Abstract
A multilayer ceramic capacitor (MLCC) vibrates when a pulse signal or a periodic signal is applied due to the piezoelectric characteristics of the MLCC, which causes structural resonance and acoustic noise in the Solid State Drive (SSD). Since MLCC is attached to the SSD through solders, the vibration of MLCC can be treated as a complex input to the SSD in which normal force and moment are combined. If the excitation force and moment of the MLCC can be substituted into simplified nodal forces, the vibration and acoustic noise response of the PCB due to the location and direction of the MLCC can be efficiently calculated and analyzed. In this study, the vibration and acoustic noise of the SSD due to the vibration of the MLCC were calculated in various methods. By the blocked force method, the excitation force and moment of the MLCC was obtained. Then, the excitation force and moment of the MLCC were replaced by equivalent nodal forces. Vibration of SSD due to MLCC excitation was calculated with the mode superposition method. The radiated sound was estimated from the radiation resistance matrix and the surface velocity of the SSD by the discrete calculation method. Finally, the vibration and acoustic noise response by simplified nodal forces were compared with the response by piezoelectric analysis of MLCC and PCB.
