一种船舶直线航迹控制算法及控制参数的设计

在船舶运动参数准确值未知的条件下,针对如何设计航迹控制参数,保证船舶航迹控制全局渐近稳定的问题,给出了船舶航迹控制参数的分析、设计和实验验证方法。首先,提出一种不直接包含船舶运动参数的船舶航迹状态反馈控制律。接着,通过稳定性分析获得了实现船舶航迹闭环系统全局渐近稳定的条件。然后,由该稳定条件给出了船舶航迹控制参数的分析、设计和实验方法。最后,对该方法进行了数字仿真,并应用到船舶航迹自动操舵仪装备中。实船应用结果证明了方法的可行性和有效性。     

船舶推进轴系扭振数据采集及处理系统

从验证扭振信号采集和故障监测的准确性和可靠性的目的出发,设计了一套船舶推进轴系扭振数据采集及处理系统.同时,以齿盘和光电开关组合为传感器,NI的信号调理箱、数据采集卡等为主要器件实现了扭振信号采集;并采用Visual C 编程开发了故障监测与分析软件,实现了对扭振信号的实时采集和处理.实验研究结果表明,该方案实现了设计的目标,较好地满足了教学和科研的需求.     

舰船液压系统的噪声及其控制

该文主要从机械噪声、流体噪声、共振噪声等方面分析了舰船液压系统产生噪声的原因,为了降低噪声,减弱噪声对舰船人员的污染,文中提出了降低液压系统噪声的相应措施.     

An improved genetic algorithm for robust permutation flowshop scheduling

In order to deal with uncertainties, a robust schedule for M-machine permutation flowshop is proposed. The presented robust schedule is aimed to maximize the probability of ensuring that makespan will not exceed the expected completion time. An improved genetic algorithm (GA) with a new generation scheme is developed, which can preserve good characteristics of parents in the new generation. Experiments are performed to get robust schedules for well-known Car and Rec permutation flowshop problems, taken from OR library. The schedules obtained from the improved GA are compared with the schedules formed by well-known heuristic in literature. Computational results show that the permutation flowshop schedules obtained from improved GA are robust to produce an affirmative percentage increase in the probability of getting makespan less than expected completion time.     

一种改进的时滞不确定性系统鲁棒容错控制算法

研究了一类具有时滞不确定性系统的鲁棒容错控制问题,针对既有传感器失效,又有执行器失效的故障情形,通过引入一种无记忆的状态反馈控制器,基于Lyapunov稳定定理和运用线性矩阵不等式(LMI)的方法,给出了在传感器失效和执行器失效故障下具有鲁棒完整性的充分条件,并进行了证明。最后利用Matlab中的LMI工具箱进行了算例仿真,证实了这种设计方法的有效性和可行性,减少了当出现故障时需要先判断哪类故障的任务,为容错控制提供了便利。     

鲁棒PID调节系统的参数选择

本文根据控制系统鲁棒性与最优控制要求得出一种理想开环系统的频率特性,它同一种特定的ＰＩＤ模型特性非常吻合,这种ＰＩＤ特性不仅受ＰＩＤ模型结构所影响,而且还与对象参数及ＰＩＤ参数的相对位置有关。本文详细说明这种鲁棒ＰＩＤ原理。     

船舶电力综合控制系统研究与开发

针对船舶电力系统监测能力弱、可靠性差、自动化程度低等问题,将传感器、可编程逻辑控制器、并车与保护单元、电力综合显控台应用到船舶电力综合控制系统中。对该系统的需求进行分析,建立自上而下管理层、控制层和数据层3个层次之间的关系,提出了船舶电力综合控制方法。在联调试验和船舶上对该综合控制系统进行了实际应用。研究结果表明,该综合控制系统可显著提高船舶电力系统的监测能力、可靠性、自动化化水平,保证了船舶电力系统的安全性、可靠性、优质性和经济性。     

A study on the robust control algorithm for an axially moving film

This paper presents the non-linear modeling of the web(film) transfer system and design of (robust) sliding mode controller bared on the developed model. The system model shows change in the roll-radius during winding and unwinding of the web. The change of inertia makes the web transfer system time-varying and nonlinear. In designing a robust controller, two major objectives are considered. The first one is that the web transferring velocity tracks a given reference velocity; the second one is that the web tension is regulated at a certain value. To verify the control algorithm, the proposed algorithm is compared with a conventional PID controller through a campater simulation based on simulink model. Computer simulation study shows that the proposed robust sliding mode controller is an improvement over the PID controller for various control inputs.     

A novel predictive control algorithm and robust stability criteria for integrating processes

This paper introduces a novel predictive controller for single-input/single-output (SISO) integrating systems, which can be directly applied without pre-stabilizing the process. The control algorithm is designed on the basis of the tested step response model. To produce a bounded system response along the finite predictive horizon, the effect of the integrating mode must be zeroed while unmeasured disturbances exist. Here, a novel predictive feedback error compensation method is proposed to eliminate the permanent offset between the setpoint and the process output while the integrating system is affected by load disturbance. Also, a rotator factor is introduced in the performance index, which is contributed to the improvement robustness of the closed-loop system. Then on the basis of Jury’s dominant coefficient criterion, a robust stability condition of the resulted closed loop system is given. There are only two parameters which need to be tuned for the controller, and each has a clear physical meaning, which is convenient for implementation of the control algorithm. Lastly, simulations are given to illustrate that the proposed algorithm can provide excellent closed loop performance compared with some reported methods.     

