Proper shaft alignment of rotating machinery is very important part of safety operation. Shaft misalignment through couplings often leads to severe machinery problems, such as overload of bearings, high casing temperatures at or near the bearings, excessive amount of oil leakage, higher than normal energy consumption, excessive coupling abrasion. Experimental studies were performed on a test apparatus to determine the relationships between the types of couplings (rigid, flexible and Oldham) and the RMS of vibration velocity. The
The article discusses the evaluation of an insufficiently functioning soy extruder located in a forage mixing unit using vibration diagnostic method. In the machine the bearings had to be replaced after a short period of time, the axle of the extruder broke regularly sometimes even within few days. These problems persisted even if the operating personnel properly observed the operating instructions and the equipments were working in nominal load.The authors give a short discussion about the theoretical background and present role of technical diagnostics, including vibration diagnostics. They present the equipments used, grouped by their structural and operating principles. The authors present the results obtained from a purposefully selected and organized data, evaluate them through spectrums and spectrum series, and collate them with acoustic experiences and images. They identify the connections between the various symptoms and their documented indicators. All of these provide the basic information for the necessary construction changes and determine the main line of conduct.
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