board), improvement in fuel economy and reduction in the exhaust gas emissions have become the two major challenges for engine manufacturers. To fulfill the requirements of these regulations, the IC engines including gasoline and diesel engines have experienced significant modifications during the past decades. Incorporating the fully flexible valvetrains in production IC engines is one of the several ways to improve the performance of these engines. The ultimate goal of this PhD thesis is to conduct feasibility study on development of a reliable fully flexible hydraulic valvetrain for automotive engines. Camless valvetrains such as electro-hydraulic, electro-mechanical and electro-pneumatic valve actuators have been developed and extensively studied by several engine component manufacturers and researchers. Unlike conventional camshaft driven systems and cam-based variable valve timing (VVT) techniques, these systems offer valve timings and lift control that are fully independent of crankshaft position and engine speed. These systems are key technical enablers for HCCI, 2/4 stroke-switching gasoline and air hybrid technologies, each of which is a high fuel efficiency technology. Although the flexibility of the camless valvetrains is limitless, they are generally more complex and expensive than cam-based systems and require more study on areas of reliability, fail safety, durability, repeatability and robustness. On the contrary, the cam-based variable valve timing systems are more reliable, durable, repeatable and robust but much less flexible and much more complex in design. In this research work, a new hydraulic variable valve actuation system (VVA) is proposed, designed, prototyped and tested. The proposed system consists of a two rotary spool valves each of which actuated either by a combination of engine crankshaft and a phase shifter or by a variable speed servo-motor. The proposed actuation system offers the same level of flexibility as camless valvetrains while its reliability, repeatability and robustness are comparable with cam driven systems. In this system, the engine valve opening and closing events can be advanced or retarded without any constraint as well as the final valve lift. Transition from regenerative braking or air motor mode to conventional mode in air hybrid engines can be easily realized using the proposed valvetrain. The proposed VVA system, as a stand-alone unit, is modeled, designed, prototyped and successfully tested. The mathematical model of the system is verified by the experimental data and used as a numerical test bench for evaluating the performance of the designed control systems. The system test setup is equipped with valve timing and lift controllers and it is tested to measure repeatability, flexibility and control precision of the valve actuation system. For fast and accurate engine valve lift control, a simplified dynamic model of the system (average model) is derived based on the energy and mass conservation principles. A discrete time sliding mode controller is designed based on the system average model and it is implemented and tested on the experimental setup. To improve the energy efficiency and robustness of the proposed valve actuator, the system design parameters are subjected to an optimization using the genetic algorithm method. Finally, an energy recovery system is proposed, designed and tested to reduce the hydraulic valvetrain power consumption. The presented study is only a small portion of the growing research in this area, and it is hoped that the results obtained here will lead to the realization of a more reliable, repeatable, and flexible engine valve system.

Download or read book Design and Test of a High Power Electromechanical Actuator for Thrust Vector Control written by J. R. Cowan and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Electro Mechanical Actuator DC Resonant Link Controller written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-24 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes the work performed on the 68 HP electro-mechanical actuator (EMA) system developed on NASA contract for the Electrical Actuation (ELA) Technology Bridging Program. The system was designed to demonstrate the capability of large, high power linear ELAs for applications such as Thrust Vector Control (TVC) on rocket engines. It consists of a motor controller, drive electronics and a linear actuator capable of up to 32,00 lbs loading at 7.4 inches/second. The drive electronics are based on the Resonant DC link concept and operate at a nominal frequency of 55 kHz. The induction motor is a specially designed high speed, low inertia motor capable of a 68 peak HP. The actuator was originally designed by MOOG Aerospace under an internal R & D program to meet Space Shuttle Main Engine (SSME) TVC requirements. The design was modified to meet this programs linear rate specification of 7.4 inches/second. The motor and driver were tested on a dynamometer at the Martin Marietta Space Systems facility. System frequency response, step response and force-velocity tests were conducted at the MOOG Aerospace facility. A complete description of the system and all test results can be found in the body of the report. Schreiner, Kenneth E. Glenn Research Center NASA-CR-198510, NAS 1.26:198510, E-10372 NAS3-25799; RTOP 242-50-05...

Download or read book Advanced Design Methods for Electromechanical Actuators written by Stewart Andrew Vaculik and published by . This book was released on 2004 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt: The basic components of electromechanical actuators include geartrains, prime movers, bearings, shafts, sensors, cooling components, and fasteners. A common requirement that drives a typical actuator design process is providing the output torque and speed needed for the given actuator task in a minimum volume/weight geometry. Two important questions to be answered in this research relate to the scaling and configuration management of an electromechanical actuator design. The first question is: "Given an electromechanical actuator design, how can it be scaled to produce another design that meets a different set of requirements (e.g., torque, speed, weight, life)?" The second question is: "Given an electromechanical actuator design, how can a designer change the configuration to obtain another design that meets the same set of requirements in a different geometric package/shape?" The answers to these questions rely on the development of a science of design process for electromechanical actuators to replace the current design process, which is based primarily on designer experience and often requires multiple design iterations. The Robotics Research Group (RRG) is currently working on this science of design process, which includes parametric design rules that can be used to reveal how actuator design parameters affect its key performance indicators. To improve this science, this research develops a detailed parametric model of the primary actuator components for a standard actuator, summarizes the design rules available from this model, formally defines the concepts of scaling and configuration management, and lays out a step-by-step process to implement these concepts. The parametric model used in this research builds on the existing models of previous RRG researchers. The design rules are developed based on the fundamental modeling equations that govern the design of the actuator components. The concepts of scaling and configuration management are defined as two of the fundamental design operations that can be applied to an electromechanical actuator. A scaling and configuration management process, which requires the parametric model, is developed and applied to an existing set of baseline actuator designs. The result of this process is the creation of actuator designs of intermediate size between the sizes of existing actuators, which makes it suitable for populating an actuator family. To handle the size and complexity of the actuator parametric model, this research introduces the model reduction technique of monotonicity analysis and illustrates how it is well suited for the electromechanical actuator design problem. A future goal of the RRG is to create a software tool that will contain a complete actuator parametric model, component design rules (of this and future research), and scaling and configuration management options, which will allow users to design actuators with a minimum amount of time, cost, and knowledge

