Experimental Study on the Mode of Active Truss

By using a 78-bar space truss, the configuration and properties of a linear active structure are studied experimentally, and the experiment technique for constructing an active structure is practiced in this paper. An active truss is constructed by using piezoelectric stack actuator and adopting linear quadratic optimal control approach for coupling mode space. The modal shapes and modal parameters are measured for active truss and passive truss respectively on dSPACE plate of hardware-in-the-Loop simulation system. In addition, the transfer function of the active truss is measured when it is under a random excitation. It is shown that the damping of an active structure increases as a result of the control means introduced. Meanwhile, difference of the mode is much great between the passive truss and the active one because the mode of the bar is controlled nearby the piezoelectric actuators.