where 1 is the EDR of the 2 direction at the 3 mode. When the value is 100%, the CVIS is completely decoupled in this mode; that is, vibration occurs only in one direction. Practically, it is difficult to achieve the complete decoupling of one CVIS, so in this research, the EDR in the main vibration direction is greater than 90%, and the EDR in other directions is greater than 80%.