472 L. Gaul and A. Schmidt Fig. 43.1 3-D view of the two-disc rotor Fig. 43.2 Calculated contact pressure distribution between rotor and shrunk-on disc 43.3 Layout of the Generic Joint Experiment Since the contact parameters between rotor and discs are known in terms of surface roughness, contact pressure and frequency, a generic experiment can be conducted in order to determine the corresponding isolated joint’s parameters. Figure 43.3 shows the measurement set-up. It consists of two small contact interfaces which are pressed against each other. The normal force in the joint is controlled by a bolt and measured by a force measurement ring. An excitation of the joint in the axial direction is realized by two masses on both sides of the joint where one mass is attached to a shaker. The mass shown on the right is connected to a leaf spring, such that the set-up is a two-mass resonator. When the resonance frequency is transmitted the axial force is increased considerably. On both sides of the joint two 3-dimensional accelerometers are placed. Their signals are used for the calculation of the relative displacement and therefore also for the stiffness of the joint and its dissipation behavior (see Sect. 43.4). The boundary conditions for this generic experiment are known from the examination of the two-disc rotor: an experiment should be conducted with normal pressure of about 100 MPa and an excitation frequency nearby 165 Hz. The surface roughness also corresponds to the two-disc rotor.
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