摘要 :
There exists an enormous wealth of published material describing the application of, so called, `modern control methods' to the design of flight control systems for piloted aeroplanes. It is also evident, with the exception of a v...
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There exists an enormous wealth of published material describing the application of, so called, `modern control methods' to the design of flight control systems for piloted aeroplanes. It is also evident, with the exception of a very small number of recent applications, that there is a conspicuous lack of enthusiasm on the part of the airframe manufacturers to adopt this design technology, especially for the design of command and stability augmentation systems for piloted aeroplanes. It is possible to speculate on the reasons for this apparent lack of interest, but to do so might well result in a misplaced condemnation of modern control methods. Since evidence exists to suggest that some modern control system design strategies have overlooked important flight dynamics considerations, the discussion is turned around here by drawing attention to some of the more important considerations in command and stability augmentation system design. The object is, therefore, to inform the designer, of whatever persuasion, of the critically important aspects of command and stability augmentation system design for the advanced technology aeroplane.
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CODAC (Control, Data Access and Communication) is the central control system responsible for operating the ITER device. CODAC interfaces to more than 160 plant systems containing actuators, sensors and local control. CODAC is resp...
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CODAC (Control, Data Access and Communication) is the central control system responsible for operating the ITER device. CODAC interfaces to more than 160 plant systems containing actuators, sensors and local control. CODAC is responsible for coordinating and orchestrating the operation of these plant systems including plasma feedback control. CODAC is developed by ITER Organization, while plant systems are developed by the seven ITER parties (China, Europe, India, Japan, Korea, Russia and United States). This procurement model poses enormous challenges, has a big impact on architecture design and requires a strong standardization for better integration and future maintenance. In this paper we briefly describe the CODAC conceptual design, elaborate on the actions taken by the CODAC team to move from conceptual to engineering design during the last year and outline the plans ahead.
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Network enabled capability (NEC) is a new form of command and control and this paper asks whether it is an end product or an initial condition. The traditional top-down approach to design in which 'we, the designers, are designing...
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Network enabled capability (NEC) is a new form of command and control and this paper asks whether it is an end product or an initial condition. The traditional top-down approach to design in which 'we, the designers, are designing something for you, the users', tacitly assumes the former. Yet experience in the field amply demonstrates the inevitability of human adaptability, something that the commercial world is beginning to exploit under headings of 'peer production' or 'mass collaboration'. This paper takes these insights and aims to advance an agenda for an evolutionary approach to NEC system design. A longitudinal study is presented to examine user adaptation when faced with two initial conditions: NEC and classic command and control. The results suggest that NEC does indeed fulfill its ambitions in terms of agility and coping with complexity, but in an unanticipated way. Despite having the facility for peer-to-peer interaction in the NEC condition, the team chose not to use it; in effect, they created a kind of high speed hierarchy. The outcomes and processes of adaptation are examined using the Event Analysis for Systemic Teamwork (EAST) method. An evolutionary approach to NEC system design presents itself as a promising avenue for future research. Relevance to industry: Findings of this nature are much needed in the military domain, where the tenets of digitisation and the transformation to network centric operations, and moreover the role of humans within this transformation, require an empirical basis.
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This paper presents resource management techniques that achieve the quality of service(QoS) require- ments of dynamic real-time systems using open architectures and commercial off-the-shelf technologies (COTS). Dynamic real-time s...
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This paper presents resource management techniques that achieve the quality of service(QoS) require- ments of dynamic real-time systems using open architectures and commercial off-the-shelf technologies (COTS). Dynamic real-time systems are subject to constant changes such as a varying external environment, overload of Internal systems, component failure, and evolving operational requirements. Examples of such systems include The emerging generation of computer-based, command and control systems of the U.S.Navy.
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One of the main goals in transforming the Army is the process of moving away from the use of paper maps and grease pencils into more embedded and computer-oriented forms of command and control. There are currently many weapons pla...
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One of the main goals in transforming the Army is the process of moving away from the use of paper maps and grease pencils into more embedded and computer-oriented forms of command and control. There are currently many weapons platforms trying to achieve this function; however, each platform is developing their own solution to meet individual needs. The Army as a whole needs to standardize on a single path forward to ensure that all systems can communicate across the digitized battlefield, allow for each platform to have a "common picture," and promote software reuse across the Army. Once this "common picture" is achieved, the armed forces will have the information needed to continue domination of the battlefield.
