Sealing failure and fretting fatigue behavior of fittings induced by pipeline vibration

Long service time and excessive vibration of aero-engine will cause failure of clamps, which usually fix pipelines on the outside of an aero-engine. In this paper, the nonlinear vibration characteristics caused by loosening clamps in aero-engine pipeline are determined. According to the real parameters of an aero-engine clamp-pipeline test rig, the clamp is simplified into a nonlinear spring-damping. Thus, a clamppipeline nonlinear model based on cubic stiffness is established. The multi-scale method is used to obtain the analytical solution of the nonlinear model. Based on the real test data, the model parameters of the clamp-pipeline nonlinear system are identified, and then the nonlinear vibration characteristics of the system are obtained. Finally, using the vibration transmissibility method, the influence of the severity of clamp loosening on the nonlinear vibration characteristics of the system is obtained.

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“…The amplitude a and the phase difference angle φ are determined by Eq. ( 20) and (21). Define 1 T     , then Eq.…”

Section: B Analytical Solution Based On Multi-scale Methodsmentioning

confidence: 99%

“…In addition to the simulation method, analyzing the measured data of the test rig is also an effective method to explore the pipeline system. Yan and Chai [21], through accelerated tests, found that excessive vibration and unreasonable pre-tightening force will cause pipeline seal to fail.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Characteristic of Clamp Loosing in Aero-Engine Pipeline System

et al. 2021

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“…Fretting wear occurs on the contact surface of static seal, which will not affect the sealing effect in a short time, and fretting fatigue will occur when fretting wear occurs for a long time, which will lead to serious accidents if it is not found in time. Saintier et al [61] proposed two methods for predicting rubber fatigue life: 1. Crack nucleation method, which predicts the number of cycles resulting in the maximum crack of the material according to the stress and strain at a certain point.…”

Section: Rubber Wear Typementioning

confidence: 99%

Research status and prospect of wear and aging on hydraulic rubber sealing materials

Zhang

Yang

Wang

et al. 2023

Plastics, Rubber and Composites

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The aging and wear of rubber seals cause frequent maintenance of the hydraulic system. Based on the literature, the failure mechanism of aging and wear of rubber materials in hydraulic system was studied in this paper. Fretting wear, abrasive wear, fatigue wear and adhesive wear were the main wear mechanisms. The swelling aging of rubber accelerates the wear. At the same time, the factors affecting the wear resistance of rubber such as temperature, displacement amplitude, liquid medium and surface roughness were discussed. The research status of improving the wear resistance of rubber in recent years was introduced from three aspects: reinforcing filler, surface treatment, heat generation and heat conductivity of rubber, and the development trend of hydraulic sealing technology in the future was prospected.

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“…During the service process, these pipelines will be subjected to vibration due to the excitations of the engine’s inner rotor, transmission components, pressure pulsation of the pump source, etc. Excessive vibration will lead to fatigue and other failure problems (Li and Wang, 2013; Yan and Chai, 2020), such as loosening of pipeline connecting parts, fatigue at welds of pipeline joints and cracks in pipe body. By analyzing the characteristics of excitation force, when the pipeline system is at the position of the fan casing, it mainly suffers excitation caused by the high-pressure and low-pressure rotor systems, and the excitation belongs to harmonic excitation.…”

Section: Introductionmentioning

confidence: 99%

Vibration response analysis and hoop layout optimization of spatial pipeline under random excitation

Wang

Sun

Gao

et al. 2022

AEAT

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Purpose In many cases, the external pipelines of aero-engine are subjected to random excitation. The purpose of this paper is to reduce the vibration response of the pipeline system effectively by adjusting the hoop layout. Design/methodology/approach In this paper, a spatial pipeline supported by multi-hoops is taken as the object, the methods of solution of the vibration response of the pipeline system by using pseudo excitation and hoop layouts optimization with amplitude reduction of vibration response as the goal are presented. First, the finite element model of the spatial pipeline system is presented. Then, an optimization model spatial pipeline is established. Finally, a case study is carried out to prove the rationality of the random vibration response analysis of the pipeline system. Furthermore, the proposed optimization model and genetic algorithm are applied to optimize the hoop layout. Findings The results show that the maximum response variance after optimization is reduced by 32.8%, which proves the rationality of the developed hoop layout optimization method. Originality/value The pseudo excitation method is used to solve the vibration response of aero-engine pipeline system, and the optimization of the hoop layout for aero-engine spatial pipelines under random excitation to reduce random vibration response is studied systematically.

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Sealing failure and fretting fatigue behavior of fittings induced by pipeline vibration

Cited by 30 publications

References 19 publications

Nonlinear Characteristic of Clamp Loosing in Aero-Engine Pipeline System

Nonlinear Characteristic of Clamp Loosing in Aero-Engine Pipeline System

Research status and prospect of wear and aging on hydraulic rubber sealing materials

Vibration response analysis and hoop layout optimization of spatial pipeline under random excitation

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