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Copyright of Systems Engineering & Electronics is the property of Journal of Systems Engineering & Electronics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Systems Engineering & Electronics is the property of Journal of Systems Engineering & Electronics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The aircraft carrier is the storage and transportation platform of air-to-air missiles, and the carrier aircraft is the launching platform of air-to-air missiles. Air-to-air missile, carrier and aircraft interact with each other, therefore, the research on the suitability of air-to-air missile, carrier and aircraft must be carried out to ensure the safe and reliable use of air-to-air missiles on carrier, reduce the time of support process, and maintain the operational requirements of efficient fire strike. Based on the understanding of the suitability of aircraft-missile and carrier-missile, this paper combs the influencing factors for air-to-air missiles on carrier from three aspects: operational environment suitability, support suitability and safety suitability, and puts forward the design requirements for carrier-missile suitability. The study can provide reference for relevant work.

Aiming at the problem of the recovery sequencing and scheduling of the carrier aircraft fleet landing, the carrier deck environment and the return recovery approach mode of the carrier aircraft are analyzed firstly, and the evaluation index model of the recovery sequencing and scheduling based on the weighted waiting time is established. According to the various constraints in the recovery sequencing and scheduling problem of the carrier aircraft, the model of the recovery sequencing and scheduling problem of the carrier aircraft considering the air refueling condition is established. Then, according to the established recycling sequencing and scheduling model and the idea of huper-heuristic algorithm, a genetic programming with mandatory landing rules (MGP) algorithm is designed to solve the ship necovery scheduling problem. Further, the effectiveness of the proposed recovery sequencing and scheduling model and MGP algorithm is verified by simulation examples, and the advantages of MGP algorithm are verified by comparison with genetic algorithm, pure heuristic algorithm and common genetic programming algorithm. Finally, based on the simulation results of an example, the influence of escape and wave off on the landing fleet recovery scheme is analyzed. [ABSTRACT FROM AUTHOR]

Copyright of Aero Weaponry is the property of Aero Weaponry Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In the process of carrier landing, the carrier air wake affects the height and speed of carrier aircraft, resulting in landing deviation and even going around. Aiming at the problem of poor accuracy of landing point caused by carrier air wake, this paper firstly introduces the traditional power compensation scheme with constant speed and the traditional power compensation scheme with constant angle of attack, and it improves the power compensator scheme with constant angle of attack to reduce the coupling between longitudinal height channel and speed channel, which can reduce the influence of carrier air wake on the control accuracy of glide path. The effects of three schemes on suppressing the steady component of carrier air wake are compared through numerical simulation. The simulation results show that the improved power compensation scheme with constant angle of attack can effectively suppress the influence of the vertical component of carrier air wake and reduce the influence of the horizontal component of carrier air wake.

Copyright of Aero Weaponry is the property of Aero Weaponry Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Coordinated taxiing planning for multiple aircraft on flight deck is of vital importance which can dramatically improve the dispatching efficiency. In this paper, first, the coordinated taxiing path planning problem is transformed into a centralized optimal control problem where collision-free conditions and mechanical limits are considered. Since the formulated optimal control problem is of large state space and highly nonlinear, an efficient hierarchical initialization technique based on the Dubins-curve method is proposed. Then, a model predictive controller is designed to track the obtained reference trajectory in the presence of initial state error and external disturbances. Numerical experiments demonstrate that the proposed “offline planning + online tracking” framework can achieve efficient and robust coordinated taxiing planning and tracking even in the presence of initial state error and continuous external disturbances.

Copyright of Systems Engineering & Electronics is the property of Journal of Systems Engineering & Electronics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

With the development of modern military ship equipment, the airspace operation environment of shipboard aircraft is becoming increasingly complex. The objective and accurate evaluation of ship-terminal capacity is the basis of air traffic flow management for shipboard aircraft, and it is also the premise of improving the efficiency of airspace resources. First of all, this paper divides the airspace and ship terminal areas and realizes the route network planning for the arrival and departure of shipboard aircraft. Following this, according to the airspace characteristics of the ship terminal area and the operation process of the shipboard aircraft, an arrival-and-departure network flow model for shipboard aircraft is established by using capacity-limitation and flow-conservation conditions. Finally, simulated annealing (SA) is used to solve the maximum flow in the arrival-and-departure network flow model, and the capacity evaluation results of the ship terminal area are obtained. The results show that when the number of gates is ng ≥ 7, the bottleneck in the ship terminal area's operation capacity is the deck runway. When 3 ≤ ng < 7, imbalanced take-off and landing tasks lead to a waste of runway resources, and when ng < 3, the number of gates becomes the bottleneck which limits the capacity. With the number of gates being reduced from seven to three, the capacity is reduced from twenty sorties per hour to six sorties per hour. The model and core idea proposed in this paper can not only quickly evaluate the capacity of the terminal area of ships but also provide a solid foundation for the development of future fleet groups and the full use of maritime airspace. [ABSTRACT FROM AUTHOR]

