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Operating Limits for Acoustic Measurement of Rolling Bearing Oil Film Thickness

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Figure

Fig. 1—Schematic illustration of the reflection of an ultrasonic wave froma layer between two media.
Fig. 3—Schematic diagram of the experimental apparatus used to gener-ate an elastohydrodynamic film for a ball sliding on a flat.
Fig. 4—Four reflected pulses in the frequency domain. The reference pulse is reflected from a steel-oil interface (with no ball in contact)
Fig. 6—Layer stiffness against frequency calculated using the spring model (Eq. [3]) from reflection data for three ball rotational speeds.
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