Time domain analysis refers to the analysis of the stability, transient and steady-state performance of the control system according to the time domain expression of the output under a certain input. Because time domain analysis is a method to analyze the system directly in time domain, time domain analysis has the advantages of intuition and accuracy. The time domain representation of system output can be obtained by differential equation or transfer function.

Introduction of indicators:

When the initial value of time domain analysis is zero, the transfer function is generally used for learning, and the performance index of the system is indirectly evaluated through the transfer function. Specifically, the performance of the closed-loop system is analyzed according to the poles and zeros of the transfer function. This is also called complex frequency domain analysis. Taking time as an independent variable to describe the change of physical quantity is the most basic and intuitive expression form of signal.

The filtering, amplification, statistical feature calculation and correlation analysis of signals in time domain are collectively called time domain analysis of signals. Through the time domain analysis method, the signal-to-noise ratio can be effectively improved, the similarity and correlation of signal waveforms at different times can be obtained, and the characteristic parameters reflecting the running state of mechanical equipment can be obtained, which can provide effective information for dynamic analysis and fault diagnosis of mechanical systems.

Expand knowledge:

Time domain describes the relationship between mathematical function or physical signal and time. For example, the time domain waveform of a signal can represent the change of the signal with time. Time domain describes the relationship between mathematical function or physical signal and time. For example, the time domain waveform of a signal can represent the change of the signal with time.

1, time domain description:

If discrete time is considered, at each discrete time point, the value of the function or signal in the time domain is known. If continuous time is considered, the value of a function or signal at any time is known. When studying time-domain signals, oscilloscopes are often used to convert signals into time-domain waveforms.

2. Conversion between time domain and frequency domain

In electronics, control systems and statistics, frequency domain refers to the frequency-related part of an analysis function or signal, rather than the time-related part, as opposed to the word time domain.