Optimizing Printed Circuit Board Assembly Mounting Support Through Experimental Modal Analysis, Finite Element Verification, and Vibration Testing

Vibration analysis of printed circuit boards (PCBs) plays a pivotal role in ensuring the reliability and performance of electronic devices exposed to mechanical stress and vibrations during their operational lifespan. This paper delves into the intricate interplay of mounting configurations on the natural frequencies and vibrations of a microcontroller component strategically positioned at the center of a printed circuit board (PCB). The study commences with a detailed simulation of the PCB using ANSYS software, further refining the physical properties of the Printed Circuit Board Assembly (PCBA) to optimize its performance. This optimization process hinges upon the insights derived from experimental modal analysis facilitated by modal hammer testing. Subsequently, a comprehensive sinusoidal sweep test is meticulously executed on the PCBA, employing three distinct mounting configurations. The velocities of various critical points on the PCBA are judiciously measured through the utilization of a Doppler laser. The selection of the safest mounting configuration for the PCBA is predicated upon the discerned local and global frequency response functions, thereby bolstering the PCB s reliability and performance under mechanical stress and vibrations. The sweep test is conducted with an electrodynamic shaker, ensuring precise and controlled excitation throughout the experimental process.