Author: Mark R. Jolly
Publisher:
ISBN:
Category : Flight simulators
Languages : en
Pages : 18
Book Description
"Hydraulic servoactuators have long been used in industry where high performance precision motion control is required. Because of their precision and ability to generate large forces, applications are numerous in industry. One such application provides cockpit motion for flight simulation. This thesis investigates a new emergency shutdown (abort) scheme for such high performance servo-systems. Because flight simulation involves the motion control of both man and machinery (a mock cockpit in motion), it will be used as the standard by which a safe and effective abort is modeled. The justification for motion abort during actuator operation is unsafe actuator accelerations. In order to protect man and equipment, the operation of critical servosystems, such as flight simulators, must be constantly monitored to detect system malfunctions which might cause personal injury or equipment damage. After any malfunction is detected, the appropriate shutdowm hardware must be signaled to safely take command of the servosystem and bring it to rest. The intent of this thesis was to verify the integrity of a new concept in hydraulic actuator abort, which utilizes the mechanical feedback of actuator acceleration. Once verified, critical design parameters can be further optimized and possible design configurations suggested. The abort system was modeled on a software package called Continuous System Modelling Program (CSMP). The actual abort subsystem proved to work as expected, but when integrated into the flight simulation actuation system, instability was observed. This instability occurred due to extremely large inertial forces acting on relatively large volumes of compressible hydraulic fluid. The spring rate imposed by the hydraulic fluid caused high frequency oscillations, superimposed on the desired steady state behavior, to pass through the entire system. Various loop gains in the model were adjusted to minimize the oscillations, but an additional dampening device would be the likely solution to effectively attenuate the instability. Such a device could be the topic of another thesis."--Abstract.
The Controlled Shutdown of a Hydraulic Servo-system Using Acceleration Feedback
Author: Mark R. Jolly
Publisher:
ISBN:
Category : Flight simulators
Languages : en
Pages : 18
Book Description
"Hydraulic servoactuators have long been used in industry where high performance precision motion control is required. Because of their precision and ability to generate large forces, applications are numerous in industry. One such application provides cockpit motion for flight simulation. This thesis investigates a new emergency shutdown (abort) scheme for such high performance servo-systems. Because flight simulation involves the motion control of both man and machinery (a mock cockpit in motion), it will be used as the standard by which a safe and effective abort is modeled. The justification for motion abort during actuator operation is unsafe actuator accelerations. In order to protect man and equipment, the operation of critical servosystems, such as flight simulators, must be constantly monitored to detect system malfunctions which might cause personal injury or equipment damage. After any malfunction is detected, the appropriate shutdowm hardware must be signaled to safely take command of the servosystem and bring it to rest. The intent of this thesis was to verify the integrity of a new concept in hydraulic actuator abort, which utilizes the mechanical feedback of actuator acceleration. Once verified, critical design parameters can be further optimized and possible design configurations suggested. The abort system was modeled on a software package called Continuous System Modelling Program (CSMP). The actual abort subsystem proved to work as expected, but when integrated into the flight simulation actuation system, instability was observed. This instability occurred due to extremely large inertial forces acting on relatively large volumes of compressible hydraulic fluid. The spring rate imposed by the hydraulic fluid caused high frequency oscillations, superimposed on the desired steady state behavior, to pass through the entire system. Various loop gains in the model were adjusted to minimize the oscillations, but an additional dampening device would be the likely solution to effectively attenuate the instability. Such a device could be the topic of another thesis."--Abstract.
