4. RESULT AND DISCUSSION.
In the analysis stage, the author conducted the mass of electronic component characteristics of a printed circuit board in many different positions. This mass was localized in specific places, as shown in Table 4; this table, which shows the natural frequencies of printed circuit boards with a mass of 25 grams in different positions. Simultaneously, the board iswas fixed rigidly inon both shorter sides.
AnalysisThe analysis process showed that the natural frequencies of PCB with a concentrated mass were less than the natural frequencies of PCB without a concentrated mass. dependingDepending on the position of the concentrated mass, as shown in Fig.3, these different locations ladsled to different vibration characteristics. From another side, the locatedlocation of mass had a significant effect on the vibrational modes of PCB, this. This sign was different modes depending on the location of the concentrated mass on the board, that. That means it is necessary to take account the location and weight .