Analysis of High-Speed Engine Valve Vibrations Using Statistical Methods
High-speed engines used in natural gas gathering applications have been shown to have a history of power valve failures. This is especially true for exhaust valves, due to the high temperature environment to which the valve is exposed. A methodology for analyzing valve closing events using statistical techniques has the potential for practical and effective prognosis of valve failures. Methodologies for analyzing vibration signatures of a valve closing event are discussed. This includes an ongoing investigation into observed vibration variability and its correlation to failure modes. Statistical techniques are used to analyze long-term vibration patterns. Additional topics covered are valve vibration signatures as a function of engine load and RPM. This paper will present first-order differences between a nominally healthy valve and one that is approaching failure based on statistical analysis. Since this is an ongoing investigation, the conclusions presented are considered preliminary and will lead to additional research.