Experimental testing method and device for torsional vibration of a rotating shaft

Abstract

The invention belongs to the technical field related to large-scale rotating machinery, and discloses an experimental testing method and device for torsional vibration of a rotating shaft. The sum of the cross-sectional areas of the plurality of rotating shafts is the same as the cross-sectional area of ​​the rotating shaft to be tested, and the plurality of rotating shafts are fixed on the experimental platform for torsional vibration test. In this application, the design that the rotating shaft is equivalent to multiple rotating shafts can effectively adjust the moment of inertia of the rotating shaft, and avoid the problem that the torsional stiffness of the rotating shaft in the traditional torsional vibration experiment platform is too large, which makes it difficult to generate torsional vibration of the shaft system. , bending-torsion combination, and coupled vibration of blade bending and shafting torsion are of great value.

Description

technical field [0001] The invention belongs to the technical field related to large-scale rotating machinery, and more specifically relates to an experimental testing method and device for torsional vibration of a rotating shaft. Background technique [0002] The rotor system is widely used in rotating machinery such as steam turbines, gas turbines, and wind turbines, and is the core component of the transmitter equipment system. With the development of the current power generation industry, the unit is developing towards large-scale and high-parameters, and the shaft of the unit has become relatively slender. At the same time, large-scale power grids often use series compensation design to improve the power transmission capacity. The large-scale grid connection of new energy sources such as thermal power stations will cause torsional vibrations in the shafting of the unit, which will seriously affect the work of the impeller and blades, and problems such as friction will o...

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Problems solved by technology

[0003] Because the shafting of the existing rotor system generally has a larger diameter in order to resist the bending moment of the impeller and blades, and it is very difficult to measure the torsional vibration of the larger shafting with the existing experimental equipment, the complete shafting is often decomposed into The equivalent measurement is carried out by the shaft system connected by the coupling, so it is difficult for this experimental equipment to generate real torsional vibration, but the torsional motion generated by the coupling between the shafts, it is difficult to truly detect the torsional vibration of the shaft system, Furthermore, the influence of torsional vibration on blades, impellers, etc. cannot be known

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