Here are the abstracts from presentations you will be seeing at the CMVA Annual Technical Conference on October 26 & 27, 2022 at Niagara Falls, Ontario.
⇒ Click here to download the Technical Schedule (subject to change)
Examination of the FFT Batch Process with Calculation of the RMS Energy
By Jack D. Peters
The Fast Fourier Transform (FFT) is used in vibration analysis. It is well known that Window Filters (Hanning, Flat Top, etc.) can be applied to the time waveform during the batch processing of the FFT, and as a result, decrease the resolution of the FFT. The resolution is decreased by a numerical Window Factor based on the applied filter. It is not well known that the Window Factor (WF) can also be described as the Equivalent Noise Bandwidth (ENBW) or Noise Power Bandwidth. This paper will explain how to calculate the RMS Energy of the FFT when the WF or ENBW used to process the FFT has a numerical value greater than one.
Vibration 101 – Fundamentals for Asset Management and Reliability Professionals
By Matthew Holmes
Although the asset management or reliability professional are not necessarily analyzing vibration spectrum and waveforms, basic understanding of the vibration world goes a long way to understanding why vibration techniques are a cornerstone technology for asset management strategy (ISO 55XXX). This short course will review nine (9) elements of ISO 18436-2 vibration knowledge that provide the asset management or reliability professional with basics knowledge and skills for vibration application – principles, acquisition, processing, monitoring, fault isolation, acceptance testing, diagnostics, severity and balancing.
Hydro generator Vibration Troubleshooting
By Aaron Doyle
This paper follows the case study of troubleshooting elevated and unstable upper guide bearing vibration on a 120 MW Pelton hydro unit following a recent rotor major inspection. Inconsistent responses during testing were observed based on the rate of change of turning speed during startup, bearing and stator temperatures, generator field excitation and therefore magnetic unbalance, as well as generator active and reactive power loading. A single plane field balance procedure was employed near the upper guide bearing to minimize turning speed frequency excitation forces at this location. Additional testing was performed to confirm that vibration levels were successfully reduced to within acceptable limits for normal operating regimes allowing for unrestricted release to operations. However, this only addressed the symptoms and not the root cause which is believed to be related to early indications of fitment issues, either, the thrust block to shaft and/or of the generator rotor rim to spider due to aging. Further investigation will be performed on a sister unit which anecdotally seems to have a similar issue at an upcoming outage. More to come…
Primary Heat Transport Pressurizing Pump – Commissioning Problems
By James Chin Yut
This case study summarizes the problem of repeat thrust bearing failures encountered during the commissioning of the primary heat transport (PHT) pressurization pumps and the resolution of the issue. The PHT pressurizing pumps is an Ingersoll Rand – HMTA, 10 stage pump designed with impeller suction facing the same direction creating a resultant thrust which is absorbed by the balance drum and thrust bearings. The pumps were initially commissioned in the 1970’s. The PHT system is a closed loop that removes heat from the reactor fuel and transports to the boilers, the PHT pressurizing pumps is used to maintain the system pressure of the system. U2 was in laid up state and had undergone a major refurbishment. During the pump start up of 2-33310-P2, the thrust bearing failed within 20 seconds. Resolution of repeat failures required the understanding of the cause, revising the maintenance procedures to resolve the problem. Keyword: Precision Maintenance.
High Vibration on Hydroelectric Headgate Hoist during Commissioning
By Bernard F Boueri
During commissioning of a new headgate hoist, high vibration levels were noted on the fan break bearings during emergency drop. The vibration levels were significantly higher than those measured during the factory acceptance test (FAT). In depth measurements indicated higher than expected running speeds leading to excitation of shaft critical speed in additional to possible structural resonance. A detailed analysis will be presented on the vibration measurements and the findings including assembly issues of the entire hoist.
Pickering B Emergency Low Pressure Service Water (ELPSW) Pump Vibration Case Study
By Andrew Ali
“There are 4 ELPSW vertical pump-motor sets per Unit (5/6/7/8-71310-P1/2/3/4) for a total of 16 across Pickering B units. Although the Pickering B ELPSW pumps were intended to provide backup cooling water flow, they are commonly used for continuous service with the unit at power. There has been elevated vibration levels at the motor locations and this was addressed by a dynamic absorber mass installed at motor non-drive end to eliminate resonance at running speed. However, recently there has been increases in vibration levels at the motor locations that required further troubleshooting to determine the cause.
