pid控制系统外文翻译

pid控制系统外文翻译内容摘要：

rther reduced, until zero. Therefore, the ratio of plus integral (PI) controller, the system can be no stability in the state into steadystate error Differential (D) control Differential control, the controller output and input error differential signal (that is, the rate of change of error) in proportion. Automatic control system to overe the error in the adjustment process may occur even oscillatory instability. The reason is because there is a greater inertial measurement unit (link) or backward (delay) ponents. inhibit the role of error, the changes are always behind the changes in error. The solution is to change the role of inhibition error get ahead in error close to zero. inhibit the role of error should be zero. This means that the introduction of the 无锡职业技术学院 毕业设计说明书 (外文翻译 ) 5 controller only proportional items often is not enough. only items of the ratio of the amplitude error is enlarged, and now need to increase the differential item. it forecasts changes in the tre nd, with the proportion of + differential controller early enough so error control will be able to curb the role of zero, or even negative, in order to avoid the amount charged with a serious overshoot. Therefore, a greater inertia of the object or delay. + ratio differential (PD) controller can improve the dynamic characteristics in the process of adjustment. 5, the parameter tuning PID controller Tuning PID control system design parameters of the core. It was based on PID control the process of determining the ratio coefficient, the size of the time differential and integral time. PID tuning parameters are many ways to sum up, there are two major categories : theoretical calculations tuning. It is mainly based on the mathematical model, the parameters of the controller Through theoretical calculations. This method has been used in the calculations may not be directly, it is also necessary to adjust and engineering. Second tuning method, which mainly rely on engineering experience, the control system directly for the test, and simple method easy to master, which are widely used in engineering practice. PID tuning parameters, the main critical ratio, response and attenuation curves. Three methods have their own characteristics, through their mon test Then in accordance with the empirical formula of the controller tuning parameters. But no matter what kind of methods used by the controller, it was necessary to make a final adjustment and improvement of the actual operation. Now is the critical proportion of the general law. PID controller using this method for setting the parameters of the following steps : (1) First, a preselection of the sampling period short enough to allow the system (2) adding proportional control only link until the step response of critical system for the importation of oscillation Then note the ratio magnification factor and critical oscillations (3) In a certain formula to be adopted under the control parameters of the PID controller PID parameter settin。