Abstract
The vibration transmission characteristics of the bearing housing system are crucial for the system fault diagnosis based on vibration signals collected at various measuring points. To study its vibration transmission characteristics, a dynamic model of the rolling bearing housing system based on the elastic interface is established. The interference fit between the bearing outer ring and the bearing housing is modelled by contact pairs. The proposed model is verified by the experimental results, which demonstrate that the interference fit can be better simulated by contact pairs. Based on the comparisons between the vibration signals obtained from the defect point and the measuring points on the bearing surface, the transmission mechanism of the defect excitation and the generation mechanism of the bearing housing structural vibration are clarified. The change law of defect excitation through an interface and the effects of bearing operational conditions (load and speed) on the vibration signals of measuring points are summarized. The results show that the optimal measuring point on the bearing housing surface is the location that is closest to the defect when the bearing housing system is working under light loads or high speeds. However, when under low speeds, the preferred measuring points are the positions where the rigidity of the bearing housing structure is weak. The analysis results provide a theoretical basis for the sensor arrangement and improvement of fault diagnosis accuracy under different operating conditions.
Highlights
Rolling bearings are one of the most eventful components in machinery and equipment. e acquisition and analysis of vibration signals are important to monitor their internal operating status [1, 2]
Based on the analysis of the vibration signals obtained from the defect point and various measuring points on the housing surface, the transmission mechanism of the defect excitation and the generation mechanism of the bearing housing structural vibration are clarified. e effects of load and speed on the defect excitation transmission and structural vibration are studied, which can provide a theoretical basis for optimal sensor placement under different operating conditions and improve the accuracy of bearing fault diagnosis
Compared with previous finite element models, the proposed model uses sharing nodes and a contact pair between interfaces to simulate the interferences assembly relationship between the bearing and the housing. is allows the proposed model to faithfully reflect the contact conditions and simulate the attenuation phenomenon when the vibration signal transmits from the interior defect excitation point to the exterior measuring point
Summary
Rolling bearings are one of the most eventful components in machinery and equipment. e acquisition and analysis of vibration signals are important to monitor their internal operating status [1, 2]. Ese make it impossible to accurately describe the discrepancies between the vibration of the outer race and vibration of the housing caused by the bearing internal excitation To address this issue, Liu et al [19–21] proposed a dynamic model to study the vibration transmission of a shaft-bearing housing system with a localized fault. Liu et al [19–21] proposed a dynamic model to study the vibration transmission of a shaft-bearing housing system with a localized fault In this model, elastic interfaces were considered, and the vibration transmission characteristics along multiple interfaces caused by the rolling bearing internal impact excitation were investigated. The finite element model can consider the effect of the practical interference connection between the bearing and the housing on the vibration transmission characteristics, it generally uses the sharing nodes to simulate the interference fit of the interfaces, which cannot reflect the actual contact situation. Based on the analysis of the vibration signals obtained from the defect point and various measuring points on the housing surface, the transmission mechanism of the defect excitation and the generation mechanism of the bearing housing structural vibration are clarified. e effects of load and speed on the defect excitation transmission and structural vibration are studied, which can provide a theoretical basis for optimal sensor placement under different operating conditions and improve the accuracy of bearing fault diagnosis
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