Case study of a Power Turbine
By Gary (Guangxing) Zhang
A power turbine had been experiencing vibration trips during normal operation. During the event, a one-half (1/2X) vibration component emerged in the spectrum. This usually a good indication of that a light rubbing may have been developed at a seal area. Data analysis helped understand its vibration behavior and locate the rubbing area. The understanding was rather helpful for maintenance and operation teams going forward.
A Proven Approach to Condition Monitoring for Reciprocating Machinery
By Edward Kelleher
Traditional Vibration Analysis (VA) or Spectrum VA is widely utilized on rotating machinery in all types of industrial applications to diagnose and troubleshoot machinery issues. In conjunction with other technologies, VA allows predictive maintenance personnel to pinpoint machinery failures like unbalance, misalignment, bearing issues, etc. This diagnosis is completed by analyzing the vibration frequency spectrum of an event and its correlation to the machine and conditions. For reciprocating machinery, however, spectrum analysis is not the most effective tool for determining defects as the expected mechanical events and the failure modes are best identified in a time-based waveform and referenced to a known point on each cylinder such as Top Dead Center (TDC). In the reciprocating analysis world, this is known as crank angle-based data, which does not utilize the frequency spectrum, but rather examines events relative to crankshaft positions. By combining vibration in different frequency ranges with in-cylinder pressure data and utilizing basic thermodynamic and combustion principles, it is possible to determine defects in reciprocating machine equipment such as compressor cross head damage and cylinder leakage (valves, rings, and packing) as well as engine valve train and cylinder-related issues. This paper will provide an overview of engine and compressor analysis and explain how crank angle-based data can pinpoint issues as compared to traditional VA. A review of ISO Guidelines for reciprocating compressors will also be discussed.
What can go wrong with vibration sensors?
By Mateusz Bujak
Subjects covered in presentation are putting attention on challenges which are connected to vibration sensors details to be successful with projects.
1) Vibration sensors details as part of Reliability Culture Implementation
2) Selection of right type of output
3) Selection of proper sensitivity – over saturation and too low signal
4) Internal sensor construction
5) Enviromental conditions
7) RFI interference
8) Mounting aspect
Oil Sample Procedures and Used Oil Analysis Interpretation
By Bahshad Sabah
“Oil sampling is one the ways to check and identify the health of an equipment, which can prevent a costly unexpected shut down and / or equipment repair. The knowledge of oil sampling, its best practices, and Oil Analysis and Result Interpretation plays a crucial and critical role in proactive / predictive maintenance planning. The corrective actions can save millions of dollars of production. In this presentation, I will cover the followings:
– Justification for Oil Sampling and Oil Analysis
– Best Practices in Oil Sampling
– Oil Analysis and Result Interpretation”
Experimental and Numerical (FEA) Investigation of Vibration Modes of Propeller Type Blade of a Hydro Turbine
By Hassan Kazi
Runners of hydroelectric power generation system are subjected to various excitation mechanisms. The natural frequencies and mode shapes are important parameters which determines the behavior and response of the runner to different excitations. One of the important aspects of dynamic response of runner is the effect of water known as added mass effect. Added mass effect lowers the natural frequency of a system while submerged in water as compared to in air. This paper presents the mode shapes of a propeller type runner blade determined experimentally and through Finite Element Analaysis (FEA). Good agreement was found between the experimental and FEA results. FEA analysis was further extended to include the added mass effect and determine the natural frequencies and mode shaped in water. The results are compared and discussed.
Wireless Sensor Technology – A New Era for Data Security
By Michael David Howard
As wireless sensor technology begins to take the leading edge within the industrial internet of things community, a new era of data security has emerged that requires diligent thought and consideration on the part of end users, system integrators and key stake holders. Critical machine health and process data being transmitted wirelessly and hosted internally as well as externally creates an entirely new series of security concerns that must clearly be understood to maximize the value of the technology. This presentation will focus on the key security tools available to end users to ensure the security of their data when deploying wireless sensor networks and hosting data internally as well as externally to their organizations.
