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DIN Standards Committee Rolling Bearings and Plain Bearings

Overview

The document (ISO 15242-1) has been prepared by Technical Committee ISO/TC 4 "Rolling bearings", the secretariat of which is held by SIS (Sweden). The German body responsible for this standard series is Working Committee NA 118-01-04 AA "Toleranzen, Prüf- und Messverfahren" ("Tolerances, measuring and gauging principles and methods") of the Standards Committee Rolling Bearings and Plain Bearings (NAWGL) at DIN. This part of ISO 15242 specifies measuring methods for vibration of rotating rolling bearings under established test conditions, together with calibration of the related measuring systems. Vibration in rotating rolling bearings can be of importance as an operating characteristic of such bearings. The vibration can affect the performance of the mechanical system incorporating the bearing and can result in audible noise when the vibration is transmitted to the environment in which the mechanical system operates. Vibration of rotating rolling bearings is a complex physical phenomenon dependent on the conditions of operation. Measuring the vibration output of an individual bearing under a certain set of conditions does not necessarily characterize the vibration output under a different set of conditions or when the bearing becomes part of a larger assembly. Assessment of the audible sound generated by the mechanical system incorporating the bearing is complicated further by the influence of the interface conditions, the location and orientation of the sensing device, and the acoustical environment in which the system operates. Assessment of airborne noise, which for the purpose of this document can be defined as any disagreeable and undesired sound, is further complicated by the subjective nature of the terms "disagreeable" and "undesired". Structure-borne vibration can be considered the driving mechanism that ultimately results in the generation of airborne noise. Only selected methods for the measurement of the structure-borne vibration of rotating rolling bearings are addressed in the current edition of ISO 15242. This part of ISO 15242 serves to define and specify the physical quantities measured and the general test conditions and environment utilized in the measurement of vibration generated by rolling bearings on a test rig. Based on this part of ISO 15242, parties to the acceptance inspection of rolling bearings may, by agreement, establish acceptance criteria with which to control bearing vibration. Vibration of rotating rolling bearings can be assessed by any of a number of means using various types of transducers and test conditions. No simple set of values characterizing the vibration of a bearing is adequate for the evaluation of the vibratory performance in all possible applications. Ultimately, a knowledge of the type of bearing, its application and the purpose of the vibration testing (for example as a manufacturing process diagnostic or an assessment of product quality) is required to select the most suitable method for testing. The field of application for standards on bearing vibration is, therefore, not universal. However, certain methods have established a wide enough level of application to be considered as standard methods for the purposes of this part of ISO 15242. This part of ISO 15242 serves to define the general principles involved in vibration measurement. It is intended that further parts will specify in more detail the methods for assessing vibration of different types of bearings with cylindrical bore and outside surface. This part of ISO 15242 specifies measuring methods for vibration of rotating rolling bearings under established test conditions, together with calibration of the related measuring systems.

Document: references other documents

Responsible national committee

NA 118-01-04 AA - Tolerances, measuring and gauging principles and methods