A GA-Based LQR Control Algorithm of Three-Degree-of-Freedom Vibration Isolation System for TBM's Electronic Target.

In the process of full-face tunnel boring machine (TBM) tunneling, severe vibrations with multi-degree of freedom and large amplitude seriously affect the measurement accuracy of the electronic target of TBM's attitude sensing component. In order to solve this problem, A GA based LQR active vibration isolation control strategy for a three-degree-of-freedom vibration isolation device is proposed. The state space equation of the vibration isolation system is established and the acceleration and pitch angle of the electronic target are selected as the evaluation index of the active vibration isolation system. In order to avoid the non-optimal parameter selection by artificial experience, the genetic algorithm is used to optimize the state variable weighting matrix Q and the control variable weighting matrix R of the LQR control strategy. The simulation analysis of the active vibration isolation effect is carried out in the sensitive frequency band of the electronic target. Compared with the passive vibration isolation system, the Y-direction acceleration of the active vibration isolation system is reduced by 49.3%, the Z-direction acceleration is reduced by 84.6%, and the pitch angle vibration is reduced by 91.5%. The designed three-degree-of-freedom active vibration isolation system effectively suppresses the vibration acting on the electronic target.