The Use Of Peakvue
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The Use Of Peakvue For Fault Detection And Severity Assessment: Demonstrated Through Representative Case Studies
by James C. Robinson
Abstract
This paper provides a brief explanation of stress wave analysis as applied to the condition monitoring of rotating equipment. It later introduces the copyrighted Peakvue technique used in CSI (Emerson Process) equipment. A detailed description of the technique is given along with recommendations on measurement setup, sensor mounting & alarm levels for trending. The paper concludes with three case histories which illustrate the use of Peakvue to solve real machinery problems. For those wanting to learn about the Peakvue technique, stress wave analysis, or bearing defect analysis in general, this paper is a great choice.
PREVIEW
“1.0 Introduction:
Many faults within rotating machinery will introduce both vibration and stress wave* activity. Both provide 1) a means of detecting the presence of a fault and 2) means of classifying the severity of the fault. In this paper, the emphasis is place on stress wave activity:
In the next section, stress wave generation, propagation, detection, and the analysis methodology are presented. The third section will present recommended measurement setup for 1) data capture and analysis and 2) parameters for trending with alert/fault levels. The fourth section will consist of several case studies selected to illustrate both benefits and expected behavior of stress wave analysis applied to condition monitoring programs for industrial rotating machinery. The last section consists of conclusions and recommendation for stress wave analysis.
2.0 Stress Waves
2.1 Introduction
In this section, the intent is to present a basic discussion on the generation of stress waves commonly induced from faults within rotating machinery. The propagation for these stress waves from the initiation site to the detection site, role of the sensor in the detection of stress waves from various sources, and the analysis methodology employed by CSI.
2.2 Quantitative Framework for Understanding Stress Waves
Stress Waves can be generated in any elastic medium. The primary interest focused on within this study is in rotating machinery. Stress waves accompany the sudden displacement of small amounts of material in a very short time period.’ In rotating machinery, this occurs when impacting, fatigue cracking, scuffing, abrasive wear, etc. occurs. The most frequent occurrences of stress wave generation in rotating machinery are observed in fault initiation and progression in both rolling element bearings and in gear teeth. Once the stress waves are generated, they propagate away from the initiation site at the speed of sound in the particular medium (metal) being evaluated.
A quantitative framework for the generation and detection of stress waves can be developed using the Hertz theory for metal-to-metal impacting and wave theory3 for propagation of stress waves in metal. We consider the brief discussion presented below on the theory of generation and propagation of stress waves to provide insight to:
*Stress waves introduced by many faults in rotating machinery are short term transient events which introduce ripple on the machinery surface as they propagate away from the initiation site.”
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