The non-minimum phase feature of tail-controlled missile airframes is analyzed. Three selection strategies for desired performance indexes are presented. An acceleration autopilot design methodology based on output fe...The non-minimum phase feature of tail-controlled missile airframes is analyzed. Three selection strategies for desired performance indexes are presented. An acceleration autopilot design methodology based on output feedback and optimization is proposed. Performance and robustness comparisons between the two-loop and classical three-loop topologies are made. Attempts to improve the classical three-loop topology are discussed. Despite the same open-loop structure, the classical three-loop autopilot shows distinct characteristics from a two-loop autopilot with PI compensator. Both the two-loop and three-loop topologies can stabilize a static unstable missile. However, the finite actuator resource is the crucial factor dominating autopilot function.展开更多
The structure characteristic of the three-loop autopilot is analyzed and the pole placement analytic algorithm is given. In order to ensure that the system will meet the stability requirement when taking the dynamic c...The structure characteristic of the three-loop autopilot is analyzed and the pole placement analytic algorithm is given. In order to ensure that the system will meet the stability requirement when taking the dynamic characteristics of all the hardware devices into account, the frequency of the open-loop crossover should be constrained. Based on the pole placement algorithm, a non-linear equation with the non-dominant pole as a variable and the open-loop crossover frequency as a con- straint is constructed. Solving the equation and getting the corresponding value of the non-dominant pole, the design of autopilot can be completed. Finally, through an example, it is shown that the method is convenient and practicable for the design of a three-loop autopilot.展开更多
Instead of normally tackling electric circuits by virtue oI the Klrctllaott＇s theorem wnose aim is to uerlvc voxt^gc, electric current, and electric impedence, our aim in this paper is to derive the characteristic fr...Instead of normally tackling electric circuits by virtue oI the Klrctllaott＇s theorem wnose aim is to uerlvc voxt^gc, electric current, and electric impedence, our aim in this paper is to derive the characteristic frequency of a three-loop mesoscopic LC circuit with three mutual inductances, e.g., for the radiating frequency of the three-loop LC oscillator, we adopt the invariant eigen-operator （lEO） method to realize our aim.展开更多
The open-loop crossover frequency is pointed as an important parameter for practical autopilot design. Since different gain designs may achieve the same open-loop crossover frequency, it should be neither considered a...The open-loop crossover frequency is pointed as an important parameter for practical autopilot design. Since different gain designs may achieve the same open-loop crossover frequency, it should be neither considered as a performance objective of the optimal autopilot design-schemes nor neglected. Besides, the main assignment of the autopilot is to drive the missile to track the acceleration commands, so the autopilot gain design should be evaluated directly according to the resultant tracking performance. For this purpose, an optimal design methodology of the three-loop missile autopilot is introduced based on constraint optimization technique, where the tracking performance is established analytically as the design objective and the open-loop crossover frequency is formed as inequality constraint function, both are manipulated in terms of stable characteristic parameters of the autopilot closed-loop. The proposed technique is implemented with the assistance of a numerical optimization algorithm which automatically adjusts the design parameters. Finally, numerical simulation results are provided to demonstrate the effectiveness and feasibility of the proposed approach compared with that in some references.展开更多
调配缓冲槽作为核燃料含铀含硝酸废液回收处理的重要设备,其液位控制稳定性直接影响整个含铀含硝酸废液处理系统的安全稳定运行。若缓冲槽液位控制稳定性差,可能会导致含放射性与有毒物质的核燃料废液溢流、上游工艺系统非计划停车等安...调配缓冲槽作为核燃料含铀含硝酸废液回收处理的重要设备,其液位控制稳定性直接影响整个含铀含硝酸废液处理系统的安全稳定运行。若缓冲槽液位控制稳定性差,可能会导致含放射性与有毒物质的核燃料废液溢流、上游工艺系统非计划停车等安全生产事故,不仅造成控制系统无法连续稳定运行,还会影响下游蒸发浓缩系统、膜过滤系统的运行状态及处理效率。针对含铀含硝酸废液处理系统中缓冲槽液位控制稳定性差的问题,本文提出一种基于模型辨识的多输入单输出液位控制系统方法。首先,利用现场调试数据,采用模型辨识方法建立多输入单输出缓冲槽液位控制系统数学模型。其次,在已建模型基础上改进相关控制方式,提出三回路串级控制方式,经仿真验证得到了一种自适应规则整定比例-积分-微分(Proportional-Integral-Derivative,PID)参数。最后,在工程实际中通过集散控制系统(Distributed Control System,DCS)组态和控制器自适应整定规则的写入,对所提的方法进行了验证。结果表明,该方法具备较强自适应能力,可有效提升系统的稳定性,缩短调节时间,成功解决调配缓冲槽液位控制效果不佳的问题,保证整个工艺生产平稳运行。展开更多
文摘The non-minimum phase feature of tail-controlled missile airframes is analyzed. Three selection strategies for desired performance indexes are presented. An acceleration autopilot design methodology based on output feedback and optimization is proposed. Performance and robustness comparisons between the two-loop and classical three-loop topologies are made. Attempts to improve the classical three-loop topology are discussed. Despite the same open-loop structure, the classical three-loop autopilot shows distinct characteristics from a two-loop autopilot with PI compensator. Both the two-loop and three-loop topologies can stabilize a static unstable missile. However, the finite actuator resource is the crucial factor dominating autopilot function.
