We conducted various investigation of energy recycling semi-active vibration suppression method by using piezoelectric
transducers attached to structures. In this method, piezoelectric transducers are connected to a shunt circuit with diodes
and an inductance, and it makes better use of counter electromotive force to suppress the vibration. We had proposed
some new ideas in order to upgrade this method. And we verified their high performances compared to conventional
semi-active method by many experiments. In results of experiment that practically apply this method to an actual satellite
structural model using lots of the piezoelectric transducer, it was found that vibration suppression performance depend
on how piezoelectric transducers were connected each other. It is because their connection affects a resonance frequency and a total resistance of the shunt circuit. The performance of the method related to the connection of the piezoelectric transducers and their resistances dependent on frequency are described using experimental results in this paper.
This paper presents a self-sensing method for semi-active vibration suppression that measures only the value of piezoelectric voltage. This self-sensing method is implemented with a Kalman filter with extended system equations, instead of the conventional bridge-circuit technique. The method has several advantages over the bridge-circuit self-sensing method, such as being applicable to MIMO systems. Experiments showed that our selfsensing system suppressed vibrations by combining the state-switching control and the synchronized-switching control. We confirmed that the self-sensing method is robust against model errors through the experiment with intentional frequency shift.