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Dynamic modeling method of twisted blade based on setting angle

A technology of blade dynamics and modeling methods, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as blade vibration cannot be considered, and achieve the effect of cost saving

Active Publication Date: 2017-09-22
NORTHEASTERN UNIV
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Problems solved by technology

However, the existing cantilever beam model can only consider the vibration of the centroid of the blade section along the radial direction, transverse direction and swing direction, but cannot consider the vibration of the blade along the width direction.
[0007] At present, based on the vibration theory of plates and shells, the technology of dynamic modeling of rotating blades using cantilever pre-torsion plates is blank

Method used

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  • Dynamic modeling method of twisted blade based on setting angle
  • Dynamic modeling method of twisted blade based on setting angle
  • Dynamic modeling method of twisted blade based on setting angle

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Embodiment Construction

[0080] An embodiment of the present invention will be further described below in conjunction with the accompanying drawings.

[0081] The schematic diagram of the rotating pre-twisted cantilever plate in the embodiment of the present invention is as follows figure 2 As shown in , the dynamic modeling method of twisted blade with installation angle includes the following steps:

[0082] Step 1: obtain the structural parameters and material parameters of the blade system, the present invention assumes that the blade is an isotropic linear elastic material, and the constitutive relationship satisfies Hooke's law, and the relevant parameters of the rotating blade are as shown in Table 1:

[0083] Table 1 Rotating Blade Parameters

[0084]

[0085] Step 2: Considering the influence of the pre-twist angle of the plate, determine the displacement vector and velocity vector of any point Q in the global coordinate system after the blade is deformed:

[0086]

[0087]

[008...

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Abstract

A dynamic modeling method of a twisted blade based on a setting angle belongs to the field of dynamic modeling technologies of blades. The invention is characterized by providing a dynamic modeling method of a twisted blade with a setting angle that considers the influences of centrifugal stiffening, spin softening and Coriolis force of the blade. According to the method provided by the invention, the cost expenses for dynamic experiments of the blade can be saved; dynamic models of different blade systems can be obtained only by modifying the structure sizes and material parameters of the blade, and simple and convenient operations can be achieved; the influences of the setting angles and twist angles in real blades are considered, and the geometrical structure of the blade is closer to the real blades; the influences of centrifugal stiffening, spin softening and the Coriolis force of the blade during rotation are considered, and thus the dynamic characteristics of the blade can better reflect the real working state of the blade; compared with a method for analyzing the dynamic characteristics of the blade by virtue of the traditional commercial finite element software, the higher calculation efficiency can be achieved; and meanwhile, the rub-impact response analysis of the blade systems can also be carried out, and thus the design optimization can be provided for the system structures including the blades.

Description

technical field [0001] The invention belongs to the technical field of mechanical dynamics, and relates to a dynamic modeling method of a blade, in particular to a dynamic modeling method of a twisted blade with an installation angle considering the influence of the centrifugal stiffening, rotational softening and Coriolis force of the blade. model method. Background technique [0002] At present, the existing modeling methods for twisted blades with installation angle mainly include the following methods: [0003] 1. Based on commercial finite element analysis software [0004] Import the CAD 3D model into the commercial finite element analysis software or directly build the 3D model in the finite element software, select the appropriate unit and material parameters, mesh the 3D model, establish the finite element model, set the appropriate constraints and select A suitable solution method is used to analyze the dynamic characteristics of the blade. However, when the exi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/20
Inventor 马辉孙帆谢方涛孙祺崔璨郭旭民
Owner NORTHEASTERN UNIV
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