The Experts below are selected from a list of 3714 Experts worldwide ranked by ideXlab platform
L I Gangqiang - One of the best experts on this subject based on the ideXlab platform.
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warship formation air defense weapon target assignment based on gacr algorithm
Computer Simulation, 2009Co-Authors: L I GangqiangAbstract:Improving the efficiency of air defense weapon-target assignment of warship formation is an urgent mission.Classical methods for solving NP hard problems usually result in exponential complexities,while some intelligent algorithms usually result in local optimum.For resolving the problem of warship formation,a genetic ant algorithm based on crowding replacement is proposed.The genetic algorithm phase adopts crowding technique and changeable mutation operator to maintain multiple populations.So,the ant colony optimization phase can avoid getting into local optimization.An intensive study of how to use this algorithm in warship weapon-target assignment is made.Results demonstrate that the improved algorithm achieves better efficiency than some classical optimization algorithms.
Qing Zhou - One of the best experts on this subject based on the ideXlab platform.
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warship and aircraft coordinated air defense target allocation method based on attack timing
AOPC 2019: AI in Optics and Photonics, 2019Co-Authors: Yunhui Wang, Zhijuan Zhan, Pingyu Deng, Qing ZhouAbstract:The integrated and coordinated operation of Warships and aircraft is the core issue of air-sea battle control. Ship antiaircraft and carrier-based aircraft are vigilant in different airspaces. In the face of uncertain threats, the defense effects of ships and aircraft are different, and in order to avoid the overlap between ship firepower and aircraft firepower, The assignment of goals becomes very important. Based on the zoning principle of warship and aircraft cooperative defense, this paper proposes a target attack time calculation method for combat situation. By calculating the estimated time of the attack and threat of the ship and the aircraft at the current position as the estimated interception time, factors such as the maneuver time of the aircraft, the flight time of the weapon, and the interception area need to be considered. Based on this method, the target grouping algorithm with minimum target intercept time is given. According to the algorithm, the warship-to-aircraft cooperative air defense is realized. The Monte Carlo simulation analysis is carried out on the two combat situations in the dynamic combat simulation platform. By comparing the simulation results, we find that the proposed algorithm can effectively reduce the damage rate of the warship.
Robert W. Ashton - One of the best experts on this subject based on the ideXlab platform.
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genetic algorithm design of an adaptive multirate lqr controller for a multi machine mvdc shipboard electric distribution system with constant power loads
IEEE Transportation Electrification Conference and Expo, 2017Co-Authors: Adam J. Mills, Robert W. AshtonAbstract:Over the last two decades, the US Navy has invested significantly in developing Integrated Power Systems (IPS) on Warships. Future warship classes equipped with IPS are expected to have Medium Voltage DC distribution. DC distribution systems are host to scores of power converters which provide tailored voltage, frequency, and power quality to connected loads. When coupled to high-bandwidth controllers, power converters appear as constant power loads to the distribution system. The negative non-linear impedance associated with constant power loads reduces stability margins and limits the efficacy of linear control methods. The inclusion of megawatt level pulsed loads, such as laser weapons or railguns, further exacerbates the challenge to designers. A recently introduced control scheme, Adaptive Select-Matrix LQR (LQR-SM), is a flexible and adaptable centralized control approach to multi-input, multi-rate, high order systems. This paper presents the design and implementation of the LQR-SM control scheme in a complex hypothetical naval zonal MVDC distribution system that includes: multiple power generating units, multiple active energy storage devices, multiple load zones, and pulsed loads.
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Adaptive, sparse, and multi-rate LQR control of an MVDC shipboard power system with constant power loads
2017 IEEE International Conference on Industrial Technology (ICIT), 2017Co-Authors: Adam J. Mills, Robert W. AshtonAbstract:The US Navy is pursuing development of all-electric Warships. The future all-electric warship is expected to utilize medium-voltage DC (MVDC) main distribution to supply several load zones. The load zones will convert the MVDC power to lower voltage for use by local loads as well as contain local energy storage for casualty back-up power. A majority, if not totality of loads are expected to exhibit constant-power load (CPL) behavior. Voltage instabilities introduced by CPLs and methods to address the problem in multi-machine MVDC systems are reviewed. This paper presents an LQR based, centralized, control scheme to regulate MVDC distribution bus voltage as well as the low-voltage DC (LVDC) service buses through coordinated use of low-bandwidth MVDC voltage sources and high-bandwidth, low-voltage currents sourced from the local energy storage devices. A sparse-feedback, multi-rate LQR controller (LQR-SM) is designed and implemented in MATLAB software using a hypothetical multi-machine, multi-zone shipboard MVDC electric distribution system with CPLs and energy storage devices. The presented control scheme is able to combine and coordinate all available control inputs to effectively regulate MVDC and LVDC buses in the system while allowing for design flexibility not available through existing control schemes.
