3.2 Typical test signals for time response of control systems e Unlike many electrical circuits and communication systems, The input excitations to many practical control systems are not known ahead of time In many cases the actual inputs of a control system may vary in random fashions with respect to time For the purpose of analysis and design, it is necessary to assume some basic types of input functions so that the performance of a system can be evaluated with respect to this signals By selecting these basic test signals properly not only the mathematical treatment of the problem is systematized, but the responses due to this inputs allow the prediction of the systems performance to other more complex inputs In a design problem performance criteria may be specified with respect to these test signals so that a system may be designed to meet the criteria. To facilitate the time-domain analysis, the following deterministic test signal are often used 2022-2-11 32022-2-11 3 3.2 Typical test signals for time response of control systems ¨ Unlike many electrical circuits and communication systems ,The input excitations to many practical control systems are not known ahead of time .In many cases ,the actual inputs of a control system may vary in random fashions with respect to time. ¨ For the purpose of analysis and design ,it is necessary to assume some basic types of input functions so that the performance of a system can be evaluated with respect to this signals .By selecting these basic test signals properly ,not only the mathematical treatment of the problem is systematized ,but the responses due to this inputs allow the prediction of the systems performance to other more complex inputs .In a design problem ,performance criteria may be specified with respect to these test signals so that a system may be designed to meet the criteria. To facilitate the time-domain analysis ,the following deterministic test signal are often used