EVALUATION OF THE METHODOLOGICAL ERRORS OF MEASURING THE GENERAL VIBRATION LEVEL BASED ON THE IMAGE BLUR ANALYSIS OF A ROUND BAR

Abstract

Background. A vibration signal generated or transformed by an object, both natural and man-made, carries a large amount of information about the state and properties of this object. This circumstance can be of great help in ensuring the safety of our lives in other areas, but subject to the correct extraction and interpretation of this information. The imperfection of currently used methods for measuring vibration parameters is an obstacle to achieving this goal. This obstacle is proposed to be overcome by introducing a new methodology for measuring vibration parameters. Materials and methods. The essence of the proposed methodology lies in the fact that instead of a sequence of time-spaced instantaneous values of the measured vibration parameter or a complex functional composed of the values of several such parameters, an image of a round mark applied to the surface of the test object is analyzed. The recording device forms a series of images of a round mark, both with and without vibration blur. The intensity of the vibrational process is judged based on the analysis of a series of relative vibrational increments of the image area of a round mark with vibrational blur. Results and conclusions. The principle of vibration signal intensity estimation is stated. A family of curves is presented, reflecting the reduced methodological error of measuring the intensity of vibration based on the analysis of the vibrational increment of the area of the image of a round mark. A numerical example of determining the limiting absolute methodological error of such a measurement is considered. The indicators of the measurement method presented in the article are compared with those of the contact vibrometer BALTECH VP-3470-Ex.

Keywords

• vibration
• measurement
• image
• round mark
• blur
• vibration displacement
• vibration increment
• image area
• pixel