Modal and harmonic response analysis of a rolling bearing coupled by rigid and flexible materials

Abstract

Elastic composite cylindrical roller bearing is a new type of rolling bearings. Its rolling body is composed of rigid and flexible materials. In order to investigate the modal characteristics and harmonic response rules of the elastic composite cylindrical roller bearings with different structural parameters, we computed the modal solutions of a cylindrical roller bearing and the elastic composite cylindrical roller bearings with filling degrees of 40%, 50% and 65%, and determined the scope of the excitation frequency according to the computed first twelve orders of the modal frequency. On this basis, we analyzed the steady-state response under a sinusoidal alternating load as well as the vibration conditions of the elastic composite cylindrical roller bearings with different filling degrees within the excitation scope, and explored the relationship between the responses such as displacement and stress and the excitation frequency. The results showed that the natural frequencies of the elastic composite cylindrical roller bearings with filling degrees of 40% and 50% were similar to that of a solid bearing, while that of the elastic composite cylindrical roller bearings with a filling degree of 65% was relatively smaller than that of a solid bearing. The vibration modes of the bearings mainly manifested as bending and torsional deformation of the inner rings. Under the action of an excitation load, the peak responses of the bearings occurred near the fifth and sixth orders of the natural frequency. This research can provide a theoretical reference for the optimal design and engineering applications of the elastic composite cylindrical roller bearings.

Structures Dynamic Property Analysis of Elastic Composite Cylindrical Rolling Element

“…Considering that, system vibration mainly depends on the natural frequencies of low-order modes and the natural frequencies of high-order modes have a non-significant effect on system vibration. According to reference [14,16] on the study of modal shapes, the modes of the first six orders were selected for analysis for each model. The natural frequencies of the modes of the first six orders are listed in Table 1.…”

“…Construction of the Finite Element Model. In this study, the embedding rate of PTFE in the rolling element was adopted to define filling degree K=d/D (where D is the outer diameter of the roller and d is the respective parameter of the embedded PTFE) [13,14]. The specific parameters of N310 elastic composite cylindrical rolling element were selected with reference to GB/T283-2007.…”

Analysis of motion and vibration characteristics of elastic composite cylindrical roller bearing

“…The Block Lanczos method is selected to calculate, and the numerical method is used to select the number of eigenvalues requested. 19 Considering that the natural frequency corresponding to the higher-order mode is large, which has little influence on the vibration of the bearing, the first 12 orders of free mode of the bearing are extracted as reference results. The contact between the parts of the bearing is established in the interaction module, and binding constraints are set between the filling body and the hollow cylindrical roller.…”

Research on Elastic Composite Cylindrical Roller Bearing Contact Fatigue Based on the Subsurface Stress

“…Through the structural innovation design of cylindrical roller bearing, PTFE material is embedded in the deep hollow cylindrical roller to form an elastic composite cylindrical roller structure [17,18], which increases the elasticity of the cylindrical roller, so as to increase the contact area between the roller and the inner and outer rings, reduce the contact stress between the roller and the raceway, improve the safe service life and bearing capacity of the cylindrical roller bearing, and also have obvious effect of vibration reduction and noise reduction. As a new type of cylindrical roller bearing, elastic composite cylindrical roller bearing [19][20][21] also has the problem of fatigue failure. Studying its subsurface stress is helpful to understand the rule of fatigue failure.…”