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Turbine blade vibration test method and device

A steam turbine blade and vibration test technology, applied in the field of steam turbine blades, can solve the problems of lack of theoretical guidance in blade design, stay in empirical design, and unclear vibration mechanism of damping blades, etc., and achieve the effect of reasonable test method and device design

Active Publication Date: 2008-02-13
DONGFANG TURBINE CO LTD +1
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AI Technical Summary

Problems solved by technology

However, the vibration mechanism of the damping blade is still unclear, and the design of the blade lacks theoretical guidance and is still in the empirical design stage.

Method used

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  • Turbine blade vibration test method and device
  • Turbine blade vibration test method and device
  • Turbine blade vibration test method and device

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Embodiment Construction

[0060] Before explaining the present invention, it is necessary to introduce the types of blade damping structures for better understanding of the present invention.

[0061]The blades have crowns. After the blades are assembled in the rotor, the crowns of all the blades are in contact with each other to form a ring called a shroud. When the rotor is running, the blades will torsion and vibrate, the adjacent blade shrouds will be displaced relative to each other, and the contact surface will slide. On the one hand, it will adapt to the blade torsion; on the other hand, it will generate damping and reduce vibration. In addition, the lacing boss located at the waist of the blade is similar to the shroud structure and can also produce damping, but because it is located at the waist of the blade, the linear speed is low during operation, and the damping produced is very small. Usually, only its supporting effect is considered, and its damping is not considered. Effect. The dampin...

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Abstract

The invention discloses a steam turbine blade vibration test method and device. The method steps are that firstly, a blade force vibration status is analyzed and a blade excitation force mathematical model is built. Secondly, an excitation force is imposed on the blade by a vibration source. The frequency of the excitation force is regulated until resonance is generated between the blade and the vibration source. Vibration characteristics parameters values of the blade under the excitation force are measured. Thirdly, blade damping characteristics parameters, including modal damping ratio, damper contact stiffness and blade dynamic stress, are worked out according to the vibration characteristics parameters values. The device includes a test bed, a blade clamping mechanism arranged on the test bed, an excitation generator, a vibration parameter detector and a data processing system. The excitation vibration generator is fixed on the test bed. The excitation vibration head of the excitation vibration generator is fixed with the blade. Corresponding to the blade, the vibration parameter detector transforms the vibration signals of the blade into electric signals, which are input into the data processing system. The invention proves the vibration mechanism of the damping blade. A calculation model of the damping blade is constructed through the test parameters. Experience design is terminated. The blade design is standardized to step into a scientific design orbit.

Description

technical field [0001] The invention relates to a steam turbine blade, in particular to a method and a device for testing the vibration characteristics of the blade. Background technique [0002] The steam turbine is the key equipment for converting the thermal energy of water vapor into mechanical energy in thermal power plants and nuclear power plants, and the blade is an important part of the steam turbine. During the operation of the steam turbine, the blades are not only subjected to huge centrifugal force, steady-state airflow force, but also unsteady-state airflow force. The working environment is extremely harsh, and blade accidents occur frequently. Vibration fatigue is one of the main reasons for blade accidents. It is the current trend in the design of steam turbine blades to adopt a suitable damping structure to reduce the vibration stress of the blade, thereby improving its safety. [0003] When designing a steam turbine blade with a damping structure, the natu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M7/02
CPCG01M5/0016G01M5/0066
Inventor 何东谢永慧卢中俊王建录梁小兵徐荣冬何斌张荻
Owner DONGFANG TURBINE CO LTD
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