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vibration analysis

Asset Condition Management

Getting to the Point with Vibration Collection Data

We often hear about the need to acquire vibration measurements at precisely the same location each time we measure a point. Why is this important? In order for vibration measurements to be

How ...

Asset Condition Management

How is Vibration Described?

By watching, feeling, and listening to machine vibration, we can sometimes roughly determine the severity of the vibration. We may observe that certain kinds of machine vibration appear 'rough',

How is Machine Vibration Data Collected?

By Commtest Instruments

As machine surroundings are often hazardous and uncomfortable, vibration analysis is normally performed away from the machine. To do this, measurements are usually recorded with the instrument then transported to an office where the recorded data can be analyzed in a quiet and safe environment. In the office, the data can be transferred to a computer for more detailed analysis.

Asset Condition Management

What is Shock Pulse Method?

Shock Pulse Method is a signal processing technique used to measure metal impact and rolling noise such as those found in rolling element bearings and gears. Much more refined than other high frequency measurements, Shock Pulse is widely used throughout the world as a basis for predictive maintenance. Rolling element bearings are the most common measurement for Shock Pulse but the measurement technique has a number of other applications such as gear condition, compressor condition and other applications where metal-to-metal contact is a source of wear.

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How is Vibration Measured?

By Commtest Instruments

Fig 34

In the last section we identified the most important vibration analysis tool as the spectrum. When we measure machine vibration we usually measure vibration spectra, since the spectrum of a vibrating component tells us a great deal about the condition of the component as well as about the cause of vibration. Naturally it is vital that the spectrum, which gives such valuable information, be obtained accurately.

What guidelines must be observed to ensure measurements are accurate? How should measurements be taken and for which machines should they be taken?

Standardization of Absolute Vibration Level and Damage Factors for Machinery Health Monitoring

An attempt has been made to study the vibration level of various machine tools to explore the possibility of establishing the standard vibration level. Till today no vibration standards are available for determining the acceptable vibration level for specific machine tools. However there are some standards available that gives an indication of machinery health based on overall vibration level like ISO 2372 (RMS velocity in the frequency range 10 Hz to 1kHz) and Canadian specifications (RMS velocity in the frequency range 10Hz to 10kHz). But these standards are made for general purpose machinery like pumps, motors, generators and so on. The present study is aimed at establishing the vibration standards for precision machine tools. The machine tools are first segregated and then their vibration data are analyzed for determining the normal vibration level and damage factors (DF). After refining and fixing the vibration standards obtained, they can be used to assess the machinery health.

Measuring Shock Pulse another approach to Front Line Condition Monitoring

Downtime in a paper mill or any 24/7 facility is very expensive in maintenance costs, but even more so in the impact to profit because of production loss. In this article we will explain the Shock Pulse Method, why it's a good choice for frontline vibration measurement and show the resulting savings that the Hallsta Mill in Sweden realized from utilizing it as the primary component of its Condition Based Maintenance Program.

Hallsta personnel determined these calculations when they looked at the number of incidents in which they were able to perform maintenance in a planned shutdown, instead of taking the equipment (and production line) down.

Condition monitoring should always start with a list of machine faults, specific for each machine. Only if you know exactly what you expect from the monitoring method, can you apply it efficiently and correctly. Otherwise, there is a danger that you will simply be collecting data. And data is of no use unless it is converted to useful information that you can act upon to realize your true goal of maintaining plant equipment in good working order.

Comparing Electrical Signature Analysis (ESA) and Machinery Vibration Analysis (MVA) 004
Asset Condition Management

Comparing Electrical Signature Analysis (ESA) and Machinery Vibration Analysis (MVA) 004

Rotating machinery exhibit specific characteristics when faults create unwanted mechanical motion. For over 70 years Machinery Vibration Analysis has been the main method used to identify many of these faults. Recent experience and research have proven that many of these same faults can be identified using Electrical Signature Analysis (ESA). ESA also provides very important information regarding the condition of the incoming power to the motor, as well as possible electrical faults in the motor system undetectable using MVA. This presentation discusses the faults that are identified and how they present themselves in both the Vibration spectrum and the Electrical spectrum. ESA is emerging as a very important part of a plant's Electrical predictive maintenance program. In some plants it is being used as the main detection tool used to identify both electrical and mechanical problems on machines which are driven by electric motors.

A Look into Pulse Theory And Why the Walls of Jericho Fell

An excerpt from the book Vibration Spectrum Analysis by Steve Goldman P.E.

