Experimental and analytical method for shaft system vibration of reciprocating equipment

Abstract

The invention discloses an experimental and analytical method for shaft system vibration of reciprocating equipment. The experimental and analytical method comprises the following steps that S1, a comparison characteristic database of a standard shaft system is established; S2, under the working rotating speed of a to-be-detected shaft system, a root-mean-square value kurtosis index X<RMS1>, a peak index B1 and a kurtosis index K1 are obtained; S3, the X<RMS1>, the B1 and the K1 which are obtained in the step S2 are compared with a root-mean-square value kurtosis index X<RMSs>, a peak index Bsand a kurtosis index Ks in the comparison characteristic database of the standard shaft system under the working rotating speed; S4, whether the to-be-detected shaft system is unbalanced in mass or not is analyzed; and S5, an equivalent model of the to-be-detected shaft system is established, and a shaft system vibration-reduction scheme is put forward. According to the experimental and analytical method for shaft system vibration of the reciprocating equipment, analyzing is conducted in the aspects of detecting means, signal processing and characteristic database establishing, and guidance is provided for unbalanced vibration excitation of a shaft system of the reciprocating equipment and detecting and analyzing of a resonance zone.

Description

technical field [0001] The invention relates to the technical field of shaft system vibration detection of reciprocating equipment. More specifically, the present invention relates to a vibration experiment and analysis method of a reciprocating equipment shaft system. Background technique [0002] The shafting vibration of reciprocating equipment is very complicated, and there are many influencing factors, such as unbalanced excitation force on the shafting, shafting resonance, and other factors. Shafting is the key moving part of reciprocating equipment. Severe shafting vibration will affect the performance of the equipment and even cause damage to parts. Shafting vibration includes not only the lateral vibration of the shaft, but also the torsional vibration of the shaft. For reciprocating equipment, its torsional vibration is more subtle and difficult to find, which often leads to fracture of couplings and shafts. Therefore, it is of great significance to analyze the ...

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Problems solved by technology

[0004] However, the shaft system of reciprocating equipment is more complex than that of centrifugal rotating equipment. At present, there are still some limitations when evaluating the state of the shaft system by collecting lateral vibration signals and torsional vibration signals

For example, the vibration signal measured at the 6 parts of the bearing includes the vibration information of the bearing, crankshaft, connecting rod, etc., and it is very difficult to extract the information of a certain part from it. Therefore, it is difficult to quantitatively analyze the influence of the vibration factors of the shaft system

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