Identification of Natural Frequency and form of Oscillation for Electronic Packages Subjected to Vibration

The paper represents identification of natural frequency and form of oscillation for the main construction elements of the electronic packages such as printed circuit boards, walls of the cases and other bearing parts subjected to vibration and shocks during operation. The current study is focused on using elements of plate bending theory, in which main boards, case walls and other planar rectangular structures are considered as equivalent homogeneous plates, in order to estimate their natural frequencies and forms of free cross oscillations and hence to identify their possible resonances with purpose to avoid them and correspondent dangerous operational modes. The significant attention was paid to the experimental research of dynamic characteristics conducted by using experimental setup created on the base of reverse and direct piezoelectric effects and also the shaker with vibration test cross appliance, representing results in form of Chladni figures and amplitude frequency response.