Planet bearing fault identification is an attractive but challenging task in numerous engineering applications, such as wind turbine and helicopter transmission systems. However, traditional fault characteristic frequency identification and impulsive feature...
This paper describes how to evaluate the accuracy of prognostic estimates for remaining-useful life (RUL), state of health (SoH), and prognostic horizon (PH). The primary goal of prognostics is to accurately predict future failure in systems. Condition-based...
This paper describes a multiple-variable analysis (MVA) methodology to detect and diagnose three types of faults associated with an electromechanical actuator (EMA): (1) loading faults, such as friction, on the shaft of an EMA motor, (2) shorting faults in the stator...
This paper describes work related to improving the electrical performance of an accelerometer-based sensor, RotoSense™, used for monitoring rolling stock: the locomotives and cars used in trains. At the 2018 MFPT conference, a paper, “Improved RotoSense™ for Rolling...
Vibration detection can be performed by a meter or a single channel spectrum analyzer. The former has quantified vibration amplitude levels since the 1950s, while the latter was able to implement the Fast Fourier Transform (FFT) since the 1960s to break vibration down...
Bearing faults in machinery are among the most critical faults that require attention by maintenance personnel at the early stages of fault initiation. In many cases, it is difficult to directly and accurately identify the fault type and its extent under varying...
One of the limitations of conventional modal testing using a roving impact hammer is that the reference sensor (usually an accelerometer) must remain fixed throughout the test. Since the accelerometer must typically be connected by a wire to the data acquisition...
Attend a maintenance or reliability conference today and you can’t fail to miss the many vendors offering wireless sensors for condition monitoring. Wireless sensor networks offer a way to expand the practice of CBM by making more condition data from more...
During testing on a small gas turbine, frequencies related to the power turbine shaft and a bearing were observed. The frequencies of the fault were not associated with any known bearing on the power turbine shaft. This paper is an investigation of why the observed...
We describe advanced forward-deployed comprehensive fluid analysis for wear debris and fluid condition of lubricating oil, hydraulic oil and fuel. Examples from mechanical systems are given for the detection of wear-related and fluid condition-related faults. ...
For on-shore applications, the support structure for a rotating machine consists of a block foundation and base-frame (base plate) normally known as skid. Adequate dynamic analysis of support structures for rotating equipment is necessary to safeguard other machinery...
This project, sponsored by the Office of Naval Research, integrates oil and vibration analysis to develop a more complete diagnostic and prognostic model for monitoring bearing degradation and performance in the field. The results of this project will be used to...
A cycloid drive for gearboxes allows for a high reduction ratio and zero or very low backlash. The cycloid gear design is based on compression, whereas most gear interactions are based on the shear. Further, the contract of a cycloid gear is typically subject to...
Vibration detection can be performed by a meter or a single channel spectrum analyzer. The former has quantified vibration amplitude levels since the 1950s, while the latter was able to implement the Fast Fourier Transform (FFT) since the 1960s to break vibration down...
This paper presents a case study in diagnosing an excessive pipe vibration due to the beating phenomenon. The outdoor process pipes in a sewage plant were found to vibrate viciously and resulted in emitting loud humming noise that affecting the surrounding community....
For on-shore and grout less design applications, the support structure for a rotating machine consists of a base-frame (base plate) normally known as skid. Most of the time these structures show up with high vibration on machine bearing cap due to structural...
In a Petrochemical Complex, liquid Propylene as a product is transferred by a transfer pump from storage tanks for ship loading / other required facilities. Liquid Propylene has a boiling point of minus 47.7 degrees Celcius, hence operating fluid must be kept below...
This paper describes the relationship between a bathtub curve, failure distributions, and commonly used metrics: mean-time-before failure (MTBF), mean-time between failure (MTBF), and mean-time-to failure (MTTF) – metrics that are often misunderstood and misused. A...
Vibration detection on stationary surfaces of machinery, such as bearing housings, is typically accomplished with accelerometers. Modern accelerometers have been engineered to have a very wide frequency range with strong sensitivity of voltage to surface acceleration....
During operation, it was observed that a specific mechanical system experienced undesirable vibration and it became necessary to understand and mitigate this phenomenon. This document investigates the tools, methodology, and results of the dynamic characterization of...
This paper describes a design for an example of a Prognostic Health Monitoring (PHM) system that is able to detect a state of degraded health and make an accurate prediction of when a resulting future failure in the system is likely to occur in a dual set of...
The paper presents a detailed comparison between the traditional piezoelectric and MEMs based vibration sensors. The future prognoses of what technology and where will be used in the future is discussed. <See More>
The research was performed to show the feasibility and scale-up potential of production of replacement parts for long lead time DoD critical components utilizing a sand 3D-printer with indigenous desert sand to produce casting molds from a digital drawing of the...
There is a growing trend of using unmanned aerial vehicles (UAVs or drones) for inspection of industrial facilities and infrastructure. The types of inspections currently done entail remote sensing using cameras: qualitative assessment and photogrammetry using...
Belt-driven mechatronic systems are popular for a range of applications. A modified robotic manipulator was adapted to allow different belt-drive faults to be incorporated into the mechanism, with additional sensors to characterize the compromised kinematics....
