关于传递函数，在学习自动控制系统的时候大家应该非常熟悉了,我们看看英文的描述吧：
A transfer function is the ratio of the output to the input of a system. The system response is determined from the transfer function and the system input. A Laplace transform converts the input from the time domain to the spatial domain by using Laplace transform relations. The transformed spatial input is multiplied by the transfer function to get the output in the spatial domain. It is then converted back to the time domain using an inverse Laplace transform.
This Demonstration shows the responses to a first-order transfer function. You can vary the magnitude of the input and the time constant \[Tau]. The time constant is related to how long a system takes to reach the new steady state. The input can be a step function, a ramp, or a sinusoidal input.（阶跃、斜波、或者正弦输入）。
1、阶跃响应输出