Angle monitoring based loose cable recognizing method applied in supporting seat generalized displacement

The invention discloses an angle monitoring based loose cable recognizing method applied in supporting seat generalized displacement. The need of updating a mechanical calculation reference model of a structure is decided by monitoring supporting seat generalized coordinates of the structure, based on angle monitoring, and the mechanical calculation reference model of the structure is updated only when the supporting seat generalized coordinates of the structure vary, so that a new mechanical calculation reference model of the structure included in the supporting seat generalized coordinates of the structure is obtained, and a unit damage monitored quantity variance matrix is obtained by calculating on the basis of the model. A virtual damaged cable can be calculated and recognized according to approximate linear relations between a current strain vector and an initial strain vector, a virtual unit damage strain variance matrix and a current virtual damage vector. After a true damaged cable is identified with