Single-side diagram balance method of pure test mass Nyquist diagram of rotary machine starting and parking

Abstract

The invention discloses a single-side diagram balance method of a pure test mass Nyquist diagram of rotary machine starting and parking. The method comprises the following steps that (1), original key phase signals and original vibration signals of rotary machine starting and parking are collected; (2), time data of the peak points of the original key phase signals are obtained, and rotary frequency information of the original vibration signals can be obtained through the time interval of the peak points of the key phase signals, namely the time interval of the vibration signals; (3), fractional Fourier transform filtering is carried out on the original vibration signals, and a single original rotary frequency vibration signal is obtained by combination with the step (2); (4), a Nyquist diagram of the original rotary frequency vibration signal obtained in the step (3) is calculated; (5), test mass is added on a balance disk from the step (1) to step (4), and a Nyquist diagram of a test mass starting and parking rotary frequency vibration signal is obtained; (6), the pure test mass Nyquist diagram is obtained due to vector subtraction between the test mass Nyquist diagram and the original nyquist diagram; (7), by means of the pure test mass Nyquist diagram and the original Nyquist diagram, the unbalance amount of a rotary machine rotor is obtained according to a dynamic balance method.

Description

【Technical field】 [0001] The invention belongs to the field of dynamic balance of rotating machinery rotors, and in particular relates to a single-sided graphical balancing method of a pure test weight Nyquist diagram of a rotating machinery starting and stopping. 【Background technique】 [0002] As a key and basic technology of rotating machinery, dynamic balancing technology has been closely watched and valued by industry and academia. A large number of statistical data show that the unbalance of the rotor is usually the main cause of the vibration of the rotating machine. Unbalance will cause the deflection of the rotor and the change of internal stress, which will aggravate the vibration of the machine, reduce the working efficiency of the machine, and cause various accidents in severe cases; unbalance is not only the main excitation source of rotating machinery, but also the source of many kinds of vibration. Inducing factors of self-excited vibration. Once the balance...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of insufficient utilization of the vibration information of the rotating machinery in the prior art, and to provide a single-sided graphical balancing method of the pure trial weight Nyquist diagram of the rotating machine starting and stopping. The Quest diagram and the Nyquist diagram of the start-stop process of the rotor to be balanced can be used to obtain the imbalance or counterweight of the rotor to be balanced by a graphical method

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