Energy-feedback type shaft system torsional vibration testing system

Abstract

The invention relates to an energy-feedback type shaft system torsional vibration testing system. The energy-feedback type shaft system torsional vibration testing system comprises a frequency converter, a variable-frequency and variable-speed motor controlled by the frequency converter, a double-fed motor linked with the variable-frequency and variable-speed motor, a rotor-side converter and a grid-side converter which connect the double-fed motor to a power grid, a torsional vibration signal collecting assembly and a torsional vibration monitoring and testing system connected with the torsional vibration signal collecting assembly, wherein a plurality of linkage mechanisms to be tested are connected between the variable-frequency and variable-speed motor and the double-fed motor, the torsional vibration signal collecting assembly is used for detecting torsional vibration information of the linkage mechanisms to be tested, and the torsional vibration monitoring and testing system is used for receiving and displaying the torsional vibration information. The energy-feedback type shaft system torsional vibration testing system has an effect of testing the torsional vibration of various excitation factors of various linkage mechanisms in various environments.

Description

technical field [0001] The invention relates to the field of shafting torsional vibration, in particular to an energy-feeding type shafting torsional vibration testing system. Background technique [0002] The torsional vibration of the shafting of rotating machinery (hereinafter referred to as torsional vibration) is a ubiquitous and seriously harmful problem. During the rotation process at the average speed, there will be fluctuations in the instantaneous speed of different sizes and different phases between the various elastic components due to various reasons, forming a back and forth twist in the direction of rotation. Vividly, it can be considered that, due to the action of inertia, a reaction force in the opposite direction with an opposite change trend is generated between the elastic parts of the rotating machine, thus forming a similar force on the elastic parts like a twisted twist. Obviously this torsional vibration will cause tangential alternating torsional st...

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Problems solved by technology

[0005] (2) Latency: The torsional vibration of the shaft system is mostly a short-term process caused by various disturbances (of course, there are also continuous forced oscillations caused by continuous disturbances, such as subsynchronous oscillations of turbogenerators, due to unbalanced three-phase loads The torsional vibration of twice the grid frequency caused by the negative sequence current formed, etc.), without a special torsional vibration monitor, it is generally impossible to find

It is difficult to detect the "dark injury"

In addition, torsional vibration tends to cause other forms of vibration, which will even mask its existence and cause misjudgment

[0006] (3) Sudden nature of the accident: As long as the fatigue accumulation caused by torsional vibration increases again and again, forming cracks, incisions, and gradually spreading, the shafting will break and collapse one day

[0007] (4) Severity of the accident: After an accident breaks out, its consequences are often devastating and vicious accidents, and the losses are extremely heavy

Even if damage has been caused, it is difficult to find out whether torsional vibration has occurred during long-term operation and how it has accumulated. This is also an important reason why various research results of torsional vibration are difficult to be understood and promoted.

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