Study on Dynamic Properties of a Varying-Pitch Helical Compression Spring

概要

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A varying-pitch helical compression spring is often used under high speed excitation, but its fundamental dynamic properties have not been elucidated. In this paper the dynamic properties of a varying-pitch spring subjected to a sinusoidal excitation are investigated theoretically and experimentally. The theoretical analysis is done by solving a one-dimensional wave equation with unknown boundary conditions varying with time. (1) The amplitude-frequency curve of a varying-pitch spring is similar to that of a single-degree of freedom system in which the spring control takes a nonlinear symmetrical form. (2) The theoretical results well coincide with the experimental ones. (3) The dynamic stress in a varying-pitch spring is lower than the one in the equal-pitch spring. The reason is considered that the dynamic energy is dispersed during the repetition of contact and separation of the adjacent coils of the varying-pitch spring.
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