52 H. Laos Fig. 5.16 Frequency response (μ=0.0400); jump phenomena—paths to follow Fig. 5.17 Transient result for μ=0.0400 5.10 Conclusions – The results from the nonlinear calculations compare well with the steady-state values if the unbalances are in the low- to moderate-value range. – The practice of accelerating the rotor during the run-up reduces the amplitudes of motion in the rotor-bearing system, which facilitates crossing through the critical speeds. The same angular acceleration value (but with the opposite sign) should be used during the coast-down to minimize the amplitudes of motion as well.
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