Impeller optimization design method for preventing targeted energy transfer phenomenon during vibration of impeller

Abstract

The invention discloses an impeller optimization design method for preventing a targeted energy transfer phenomenon during vibration of an impeller. On the basis of traditional static strength analysis and design, dynamic characteristics of the impeller under the detuned ideal condition are analyzed, the forbidden band and the pass band of the impeller are recognized, then all frequency components of an excitation source borne by the impeller are listed, whether the frequency components fall into the forbidden band is judged, an impeller mechanism is required to be amended and optimized under the condition that the frequency components fall into the forbidden band, and thus the targeted energy migration phenomenon is prevented during vibration of the impeller. The method has the guiding significance in design and manufacturing of a new generation of centrifugal impellers, the problem of local large-amplitude vibration in the running process of the impeller can be effectively solved, damage caused by vibration can be reduced, and the failure rate in the running process of the impeller can be reduced, so that a centrifugal impeller unit can run safely and reliably for a long time. The safety and the high efficiency of the impeller designed with the method can be improved to a large extent.

Description

technical field [0001] The invention belongs to the technical field of impeller machinery vibration analysis and impeller machinery optimization design, and relates to how to analyze the targeted transfer of energy occurring in the vibration of a centrifugal impeller and how to optimize the design of the centrifugal impeller. A method for optimal design of impellers where energy transfer phenomena occur. 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 equip...

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;

[0003] The practice of the development of industrial technology has proved that the traditional static strength design and empirical design methods are far from meeting the needs of the development of modern engineering technology, and cannot guarantee the safety and reliability of rotating parts such as impellers.

Due to the development of centrifugal compressors in the direction of large-scale, the size of the impeller continues to increase, which will inevitably lead to the weakening of the overall structural rigidity of the impeller, which will inevitably aggravate the vibration of the impeller

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 a large local vibration of the impeller, resulting in greater dynamic stress in some parts, which in turn leads to impeller Accidents caused by vibration fatigue damage

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