Publisher:
ISBN:
Category : Flight simulators
Languages : en
Pages : 18
Book Description
"Hydraulic servoactuators have long been used in industry where high performance precision motion control is required. Because of their precision and ability to generate large forces, applications are numerous in industry. One such application provides cockpit motion for flight simulation. This thesis investigates a new emergency shutdown (abort) scheme for such high performance servo-systems. Because flight simulation involves the motion control of both man and machinery (a mock cockpit in motion), it will be used as the standard by which a safe and effective abort is modeled. The justification for motion abort during actuator operation is unsafe actuator accelerations. In order to protect man and equipment, the operation of critical servosystems, such as flight simulators, must be constantly monitored to detect system malfunctions which might cause personal injury or equipment damage. After any malfunction is detected, the appropriate shutdowm hardware must be signaled to safely take command of the servosystem and bring it to rest. The intent of this thesis was to verify the integrity of a new concept in hydraulic actuator abort, which utilizes the mechanical feedback of actuator acceleration. Once verified, critical design parameters can be further optimized and possible design configurations suggested. The abort system was modeled on a software package called Continuous System Modelling Program (CSMP). The actual abort subsystem proved to work as expected, but when integrated into the flight simulation actuation system, instability was observed. This instability occurred due to extremely large inertial forces acting on relatively large volumes of compressible hydraulic fluid. The spring rate imposed by the hydraulic fluid caused high frequency oscillations, superimposed on the desired steady state behavior, to pass through the entire system. Various loop gains in the model were adjusted to minimize the oscillations, but an additional dampening device would be the likely solution to effectively attenuate the instability. Such a device could be the topic of another thesis."--Abstract.
Vertical Motion Simulator Familiarization Guide
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 68
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 68
Book Description
The Shock and Vibration Bulletin
Author:
Publisher:
ISBN:
Category : Shock (Mechanics)
Languages : en
Pages : 1156
Book Description
Publisher:
ISBN:
Category : Shock (Mechanics)
Languages : en
Pages : 1156
Book Description
Conference Publication
Author:
Publisher:
ISBN:
Category : Artificial satellites in telecommunication
Languages : en
Pages : 970
Book Description
Publisher:
ISBN:
Category : Artificial satellites in telecommunication
Languages : en
Pages : 970
Book Description
Hydraulics & Pneumatics
Author:
Publisher:
ISBN:
Category : Fluid power technology
Languages : en
Pages : 888
Book Description
The Jan. 1956 issue includes Fluid power engineering index, 1931-55.
Publisher:
ISBN:
Category : Fluid power technology
Languages : en
Pages : 888
Book Description
The Jan. 1956 issue includes Fluid power engineering index, 1931-55.
Instrumentation Technology
Author:
Publisher:
ISBN:
Category : Scientific apparatus and instruments
Languages : en
Pages : 846
Book Description
Publisher:
ISBN:
Category : Scientific apparatus and instruments
Languages : en
Pages : 846
Book Description
Electrical Engineer's Reference Book
Author: G R Jones
Publisher: Elsevier
ISBN: 1483292037
Category : Technology & Engineering
Languages : en
Pages : 1392
Book Description
A long established reference book: radical revision for the fifteenth edition includes complete rearrangement to take in chapters on new topics and regroup the subjects covered for easy access to information.The Electrical Engineer's Reference Book, first published in 1945, maintains its original aims: to reflect the state of the art in electrical science and technology and cater for the needs of practising engineers. Most chapters have been revised and many augmented so as to deal properly with both fundamental developments and new technology and applications that have come to the fore since the fourteenth edition was published (1985). Topics covered by new chapters or radically updated sections include: * digital and programmable electronic systems * reliability analysis * EMC * power electronics * fundamental properties of materials * optical fibres * maintenance in power systems * electroheat and welding * agriculture and horticulture * aeronautic transportation * health and safety * procurement and purchasing * engineering economics
Publisher: Elsevier
ISBN: 1483292037
Category : Technology & Engineering
Languages : en
Pages : 1392
Book Description
A long established reference book: radical revision for the fifteenth edition includes complete rearrangement to take in chapters on new topics and regroup the subjects covered for easy access to information.The Electrical Engineer's Reference Book, first published in 1945, maintains its original aims: to reflect the state of the art in electrical science and technology and cater for the needs of practising engineers. Most chapters have been revised and many augmented so as to deal properly with both fundamental developments and new technology and applications that have come to the fore since the fourteenth edition was published (1985). Topics covered by new chapters or radically updated sections include: * digital and programmable electronic systems * reliability analysis * EMC * power electronics * fundamental properties of materials * optical fibres * maintenance in power systems * electroheat and welding * agriculture and horticulture * aeronautic transportation * health and safety * procurement and purchasing * engineering economics