Wanted – Vibration Analyst
By Jack D. Peters
Personal thoughts on where we have been and where we are going with vibration analysis.
My 30 years of experience as a reliability specialist
By Louis Lavallée
“A career in vibration analysis cannot be improvised. It takes a whole entourage to train a good analyst. Interest in vibration analysis begins early, with the influence of a teacher, the expertise of a consultant who came to diagnose an old compressor or a colleague who is himself a reliability specialist. Then comes the CAT I training and certification, and CAT II, a few years later. These trainings allow the analyst to understand the basics of the job; but this is not enough. The reliability specialist is regularly confronted with new problems, with new machines, which often behave strangely. To overcome this, the analyst will have to pursue training of all kinds throughout his career: lubrication, thermography, etc. He will also have to surround himself with mentors, more experienced analysts who will help him through his many diagnoses. The CMVA is one of many tools that help analysts make new contacts, learn and gain experience. Being an analyst is not only technical, it is also having the qualities of a diplomat! When it comes to stopping a plant following the diagnosis of a serious problem with an engine bearing, it is not always easy. It takes tact and a lot of credibility. This work also requires high availability: the machines don’t always break down at 9 a.m. on Monday morning. In summary, this work is not routine and almost requires a vocation!”
Online vibration monitoring system selection and installation – trials, tribulations and successes
By Dora Orchard & Brandon Grant
The selection and installation of an online vibration monitoring system can be a complicated task with many variables and potential problems to be aware of. Considerations include cost, availability of components and replacement parts, warranties, ease of installation, configuration and maintenance. The least or most expensive system may not be the ‘best’ for your reliably program goals, and those goals may not be clearly defined. This paper discusses some of the experiences of the authors’ observations over the last 20+ years of being involved with online vibration systems, including the more recent and increasingly popular wireless systems. Pricing, physical characteristics, long term considerations including maintenance and software evolution will be included in the discussion.
The Electric Motors and Their Vibration
By Louis Lavallée
Most of the equipment that we monitor every day is driven by an electric motor. All these motors may look similar but, they are different. Each motor has been selected for a specific application. When looking inside the motor, we can see that the rotor and the stator are different from one motor to another one. This will modify the behavior of the motor. A motor design for driving a compressor will not necessarily fit for a water pump or a conveyor. Theses difference in their construction will have an important influence on their own vibration. In this presentation we will examine different types of motors and their vibration.
An Infrared camera must be considered a vital maintenance tool
By Paul Frisk
The basic intent of a well-designed maintenance program is to reduce the risk of premature failure and insure the continued operations of components and/or assemblies. The success of the maintenance system is based on the seamless integration of multiple diagnostic disciplines, of which infrared scanning must be an integral part of. An infrared camera, along with a properly trained thermographer, can determine the “current health/condition” of a component or system that is being monitored. The camera provides ital information in a non-contact, non-destructive real-time imagery methodology.The infrared camera has become a vital diagnostic tool in the monitoring of mechanical systems. Long, costly downtimes can be reduced, if not illuminated. For example, when considering electric motor systems, “thermal imaging is a well-documented method used to detect conditions such as loose connections; overloaded phases and circuits; bearing problems, hot spots or overloaded motors and other thermal faults” (Dr. Howard Penrose – 2003 InfraMation conference).The presentation will explore, with examples, the avenues where the infrared camera is a useful, cost saving maintenance tool in mechanical, electrical, and other applications.
Ball Mill Health Assessments
By Jim Lindblad & Matthew Holmes
Ball mills are an essential part of media grinding for industry including mineral extraction in mining, lime processing, metallurgical coal extraction and thermal coal power plant firing. The understanding of ball mill health is integrally linked to the drive train components (motor, reducer, pinion) health as well. This presentation will review the condition based monitoring technology and guidelines for assessing health of the complete ball mill and drive train; including pinion bearing and reducer gear mesh defects.
By Charles Gagné
In the presentation, I will cover some of the most frequently asked questions about this technology: What is Motion Amplification®? How does it work? Where is it useful? Is the technology evolving? Case studies will be presented for different field of expertise like in machine maintenance, test and R&D, civil work and conservation.