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Mechanical property analysis method of blade and cartridge receiver system under rub-impact fault

An analysis method and technology of mechanical properties, applied in special data processing applications, instruments, electrical and digital data processing, etc., can solve the problem of not considering the elastic support of the blade root, and achieve the effect of accurate mechanical properties and improved calculation efficiency.

Active Publication Date: 2019-12-24
NORTHEASTERN UNIV
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Problems solved by technology

[0004] However, in the existing methods, most of the blades are straight blades, which are modeled with Euler beam elements, without considering the elastic support of the blade root; when calculating the rubbing force, the contact algorithm based on Euler beams is also used

Method used

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  • Mechanical property analysis method of blade and cartridge receiver system under rub-impact fault
  • Mechanical property analysis method of blade and cartridge receiver system under rub-impact fault
  • Mechanical property analysis method of blade and cartridge receiver system under rub-impact fault

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Embodiment Construction

[0069] In order to better explain the present invention and facilitate understanding, the present invention will be described in detail below in conjunction with the accompanying drawings and through specific embodiments.

[0070] The letters and their corresponding meanings involved in the present invention are as follows:

[0071] A Tip point

[0072] A 0 blade cross-sectional area

[0073] Projection of A′ onto the intersection of lines BC and OA on the XOY plane

[0074] A″ Final position of A after eliminating immersion

[0075] b 0 ,b c blade root width; casing width

[0076] B,C is the node of the case unit BC in contact with A

[0077] B c,n ,B c,t ,B c,s Contact constraint matrices in the normal, tangential and axial directions, respectively

[0078] C b , C c Damping matrix for blades and casing

[0079] D The damping matrix of the blade-casing system includes the Rayleigh damping matrix and the Coriolis force matrix

[0080] System damping matr...

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Abstract

The invention belongs to the technical field of mechanical simulation of rotor and stator systems, and particularly relates to a mechanical property analysis method of a blade and a cartridge receiversystem under rub-impact faults. The method comprises the following steps of A1, discretizing the blade to obtain a beam element model of the blade and a spring element model of the blade; A2, discretizing a cartridge receiver to obtain a beam element model of the cartridge receiver; A3, based on the beam element model of the blade, the spring element model of the blade and the beam element modelof the cartridge receiver, constructing a finite element model of the blade and the cartridge receiver system; A4, based on a contact algorithm and in combination with the constructed finite element model of the blade and the cartridge receiver system, obtaining the finite element model of the blade and the cartridge receiver system under the rub-impact fault; and A5, carrying out dimension reduction processing on the finite element model of the blade and cartridge receiver system under the rub-impact fault, thereby obtaining the mechanical properties of the blade and the cartridge receiver system. According to the analysis method, the elastic support problem of the blade root is considered, and the obtained mechanical property is more accurate.

Description

technical field [0001] The invention belongs to the technical field of mechanical simulation of a rotor-stator system, and in particular relates to a method for analyzing the mechanical characteristics of a blade and casing system under rubbing faults. Background technique [0002] In aero-engines, there will be some structural failures in the system represented by rotor blades and stator casings, such as misalignment, mass eccentricity, and casing deformation, which will cause rubbing between the tips of rotor blades and casings. [0003] At present, many scholars have conducted research on this, and put forward some analysis methods about the mechanical characteristics of rubbing. These methods enable designers to simulate the mechanical characteristics of blades and casings when rubbing failures occur, and thus have certain guiding significance for the design of high-performance and stable aero-engines. [0004] However, in the existing methods, most of the blades are st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 马辉赵晨光曾劲李朝峰张学良
Owner NORTHEASTERN UNIV
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