Smoothing Technique Impact on Trends Retard

Trends are used in machinery condition monitoring for its vibration analysis. The trend means change of vibration parameter variation in time.

There are two criteria for assessing the machinery condition in hazardous industry according to GOST R 53563-2009:

• Absolute parameter creation (vibration velocity, vibration acceleration and vibration displacement);
• Growth rate of the parameters per hour creation.

The machinery condition is assed according to any of the parameters with the worst condition.

The vibration measured by the sensor located on the housing of the diagnosing machinery has irregular shape. The shape consists of the useful and noise components. When the machinery is in unsteady mode the noise components prevail in vibration signal. This contributes to the increase of vibration parameters values. So the threshold values are exceeded accidentally.

As a result the task of trends processing appears for the minimization of noise impact on trend change assessment.

In order to analyze the impact of smoothing technique the article considers the vibration displacement of the front bearing of the ventilator in intermittent mode.

Kostyukov A.V., Boychenko S.N., Kondratenko E.V. Smoothing Technique Impact on Trends Retard // Devices and techniques for measuring, quality control and diagnostics in industry and transport: refer to. 2nd All-Russian scientific and technology conference with international participation. - Omsk: OSTU, 2013. - P. 122-126

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