Experimental Determination of Damping in Rolling Bearing Joints

Abstract

The joints ensure the joint performance of the load carrying structural systems and they are the most responsible and important elements. Keyed joints are widely used in construction. They are characterized by an increased resistance to shear. On these grounds the structural concepts of keyed joints need further improvement. The article presents the research results of experimental test pieces five series in the form of single keys and one-keyed joints. Those samples have been tested in Poltava National Technical Yuriy Kondratyuk University. Follow strength factors have been varied: geometric parameters of joints (depth, height, width) and their ratio; angle of support surface (rectangular, trapezoidal and triangular key); level of compression; reinforcement (quality of reinforcement and the nature of its location); jointing width. The samples were made of heavyweight , expanded clay and fibre concrete. The experiments program includes influence study both of one of these factors and their combinations. The deformations, nature of failure, the ultimate load have been studied. Structural parameters of keyed joints which ensure the efficient behaviour have been installed.

Experimental studies on the dynamic characteristics of rolling element bearings

“…The experiment shows that damping decreases with speed, whereas preloads have the opposite effect on damping in the axial and radial directions. In accordance with the results of Elsermans et al [2], Zeillinger et al [5] presented experimental work on the calculation of the damping coefficients of ball bearings. In this work, it is possible to note that the joint contributes to the damping capability, and the interface damping is certainly influenced by the housing interface clearance.…”

A parametric study of an unbalanced Jeffcott rotor supported by a rolling-element bearing

“…where C b = c b I, and the positive sign is for the inner ring and the negative sign for the outer ring. The constant c b is the viscous damping coefficient and was arbitrarily set to 400 Nsm −1 throughout, which is comparable to experimentally measured values for similar sized bearings [49]. This completes the derivation of the detailed bearing model, incorporating the effect of clearance, ring compliance centrifugal loads, and variable compliance.…”

Rolling bearing damping for dynamic analysis of multi-body systems—experimental and theoretical results

“…In order to assess the damping capability of a dry, lubricant-free bearing, several measurements have been carried out with different bearing types, different numbers of balls in the bearing and different bearing preloads [3,5,6]. The identified damping was expressed in the form of a loss factor c according to equation (1).…”

“…For more information about the damping capability of the interface between the outer ring and housing, the reader is referred to the experimental studies performed by Zeillinger et al [5], [6] and, especially, Ophey [7]. The present paper is organized in the following way.…”