Mechanical deformation and fatigue fracture of the steel wire layer are the main damage modes of wire reinforced hoses in automotive fuel delivery systems. To investigate the anti-vibration performance of steel wire reinforced hoses, a finite element model covering prestressed modal calculation, harmonic response analysis and random vibration analysis was constructed based on the modal superposition method. Parametric comparative analyses were carried out respectively under varied conditions of hose length (200-320 mm), wall thickness (0.75-0.9 mm) and fuel delivery pressure (0-12 MPa), and the influence laws of each parameter on the anti-vibration performance of steel wire reinforced hoses were obtained. The study revealed that the first six natural frequencies of the model ranged from 66.311 Hz to 108.877 Hz, which were highly overlapped with the energy-concentrated frequency band of 0-100 Hz in the power spectral density (PSD) of road surface excitation. Parametric analyses showed that low-frequency resonance stress could be reduced by lengthening the hose, while stress concentration at the end would be intensified. The vibration characteristics and fatigue damage mechanism of steel wire reinforced hoses under actual service conditions were clarified, which could provide reliable theoretical basis and technical support for the anti-vibration design and parameter optimization of flexible pipelines in automotive fuel systems.
Yonggang Wang (Sun,) studied this question.