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摘要 :
One of the main goals in transforming the Army is the process of moving away from the use of paper maps and grease pencils into more embedded and computer-oriented forms of command and control. There are currently many weapons pla...
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One of the main goals in transforming the Army is the process of moving away from the use of paper maps and grease pencils into more embedded and computer-oriented forms of command and control. There are currently many weapons platforms trying to achieve this function; however, each platform is developing their own solution to meet individual needs. The Army as a whole needs to standardize on a single path forward to ensure that all systems can communicate across the digitized battlefield, allow for each platform to have a "common picture," and promote software reuse across the Army. Once this "common picture" is achieved, the armed forces will have the information needed to continue domination of the battlefield.
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The authors present a literature review of command and control, linking sociological elements of academic research to military research in a novel way. They will discuss task modeling literature (seen in human machine interaction ...
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The authors present a literature review of command and control, linking sociological elements of academic research to military research in a novel way. They will discuss task modeling literature (seen in human machine interaction studies), general aspects of collectives and military and academic research on command and control, studies of autonomous systems and considerations of interactions between humans and autonomous agents. Based on the survey and associations between aspects from these fields, the authors compose a recommendation list for aspects crucial to building of information systems capable of achieving their true capability, through command and control.
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This paper tackles the development of distributed control reconfiguration and fault accommodation strategies for consensus achievement in multiagent systems in the presence of faulty agents whose actuators are unable to produce th...
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This paper tackles the development of distributed control reconfiguration and fault accommodation strategies for consensus achievement in multiagent systems in the presence of faulty agents whose actuators are unable to produce their nominal control efforts. A faulty agent can adversely affect and prevent the team from reaching agreement and lead to catastrophic mission performance degradations. To ensure that the faulty team pursues its consensus objectives, in this paper, on-line distributed control reconfiguration strategies are developed that employ only nearest neighbor information to guarantee the team consensus while minimizing a local cost performance index. Toward the above end, the distributed Hamilton-Jacobi-Bellman equations for the faulty agent are derived and novel reconfigured controllers are designed by solving the above equations subject to the faulty agent dynamics and network structure constraints to ensure fault accommodation of the entire team. Our proposed reconfigurable controllers are applied to a network of autonomous underwater vehicles subject to actuator faults to demonstrate and illustrate the effectiveness and capabilities of our proposed fault recovery control strategies.
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In many application areas, including control systems, careful management of system resources is key to providing the best application performance. Traditional control systems with multiple control loops statically allocate a fixed...
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In many application areas, including control systems, careful management of system resources is key to providing the best application performance. Traditional control systems with multiple control loops statically allocate a fixed portion of the system resources to each controller based on their average or worst-case resource requirements. However, controllers'' resource needs vary depending on the jobs they perform and the state of the systems they control. A controller of a plant operating close to its equilibrium requires fewer resources than a controller of a plant operating far from its equilibrium point. The Draco dynamic rate control system exploits this fact by dynamically allocating resources to control systems based on system state. Our research demonstrates that Draco provides significantly better overall control performance with much less resources than static controllers. Our experimental evaluation shows that in the control scenarios we examined Draco provides up to 25% better control performance with 30% less resources.
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Inside a direct-drive servo-valve (DDV), the motion of the spool controlling the direction of the hydraulic fluid flow is directly actuated by an electrical motor. Due to the small stroke needed, it is possible to use a linear amp...
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Inside a direct-drive servo-valve (DDV), the motion of the spool controlling the direction of the hydraulic fluid flow is directly actuated by an electrical motor. Due to the small stroke needed, it is possible to use a linear amplified piezoelectric actuator directly connected to the spool. The aim of this paper is to investigate how to design the power and control electronics of a DDV based on a linear amplified piezoelectric actuator to take full advantage of such a motor. In particular, it will be shown that the voltage applied on the piezoelectric stacks may be successfully controlled by use of four-quadrant choppers with the benefits that the injected electrical charge stored in their capacity can be recovered. This leads to the low-consumption scheme presented which can be easily fed by a boost converter from the aircraft 28 Vdc.
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