针对二次泵变流量空调冷冻水系统采取的回水温度PID控制方式,往往导致稳态误差与超调量均较大和调节时间较长等问题。鉴于此,提出了回水温度PI^(λ)D^(μ)-供水流量PI^(λ)串级控制策略和改进的粒子群算法实施串级控制器参数整定的设计...针对二次泵变流量空调冷冻水系统采取的回水温度PID控制方式,往往导致稳态误差与超调量均较大和调节时间较长等问题。鉴于此,提出了回水温度PI^(λ)D^(μ)-供水流量PI^(λ)串级控制策略和改进的粒子群算法实施串级控制器参数整定的设计方案。根据二次泵变流量空调冷冻水系统的工艺要求和相关自动控制理论,对该回水温度PI^(λ)D^(μ)-供水流量PI^(λ)串级系统的各个组成环节,如主、副被控对象及回水温度PI^(λ)D^(μ)控制器(Fractional Order PID Controller for Backwater Temperature,BT-FOPIDC)和供水流量PI^(λ)控制器(Fractional Order PI Controller for the Flow of Water Supply,FWS-FOPIC)等进行建模。引入正切三角函数对基本粒子群算法中的惯性权重进行非线性递减的改变,构建改进的粒子群算法(Modified Particle Swarm Algorithm,MPSA),对这两个串级控制器的参数进行整定,获取8个参数最佳值。借助MATLAB软件,对该回水温度PI^(λ)D^(μ)-供水流量PI^(λ)串级系统进行组态和仿真运行。结果表明,该分数阶串级控制系统及其基于MPSA的控制器参数整定在理论上是可行的,且控制效果优于传统的回水温度PID单回路控制系统。展开更多
In this paper, the Adomian＇s decomposition method （ADM） is presented for finding the exact solutions of a more general biological population models. A new solution is constructed in power series. The fractional der...In this paper, the Adomian＇s decomposition method （ADM） is presented for finding the exact solutions of a more general biological population models. A new solution is constructed in power series. The fractional derivatives are described in the Caputo sense. To illustrate the reliability of the method, some examples are provided.展开更多
In this letter, the communication transmitter transient signals are analyzed based on the time-variant hierarchy exponents of multifractal analysis. The species of optimized sample set is selected as the template of t...In this letter, the communication transmitter transient signals are analyzed based on the time-variant hierarchy exponents of multifractal analysis. The species of optimized sample set is selected as the template of transmitter identification, so that the individual communication transmitter identification can be realized. The turn-on signals of four transmitters are used in the simulation. The experimental results show that the multifractal character of transmitter transient signals is an effective character of individual transmitter identification.展开更多
文摘针对二次泵变流量空调冷冻水系统采取的回水温度PID控制方式,往往导致稳态误差与超调量均较大和调节时间较长等问题。鉴于此,提出了回水温度PI^(λ)D^(μ)-供水流量PI^(λ)串级控制策略和改进的粒子群算法实施串级控制器参数整定的设计方案。根据二次泵变流量空调冷冻水系统的工艺要求和相关自动控制理论,对该回水温度PI^(λ)D^(μ)-供水流量PI^(λ)串级系统的各个组成环节,如主、副被控对象及回水温度PI^(λ)D^(μ)控制器(Fractional Order PID Controller for Backwater Temperature,BT-FOPIDC)和供水流量PI^(λ)控制器(Fractional Order PI Controller for the Flow of Water Supply,FWS-FOPIC)等进行建模。引入正切三角函数对基本粒子群算法中的惯性权重进行非线性递减的改变,构建改进的粒子群算法(Modified Particle Swarm Algorithm,MPSA),对这两个串级控制器的参数进行整定,获取8个参数最佳值。借助MATLAB软件,对该回水温度PI^(λ)D^(μ)-供水流量PI^(λ)串级系统进行组态和仿真运行。结果表明,该分数阶串级控制系统及其基于MPSA的控制器参数整定在理论上是可行的,且控制效果优于传统的回水温度PID单回路控制系统。
文摘In this paper, the Adomian＇s decomposition method （ADM） is presented for finding the exact solutions of a more general biological population models. A new solution is constructed in power series. The fractional derivatives are described in the Caputo sense. To illustrate the reliability of the method, some examples are provided.
文摘In this letter, the communication transmitter transient signals are analyzed based on the time-variant hierarchy exponents of multifractal analysis. The species of optimized sample set is selected as the template of transmitter identification, so that the individual communication transmitter identification can be realized. The turn-on signals of four transmitters are used in the simulation. The experimental results show that the multifractal character of transmitter transient signals is an effective character of individual transmitter identification.
