Acoustic Vibration Tests

Acoustic Vibration Tests

Bearing devices are common in domestic and industrial applications. The proper operation of these devices largely depends on the smooth and quiet operation of the bearings. In industrial applications, these bearings are considered critical mechanical components and a defect in the bearing, if not detected in a timely manner, will cause failure and may even result in machine downtime. Failures in bearings can occur during use or during the manufacturing process. The detection of these defects is therefore important for condition monitoring and quality inspection of bearings.

Acoustic Vibration Tests

Different methods are used to detect bearing faults. These methods are generally vibration and acoustic measurements, temperature measurements and wear residue analysis. Among these, acoustic vibration measurements are the most widely used. Various techniques such as vibration measurements in time and frequency domains, sound measurements, shock pulse method, sound pressure and sound intensity techniques, and acoustic emission method are applied to measure vibration and acoustic responses caused by defective bearings.

Bearings act as a source of vibration and noise due to changing compatibility or the presence of defects in them. Bearings with radially loaded rolling elements generate vibration even if they are geometrically perfect. This is because a limited number of rolling elements are used to carry the load. The number of rolling elements and their position in the load zone change with bearing rotation, resulting in a periodic variation in the overall stiffness of the bearing assembly. This variation in hardness produces vibrations commonly known as variable conformation vibrations. The varying direction of the contact forces exerted by the rolling elements can cause the bearings to vibrate in tilt or ring mode, even if they are geometrically perfect.

However, the presence of a defect causes a significant increase in vibration level. Bearing defects are grouped either distributed or locally. Distributed defects include surface roughness, waviness, misaligned slots, and out-of-size rolling elements. Distributed defects are caused by manufacturing defect, improper installation, or abrasive wear. The change in contact force between the rolling elements and the raceways due to distributed imperfections results in an increased level of vibration.results in yes.

Our organization also provides acoustic vibration testing services with its trained and expert staff and advanced technological equipment, among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors.

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