The transition process and dynamic

The transition process and dynamic performance of parameter control in density control are analyzed based on the actual operation curve, such asFigure 3-7. The response process of the control system from the beginning of detecting the input signal until the system output value reaches stability is called the transition process, also called the dynamic process. In the dynamic process, because of the inertia of the system and other reasons, the output can not completely follow the change of the input. According to the structure of the system, the influence of interference factors and the selection of parameters, the transition process is represented by divergence, attenuation or equal amplitude oscillation. In addition to providing information about the stability of the system, the transition process can also provide information about the degree of the output deviating from the input in each instant and the relevant time interval, which reflects the dynamic performance of the system. The indexes of dynamic performance include delay time, rise time, peak time, adjustment time, overshoot, oscillation times, etc. These performance indexes can basically reflect the characteristics of control system transition process. Among them, rise time, peak time and regulation time are the indicators of the speed of the transition process; overshoot and oscillation times are the indicators of the intensity of the transition process. In practical application, the most commonly used dynamic performance indicators are rise time, adjustment time and overshoot.