Copyright of Frontiers of Information Technology & Electronic Engineering is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Systems Engineering & Electronics is the property of Journal of Systems Engineering & Electronics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Based on the concepts of the reciprocal velocity obstacle (RVO) and Dubins methods, an improved Dubins-RVO method that can be applied to the scenario with noncircular obstacles is developed. Based on the Dubins-RVO method and one-sided Symplectic Pseudospectral method, a multiaircraft collaborative trajectory planning method was proposed. The kinematic constraint and terminal boundary conditions can be strictly satisfied in the proposed compound trajectory planning method. In addition, a symplectic pseudospectral receding horizon control (RHC) controller is designed to solve the trajectory tracking problem where the constraints on the state and control variables are considered. The proposed compound trajectory planning method is first applied to a two-aircraft problem. The obtained results demonstrate that compared to the RVO and Dubins-RVO methods, the proposed method can effectively avoid the “dead-lock” phenomenon and generate feasible trajectory efficiently satisfying all constraints. In addition, simulation experiment for four aircrafts is conducted. Smooth trajectories are obtained. Despite the presence of disturbances in the environment, the trajectories can be tracked with high precision using the symplectic pseudospectral RHC controller. [ABSTRACT FROM AUTHOR]

Previous studies focused on deck-disposed and trajectory planning problem separately, and there was no systematic study from the whole process. This paper studied sortie scheduling for carrier aircrafts from the perspective of the whole scheduling and dispatch process. According to the process of sortie on flight deck, the sortie task was abstracted into six virtual stages, namely, deck-disposed, taxiing to preparing spot, taxiing from preparing spot to catapult, preparation on the catapult, takeoff, and cooling and recovery for the jet blast deflectors, and, the corresponding machines were also defined, respectively. The constraints were expressed, and the sortie scheduling model was build based on hybrid flexible flowshop scheduling. In addition, the one-sided symplectic pseudospectral method and the proposed collision avoidance strategy based on priority principle were combined to realize the collaborative trajectories planning of taxiing for multiple aircrafts. To obtain the optimal or near optimal solution, the double-layer genetic algorithm was proposed. Finally, the experiments were carried out based on the Nimitz-class aircraft carrier; the sortie task of 8 aircrafts under unknown conditions of deck-disposed and 13 aircrafts with fixed deck-disposed were studied, respectively. Experimental results show that the established model can well describe the sortie of aircraft, and it meets all constraints and actual requirements, which shows that the proposed method and the model can be used for sortie task effectively. [ABSTRACT FROM AUTHOR]

Copyright of Systems Engineering & Electronics is the property of Journal of Systems Engineering & Electronics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Enhancing operation efficiency of flight deck has become a hotspot because it has an important impact on the fighting capacity of the carrier–aircraft system. To improve the operation efficiency, aircraft need taxi to the destination on deck with the optimal trajectory. In this paper, a general method is proposed to solve the trajectory optimization problem for aircraft taxiing on flight deck considering that the existing methods can only deal with the problem in some specific cases. Firstly, the ground motion model of aircraft, the collision detection strategy and the constraints are included in the mathematical model. Then the principles of the chicken swarm optimization algorithm and the generality of the proposed method are explained. In the trajectory optimization algorithm, several strategies, i.e. generation of collocation points, transformation of control variable, and setting of segmented fitness function, are developed to meet the terminal constraints easier and make the search efficient. Three groups of experiments with different environments are conducted. Aircraft with different initial states can reach the targets with the minimum taxiing time, and the taxiing trajectories meet all the constraints. The reason why the general trajectory optimization method is validated in all kinds of situations is also explained. [ABSTRACT FROM AUTHOR]

