A unified approach of PID controller design for unstable processes with time delay

This paper addresses a unified approach of the PID controller design for low as well as high order unstable processes with time delay.The design method is based on the direct synthesis(DS)approach to achieve the enhanced load disturbance rejection.To improve the servo response,a two-degree of freedom control scheme has been considered.A suitable guideline has been provided to select the desired reference model in the DS scheme.The direct synthesis controller has been approximated to the PID controller using the frequency response matching method.A consistently better performance has been obtained in comparison with the recently reported methods.

On the Relationship between the Pure Delay and the Natural Period of Oscillation

This paper provides a proof of the well-known relationship between the pure delay and the natural period of oscillation in industrial systems.

Adaptive broadband beamformer for nonuniform linear array based on second order cone programming

Adaptive broadband beamforraing is a key issue in array applications. The adaptive broadband beamformer with tapped delay line （TDL） structure for nonuniform linear array （NLA） is designed according to the rule of minimizing the beamformer＇s output power while keeping the distortionless response （DR） in the direction of desired signal and keeping the constant beamwidth （CB） with the prescribed sidelobe level over the whole operating band. This kind of beamforming problem can be solved with the interior-point method after being converted to the form of standard second order cone programming （SOCP）. The computer simulations are presented which illustrate the effectiveness of our beamformer.

先进控制技术及应用 第五讲 预测函数控制(PFC)——一种新型预测控制策略

系统地阐述了预测函数控制的基本原理，并针对一阶过程和一阶加纯滞后过程给出了相应的控制算法。仿真和工业应用结果表明：预测函数控制具有良好的抗干扰能力和跟踪效果。