The interaction of vibratory traveling waves in rotating components with adjacent structures is examined. In the most general case, a resonance can occur when the wave propagation speed for a nodal diameter n mode in rotor 1 is equal in speed and direction to the rotational speed of an adjacent structure ω2. When ω2 = 0 this structure is a stator and the phenomenon is a major resonance, as discussed in Wilfred Campbell’s paper [1] of 1924. An identical phenomena can occur when ω2 ≠ 0 between rotor 1 and a co- or counter-rotating rotor 2 if a suitable harmonic excitation is generated. Description of component test results which demonstrated this resonance mechanism is provided.

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