Efficient and feasible flight deck operation scheduling plan is of great significance for improving the sortie rate of carrier aircraft. Oxygen filling, fueling, and other operations of each carrier aircraft are executed in the pre-flight preparation stage. Different personnel, support equipments, and supply resources, are required while different operations are being executed. To date, most approaches proposed in the literature are based on the unrealistic assumption that the transfer process of carrier aircraft can be ignored. To close this gap, the resource-constrained multi-aircraft scheduling problem on the flight deck is examined in this study. The main contributions of the study are as follows. First, by considering the transfer process of aircraft on the flight deck operations, the model formulation of resource-constrained multi-aircraft scheduling problem is established. Second, the parallel and serial scheduling framework are proposed, where parking spot priority rules and resource allocation rules are presented to select the most suitable resources. Third, a modified genetic programming algorithm is presented for obtaining efficient activity priority rules. Fourth, the well-performed scheduling framework, priority rules, and allocation rules are selected by conducting computational experiments. Furthermore, experiment results show that the parallel scheduling framework outperforms the serial framework in most experiments (average outperformance is 10.19%), and the parking spot priority rules slightly affect the serial scheduling framework. [ABSTRACT FROM AUTHOR]

Copyright of Transactions of Beijing Institute of Technology is the property of Beijing University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Featured Application: The dynamic scheduling research of carrier aircraft support operations in different missions involves multiple support resources (renewable resources include support operational crews and support equipment, non-renewable resources include oil, oxygen, nitrogen, hydraulic, power), complex scheduling process such as the operational activities that should satisfy serial and parallel constraint relationships, multiple constraints (renewable resources constraints, non-renewable resources constraints, operational space constraints). The efficient coordination of these resources can be described as a multi-resource constrained multi-project scheduling problem (MRCMPSP) under an uncertain environment. In this work, an integer programming mathematical model is established for carrier aircraft dynamic support scheduling to solve the non-deterministic polynomial-time hard (NP-hard) problem. A periodic and event-driven rolling horizon (RH) scheduling strategy that was inspired by the RH optimization method from predictive control technology is presented for the uncertain and dynamic environment. The RH strategy not only reduces the problem size, it also effectively adjusts the baseline scheduling in a reasonable computational time and avoids the unnecessary scheduling with effective resource allocation in the dynamic flight deck environment. The dual population genetic algorithm (DPGA) is designed to solve the large-scale scheduling problem. The computational results show that our approach can provide convenient guidance to carrier aircraft support and scheduling applications in the dynamic flight deck environment, and make better decisions regarding disruption on a real-time basis. The efficient scheduling of carrier aircraft support operations in the flight deck is important for battle performances. The supporting operations and maintenance processes involve multiple support resources, complex scheduling process, and multiple constraints; the efficient coordination of these processes can be considered a multi-resource constrained multi-project scheduling problem (MRCMPSP), which is a complex non-deterministic polynomial-time hard (NP-hard) problem. The renewable resources include the operational crews, resource stations, and operational spaces, and the non-renewable resources include oil, gas, weapons, and electric power. An integer programming mathematical model is established to solve this problem. A periodic and event-driven rolling horizon (RH) scheduling strategy inspired by the RH optimization method from predictive control technology is presented for the dynamic scheduling environment. The periodic horizon scheduling strategy can track the changes of the carrier aircraft supporting system, and the improved event-driven mechanism can avoid unnecessary scheduling with effective resource allocation under uncertain conditions. The dual population genetic algorithm (DPGA) is designed to solve the large-scale scheduling problem. The activity list encoding method is proposed, and a new adaptive crossover and mutation strategy is designed to improve the global exploration ability. The double schedule for leftward and rightward populations is integrated into the genetic process of alternating iterations to improve the convergence speed and decrease the computation amount. The computational results show that our approach is effective at solving the scheduling problem in the dynamic environment, as well as making better decisions regarding disruption on a real-time basis. [ABSTRACT FROM AUTHOR]

