The invention provides a spatial six-degree-of-freedom motion platform
modal control method. In the invention, a spatial six-degree-of-freedom motion platform
modal matrix is used to convert a strong-
coupling physical space system into a decoupled
modal space
system, a modal control concept is introduced on the basis of the conventional spatial six-degree-of-freedom hydraulic motion platform control, the modal conversion matrix is used to decouple a strong
dynamic coupling six-degree-of-freedom hydraulic motion platform, an expected physical input
signal and a motion platform actual output
signal are converted into modal signals to perform independent modal control regulation, the drive and control of the spatial six-degree-of-freedom hydraulic motion platform are realized, the
coupling influences among the actuators and
degrees of freedom in a spatial six-degree-of-freedom hydraulic motion are weakened effectively, indexes such as the
single degree of freedom motion and multiple degree of freedom motion
reproduction of the six-degree-of-freedom hydraulic motion platform are improved, and the bandwidths of degrees of freedoms besides the close degree of freedom of a first order modal are improved.