Establishing error sensing strategy by using pseudo-uniform structure quantity for the active rib stiffened double-panel Structure

The active rib stiffened double-panel structure, which promotes the engineering relevance of the active control technic, has superior sound insulation performance in low frequency range and also can be easily implemented in practical engineering. One of the key problems encountered when implementing such system is error sensing strategy. The traditional sensing strategy, such as sensing the radiation modes using distributed piezoelectric sensors, is difficult to implement due to the block of the ribs in the ribbed plate case. Hence, the pseudo-uniform structure quantity proposed recently is adopted to establish the error sensing strategy for the ribbed plate case. This objective function can be obtained by only using single point sensor, and is highly correlated with the radiated power and less sensitive with the error sensor location. The theoretical model of active rib stiffened double-panel structure is established firstly. Then, the objective function of the weighted sum of spatial gradients is presented, where the parameter-based weights are used for broadband frequency control. Simulation results demonstrate that the pseudo-uniform structure quantity is effective for controlling the ribbed plate sound radiation. The control effects are as good as that of the optimal objective function of the radiated sound power.