The efficient scheduling of carrier aircraft support operations in the flight deck is important for battle performances. The supporting operations and maintenance processes involve multiple support resources, complex scheduling process, and multiple constraints; the efficient coordination of these processes can be considered a multi-resource constrained multi-project scheduling problem (MRCMPSP), which is a complex non-deterministic polynomial-time hard (NP-hard) problem. The renewable resources include the operational crews, resource stations, and operational spaces, and the non-renewable resources include oil, gas, weapons, and electric power. An integer programming mathematical model is established to solve this problem. A periodic and event-driven rolling horizon (RH) scheduling strategy inspired by the RH optimization method from predictive control technology is presented for the dynamic scheduling environment. The periodic horizon scheduling strategy can track the changes of the carrier aircraft supporting system, and the improved event-driven mechanism can avoid unnecessary scheduling with effective resource allocation under uncertain conditions. The dual population genetic algorithm (DPGA) is designed to solve the large-scale scheduling problem. The activity list encoding method is proposed, and a new adaptive crossover and mutation strategy is designed to improve the global exploration ability. The double schedule for leftward and rightward populations is integrated into the genetic process of alternating iterations to improve the convergence speed and decrease the computation amount. The computational results show that our approach is effective at solving the scheduling problem in the dynamic environment, as well as making better decisions regarding disruption on a real-time basis.

Copyright of Telecommunication Engineering is the property of Telecommunication Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

An experiment was conducted in a high speed wind tunnel to investigate external/internal weapon separation characteristics. Passive and active control methods, namely leading edge saw and leading edge mass injection, are explored to improve internal weapon separation characteristics. Test Mach numbers are 0. 6, 0. 9 and 1. 5. Force balance was used to obtain aerodynamics of weapon modal. Test results indicate that internal weapon separation characteristics are more complicated than that of external weapon, and it exists potential hazard when internal weapon separating from carrier aircraft. Aerodynamic characteristics of internal weapon are dramatically affected by weapon bay length-to-depth ratio L /D, peak pitching moment increases markedly with the increase of L/D. Both of passive and active control methods carried out in this paper can improve separation characteristics of internal weapon effectively. [ABSTRACT FROM AUTHOR]

Launching efficiency is an important index to measure the fighting capacity of an aircraft carrier. The study on path planning for taxi of carrier aircraft is of great significance for enhancing the launching efficiency. Considering the launching efficiency and the safety in operation of carrier aircraft launching and taking into account the carrier aircraft maneuver performance, deck environment and feature of mission, we proposed a conceptual model which contains the key elements of path planning for taxi of carrier aircraft. Subsequently, the objective function for the path planning problem and its mathematical model containing various constraints were established. With the A* search algorithm, a dynamic weight heuristic function was designed. According to the characteristic of path planning model for taxi of carrier aircraft, a simple and effective detection method was introduced. Finally, a feasible path for taxi of carrier aircraft, which meets the constraints, was presented. Taking the Nimitz-class aircraft carrier as an example, the paths for taxi of carrier aircraft launching from elevators to catapults were planned. Simulation results demonstrated the rationality of the model and the effectiveness of the algorithm. [ABSTRACT FROM AUTHOR]

The multicriteria optimization problem on joint choice of a carrier aircraft and main design parameters of an air launcher decoy are considered. The estimation of the design parameter values for the aerial decoy is based on the statistical data processing with the use of the methods for constructing nonlinear regression. The result of solving this problem is a set of Pareto-optimal geometry characteristics of the carrier aircraft and aerial decoy. A person who is responsible for decision-making should choose the most reasonable variant from these characteristics. An example of solving the problem is presented. [ABSTRACT FROM AUTHOR]

The efficiency of spare part transportation restricts sortie generation rate of aircrafts. Part transportation is used to transport spare part from base to carrier. Transportation strategy depends on both demand and inventory. The transportation time and stochastic demand induce fluctuations of cost and inventory. Robustness of control strategy ensures continuous parts supply. The Takagi-Sugeno fuzzy robust system with strong robustness provides a foundation for the formulation of parts supply strategy. Thus, a Takagi-Sugeno fuzzy system of dynamic part transportation is established considering transportation time and stochastic demand. And a novel Takagi-Sugeno fuzzy robust control (NTSFRC) is designed, which keeps cost and inventory low. NTSFRC with cross rule groups is conducted according to production and transportation strategy, which reduces fluctuations induced by strategies switch. Moreover, robust stability is guaranteed and part is supplied in time under a low cost in comparation with robust H∞ control strategy with particle swarm optimization. Finally, simulation illustrates effectiveness and quickness of NTSFRC. Besides, the proposed method is compatible with other transportation systems with delay time and uncertainty. [ABSTRACT FROM AUTHOR]

The 21st Century Aviation System can reduce the cost of flying, while substantially increasing the safety and security of cargo and carrier aircraft with an onboard pilot/s and a remote copilot residing in a secure ground-based simulator. [ABSTRACT FROM PUBLISHER]