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Experimental apparatus and method for vibration characteristic of turbine moving blade

An experimental device, a technology of vibration characteristics, applied in measurement devices, vibration testing, and testing of machine/structural components, etc., can solve the problems of high cost, unrealistic teaching experiments, and complicated detection of turbine rotor blades.

Inactive Publication Date: 2014-02-26
SOUTHEAST UNIV
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Problems solved by technology

Therefore, detecting the dynamic frequency of steam turbine moving blades is a very complicated technology, and the cost is very high, and teaching experiments cannot be realized

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  • Experimental apparatus and method for vibration characteristic of turbine moving blade

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Embodiment Construction

[0029] Refer below figure 1 , to specifically describe the specific embodiments of the present invention.

[0030] An experimental device and method for the vibration characteristics of a steam turbine blade, the device includes a strip-shaped elastic body for simulating the blade, an iron stand for fixing the strip-shaped elastic body to simulate the mechanical model of a cantilever beam, a centrifugal force simulator with adjustable force, Frequency adjustable blade vibration exciter, acceleration vibration sensor and NI data collector, etc.

[0031] When studying the vibration of steam turbine blades, the blades are regarded as elastic cantilever beams with continuous mass distribution. Therefore, this device fixes the strip elastic body on the upper end of the iron frame (it can be realized by bolts or welding), so as to construct the vibration of the blades. Cantilever beam model.

[0032] When measuring the natural frequency of the strip elastic body and observing its ...

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Abstract

The invention discloses an experimental apparatus and method for the vibration characteristic of a turbine moving blade. The experimental apparatus comprises a bar-type elastic body and a first stand, a first magnet, an electromagnet, an alternating current signal generator and a switch, a second stand, a second magnet and a third magnet, a vibration parameter acquisition device of the bar-type elastic body and a frequency spectrum measuring device; a head end of the bar-type elastic body is connected at the upper part of the first stand; the first magnet is connected to the bar-type elastic body; a coil on the electromagnet is connected with the alternating current signal generator via the switch; the electromagnet is correspondingly arranged under the first magnet; the third magnet is connected at the upper part of the second stand; the second magnet is connected with the tail end of the bar-type elastic body; the tail end of the bar-type elastic body points to the third magnet; the vibration parameter acquisition device of the bar-type elastic body acquires the vibration parameters of the bar-type elastic body, and further transmits the acquired vibration parameters to the frequency spectrum measuring device; and the sum of the weights of the first magnet and the second magnet is less than a force which deforms the bar-type elastic body. The bar-type elastic body is used for simulating the vibration of the turbine blade.

Description

technical field [0001] The invention relates to an experimental device and method for simulating the influence of rotating centrifugal force on the natural frequency and mode shape of the vibration of steam turbine blades, belonging to the technical field of impeller rotating machinery vibration. technical background [0002] Steam turbine moving blades are an important part of a steam turbine, and undertake the important task of converting the thermal energy and flow kinetic energy of steam into the output of the rotational mechanical energy of the steam turbine rotor. During the working process of the steam turbine, the periodic excitation of the steam flow causes the blade to produce forced vibration. When the excitation frequency of the steam flow is equal to the natural frequency of the natural vibration of the blade, resonance is caused, the amplitude increases sharply, and the alternating stress increases sharply. The stress exceeds the allowable vibration resistance ...

Claims

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Application Information

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IPC IPC(8): G01M7/02
Inventor 杨建明谢资华李季张东兴刘志华
Owner SOUTHEAST UNIV
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