Vibration Diagnostics of Power Equipment Before Commissioning

Abstract

<jats:p>The article describes how to use vibration diagnostics to detect defects in the installation of new equipment and to determine the quality of repairs based on vibroacoustic characteristics. Especially relevant is the vibration diagnostics of rolling bearings before installation on the mechanism. If there are errors in the calculations of the magnetic system of synchronous generators, vibration occurs, which is not eliminated during operation. Design errors, poor assembly of pumping units, asynchronous motors, power transformers cause increased vibration, which leads to damage to the specified equipment. The main reasons causing the vibration of the transformer tank are considered and the frequency range from 50 to 6000 Hz is determined on which these defects can occur. Full-scale experiments of the vibration of the transformer tank have shown that certain defects can occur in a narrow frequency band. The practical application vibration diagnostics of the pump unit describes in this article. Technical diagnosis of pumping units of the sewer station was carried out for various included composition. The results obtained made it possible to exclude reverse hydraulic impacts as a possible cause of the failure of the pump unit.</jats:p>

Experimental Study Results Processing Method for the Marine Diesel Engines Vibration Activity Caused by the Cylinder-Piston Group Operations

“…One of the indicators that helps to assess the technical condition of a marine diesel engine is the level and nature of changes in its vibration [11,12]. Any deviations from normal operating conditions in marine diesel units are reflected in their vibration characteristics [13,14], which can be used to diagnose the condition of parts of a cylinder-piston group using on-site methods based on vibration indicators [15,16]. Previous studies on engine vibration have estimated the relative significance of different sources of sound vibration, indicating that piston impacts during shifting are among the most significant sources [13].…”