TY - JOUR T1 - Applying the Hilbert Envelope method to refine the ultrasonic technique for piston ring oil film thickness measurements in a marine diesel engine JO - SAE International Journal of Engines PY - 2022/04/21 AU - Rooke J AU - Li X AU - Dwyer-Joyce RS ED - DO - DOI: 10.4271/03-16-02-0011 PB - SAE International VL - 16 IS - 2 Y2 - 2025/08/13 ER -