Jaroslaw Zwierzchowski

A method for determining the median line of measured cylindrical and conical surfaces

The paper presents a novel method for the determination of the median line of the cylindrical and conical surfaces. This method can be incorporated into virtually any cylindricity measurement strategy, including the bird-cage strategy and the helical line strategy. In the study, a median line was determined by minimizing the functional made up of two components. The form of the first component results from the classic definition of the median line provided in the corresponding standard. The other, termed the bending energy, is responsible for ensuring appropriate smoothness of the median line. In order to solve this variational problem, the median line was approximated by means of linear combination of cubic B-spline functions. A simulation and experiments were conducted to establish the suitability of the algorithm developed for the determination of the median line using the helical-line and the cross-section measurement strategy.

Design of a Test Stand for Rolling Bearing Durability Testing

The paper presents a design basis adopted for the construction of a test bench for rolling bearing durability testing. This article presents preliminary engineering requirements and the design of a special test rig for the examination of rolling bearings without the necessity of mounting the bearings in a specific machine component unit. The rig testing is widely used in consideration of numerous good points of such a method. The on test rigs consists in reproducing as accurately as possible the real conditions of operation of the bearings when mounted in the device for which they are intended. The device allows is capable of testing the running characteristics of bearings under varying test conditions and loads, speeds, lubrication conditions and temperatures. In addition they allow to test the service life under the set operating conditions.

Acquisition of Measurement Data on a Stand for Durability Tests of Rolling Bearings

A stand for durability testing of rolling bearings is presented in this paper. The project assumptions of the stand, mechanical construction and architecture of data acquisition and analysis system (hardware and software) are described in this paper. Finally, there are conclusions about stand’s capabilities included. The device allows is capable of testing the running characteristics of bearings under varying test conditions and loads, speeds, lubrication conditions and temperatures. This stand provides precise measurements and autonomic work which is necessary in long-term researches. Compact construction of the stand containing overload protection system and automatic turn off system, activated after exceeding limit values of operating parameters or diagnostic signals, allows autonomic work without frequent human supervision. The data obtained from the stand will be used in future researches. In addition, they allow to test the service life under the set operating conditions.