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Vibration Analysis and monitoring can save you many thousands of dollars by predicting machine bearing failure and allowing corrective machinery maintenance to be done before a disaster occurs. Vibration baselines for every machine on the factory floor can be established then during routine factory maintenance spot checks of machinery will highlight possible developing problems. Purchase vibration test equipment, shaft alignment and monitoring equipment, vibration analyzers, switches and full on the spot vibration analysis service from VIBES Corp.

 

Understanding and analyzing Vibration as it occurs in machinery is a complex but beneficial undertaking that can save untold thousands of dollars in predictive machinery maintenance. Vibration analysis is composed of three components, Acceleration, Velocity and Displacement that work in relation to each other. For example, if you were to strike a steel plate on the flat with a hammer the plate will respond with an instantaneous change or deflection in the opposite direction of the blow. This Unit of "vibration" is called acceleration, which is proportional to the force. The Plate will deflect to a certain point, stop, and then return in the opposite direction. The amount of distance traveled in one second is the "Velocity". Velocity, usually read as velocity peak, can be related to a measure of fatigue. If the plate moves .01 inch in one second then the table is said to move .01 inch per second. The last measurement of deflection will be when the plate returns going past the center and continuing until it stops at some point. The measurement of this total movement or cycle is called displacement. Displacement is usually cyclic in nature and will continue until all the energy has dissipated. The time or length and amplitude or strength of the cycle depends on the amount of natural of dampening in the system. There are as always many factors to consider and so experience in interpreting the various analysis and instrument readouts plays a prime roll in making any determination as to a machines condition however the study and analysis of these basic three factors as can be measured in operating machinery is the key to controlling and eliminating costly machine downtime.

Vibration Analysis can save Thousands in maintenance costs

 

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The main tasks for condition diagnostics, both functionally without any changes in machine operation mode and in testing under the influence of external controlled vibration exciters, also can be divided into three main groups. This division is based on the method used for determining diagnostics standards. These standards are used for defect detection, identification, and development prediction.

The first group uses standards based on a group of consecutive measurements of diagnostic signals for each machine (history based standard). These methods were traditionally used in condition monitoring systems and the main type of vibration signal analysis was narrow band spectrum analysis.

The second group of tasks used the standards formed by single vibration measurements conducted on a group of identical machines’ units (set based standard). These tasks are typical for the final output control at repair or production shops. A number of signal analysis techniques can be applied in this connection, but the most powerful method is similar to the previous case using spectrum analysis of the vibration signal.

The third group contains the tasks with the most complex solutions for development, but are most efficient in practical diagnostics with prior known standards. Thus condition diagnostics can be done using a single vibration measurement. Typically, the solution of most complicated problems is based on the analysis of signal modulation processes, for example, using the spectrum analysis of low frequency oscillations of high frequency signal power, including vibration excited by periodic shock pulses. In this case the standard of the defect free state is most typically considered the absence of certain features in the analyzed signal.

The new generation of condition monitoring and diagnostics systems reliably detect, not only potentially dangerous defects of any of above groups at the initial stage of their development, but also identify the exact defect type and its severity. Only in this case and, taking into account prior known development rates for each of defect types, is it possible to provide long term condition prediction and residual service life of the machine or its unit. This task is considered to be the main one for the new generation of the condition monitoring and diagnostics systems.

Shaft alignment is a technical skill that is not common in the construction and maintenance professions, but categorized more like a specialty. It requires unique and expensive measurement instruments, some calculation capability, and relies heavily on experience for successful results on heavy, high-speed, or high-temperature machines. At present there are no universally accepted standards that define good results. This paper covers alignment standard for Four-dial indicator method. All these standards are developed only on experience basic which are useful for alignments in Thermal Power Station’s Coal Handling Plants. The goal of these standards is to provide the technician with the recommended approach for the quality alignment.