Zhang Yuzhi - One of the best experts on this subject based on the ideXlab platform.
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research of air defense target assignment for warship formation based on mas
IEEE International Conference on Adaptive Science & Technology, 2011Co-Authors: Wang Lei, Wang Wei, Liu Zhengguo, Qiu Chuchu, Zhang YuzhiAbstract:On the background of air defense war for warship formation with the modern information environment, a Multi-agent System(MAS) model of air defense target assignment for warship formation is proposed by means of the MAS theory and method. An optimization algorithm based on Genetic Algorithm(GA) is used to solve this model, therefore provide a new way for the decision of air defense target assignment for warship formation.
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research on weapon target assignment for surface warship formation with cooperative engagement capability
Fire Control and Command Control, 2009Co-Authors: Zhang YuzhiAbstract:On the base of analyzing the mode of weapon target assignment for surface warship formation with cooperative engagement capability,a MAS model of the weapon target assignment for warship formation is proposed by means of the MAS theory and method,it is described which includes all kinds of physical or logical resource by the Agent,many agent subsystem is connected into a integrated system through network and communication protocols of the Agent.The Agent structure of a mapping entity functions has been designed,therefore provide a new way for the decision of the weapon target assignment for warship formation.
Norbert Doerry - One of the best experts on this subject based on the ideXlab platform.
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history and the status of electric ship propulsion integrated power systems and future trends in the u s navy
Proceedings of the IEEE, 2015Co-Authors: Norbert Doerry, John V Amy, Cy KrolickAbstract:While electric propulsion for Warships has existed for nearly a century, it has only been since the end of the Cold War that modern integrated power systems have been developed and implemented on U.S. Navy Warships. The principal enablers have been the products of research and development for rotating machines (generators and propulsion motors), power electronics (power conversion and motor drives), energy storage, and controls. The U.S. Navy has implemented this advanced technology incrementally. Notably, DDG 1000 with its integrated propulsion system and CVN 78 with its electromagnetic aircraft launch system will soon join the fleet and mark another important advance to the electric warship. In the future, the integration of electric weapons such as railguns, high power radars, and lasers will result in the final achievement of the electric warship.
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Specifications and standards for the electric warship
2013 IEEE Electric Ship Technologies Symposium (ESTS), 2013Co-Authors: Norbert Doerry, K. MoniriAbstract:The U.S. Navy has invested considerable funds in the research and development of electrical power technologies for future electric Warships. One aspect of institutionalizing these technologies is the creation or modification of standards and specifications to incorporate the new technologies. This paper assesses the current state of standards and specifications in support of the design and construction of an all-electric naval warship. These technical documents will be evaluated in terms of the different power systems architectures to include low voltage ac generation, medium voltage ac generation, medium voltage dc generation, and zonal power distribution. Ongoing standards activity, both in industry and in the Navy, are discussed. Finally, the paper presents recommendations for updating existing specifications and standards and the creation of new specifications to cover technical areas where standards do not currently exist.
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sizing power generation and fuel capacity of the all electric warship
Electric Ship Technologies Symposium, 2007Co-Authors: Norbert DoerryAbstract:Current sizing algorithms for warship power generation and fuel tank capacity were developed over forty five years ago when ship service loads were a small fraction of the overall power demand. Electric load growth, particularly with the introduction of high power mission systems, results in ship service maximum margined loads being nearly the same as the maximum propulsion load. In many operating conditions, ship service power demands exceed propulsion demands. This paper proposes new sizing methods for all-electric Warships that are tied to operational effectiveness. These sizing methods are based on mobility mission tactical situations such as high speed transit, economical speed transit, and on station time. Additionally, the methods are sensitive to drag reduction efforts, temperature, and the ability to maintain speed in higher sea states. The goal is to optimize shipboard power and propulsion system life cycle cost while meeting operational requirements.
