A modeling and vibration characteristic analysis method of an aerial pipeline considering bolt connection

A technology of vibration characteristics and analysis methods, applied in special data processing applications, instruments, electrical digital data processing, etc., to achieve the effect of accurate calculation results

Active Publication Date: 2019-06-18
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the technical problems existing in existing models that are different from the actual structure, the present inve

Method used

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  • A modeling and vibration characteristic analysis method of an aerial pipeline considering bolt connection
  • A modeling and vibration characteristic analysis method of an aerial pipeline considering bolt connection
  • A modeling and vibration characteristic analysis method of an aerial pipeline considering bolt connection

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Embodiment Construction

[0036] In order to better explain the present invention and facilitate understanding, the present invention will be described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0037] Such as figure 1 As shown, the present invention discloses a method for modeling and analyzing vibration characteristics of aviation pipelines considering bolted connections, including the following steps:

[0038] The entity contact finite element model constrained by the pipeline clamp is established, and the elastic modulus of the pipeline is corrected through the free modal test to obtain the corrected pipeline model.

[0039] Under the set tightening torque, the natural frequency is simulated and calculated, and the simulation calculation is verified by the modal test and the basic excitation response test.

[0040] The influence of bolt tightening torque, clamp span and pipe body length on the natural frequency of the double-clamp pipeline system ...

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Abstract

The invention belongs to the technical field of mechanical dynamics, and particularly relates to an aviation pipeline modeling and vibration characteristic analysis method considering bolt connection.The method comprises the following steps: establishing an entity contact finite element model constrained by a pipeline clamp, and correcting the elasticity modulus of a pipeline through a free modaltest to obtain a corrected pipeline model; Carrying out simulation calculation on the inherent frequency under the set tightening torque, and verifying the simulation calculation by adopting a modaltest and a basic excitation response test; And analyzing the rule of the influence of the bolt tightening torque, the clamp span and the pipe body length on the inherent frequency of the double-clamppipeline system. According to the method, a finite element contact model is adopted and is combined with a test to carry out comparative study, and the modeling method is accurate in calculation result and conforms to the actual structure.

Description

technical field [0001] The invention belongs to the technical field of mechanical dynamics, and in particular relates to a method for modeling and analyzing vibration characteristics of an aircraft pipeline considering bolt connections. Background technique [0002] The external pipeline of aero-engine is an important part of the aero-engine, known as the "cardiovascular" of the aero-engine. For a long time, the failure of the external pipeline of the aero-engine caused by vibration has been one of the important problems affecting the reliability of the engine. Therefore, it is particularly important to study the vibration characteristics of the clamp piping system. [0003] In view of the connection characteristics of the external pipelines of the aircraft engine using clamp constraints, Yin Zeyong et al. performed finite element calculations on the clamp stiffness, and verified the stiffness of typical clamps through experiments, and obtained a calculation method for the c...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCY02T90/00
Inventor 马辉柴清东朴玉华吴文轩
Owner NORTHEASTERN UNIV
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