Abstract
In the present study, it could be shown that by integration of a piezoceramic transducer in a fiber-reinforced door side panel, a flat loudspeaker can be realized. Taking into account the given restrictions, the integration position has been identified, where the geometry decouples the vibrating membrane from the supporting surface. With the help of an acoustic finite-element simulation, the main design variables of the integration position were found and the relevant effects for sound radiation were made visible. The manufacturing of the test specimen with piezoceramic transducers was performed using vacuum-assisted resin infusion and the long fiber injection procedure. The effect on the real sound radiation behavior of the door side panel with a material-immanent loudspeaker was experimentally determined using laser scanning vibrometry and sound pressure measurements. The presented work shows, for the first time, the high potential of acoustic functionalization of lightweight structures during the manufacturing process for the realization of lightweight and space-saving loudspeakers in a production-ready process.
Highlights
The car became the most used audio listening environment for high-quality audio output [1].On the one hand, the in-car audio experience is getting even more important considering increasing leisure time coming, with progressing autonomous driving [2]
An adaptronic, piezoceramic-driven loudspeaker for an automotive door side panel is presented, which is characterized by low weight, low installation space, and a good possibility to integrate during the manufacturing process
#3 leads to the formation of secondary sound sources or a radiation, an excitation in area
Summary
The car became the most used audio listening environment for high-quality audio output [1]. The in-car audio experience is getting even more important considering increasing leisure time coming, with progressing autonomous driving [2]. The persisting trend towards lightweight designs due to energy saving causes a decrease of the system’s damping and increased cabin noise level [3]. A sufficient acoustical quality can be reached. A promising alternative is posed by a flat panel loudspeaker design, due to its lower mass and invisible integration [5]. Such loudspeakers use vibrations of existing components with
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