Method for analyzing static strength characteristics of turbomachinery blade based on CPU+GPU heterogeneous parallel computing

A turbomachinery and characteristic analysis technology, applied in calculation, geometric CAD, design optimization/simulation, etc., can solve problems such as slow calculation speed, complicated boundary conditions, loads, and complex models

Active Publication Date: 2017-04-19
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the complex model of turbomachinery blades, cumbersome boundary conditions and loads, and CPU-based finite element calculations are often slow when dealing with blades with a large number of meshes (the number of meshes usually exceeds 500,000). The design cycle of blades is signif

Method used

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  • Method for analyzing static strength characteristics of turbomachinery blade based on CPU+GPU heterogeneous parallel computing
  • Method for analyzing static strength characteristics of turbomachinery blade based on CPU+GPU heterogeneous parallel computing
  • Method for analyzing static strength characteristics of turbomachinery blade based on CPU+GPU heterogeneous parallel computing

Examples

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Effect test

example 1

[0159] The cantilever beam model is used for testing. The size of the cantilever beam is 50mm in the X direction, 4mm in the Y direction, and 3mm in the Z direction. The geometric model of the cantilever beam is as follows image 3 In (a), the finite element mesh model such as image 3 In (b), the material parameters are elastic modulus 210GPa, Poisson's ratio 0.3, and density 7850kg / m 3 . The boundary condition is that all nodes on the YOZ plane are constrained, the load is a centrifugal force load, and the angular velocity around the Z axis is 100rad / s. In order to verify the acceleration effect of parallel computing under different grid densities, the number of calculated grids is selected according to Table 1.

[0160] Table 1 Test calculation cantilever beam grid number

[0161]

[0162] Figure 4 Comparing the distribution cloud diagram of TBFEA and ANSYS results when the program calculates the cantilever beam model, it is the displacement distribution cloud diagr...

example 2

[0165] For a long blade model with a shroud / tie bar structure, the main body uses an eight-node hexahedron element, and the tetrahedron and degenerate elements are used for meshing in the transition part between the blade root and the tie bar. The unit has a total of 206,292 elements, 216,798 node, Figure 6 (a) gives the overall finite element mesh model of the long blade, Figure 6 (b), (c), and (d) show the local meshing status of the blade root platform / tie bars / shroud. In this example, regardless of the wheel rim, the four load-bearing tooth surfaces of the fir tree-shaped blade root are all fixed, and a positive pressure of 100N is applied to the contact surface of the tendon shroud part to simulate the pressure generated by the contact surface of the tendon / shroud contact surface , and finally apply a centrifugal force load with a working speed of 3000r / min.

[0166] Table 2 Summary of the maximum Von-Mises stress status of each part of the long blade

[0167]

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Abstract

The invention discloses a method for analyzing static strength characteristics of a turbomachinery blade based on CPU+GPU heterogeneous parallel computing. The method comprises the following steps of firstly, establishing a finite element model, computing the total stiffness matrix of the model, then, computing the centrifugal load vector and the pneumatic load vector of the turbomachinery blade, performing displacement constraint and coupling of a node, and correcting the total stiffness matrix; and then, solving an equation set formed by the total stiffness matrix and the load vector in parallel by using CPU+GPU, obtaining a node displacement vector, then, computing the principal strain and the VonMises equivalent stress, drawing a distribution cloud picture, and finally, performing safety check. By means of the method disclosed by the invention, for static strength analysis and design of the turbomachinery blade, project planners can perform operation conveniently; simultaneously, due to an adopted CPU+GPU parallel algorithm, the computing speed of a finite element method can be effectively increased; an accurate and rapid blade static strength characteristic analysis result is provided for design of the turbomachinery blade; and the design period of the turbomachinery blade is greatly shortened.

Description

technical field [0001] The invention belongs to the field of engineering design and calculation, and in particular relates to a method for analyzing static strength characteristics of turbomachinery blades based on CPU+GPU heterogeneous parallel computing. Background technique [0002] Blades undertake the important task of converting heat energy into mechanical energy in turbomachinery, and are one of the most important parts in turbomachinery. The blade not only bears the joint action of centrifugal force, steady air flow force and alternating stress during operation. With the increase of turbine power, the centrifugal load and air flow load of the final blade gradually increase, the working environment of the blade tends to be complicated and harsh, and the damage of the blade is also the main reason for the failure of the turbomachinery. In case of moderate damage or even destruction, the static strength check must be carried out before the blade design. [0003] The m...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23G06F30/17
Inventor 谢永慧刘天源赵伟张荻
Owner XI AN JIAOTONG UNIV
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