ON THE EFFECT OF FRICTION OF LAMINATED SPRINGS ON THEIR VIBRATION CHARACTERISTICS

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Making leaves of 20mm×3mm section from a spring steel, we assembled model laminated springs of cantilever. The spans were 300mm, off-set were uniform steps and the number of leaves were 3, 5 and 7. The frictional coefficients of the laminated springs were 0.017, 0.028 and 0.040, respectively.We studied the characteristics of the vibrating systems consisted of these springs and the mass attached to the springs. Exciting the sprung mass, we observed the exciting frequency and the full amplitude; experiments were done at the frequency up to 400 cpm. and the full amplitude of the mass up to 2mm.The results: At certain exciting forces, there were differences in the vibration characteristics when the exciting frequency was increasing and the case when it was decreasing, as it usually occurs in the non-linear vibrating systems. Considering that the area of static load-deflection hysteresis curve means the energy loss during 1 cycle, and that resonance occurs when the loss becomes equal to the input energy, we can estimate the resonant amplitude of the system. It becomes clear that difference between the observed and the estimated amplitude is below 20%.
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