According to the feature of sampling space domain torque

this paper defines the space domain frequency

and presents the approach to analyzing gear drive system with space domain torque in space displacement coordinate system instead of time system. It includes space domain spectrum analysis of torque from gear drive system

calculation of space domain frequency

post processing of spectrum

eigen vector and its relations with the structure parameters of gear drive system

method of application etc. This approach is especilly suitable for rotary mechanical systems

such as gear transmission system.