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Damping-structure-optimized blade testing experiment table and experimental method thereof

A technology of damping structure and testing experiment, which is applied in the field of experimental devices, can solve problems such as huge centrifugal force, and achieve the effect of ensuring the optimization accuracy

Active Publication Date: 2015-04-29
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Adopting the traditional damping shroud structure will lead to huge centrifugal force, and the Dorakin damping structure has become the main trend in the development of longer blades

Method used

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  • Damping-structure-optimized blade testing experiment table and experimental method thereof
  • Damping-structure-optimized blade testing experiment table and experimental method thereof
  • Damping-structure-optimized blade testing experiment table and experimental method thereof

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Experimental program
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Embodiment Construction

[0039] The present invention will be further described below in conjunction with the accompanying drawings.

[0040] see figure 1 and figure 2 , the present invention aims to test the damping structure optimization performance of steam turbine damping blades. Based on this purpose, a set of damping structure optimization consisting of a base platform, a blade root fixing device, a damping structure device, an excitation loading device and a measuring device is designed. Blade test bench.

[0041] see image 3 , firstly, the basic bench for the test is introduced. The test bench is composed of a bottom plate 1 and two side plates 2 welded thereon, and two pads 3 are welded on the side plates for fastening the blade root fixing device. The bottom plate 1 is placed on the foundation platform, the upper surface of the blade root groove 8 is closely attached to the lower surface of the pad 3, and the three-dimensional laser vibrometer bracket is fixed on the bottom plate 1 by ...

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Abstract

The invention discloses a damping-structure-optimized blade testing experiment table and an experimental method thereof. The testing experiment table comprises a base rack, a blade root fixing device, a damping structure device and a shock excitation loading device. The experimental method comprises the following steps: (1) sequentially mounting the blade root fixing device, a to-be-tested blade, the damping structure device, the shock excitation loading device, a three-dimensional laser vibration measurement instrument and a connection data acquiring device; (2) regulating the position of a loading nut, and regulating positive pressure and the like between a friction damping block and a ball disc; (3) starting a data acquiring device and a vibration exciter, starting the three-dimensional laser vibration measurement instrument, meanwhile recording the mode of the ball disc, a friction damping positive pressure, a damping structure applying height, a vibration exciting rod height and an exciting force; (4) changing a parameter set in the step (2); (5) analyzing influences of the friction damping positive pressure, the damping structure applying height, the vibration exciting rod height, the exciting force and a friction structure contact surface on a vibration characteristic of the blade, and drawing a corresponding curve.

Description

technical field [0001] The invention relates to the technical field of experimental devices, in particular to a damping structure optimization blade test bench and an experimental method for a steam turbine blade with a damping structure in an actual operating state. Background technique [0002] Blades undertake the important task of converting steam heat energy into mechanical energy in steam turbines, and are one of the most important components in steam turbines. The number of blades in a large steam turbine is often as many as several thousand, and it is subjected to the joint action of centrifugal force, steady-state airflow force and unsteady-state airflow force during operation. In addition, when the steam turbine works under various non-design conditions, it also has to bear the alternating stress caused by the load change and the large air flow excitation force under the small volume condition. The above various loads make the working environment of the blade extr...

Claims

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Application Information

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IPC IPC(8): G01M7/02
Inventor 谢永慧袁瑞山张哲源张荻
Owner XI AN JIAOTONG UNIV
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