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model is likely a reasonable model for frequency ranges around 0–200Hz, it would not
be appropriate to use at high frequencies near the resonance at 3400Hz. While the addi-
tional complexity of the two-mass system is not required to reproduce the low frequency
behavior of the valve-gear system, damping should be added to the model if accurate repro-
duction of the resonance around 67Hz is desired. This could take the form of an analyti-
cal prediction of friction (Pisano, 1984; Hanachi and Freudenstein, 1986) or a simple
equivalent damper added in parallel to the equivalent spring (Fig. 11.25b) and identified
through experiment, Chen (1982).

REFERENCES

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Chen, F.Y., Mechanics and Design of Cam Mechanisms, Pergamon Press, New York, 1982.
De Silva, C.W., Vibration: Fundamentals and Practice, CRC Press, London, 2000.
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