A test device and method for the torsional vibration damping effect of a shaft system with a cascade structure

Abstract

The invention provides a shaft system torsional vibration damping effect testing device with a blade grid structure, and the device comprises a substrate. The substrate is provided with a rotating shaft supporting seat. One end of a rotating shaft is disposed on the rotating shaft supporting seat, and the other end of the rotating shaft is provided with a torsional vibration disturbance part. An air cylinder is disposed at the central part of the rotating shaft, and two sides of the air cylinder are respectively provided with a first inertia wheel disc and a second inertia wheel disc. The measurement module is disposed between the torsional vibration disturbance part and the air cylinder. The torsional vibration disturbance part comprises a disturbance part supporting seat disposed on the rotating shaft. A torque hand wheel is coaxially disposed at the front side of the torsional vibration disturbance part. The disturbance part supporting seat is provided with a clamping block. The measurement module comprises a sensor support and an extension block. The sensor support is disposed on the substrate, and is used for installing a current vortex displacement sensor. The extension block is coaxially disposed on the rotating shaft, and serves as the measurement reference of the current vortex displacement sensor. The invention also provides a shaft system torsional vibration damping effect testing method employing the blade grid structure, and the method can be used for the research of damping effects on shaft system torsional vibration from different blade structures and different fluid working conditions.

Description

technical field [0001] The invention relates to a steam turbine torsional vibration experiment system, in particular to a test device and method for the torsional vibration damping effect of a shaft system with a cascade structure. Background technique [0002] With the development of the electric power industry, the single unit capacity and power density of the steam turbine generator set are increasing, coupled with the large capacity, long distance and diversification of the power transmission network, the shafting is more prone to torsional vibration, which has a great impact on the steam turbine power generation. Fatigue damage or even damage to the unit, resulting in serious economic losses and even safety accidents. The torsional vibration of the shafting of the turbogenerator is different from the bending vibration of the shafting. It has strong concealment, mainly manifested in: even if the torsional vibration amplitude is large, it is rarely transmitted to the foun...

AI Technical Summary

Problems solved by technology

It can be seen that the damping coefficient has a great influence on the stability of torsional vibration. In stability analysis, it is more important than the modal shape and modal mass, but it is difficult to calculate and the accuracy is not high. The field test is to obtain the torsional vibration modal damping better way

[0003] At present, there is no similar experimental device with a cascade structure for studying the torsional vibration damping effect of the shafting in China.

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