Download or read book The High Speed Electromechanical Actuator written by Burkhard Deter and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Valve Actuators written by Chris Warnett and published by . This book was released on 2015-10-14 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new book is intended as a guide for automated valve end users, engineers and valve industry professionals that need to understand valve actuators. It describes the various types of electric and fluid powered actuators in terms of design, power supplies, controls and sizing. The reader is taken through the logical steps of selecting the correct actuator for their application, including isolating, modulating and fail safe variations. There are sections on matching actuators to new valves and also retrofitting actuators to existing valves. Examples of where actuators are found in various industrial applications and a comprehensive technical appendix make this book a valuable reference manual.PREVIEWS -"An amazing job of explaining and illustrating actuators, and of course the engineering principles. We need engineering books like this: ones that explain engineering in a well written and digestible form".....Sir James Dyson"This book covers the many and varied types of actuator designs. It helps users understand the type of actuator which is suitable for a particular valve and application. This is an easy to access reference work on all you will ever need to know about valve actuators."......... Bill Whiteley, Chairman Spirax Sarco Engineering Plc and former CEO Rotork Plc."This book should be on every engineer's bookshelf that works in the process or process control industry. It provides the link between the valve and the process. The reader is led through the process of application, selection, sizing, system design and specifying of the actuator."........ Edward Stillwell, PE Control System Engineer

Download or read book MODEL AIDED DESIGN OF A HIGH PERFORMANCE FLY BY WIRE ACTUATOR BASED ON A GLOBAL MODELLING OF THE ACTUATION SYSTEM USING BOND GRAPHS written by Clément Coïc and published by . This book was released on 2016 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to introduce new functions in helicopter flight controls, it is necessary to increase the bandwidths of their actuators. A realistic modelling of the entire actuating system, taking into account its power limitations and its energy consumption, as well as the improvement of the existing sealing and guiding device technologies are the two main challenges to reach the desired high frequency without reducing dramatically the actuator lifespan. To support this new development, this work is organized in three parts. A first part presents the state of the art of the helicopter flight controls. A generic actuator architecture is proposed as well as the associated terminology. A second part deals with the development of a detailed knowledge-model using the Bond-graph formalism for the actuating system. A particular effort is made to standardize the components and their interfaces in an object-oriented approach. The last part deals with the sealing and guiding devices of flight control cylinders. Given the objective of using fluid bearings, the various ways of generating a normal force within a fluid film are analyzed. Then, a more detailed study of the hydrostatic thrust bearings and the conical hybrid bearings is then carried out taking into account the constraints specific to aeronautics. All the knowledge acquired is applied to a concrete case of development, aided by the models, of high frequency actuators for the active control of a rotor.

Download or read book Design of a Controller for an Electromechanical Actuator Using Quantitative Performance Criteria written by L. Allen Robins and published by . This book was released on 1989 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Electric Drives and Electromechanical Systems written by Richard Crowder and published by Butterworth-Heinemann. This book was released on 2019-10-19 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electric Drives and Electromechanical Devices: Applications and Control, Second Edition, presents a unified approach to the design and application of modern drive system. It explores problems involved in assembling complete, modern electric drive systems involving mechanical, electrical, and electronic elements. This book provides a global overview of design, specification applications, important design information, and methodologies. This new edition has been restructured to present a seamless, logical discussion on a wide range of topical problems relating to the design and specification of the complete motor-drive system. It is organised to establish immediate solutions to specific application problem. Subsidiary issues that have a considerable impact on the overall performance and reliability, including environmental protection and costs, energy efficiency, and cyber security, are also considered. Presents a comprehensive consideration of electromechanical systems with insights into the complete drive system, including required sensors and mechanical components Features in-depth discussion of control schemes, particularly focusing on practical operation Includes extensive references to modern application domains and real-world case studies, such as electric vehicles Considers the cyber aspects of drives, including networking and security

Download or read book Electromechanical Actuator Development for Integrated Chatter Prediction on High Speed Machining Centers written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Machine tool chatter imposes limitations on the productivity and quality of modern high speed machining (HSM) operations. It has been shown that chatter prediction and avoidance strategies can lead to increased machining productivity if certain modal characteristics of the machine are known. The objectives of this research are to design and demonstrate an electromechanical actuator (EMA) to easily and accurately identify these characteristics. Design specifications for this actuator reflect a wide range of machine tools and operating conditions. A simulation-based design strategy is employed, based on traditional electromechanical analysis, finite element analysis (FEA), and computer simulations to ensure performance meets the design specifications. A prototype EMA system is built to validate the analytical results and demonstrate its capabilities as part of an automated chatter prediction and avoidance system. The EMA is shown to generate the required modal characteristics, namely frequency response functions (FRFs) and stability lobe diagrams (SLDs) quickly, accurately, and with fewer technical skill requirements than other vibration testing methods. Experimental machining tests demonstrate that the EMA can be an effective component of an integrated chatter prediction and avoidance system.