A study on the control system design for ship mooring winch system

This paper considers the control system design problem of a barge type surface vessel. The main role of a barge ship is to carry and supply cargo and materials to floating units and other marine locations. To carry out this job, the barge ship has to be positioned in a specified area. Although thrust systems are installed on the ship, in general, the mooring winch system with cable is used. Therefore, this paper proposes a single type mooring winch system and a method of designing a control system. We propose a mathematical model of the vessel winch control system, and the reliability of the control system is verified by numerical calculations and experiments. In addition, a cable model is constructed from the experimental data to identify the characteristic of cable motion, which is unknown in general and considered as an uncertainty. Based on these results, a robust control system is designed, and its control performance evaluated by simulation and experiment show that the proposed approach works well.     

智能控制算法在温控系统中的应用

文章首先介绍了温控系统的方案设计,接着介绍BP神经网络结构。指出了基本BP算法的弊端并提出相应的优化方法。利用matlab工具箱作为平台建立控制模型,通过遗传算法获得大致的全局最优点,再由改进的BP学习算法对其精心调整,得出最佳控制模型,并通过测试样本仿真和试验。本设计的应用为实现快速、精确的温控系统提供了一种功耗低、经济有效的解决方案。     

船舶损管监控系统的研究与开发

针对影响船舶安全的各种损害隐患问题,对船舶损管监控系统的必要性、功能、组成、原理、架构、硬件和软件等方面进行了研究,对基于损管监控台、现场控制设备及数据处理设备、各类传感器及执行机构的管理层、控制层、数据层三层控制模型进行了归纳,提出了基于传感器、可编程逻辑控制器和损管监控台的船舶损管监控系统,利用半实物仿真试验、陆上联调试验和实船应用对该监控系统的性能、功能、环境适应性和电磁兼容进行了测试。研究结果表明,该系统可实时监控各种损害隐患状态,提高了船舶损害隐患的管控水平,保证了船舶的安全性、可靠性。     

基于BP神经网络的火电厂水质调节系统的Smith-PID自适应控制

针对火电厂水质调节系统大时滞时变性的特点,提出了基于BP神经网络的Smith-PID控制算法,仿真研究和实际应用表明,该控制算法具有良好的静态特性、动态品质和很强的鲁棒性;工程应用控制效果令人满意。     

基于PLC的一种离线鲁棒模型预测控制算法实现

在介绍了一种新型多面体不变集鲁棒预测控制器设计算法后,本文重点阐述了算法在PLC中的实现方法及其应用研究.论文采用PLC来实现上述的控制算法,在工程应用中具有更高的稳定性和实用性.仿真结果表明,该算法的应用效果完全满足实际工程要求.本文中提到的应用方法可直接或稍加修改应用于实际工业过程.     

An adaptive algorithm applied to a design of robust observer

Primary goal of adaptive observers would be to estimate the true states of a plant. Identification of unknown parameters is of secondary interest and is achieved frequently with the persistent excitation condition of some regressors. Nevertheless, two problems are linked to each other in the classical approaches to adaptive observers; as a result, we get a good state estimate once after a good parameter estimate is obtained. This paper focuses on the state estimation without parameter identification so that the state is estimated regardless of persistent excitation. In this direction of research, Besancon (2000) recently summarized that most of adaptive observers in the literature share one common canonical form, in which unknown parameters do not affect the unmeasured states. We enlarge the class of linear systems from the canonical form of (Besancon. 2000) by proposing an adaptive observer (with additional dynamics) that allows unknown parameters to affect those unmeasured states. A recursive algorithm is presented to design the proposed dynamic observer systematically. An example confirms the design procedure with a simulation result.     

Sensorless control of ship propulsion interior permanent magnet synchronous motor based on a new sliding mode observer

This paper proposes a sensorless speed control strategy for ship propulsion interior permanent magnet synchronous motor (IPMSM) based on a new sliding-mode observer (SMO). In the SMO the low-pass filter and the method of arc-tangent calculation of extended electromotive force (EMF) or phase-locked loop (PLL) technique are not used. The calculation of the rotor speed is deduced from the Lyapunov function stability analysis. In order to reduce system chattering, sigmoid functions with switching gains being adaptively updated by fuzzy logic systems are innovatively incorporated into the SMO. Finally, simulation results for a 4.088 MW ship propulsion IPMSM and experimental results from a 7.5 kW IPMSM drive are provided to verify the effectiveness of the proposed SMO method.     

船舶阀门遥控系统的选用与分析

分析了电动、气动以及液压驱动方式的船舶阀门遥控系统的性能。比较了各种驱动方式的性能与特点。介绍了广泛应用的液压驱动阀门遥控系统的组成。提出了根据舰船实际需要选择阀控系统的具体建议。     

基于模糊PID的浮选机液位控制系统研究

以浮选液位控制系统的液位控制为研究对象,结合浮选液位控制系统的特点及其性能要求,提出了一种将模糊控制、自适应控制结合起来的自适应模糊PID控制算法,在该算法中计算机根据控制系统的实际响应误差及其变化情况,基于设计的模糊规则,进行模糊推理等工作实现了PID算法的参数在线整定工作。在MATLAB环境下对浮选液位控制系统的液位控制进行了动态仿真;仿真结果表明,该模糊PID控制器算法的控制性能远优于传统PID控制器,能够满足浮选过程对其液位的要求。     

一种改进的三电平逆变器SVPWM控制算法

传统三电平空间矢量脉宽调制(SVPWM)算法中扇区分割多为三角形和六边形,扇区判断计算复杂,且采用七段式开关序列,开关频率较大.为此,提出了一种新的三电平逆变器SVPWM控制算法,利用新的空间矢量类六边形进行扇区分割减少扇区判断的复杂性,采用新的四段式开关序列降低开关频率.仿真结果表明,在开关频率降低的情况下总谐波失真(THD)降低,且该算法的系统运行计算时间较短.     

船用锻件的质量控制

根据各船级社规范中对产品质量的有关要求，结合生产实践经验，对船用锻件的质量控制进行了探讨。