This author has spent many years lecturing to different groups of people who were interested in spectrum analysis for problems ranging from detailed physical tests of cavitation phenomena to philosophical questions about why the walls of Jericho Fell. Often, a very simple explanation involving pulse theory has sufficed to explain some of the observed phenomena. This excerpt is designed to give the reader food for thought rather than quantitative answers.

An Introduction to Time Waveform Analysis

In recent years there has been a resurgence in the use of time waveform analysis techniques. Condition monitoring personnel have now come to realize some of the limitations of the FFT process. Since many find the time waveform analysis process difficult and confusing the technique is rarely used to its full potential. The key to the successful utilization of time waveform data is knowing when to use it. This paper examines the limitations of the FFT process and identifies specific applications where enhancing FFT information with time waveform analysis is appropriate.

The paper also details in practical terms how to set up, acquire and manipulate time waveform data. Having discussed the acquisition of the data the paper continues to discuss the interpretation of the data including the time-frequency relationship, symmetry, and pattern recognition of common faults.

Asset Condition Management

PDCA – Plan Do Check Act

You are taking vibration data on all of your critical assets and also all essential assets. Yet, you still feel overwhelmed and some assets are stretched beyond their data collection interval.

Meggitt Sensing Systems Debuts World’s Smallest Triaxial Isotron Accelerometer

Meggitt Sensing Systems, a Meggitt group division, has announced the new product launch of the Endevco model 35A, the world’s smallest ISOTRON (IEPE-type) triaxial accelerometer with integral electronics, designed for high-precision vibration measurements in three orthogonal axes on very small objects.

Commtest Awarded GSA Contract

Commtest has been awarded a 5 year United States General Services Administration (GSA) contract GS-07F-0471W and is now listed on GSA’s Schedule 66 under Special Identification Number (SIN) 602-30 as a Small Business entity.

VIBXPERT II, A New Portable Vibration Analyzer

With Full Color Display, Fast Data Acquisition and Powerful Vibration Diagnostic Tools

Confidently Diagnosing Misalignment With Vibration Analysis
Asset Condition Management

Confidently Diagnosing Misalignment With Vibration Analysis

Using brand new 3D animations, we will explore the physical motion associated with misalignment and explain why we see the characteristic vibration patterns that are common when machines are misaligned.

We will also discuss why misalignment is so often misdiagnosed. We will introduce phase analysis, and demonstrate how two channel analyzers make phase analysis very easy to perform, and how it helps us to accurately diagnose misalignment.

1) How does the vibration pattern change when machines are misaligned

2) How to accurately diagnose misalignment

3) Why phase analysis is such a useful tool

Belt Faults

Belt drives can cause many strange looking spectra. To analyze and troubleshoot belt drives it is imperative to have a high resolution analyzer. I use one with 3200 lines of FFT. To those still using 400 lines that might seem like overkill. This paper, though, will show the necessity of high resolution when troubleshooting many vibration problems.

Monitoring the Performance and Health of a Shredder Plant

In today’s difficult business conditions, it is more important than ever to know how your recycling plant is performing. It is also vital to avoid sudden expensive breakdowns, and to keep plant downtime to a minimum. This is particularly difficult in the scrap auto recycling industry, where all the machinery must be capable of handling large vehicles with a high throughput; the machinery takes a battering, and sooner or later it must be maintained or it will break down. While it is possible to build some redundancy into an operation – such as having spare scrap handling cranes – there is often only one shredding machine at the heart of an auto shredding plant. If the shredder is working well, then the plant is productive; and if the shredder is not working, then the plant is inoperative.

Azima DLI Ensures Reliability of Panama Canal Locks Using Advanced Vibration Monitoring Capabilities

Panama Canal Authority Utilizes Azima DLI’s DCX Vibration Data Collector and Diagnostic Software to Increase Uptime of Equipment Critical to Lock Movement

Azima DLI, the leader and premier provider of predictive machine condition monitoring and analysis services, today announced that its advanced vibration monitoring capabilities will be used by the Panama Canal Authority (ACP) to achieve important equipment reliability and uptime goals associated with the operation of its lock system. The ACP is the autonomous agency of the Government of Panama in charge of managing, operating and maintaining the Panama Canal.

Asset Condition Management

Inspection Beyond Vibration Pays Dividend

I would like to share with everyone an instance that came up with my partner and I during a time we were setting up a data base and rounds on critical machinery for monitoring at a large and

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