A FURTHER NOTE ON CLOSED-FORM FORMULAS FOR FUNDAMENTAL VIBRATION FREQUENCY OF BEAMS UNDER OFF-CENTRE LOAD

1997 ◽  
Vol 207 (1) ◽  
pp. 132-135 ◽  
Author(s):  
K.H. Low
Keyword(s):  
Closed Form ◽  
Vibration Frequency ◽  
Fundamental Vibration

Predicted Fundamental Vibration Frequency of a Heavy Electronic Component Mounted on a Printed Circuit Board

1999 ◽  
Vol 122 (1) ◽  
pp. 3-5 ◽  
Author(s):  
Ephraim Suhir
Keyword(s):  
Vibration Frequency ◽  
Printed Circuit Boards ◽  
Printed Circuit Board ◽  
Flexural Rigidity ◽  
Practical Importance ◽  
Electronic Component ◽  
Circuit Board ◽  
Circuit Boards ◽  
Fundamental Vibration ◽  
Printed Circuit

External electric leads, soldered into plated through-holes (PTHs) of printed circuit boards (PCBs), provide, in addition to electrical interconnection, mechanical support for heavy electronic components (such as, say, power ones) mounted on the boards. The leads can possibly break (most likely by fatigue), if the PCB support contour is subjected to excessive oscillations. Such oscillations typically occur at the lowest resonant frequency (fundamental frequency). The ability to predict this frequency and possibly avoid resonance conditions is of obvious practical importance. Accordingly, in this analysis, we develop a simple formula for the evaluation of the fundamental vibration frequency of a heavy electronic component mounted on a PCB. The formula is obtained for the case, when the component has only one row of leads, and the vibrations occur in the direction of the least flexural rigidity of this row. [S1043-7398(00)00601-0]

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