ISO 6070:2019 pdf download

ISO 6070:2019 pdf download.Auxiliary tables for vibration generators — Methods of describing equipment characteristics
1 Scope
This document establishes requirements to ensure appropriate exchange of information between manufacturers and users of auxiliary tables with a view to working out related specifications and possibly to comparing, in an objective way, the characteristics supplied by the manufacturers of auxiliary tables and associated guidance systems. This document is applicable to auxiliary tables which include slip tables and head expanders. It does not cover auxiliary tables with several degrees of freedom. This document provides three levels of description of the test equipment, as follows: a) minimum level; b) medium level; c) high level. This document gives a list of characteristics to be specified for each level of description.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 2041, Mechanical vibration, shock and condition monitoring — Vocabulary
ISO 15261, Vibration and shock generating systems — Vocabulary
3 Terms and definitions
For the purpose of this document, the terms and definitions given in ISO 2041 and ISO 15261 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1 slip table
auxiliary table connected to one or several vibration generators working along axes which are parallel to the longitudinal axis of the table
Note 1 to entry: A slip table is normally used to conduct horizontal vibration test.
Note 2 to entry: See 6.4.1 for the coordinates of a slip table.
6.2.2 Expander with linear bearing guidance and air spring support
Air springs are used to provide sufficient supporting force for the fixture and test article. They are normally arranged symmetrically relative to the xOz plane and yOz plane or circularly uniformly along the z axis as illustrated in 6.4.1. As for the test articles with a special shape and mass distribution, the air springs should be arranged accordingly in an asymmetrical and noncircular pattern to make each air spring withstand approximately equal weight and work under its maximum limit. Linear bearings are used in vertical guidance. They are normally arranged symmetrically relative to the xOz plane and yOz plane or circularly uniformly along the z axis as illustrated in 6.4.1. The number of linear bearings used in a configuration is dependent on the overturning moment requirements of the test article and test conditions. The maximum travel of the air springs and linear bearings shall be greater than that of the vibration generator and a safety margin (the ratio of maximum travel of air springs and linear bearings versus vibration generators) shall be maintained. The recommended safety margin is 1,3 to 1,5 for a solid vibration generator system whose trunnion is connected rigidly to the vibration generator. For a trunnion isolated system in which springs are placed between the trunnion and the vibration generator to reduce vibration transmission to the ground, the recommended safety margin should be higher, normally 1,5 to 2,0, because the relative motion between the head expander and the trunnion can exceed the value of travel on the generator table.