Virtual Formation of a Woofer at the Roof Panel of a Vehicle by Using Array Actuators

Spectrally smooth and spatially uniform sound radiation from a thin plate structure using band gaps

“…In this regard, flat panel loudspeakers (FPSs) [4,5] which produce sound using a flat and thin panel excited by several actuators have attracted engineers to add an acoustic function for devices where allowable spaces are limited, e.g. for display panels [2,6] and in automobiles [3,7]. In contrast to the conventional loudspeaker drivers, the FPS uses the dense modes of a thin panel to generate sound.…”

“…Additionally, vibration control methods tackled the problem by means of signal processing, e.g. the modal crossover network, which selectively excites specific modes by balancing modal forces [17], and shaping the vibration profile using active vibration control based on an array of actuators [3,7,[18][19][20][21]. These previous works mainly focused on determining the excitation and mode distributions of a panel structure, but it is still challenging to solve the fundamental issue of sparse modes at low frequencies.…”