Since the dynamical system and control system of the missile are typically nonlinear, an effective acceleration tracking autopilot is designed using the dynamic surface control(DSC)technique in order to make the missi...Since the dynamical system and control system of the missile are typically nonlinear, an effective acceleration tracking autopilot is designed using the dynamic surface control(DSC)technique in order to make the missile control system more robust despite the uncertainty of the dynamical parameters and the presence of disturbances. Firstly, the nonlinear mathematical model of the tail-controlled missile is decomposed into slow acceleration dynamics and fast pitch rate dynamics based on the naturally existing time scale separation. Secondly, the controller based on DSC is designed after obtaining the linear dynamics characteristics of the slow and fast subsystems. An extended state observer is used to detect the uncertainty of the system state variables and aerodynamic parameters to achieve the compensation of the control law. The closed-loop stability of the controller is derived and rigorously analyzed. Finally, the effectiveness and robustness of the design is verified by Monte Carlo simulation considering different initial conditions and parameter uptake. Simulation results illustrate that the missile autopilot based DSC controller achieves better performance and robustness than the other two well-known autopilots.The method proposed in this paper is applied to the design of a missile autopilot, and the results show that the acceleration tracking autopilot based on the DSC controller can ensure accurate tracking of the required commands and has better performance.展开更多
针对一类具有不确定系统函数和方向未知的不确定增益函数的非线性系统,提出了一种鲁棒自适应神经网络控制算法.本算法采用RBF神经网络(Radial based function neural network,RBFNN)逼近模型不确定性,外界干扰和建模误差采用非线性阻尼...针对一类具有不确定系统函数和方向未知的不确定增益函数的非线性系统,提出了一种鲁棒自适应神经网络控制算法.本算法采用RBF神经网络(Radial based function neural network,RBFNN)逼近模型不确定性,外界干扰和建模误差采用非线性阻尼项进行补偿,将动态面控制(Dynamic surface control,DSC)与后推方法结合,消除了反推法的计算膨胀问题,降低了控制器的复杂性;尤其是采用Nussbaum函数处理系统中方向未知的不确定虚拟控制增益函数,不仅可以避免可能存在的控制器奇异值问题,而且还能使得整个系统的在线学习参数显著减少,与DSC方法优点结合,使得控制算法的计算量大为减少,便于计算机实现.稳定性分析证明了所得闭环系统是半全局一致最终有界(Semi-global uniformly ultimately bounded,SGUUB)的,并且跟踪误差可以收敛到原点的一个较小邻域.最后,计算机仿真结果表明了本文所提出控制器的有效性.展开更多
OPC(OLE for process control)作为一种工业标准,提供了硬件设备的统一“驱动”,极大的简化了软件与硬件之间的通讯编程。NI最新推出的LabVIEW8.0的DSC(dataloggingand supervisory control)模块进一步加强与简化了与OPCServer的通讯,...OPC(OLE for process control)作为一种工业标准,提供了硬件设备的统一“驱动”,极大的简化了软件与硬件之间的通讯编程。NI最新推出的LabVIEW8.0的DSC(dataloggingand supervisory control)模块进一步加强与简化了与OPCServer的通讯,而且其自身也可以作为一个OPC Server存在。介绍了如何通过LabVIEW 8.0 DSC模块与OPC Server进行通讯以及如何用它编写自己的OPC Server。展开更多
针对测控系统中常用的OPC、Modbus及第三方自定义协议通信,介绍了基于LabVIEW以上通信协议的实现方法,提出并实现了把原本分散的各种通信方式集成到NI LabVIEW的DSC(Datalogging and Supervisory Control Module)平台,统一运行于后台的...针对测控系统中常用的OPC、Modbus及第三方自定义协议通信,介绍了基于LabVIEW以上通信协议的实现方法,提出并实现了把原本分散的各种通信方式集成到NI LabVIEW的DSC(Datalogging and Supervisory Control Module)平台,统一运行于后台的方案。实践表明,此方案不但简化测控系统软件的架构,而且提高了系统通信的效率和稳定性。展开更多
城市隧道下穿时,普遍存在着地表房屋变形超限、倾斜开裂等安全风险问题,而且当前针对房屋变形开裂的计算分析、风险评估研究,也严重滞后于实际工程的需要。通过综合分析、比选,以及单、三轴试验验证表明:DSC(disturbed state concept)...城市隧道下穿时,普遍存在着地表房屋变形超限、倾斜开裂等安全风险问题,而且当前针对房屋变形开裂的计算分析、风险评估研究,也严重滞后于实际工程的需要。通过综合分析、比选,以及单、三轴试验验证表明:DSC(disturbed state concept)本构模型能够较好地描述材料开裂后力学行为;采用该模型并结合厦门机场路隧道下穿建筑群的工程实践,对地表建筑群开裂进行定量评估,评估结果与现场房屋裂缝监测、变形监测结果一致性良好。同时,对照扰动变量与实际房屋开裂的对应关系,发现扰动变量可以作为房屋开裂的定量安全指标,进一步即可以建立房屋变形开裂的过程控制标准,从而使隧道下穿过程中每个关键施工部、每个时段,地表房屋变形开裂程度、开裂风险都可以进行量化评估。展开更多
