Method for damping vibration of blade-wheel disc structure considering nonsynchronous effect
A blade and tuning technology, applied in the field of combinatorial optimization of non-harmonic blades, can solve problems such as complex polynomials, unable to give heuristic factor expressions, etc., to achieve the effect of reducing calculation time, saving optimization calculation time, and fast calculation speed
Inactive Publication Date: 2018-02-23
XI AN JIAOTONG UNIV
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However, the problem of finding the best arrangement of blades is a typical combinatorial optimization problem, and N blades can have arrangement, such as for a turbine stage with 50 blades, with 3×10 64 Arrangement method; with the increase of the number of blades, the complexity of the problem is greater than the complexity of the polynomial, which belongs to the NP problem
The ant colony algorithm has high efficiency for this kind of combinatorial optimization problem, and can obtain a better arrangement method through fewer calculation times; but in the optimization problem of leaf arrangement order, the expression of the heuristic factor cannot be given, and the actual use The efficiency of the optimization algorithm is only close to that of the enumeration method
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[0043] The present invention will be described in further detail below in combination with specific examples according to the content of the invention. The following description is an application of the present invention, but is not limited thereto, and implementers can modify the parameters according to specific conditions.
[0044] Assuming that the combined optimization of the free blade-disk anharmonic blades of a certain compressor is required, and there are 50 blades in a certain turbine stage in this compressor, the specific steps of the combined optimization are as follows:
[0045] Step 1: Mark the blades to be installed with numbers 1,...,50, and measure the static frequency f of each blade i and mass m i ;i=1, 2, 3...,50;
[0046] Step 2: Establish a three-dimensional model of a single standard blade and the rim, and count the volume v of a single standard blade model0 ; then calculate the simulated anharmonic density for each blade Simulated anharmonic elastic ...
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The invention discloses a method for damping vibration of a blade-wheel disc structure considering nonsynchronous effect, and the method is used to optimize the arrangement order of blades and reducethe forced vibration level of the blades under airflow excitation force. The method, by measuring the quality and static frequency of the blades, constructing a heuristic factor calculation form basedon a concept of active non-harmonic damping design, and optimizing the arrangement order of the blades with the ant colony optimization algorithm, can obviously reduce the vibration response of the blade-wheel disc structure under a certain airflow excitation force, improve the convergence speed of the optimization algorithm, and greatly reduce the calculation time, and has important reference value for the design of a turbine blade-wheel disc structure.
Description
technical field [0001] The invention belongs to the field of engineering design and optimization, in particular to a combined optimization method for non-harmonic blades. Background technique [0002] The ideal turbomachinery blade-disk structure is generally cycle-symmetrical, but due to installation errors, operating wear, material differences, etc., there are certain differences in the sectors of different blades, and the blade-disc will show an anharmonic effect. When the same excitation is applied to the harmonic blade and the non-harmonic blade, the forced vibration of the non-harmonic blade is obviously larger than that of the harmonic blade, and the vibration response is concentrated on some blades, causing the local blade vibration to increase by 1-3 times compared with the harmonic blade. , so that the blades with large vibration are prone to high cycle fatigue, which affects the working safety of the unit. [0003] Theoretical and experimental studies show that d...
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IPC IPC(8): G06F17/50
CPCG06F30/17
Inventor 谢永慧李云珠孙磊刘天源张荻
Owner XI AN JIAOTONG UNIV