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This part of iso 21940 specifies requirements for evaluating the performance of machines pdf for balancing rotating components by the following tests: test for minimum achievable residual unbalance, umar test; test for unbalance reduction ratio, urr test; test for couple unbalance interference on single- plane machines;. isomechanical vibration — rotor balancing — procedures and tolerances for rotors with rigid behaviour vibrations mécaniques — équilibrage des rotors — partie 11: modes opératoires et tolérances pour rotors à comportement rigide iso: ( e) iso 21940 pdf reference number © iso copyright protected document. this first edition of isocancels and replaces iso 19499:, which has been technically revised. iso, mechanical vibration — rotor balancing — part 2: vocabulary 3 pdf terms and definitions for the purposes of this document, the terms and definitions given in iso and isoapply. the main changes are as follows: — reference made to all international standards in the iso 21940 series; — deletion of former table 2 " guidelines for balancing procedures" ;. isofirst editionmechanical vibration — rotor balancing — part 14: procedures for assessing balance errors vibrations mécaniques — équilibrage des rotors — partie 14: modes opératoires d’ évaluation des erreurs d’ équilibrage reference number iso: ( e) © iso copyright protected document this document provides a general background to balancing technology, as used in the iso 21940 series, and directs the reader to the appropriate parts of the series that include vocabulary, balancing procedures and tolerances, balancing machines and machine design for balancing. iso 21940 consists of the following parts, under the general title mechanical vibration — rotor balancing: — part iso 21940 pdf 11: procedures and tolerances for rotors with rigid behaviour 1) — part 12: procedures and tolerances for rotors with flexible behaviour 2). iso and iec maintain terminological databases for use in standardization at the following addresses:.
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