A Method for Determining the Dynamic Characteristics of a Large Turbine Engine Base
A technology of steam turbine engine and dynamic characteristics, which is applied in elastic testing, testing of machine/structural components, instruments, etc., and can solve problems such as the impossibility of using prototypes, the large size and weight of the base of large turbogenerators, etc.
Active Publication Date: 2020-04-24
CHINA ELECTRIC POWER RES INST +1
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However, the size and weight of the base of the large turbo-generator is too large to adopt the prototype
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[0024] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.
[0025] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or over...
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The invention discloses a method for determining the dynamic characteristic of a large turbine engine base, the method comprising: making a base model based on a geometric similarity ratio of a base prototype and the base model; placing a load magnitude and position specified by a load distribution diagram on the base model based on the load distribution diagram of the base prototype and a similarity relation; placing test points on the base model; performing a vibration test and response prediction of a self-vibration characteristic on heavy operating condition of the base model; testing the dynamic stiffness of a structure disturbance force application point in the directions X, Y, and Z by using an origin excitation testing method; and establishing a modal model and verifying the correctness of an experimental result by using a modal model parameter. The method researches the dynamic characteristic of the turbine engine base by using a model test substitute prototype, and converts the result of a model test back to the prototype by a similarity ratio conversion relation so as to indirectly obtain the dynamic characteristic test result of the base prototype.
Description
technical field [0001] The invention relates to the technical field of power grid disaster mitigation, and more particularly, relates to a method for determining the dynamic characteristics of a large steam turbine engine base. Background technique [0002] The base of the large turbogenerator is a reinforced concrete frame structure, and its main function is to provide support and accommodation space for the turbogenerator and its auxiliary components. Since the turbogenerator body generates dynamic loads on the base during operation, the base is subjected to long-term forced vibration excitation during service, so the dynamic characteristics of the base body are directly related to the safe and stable operation of large turbogenerators. [0003] During the operation of the turbogenerator, it must meet the requirements of relevant national and international standards, such as the requirements of "Code for Design of Power Machine Foundation" (GB50040-96), the international s...
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IPC IPC(8): G01M5/00
CPCG01M5/0066
Inventor 张谦卢智成孙宇晗钟珉孟宪政林森刘振林朱祝兵韩嵘
Owner CHINA ELECTRIC POWER RES INST