A Frequency Modulation Method for Large Structural Components Based on Bottom Load Allocation

Abstract

The invention belongs to the field of large-scale structural component frequency adjustment technology, particularly relates to a large-scale structural component frequency adjustment method based on bottom load distribution and aims to solve the problem of structural resonance of a large-scale structural body. The method is an inherent frequency adjustment method, original design does not need to be changed, and operation is simple. According to the large-scale structural component frequency adjustment method based on bottom load distribution, inherent frequency is adjusted by adjusting a stepped load-carrying gasket to change bottom load distribution, the inherent frequency adjustment range is large, the frequency adjustment range reaches 6% of initial inherent frequency according to an inherent frequency adjustment instance of a certain large-scale generator, and therefore the method has high engineering practical value. According to the method, bottom load distribution is adjusted by use of dead weight of a large-scale structural component, the original structural design of the large-scale structural component is not changed, and therefore the method is simple and easy to implement; bottom load change is realized by adjusting the gasket, therefore, economical efficiency is good, dimensional precision is high, control is easy, and engineering requirements can be met.

Description

technical field [0001] The invention belongs to the technical field of frequency modulation of large structural parts, and in particular relates to a method for frequency modulation of large structural parts based on bottom load distribution. Background technique [0002] For large rotating equipment represented by generator sets, the capacity of a single unit is increasing day by day, and the problem of vibration control is crucial to its operation safety and reliability. The external structure of a typical generator body is as follows: figure 1 As shown, includes spacers, foot support ribs, foot support and hydrogen cooler. When the natural frequency of the generator body structure is close to its operating frequency, structural resonance will be induced, resulting in excessive vibration and threatening the operation safety of the generator set. At the same time, the casing is subject to resonance stress for a long time, which is prone to fatigue failure and must be contr...

AI Technical Summary

Problems solved by technology

However, for large-scale generator sets, due to its huge casing, it usually requires a large adjustment of the structure in order to change the natural frequency of the generator body structure, which is not feasible for the equipment that has been put into production on site.

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