Method for testing and identifying dynamic characteristic coefficients of seals
An identification method and technology of dynamic characteristics, which are applied in the field of test identification of dynamic characteristic coefficients of turbine mechanical seals, and can solve problems such as affecting test identification accuracy and error identification results.
Inactive Publication Date: 2010-08-11
SOUTHEAST UNIV
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The above three problems directly affect the recognition accuracy of the test, and even lead to errors in the recognition results
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[0074] Basic train of thought of the present invention is:
[0075] (1) Sealed dynamic characteristic test bench, such as figure 1 , 2 , including: test bench foundation, rotor system, speed control system, lubrication system, vibration excitation device, cylinder and its restraint device, intake and exhaust system, signal acquisition and analysis system.
[0076] (2) Air force equivalent method. When the cylinder is deflected, the air flow force in each group of air seals is different in magnitude and direction, but it can be decomposed into two end faces according to the principle of force and force couple balance. Such as image 3 , after synthesizing the respective component forces on the two end faces, two resultant forces are obtained. The influence of these two resultant forces on the cylinder is equivalent to the airflow force in the multiple seals.
[0077] (3) Air flow identification method. Through the method of multi-point excitation and multi-point response, ...
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The invention discloses a method for testing and identifying dynamic characteristic coefficients of seals. In the method, the influence of an airflow force is reflected by the change of cylinder vibration so that the influence of the dynamic characteristic change of a bearing before and after air inflection on identification results is avoided; and problems such as cylinder deflection and vibration coupling in a vertical / horizontal direction are taken into full consideration. The method comprises the following steps of: equivalently resolving the airflow force to two end surfaces of a cylinder on a test bed based on a principle of balance of force and couples; exciting vibration in the vertical and horizontal directions on the two end surfaces respectively to obtain influence coefficient matrix of the cylinder under the working condition, measuring relative vibration changes of the two end surfaces of the cylinder after the air inflation by using an air inflation test and then calculating the size of the airflow force; and measuring the relative vibration of a cross section where optional groups of seals exist in the cylinder by using a vortex flow transducer arranged on the cylinder. Due to the same size of seal structures of the test-bed and basically the same pressure drop, the dynamic characteristic coefficients of each group of seals can be regarded as the same, thus, the dynamic characteristic coefficients of the seals can be calculated.
Description
technical field [0001] The invention relates to a test identification method for the dynamic characteristic coefficient of a turbomechanical seal, which can provide test data for the design of a large-scale rotary mechanical seal. Background technique [0002] With the development of turbomachinery towards high parameters and large capacity, gas (steam) flow excitation becomes more and more frequent, and the harm becomes more and more serious. Studies have shown that the fluid flow in the seal is one of the main sources of the airflow excitation force, and people usually use 8 stiffness and damping coefficients to express the dynamic characteristics of the seal. [0003] Studies have shown that the flow of fluid in the seal is very complicated, and there are many factors affecting the dynamic characteristics of the seal, such as seal form, tooth thickness, tooth height, arrangement, eccentricity ratio, inlet and outlet pressure ratio, speed, etc. Computational modeling is d...
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IPC IPC(8): G01M10/00
Inventor 杨建刚张万福曹浩孙丹郭瑞
Owner SOUTHEAST UNIV