Abstract
In general, modules are supported by stiff leads and possess a higher K/M ratio than the cards and boards to which they are attached. In the module/ lead/card system, the card is the most flexible element; the fundamental natural frequency f 1 for circuit cards is generally between 20 and 50 Hz, and even for multimodule stiff cards or stiffened boards, it seldom exceeds 200 Hz. With the stiffnesses and dimensions of modules and leads discussed in Chapters 3,7, and 8 (consider K = 100 N/mm and the mass of a 25-mm module m = 2 g supported on 68 gull wing leads), the lowest frequency of the lead-supported module is 9.3 kHz. The fundamental frequency f 1 of the leads alone is, taking a lumped mass of 2 mg, about 36 kHz.
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Engel, P.A. (1993). Dynamic Response of Circuit Card Systems. In: Structural Analysis of Printed Circuit Board Systems. Mechanical Engineering Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-0915-7_12
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DOI: https://doi.org/10.1007/978-1-4612-0915-7_12
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