首先进行了压电陀螺漂移特性分析,重点研究了利用数字信号控制器(DSC,digital signal controller)和LabWindows/CVI软件设计出压电陀螺漂移测试实验,测量出压电陀螺实际的漂移误差数据,由此建立了压电陀螺漂移特性ARMA模型,设计出基于LM...首先进行了压电陀螺漂移特性分析,重点研究了利用数字信号控制器(DSC,digital signal controller)和LabWindows/CVI软件设计出压电陀螺漂移测试实验,测量出压电陀螺实际的漂移误差数据,由此建立了压电陀螺漂移特性ARMA模型,设计出基于LMI的鲁棒滤波器,并与Kalman滤波器进行了仿真比较,提高了陀螺随机漂移的估计精度,保证了陀螺误差补偿的有效性。展开更多
基金supported by Joint Fund of the Ministry of Education f or Equipment Pre-research (6141A20223)。
文摘Since the dynamical system and control system of the missile are typically nonlinear, an effective acceleration tracking autopilot is designed using the dynamic surface control(DSC)technique in order to make the missile control system more robust despite the uncertainty of the dynamical parameters and the presence of disturbances. Firstly, the nonlinear mathematical model of the tail-controlled missile is decomposed into slow acceleration dynamics and fast pitch rate dynamics based on the naturally existing time scale separation. Secondly, the controller based on DSC is designed after obtaining the linear dynamics characteristics of the slow and fast subsystems. An extended state observer is used to detect the uncertainty of the system state variables and aerodynamic parameters to achieve the compensation of the control law. The closed-loop stability of the controller is derived and rigorously analyzed. Finally, the effectiveness and robustness of the design is verified by Monte Carlo simulation considering different initial conditions and parameter uptake. Simulation results illustrate that the missile autopilot based DSC controller achieves better performance and robustness than the other two well-known autopilots.The method proposed in this paper is applied to the design of a missile autopilot, and the results show that the acceleration tracking autopilot based on the DSC controller can ensure accurate tracking of the required commands and has better performance.
文摘针对一类具有不确定系统函数和方向未知的不确定增益函数的非线性系统,提出了一种鲁棒自适应神经网络控制算法.本算法采用RBF神经网络(Radial based function neural network,RBFNN)逼近模型不确定性,外界干扰和建模误差采用非线性阻尼项进行补偿,将动态面控制(Dynamic surface control,DSC)与后推方法结合,消除了反推法的计算膨胀问题,降低了控制器的复杂性;尤其是采用Nussbaum函数处理系统中方向未知的不确定虚拟控制增益函数,不仅可以避免可能存在的控制器奇异值问题,而且还能使得整个系统的在线学习参数显著减少,与DSC方法优点结合,使得控制算法的计算量大为减少,便于计算机实现.稳定性分析证明了所得闭环系统是半全局一致最终有界(Semi-global uniformly ultimately bounded,SGUUB)的,并且跟踪误差可以收敛到原点的一个较小邻域.最后,计算机仿真结果表明了本文所提出控制器的有效性.
文摘针对测控系统中常用的OPC、Modbus及第三方自定义协议通信,介绍了基于LabVIEW以上通信协议的实现方法,提出并实现了把原本分散的各种通信方式集成到NI LabVIEW的DSC(Datalogging and Supervisory Control Module)平台,统一运行于后台的方案。实践表明,此方案不但简化测控系统软件的架构,而且提高了系统通信的效率和稳定性。
文摘城市隧道下穿时,普遍存在着地表房屋变形超限、倾斜开裂等安全风险问题,而且当前针对房屋变形开裂的计算分析、风险评估研究,也严重滞后于实际工程的需要。通过综合分析、比选,以及单、三轴试验验证表明:DSC(disturbed state concept)本构模型能够较好地描述材料开裂后力学行为;采用该模型并结合厦门机场路隧道下穿建筑群的工程实践,对地表建筑群开裂进行定量评估,评估结果与现场房屋裂缝监测、变形监测结果一致性良好。同时,对照扰动变量与实际房屋开裂的对应关系,发现扰动变量可以作为房屋开裂的定量安全指标,进一步即可以建立房屋变形开裂的过程控制标准,从而使隧道下穿过程中每个关键施工部、每个时段,地表房屋变形开裂程度、开裂风险都可以进行量化评估。
文摘首先进行了压电陀螺漂移特性分析,重点研究了利用数字信号控制器(DSC,digital signal controller)和LabWindows/CVI软件设计出压电陀螺漂移测试实验,测量出压电陀螺实际的漂移误差数据,由此建立了压电陀螺漂移特性ARMA模型,设计出基于LMI的鲁棒滤波器,并与Kalman滤波器进行了仿真比较,提高了陀螺随机漂移的估计精度,保证了陀螺误差补偿的有效性。
