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Ultrasound for the non-invasive measurement of IC engine piston skirt lubricant films

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Figure

Figure 1. Engine sensory instrumentation.
Table 2. Engine component and lubricant acoustic properties.
Figure 2. Depiction of reflection occurring at skirt interface and subsequent processing steps carried out for each capturedreflection.
Figure 3. Skirt film measurements for full engine cycle under motored conditions (with gas exchange), rotating at 4000 r/min.
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