Engineers' Digest
Author:
Publisher:
ISBN:
Category : Engineering
Languages : en
Pages : 558
Book Description
Publisher:
ISBN:
Category : Engineering
Languages : en
Pages : 558
Book Description
Proceedings
Author:
Publisher:
ISBN:
Category : Aeronautical instruments
Languages : en
Pages : 354
Book Description
Publisher:
ISBN:
Category : Aeronautical instruments
Languages : en
Pages : 354
Book Description
Friction Stir Welding
Author: Daniela Lohwasser
Publisher: Elsevier
ISBN: 1845697715
Category : Technology & Engineering
Languages : en
Pages : 437
Book Description
Friction stir welding (FSW) is a highly important and recently developed joining technology that produces a solid phase bond. It uses a rotating tool to generate frictional heat that causes material of the components to be welded to soften without reaching the melting point and allows the tool to move along the weld line. Plasticized material is transferred from the leading edge to trailing edge of the tool probe, leaving a solid phase bond between the two parts. Friction stir welding: from basics to applications reviews the fundamentals of the process and how it is used in industrial applications.Part one discusses general issues with chapters on topics such as basic process overview, material deformation and joint formation in friction stir welding, inspection and quality control and friction stir welding equipment requirements and machinery descriptions as well as industrial applications of friction stir welding. A chapter giving an outlook on the future of friction stir welding is included in Part one. Part two reviews the variables in friction stir welding including residual stresses in friction stir welding, effects and defects of friction stir welds, modelling thermal properties in friction stir welding and metallurgy and weld performance.With its distinguished editors and international team of contributors, Friction stir welding: from basics to applications is a standard reference for mechanical, welding and materials engineers in the aerospace, automotive, railway, shipbuilding, nuclear and other metal fabrication industries, particularly those that use aluminium alloys. Provides essential information on topics such as basic process overview, materials deformation and joint formation in friction stir welding Inspection and quality control and friction stir welding equipment requirements are discussed as well as industrial applications of friction stir welding Reviews the variables involved in friction stir welding including residual stresses, effects and defects of friction stir welds, modelling thermal properties, metallurgy and weld performance
Publisher: Elsevier
ISBN: 1845697715
Category : Technology & Engineering
Languages : en
Pages : 437
Book Description
Friction stir welding (FSW) is a highly important and recently developed joining technology that produces a solid phase bond. It uses a rotating tool to generate frictional heat that causes material of the components to be welded to soften without reaching the melting point and allows the tool to move along the weld line. Plasticized material is transferred from the leading edge to trailing edge of the tool probe, leaving a solid phase bond between the two parts. Friction stir welding: from basics to applications reviews the fundamentals of the process and how it is used in industrial applications.Part one discusses general issues with chapters on topics such as basic process overview, material deformation and joint formation in friction stir welding, inspection and quality control and friction stir welding equipment requirements and machinery descriptions as well as industrial applications of friction stir welding. A chapter giving an outlook on the future of friction stir welding is included in Part one. Part two reviews the variables in friction stir welding including residual stresses in friction stir welding, effects and defects of friction stir welds, modelling thermal properties in friction stir welding and metallurgy and weld performance.With its distinguished editors and international team of contributors, Friction stir welding: from basics to applications is a standard reference for mechanical, welding and materials engineers in the aerospace, automotive, railway, shipbuilding, nuclear and other metal fabrication industries, particularly those that use aluminium alloys. Provides essential information on topics such as basic process overview, materials deformation and joint formation in friction stir welding Inspection and quality control and friction stir welding equipment requirements are discussed as well as industrial applications of friction stir welding Reviews the variables involved in friction stir welding including residual stresses, effects and defects of friction stir welds, modelling thermal properties, metallurgy and weld performance