Centrifugal impeller optimal design method for preventing vibration localization for happening

Abstract

The invention relates to a centrifugal impeller optimal design method for preventing vibration localization from happening. The method comprises the following steps of: 1, carrying out static strength verification; 2, drawing a vibration mode graph of a plurality of orders of modals in front of an impeller; 3, analyzing a forbidden band and a passband of the impeller; 4, determining the excitation frequency of an excitation source; 5, judging whether the excitation source drops in the forbidden band or is close to the forbidden band; and 6, optimizing the impeller structure and increasing the isolation margin of the forbidden band of the impeller so as to eliminate influence of detuning. According to the centrifugal impeller optimal design method disclosed by the invention, the vibration localization problem of the impeller in the operation process can be effectively solved, the injuries caused by vibration localization and the failure occurrence rate of the impeller in the operation process are reduced, and a centrifugal impeller unit can be ensured to operate safely and reliably for a long time.

Description

technical field [0001] The invention relates to the field of impeller machinery vibration analysis and impeller machinery optimization design, in particular to a centrifugal impeller optimization design method for avoiding vibration localization. Background technique [0002] As an important equipment in metallurgy, building materials, electric power, petroleum, chemical industry, environmental engineering and other industrial sectors, centrifugal compressors are widely used and play a pivotal role in many fields of national economy. For a long time, the vibration problem of large and high-speed centrifugal impellers has always affected the safe and reliable operation of the fan. Once a problem occurs during operation, the production will be interrupted at least, causing economic losses; at worst, it will cause equipment scrapping or even casualties. In recent years, with the rapid development of the national economy and the continuous improvement of unit performance, centri...

AI Technical Summary

Problems solved by technology

For a long time, the vibration problem of large-scale and high-speed centrifugal impeller has always affected the safe and reliable operation of the fan. Once a problem occurs during operation, the production will be interrupted, causing economic losses;

In addition, due to manufacturing errors in the welding process, the characteristics of the cyclically symmetrical structure of the impeller are often destroyed, resulting in structural detuning, resulting in localized vibration of the impeller, resulting in greater dynamic stress in certain parts, which in turn leads to impeller Accidents caused by vibration fatigue damage

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