文摘The structure characteristic of the three-loop autopilot is analyzed and the pole placement analytic algorithm is given. In order to ensure that the system will meet the stability requirement when taking the dynamic characteristics of all the hardware devices into account, the frequency of the open-loop crossover should be constrained. Based on the pole placement algorithm, a non-linear equation with the non-dominant pole as a variable and the open-loop crossover frequency as a con- straint is constructed. Solving the equation and getting the corresponding value of the non-dominant pole, the design of autopilot can be completed. Finally, through an example, it is shown that the method is convenient and practicable for the design of a three-loop autopilot.
基金Project supported by the National Natural Science Foundation of China(Grant No.11775208)
文摘Instead of normally tackling electric circuits by virtue oI the Klrctllaott＇s theorem wnose aim is to uerlvc voxt^gc, electric current, and electric impedence, our aim in this paper is to derive the characteristic frequency of a three-loop mesoscopic LC circuit with three mutual inductances, e.g., for the radiating frequency of the three-loop LC oscillator, we adopt the invariant eigen-operator （lEO） method to realize our aim.
文摘The open-loop crossover frequency is pointed as an important parameter for practical autopilot design. Since different gain designs may achieve the same open-loop crossover frequency, it should be neither considered as a performance objective of the optimal autopilot design-schemes nor neglected. Besides, the main assignment of the autopilot is to drive the missile to track the acceleration commands, so the autopilot gain design should be evaluated directly according to the resultant tracking performance. For this purpose, an optimal design methodology of the three-loop missile autopilot is introduced based on constraint optimization technique, where the tracking performance is established analytically as the design objective and the open-loop crossover frequency is formed as inequality constraint function, both are manipulated in terms of stable characteristic parameters of the autopilot closed-loop. The proposed technique is implemented with the assistance of a numerical optimization algorithm which automatically adjusts the design parameters. Finally, numerical simulation results are provided to demonstrate the effectiveness and feasibility of the proposed approach compared with that in some references.
文摘调配缓冲槽作为核燃料含铀含硝酸废液回收处理的重要设备,其液位控制稳定性直接影响整个含铀含硝酸废液处理系统的安全稳定运行。若缓冲槽液位控制稳定性差,可能会导致含放射性与有毒物质的核燃料废液溢流、上游工艺系统非计划停车等安全生产事故,不仅造成控制系统无法连续稳定运行,还会影响下游蒸发浓缩系统、膜过滤系统的运行状态及处理效率。针对含铀含硝酸废液处理系统中缓冲槽液位控制稳定性差的问题,本文提出一种基于模型辨识的多输入单输出液位控制系统方法。首先,利用现场调试数据,采用模型辨识方法建立多输入单输出缓冲槽液位控制系统数学模型。其次,在已建模型基础上改进相关控制方式,提出三回路串级控制方式,经仿真验证得到了一种自适应规则整定比例-积分-微分(Proportional-Integral-Derivative,PID)参数。最后,在工程实际中通过集散控制系统(Distributed Control System,DCS)组态和控制器自适应整定规则的写入,对所提的方法进行了验证。结果表明,该方法具备较强自适应能力,可有效提升系统的稳定性,缩短调节时间,成功解决调配缓冲槽液位控制效果不佳的问题,保证整个工艺生产平稳运行。
