Traditional centralized Proportional Integral(PI)controller design methods based on Equivalent Transfer Functions(ETFs)have poor decoupling effect in turboprop engines.In this paper,a centralized PI design method base...Traditional centralized Proportional Integral(PI)controller design methods based on Equivalent Transfer Functions(ETFs)have poor decoupling effect in turboprop engines.In this paper,a centralized PI design method based on dynamic imaginary matrix and equivalent transfer function is proposed.Firstly,a method for solving equivalent transfer functions based on the dynamic imaginary matrix is proposed,which adopts dynamic imaginary matrix to describe the dynamic characteristics of the system,and obtains the equivalent transfer function based on the dynamic imaginary matrix characteristics.Secondly,for the equivalent transfer function,a central-ized PI control gain is designed using the Taylor expansion method.Meanwhile,this paper further proves that the centralized PI design method proposed in this paper has integral stability.Consid-ering the impact of altitude and Mach number on turboprop engines,a linear feedforward control method based on the transfer function matrix is further proposed based on the centralized PI con-troller,and the stability of the entire comprehensive control method is proved.Finally,to ensure the safe and effective operation of the turboprop engine,a temperature and torque limiting protection controller is designed for the turboprop engine.Simulation results show that the centralized PI con-troller design method and linear feedforward control method proposed can effectively improve the control quality of turboprop engine control systems.展开更多
The China Spallation Neutron Source (CSNS) Rapid Cycling Synchrotron (RCS) is a high beam power proton accelerator.The task of RCS injection system is to inject the negative hydrogen ions coming from linac into RCS by...The China Spallation Neutron Source (CSNS) Rapid Cycling Synchrotron (RCS) is a high beam power proton accelerator.The task of RCS injection system is to inject the negative hydrogen ions coming from linac into RCS by stripping method.This power supply demands that its output pulse current falling edge be controlled by the program. The power supply uses the IGBT power amplifying method to generate the pulse current and makes it follow the setting waveform by the power supply's feedback control system.The tracking error is one of the important specifications of the power supply.To satisfy the tracking error less than 2%,the frequency of the IGBT topology requested is more than 400kHz.The IGBT topology is connected by the IGBT H bridges in series and parallel,and works in the phase shifted method to divide the current,the voltage and improve the equivalent frequency.High power,high frequency,fast speed response and optimal feedback control strategy are the key to the good performance of painting bumper magnets pulsed power supply.展开更多
基于等价传递函数(ETF)理论,提出含有多时滞的高维多变量非方系统多环PI(preportional-integral)控制器设计方法.首先,利用等价传递函数与被控过程传递函数的广义逆之间关系推导出ETF的求解通式.接着,基于已获得的ETF,利用IMC-PID(inter...基于等价传递函数(ETF)理论,提出含有多时滞的高维多变量非方系统多环PI(preportional-integral)控制器设计方法.首先,利用等价传递函数与被控过程传递函数的广义逆之间关系推导出ETF的求解通式.接着,基于已获得的ETF,利用IMC-PID(internal model control-proportional integral derivation)原理设计控制器,再利用Maclaurin级数展开获得多环PI控制器参数.所提ETF算法不仅具有更高的精度且适应于高维非方系统.最后通过仿真实例验证了所提算法的简单性和有效性.展开更多
基金support by the National Natural Science Foundation of China (No.52202474)China Postdoctoral Science Foundation (No.2023M731655)+3 种基金Major Projects of National Science and Technology,China (No.J2019-I-0020-0019)Advanced Aviation Power Innovation Workstation Project,China (No.HKCX2022-01-026-03)Basic Research Business Fees for Central Universities,China (No.NT2023004)Nanjing University of Aeronautics and Astronautics Forward-looking Layout Research Project,China (No.1002-ILA22037-1A22).
文摘Traditional centralized Proportional Integral(PI)controller design methods based on Equivalent Transfer Functions(ETFs)have poor decoupling effect in turboprop engines.In this paper,a centralized PI design method based on dynamic imaginary matrix and equivalent transfer function is proposed.Firstly,a method for solving equivalent transfer functions based on the dynamic imaginary matrix is proposed,which adopts dynamic imaginary matrix to describe the dynamic characteristics of the system,and obtains the equivalent transfer function based on the dynamic imaginary matrix characteristics.Secondly,for the equivalent transfer function,a central-ized PI control gain is designed using the Taylor expansion method.Meanwhile,this paper further proves that the centralized PI design method proposed in this paper has integral stability.Consid-ering the impact of altitude and Mach number on turboprop engines,a linear feedforward control method based on the transfer function matrix is further proposed based on the centralized PI con-troller,and the stability of the entire comprehensive control method is proved.Finally,to ensure the safe and effective operation of the turboprop engine,a temperature and torque limiting protection controller is designed for the turboprop engine.Simulation results show that the centralized PI con-troller design method and linear feedforward control method proposed can effectively improve the control quality of turboprop engine control systems.
文摘由于无法统一衡量多点离焦近视防控镜片的防控效果,提出了一种简单快捷的新型离焦有效性评价模型——等效离焦指数(EDI,Equivalent Defocus Index)。利用软件仿真模拟分析了多点离焦镜片影响视觉质量及离焦相关的参数,给出EDI的定义,并以此计算3款典型排布的等效离焦指数,与调制传递函数(MTF,Modulation Transfer Function)的值进行比较,验证了该模型的有效性。
文摘The China Spallation Neutron Source (CSNS) Rapid Cycling Synchrotron (RCS) is a high beam power proton accelerator.The task of RCS injection system is to inject the negative hydrogen ions coming from linac into RCS by stripping method.This power supply demands that its output pulse current falling edge be controlled by the program. The power supply uses the IGBT power amplifying method to generate the pulse current and makes it follow the setting waveform by the power supply's feedback control system.The tracking error is one of the important specifications of the power supply.To satisfy the tracking error less than 2%,the frequency of the IGBT topology requested is more than 400kHz.The IGBT topology is connected by the IGBT H bridges in series and parallel,and works in the phase shifted method to divide the current,the voltage and improve the equivalent frequency.High power,high frequency,fast speed response and optimal feedback control strategy are the key to the good performance of painting bumper magnets pulsed power supply.
文摘基于等价传递函数(ETF)理论,提出含有多时滞的高维多变量非方系统多环PI(preportional-integral)控制器设计方法.首先,利用等价传递函数与被控过程传递函数的广义逆之间关系推导出ETF的求解通式.接着,基于已获得的ETF,利用IMC-PID(internal model control-proportional integral derivation)原理设计控制器,再利用Maclaurin级数展开获得多环PI控制器参数.所提ETF算法不仅具有更高的精度且适应于高维非方系统.最后通过仿真实例验证了所提算法的简单性和有效性.
