针对航空发动机高空环境模拟过渡态试验对高空舱进气环境压力模拟系统提出的强抗扰性、强鲁棒性等控制综合品质要求,设计了一种基于鲁棒模型预测控制(Robust Model Predictive Control,RMPC)的高空舱进气环境压力控制方法。RMPC采用滚...针对航空发动机高空环境模拟过渡态试验对高空舱进气环境压力模拟系统提出的强抗扰性、强鲁棒性等控制综合品质要求,设计了一种基于鲁棒模型预测控制(Robust Model Predictive Control,RMPC)的高空舱进气环境压力控制方法。RMPC采用滚动时域优化和扰动反馈补偿的方法,在预测控制框架内处理模型的不确定性。通过建立进气环境压力模拟系统设备特性模型,设计了基于RMPC的进气环境压力控制策略,搭建了仿真平台,与线性自抗扰控制(Linear Active Disturbance Rejection Control,LADRC)方法进行了对比分析。仿真结果表明,应用RMPC技术后,动态调节时间由7.68 s缩短至3.91 s,最大瞬时波动量由0.94%减小至0.25%,该技术能够大幅提高发动机高空环境模拟过渡态试验中进气环境压力模拟的动态响应速度、控制精度和抗扰能力。展开更多
We present an optimal control model of three stages of resources allocation for managing invasive species. Three types of temporal uncertainty are considered, involving the timing of discovery of an invasive pest, the...We present an optimal control model of three stages of resources allocation for managing invasive species. Three types of temporal uncertainty are considered, involving the timing of discovery of an invasive pest, the timing of an induced technology development after the establishment and dispersion of an invasive species, and the timing of farmer adoption of induced technology as the costs of controlling the invasive species increase. Using a bioeconomic optimal control model of managing invasive species, where models in previous studies are subset within our model, we show that when sub-structured models not including all three stages are used for managing invasive species, resource allocation for adopting preventive measures before the initial discovery of an invasive pest would be supra-optimalwhile resource allocation for adopting conventional control measures after establishment and dispersion would be sub-optimal.展开更多
介绍了利用Visual Fortran实现一套变电站防误系统仿真算法,在此基础上利用Microsoft基础类库(MFC)和面向对象技术实现一套快速仿真建模系统。防误系统算法的实现借鉴了IEC61850标准中间隔的概念,以间隔为基本单元,依照模块化建模的思想...介绍了利用Visual Fortran实现一套变电站防误系统仿真算法,在此基础上利用Microsoft基础类库(MFC)和面向对象技术实现一套快速仿真建模系统。防误系统算法的实现借鉴了IEC61850标准中间隔的概念,以间隔为基本单元,依照模块化建模的思想,将防误模型的功能分为刀闸闭锁逻辑和刀闸操作控制逻辑。程序实现上采用面向对象技术,基于Rational Rose 2001和MFC进行设计和开发。该系统及算法可应用于所有基于STAR-90内核的仿真机支撑系统。展开更多
文摘针对航空发动机高空环境模拟过渡态试验对高空舱进气环境压力模拟系统提出的强抗扰性、强鲁棒性等控制综合品质要求,设计了一种基于鲁棒模型预测控制(Robust Model Predictive Control,RMPC)的高空舱进气环境压力控制方法。RMPC采用滚动时域优化和扰动反馈补偿的方法,在预测控制框架内处理模型的不确定性。通过建立进气环境压力模拟系统设备特性模型,设计了基于RMPC的进气环境压力控制策略,搭建了仿真平台,与线性自抗扰控制(Linear Active Disturbance Rejection Control,LADRC)方法进行了对比分析。仿真结果表明,应用RMPC技术后,动态调节时间由7.68 s缩短至3.91 s,最大瞬时波动量由0.94%减小至0.25%,该技术能够大幅提高发动机高空环境模拟过渡态试验中进气环境压力模拟的动态响应速度、控制精度和抗扰能力。
文摘表情合成研究是虚拟现实技术领域一项富有建设性和创造性的课题。使用双线性模型(Bilinear Model)分离出人的身份因素和表情因素来进行表情合成。在计算双线性模型的转移(Translation)问题时需要重复进行矩阵的逆运算来得到人的身份和表情信息,而当观测数据具有相关性或存在噪声信息时,该过程可能会不稳定。针对双线性模型在表情合成中的稳定性问题,通过在双线性模型转移过程引入改进迭代最小二乘法(Modified Iterative Least Square,MALS),使得该过程的计算具有更强的稳定性。设计实验进行验证,实验结果证明了方法的有效性。
文摘We present an optimal control model of three stages of resources allocation for managing invasive species. Three types of temporal uncertainty are considered, involving the timing of discovery of an invasive pest, the timing of an induced technology development after the establishment and dispersion of an invasive species, and the timing of farmer adoption of induced technology as the costs of controlling the invasive species increase. Using a bioeconomic optimal control model of managing invasive species, where models in previous studies are subset within our model, we show that when sub-structured models not including all three stages are used for managing invasive species, resource allocation for adopting preventive measures before the initial discovery of an invasive pest would be supra-optimalwhile resource allocation for adopting conventional control measures after establishment and dispersion would be sub-optimal.
文摘介绍了利用Visual Fortran实现一套变电站防误系统仿真算法,在此基础上利用Microsoft基础类库(MFC)和面向对象技术实现一套快速仿真建模系统。防误系统算法的实现借鉴了IEC61850标准中间隔的概念,以间隔为基本单元,依照模块化建模的思想,将防误模型的功能分为刀闸闭锁逻辑和刀闸操作控制逻辑。程序实现上采用面向对象技术,基于Rational Rose 2001和MFC进行设计和开发。该系统及算法可应用于所有基于STAR-90内核的仿真机支撑系统。
