A new identification method for a linear discrete-time closed-loop system is proposed based on an output over-sampling scheme. When the system outputs are over-sampled the new output sequences would contain more infor...A new identification method for a linear discrete-time closed-loop system is proposed based on an output over-sampling scheme. When the system outputs are over-sampled the new output sequences would contain more information about the plant structure. Using general least squares method （GLS） the plant over-sampled model should be recognized. Then the original plant model should be obtained by its relationship with the over-sampled model. Compared with conventional approaches the advantage of the new method is that even if the ordinary identifiability conditions are not satisfied, a close-loop system can be identified by using the oversampled output without utilizing any external test signal. Accuracy analysis shows the relationship between the estimation error and the over-sampling rate. Numerical simulation illnstrates its effectiveness.展开更多
为了降低磕头式抽油机的能量损耗,设计了一种节能型液压抽油机。根据设计的液压原理图,在AMESim仿真软件中完成液压系统仿真建模,在分析位置闭环控制系统时,最终采用位置闭环反馈结合前馈补偿的复合校正控制方案,具有最优控制效果;单一...为了降低磕头式抽油机的能量损耗,设计了一种节能型液压抽油机。根据设计的液压原理图,在AMESim仿真软件中完成液压系统仿真建模,在分析位置闭环控制系统时,最终采用位置闭环反馈结合前馈补偿的复合校正控制方案,具有最优控制效果;单一油缸在行程止点的位置误差为±1 mm,理论消耗能量达到7 k W,整体响应时间缩短,满足设备指标要求,对于工作过程中的位置偏差具有一定的抗干扰能力。展开更多
基金Project supported by National Natural Science Foundation ofChina (Grant No .60174030)
文摘A new identification method for a linear discrete-time closed-loop system is proposed based on an output over-sampling scheme. When the system outputs are over-sampled the new output sequences would contain more information about the plant structure. Using general least squares method （GLS） the plant over-sampled model should be recognized. Then the original plant model should be obtained by its relationship with the over-sampled model. Compared with conventional approaches the advantage of the new method is that even if the ordinary identifiability conditions are not satisfied, a close-loop system can be identified by using the oversampled output without utilizing any external test signal. Accuracy analysis shows the relationship between the estimation error and the over-sampling rate. Numerical simulation illnstrates its effectiveness.
文摘为了降低磕头式抽油机的能量损耗,设计了一种节能型液压抽油机。根据设计的液压原理图,在AMESim仿真软件中完成液压系统仿真建模,在分析位置闭环控制系统时,最终采用位置闭环反馈结合前馈补偿的复合校正控制方案,具有最优控制效果;单一油缸在行程止点的位置误差为±1 mm,理论消耗能量达到7 k W,整体响应时间缩短,满足设备指标要求,对于工作过程中的位置偏差具有一定的抗干扰能力。
