Study on the Vibration Response of Electronic Equipment Considering Frequency-dependent Normal Contact Stiffness
The frequency-dependent normal contact stiffness at the structural interfaces in electronic equipment has a significant impact on the dynamic characteristics of the internal circuit boards.To investigate the influence of normal contact stiffness at different interfaces on the internal circuit boards of electronic equipment and the finite element modeling method for frequency-dependent normal contact stiffness,research is conducted using a combination of experiments and simulations.First,to study the impact of normal contact stiffness at different interface junctions on electronic equipment,four different contact conditions are designed,and frequency response tests under the same excitation conditions are carried out on electronic equipment for each condition.Next,the normal contact stiffness is considered in the finite element analysis of electronic devices,and the BUSH element is used to model the normal contact stiffness for different contact conditions,adjusting the stiffness of the BUSH element with frequency change according to experimental results.The experimental results confirm that the normal contact stiffness in the structure of electronic devices has a noticeable influence on the vibration response of the devices.Subsequently,by considering the frequency-dependent characteristics of the normal contact stiffness as well as its frequency variability in the simulation analysis,a good agreement is achieved between the simulation analysis results and the experimental findings.
electronic equipmentnormal contact stiffnessfinite element analysisstructural dynamics
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