JIS C 60068-2-57:2018

Introduction1 Scope and object2 Normative references3 Definitions 3.1 critical frequency 3.2 damping 3.3 critical damping 3.4 damping ratio 3.5 signal tolerance 3.6 fixing point 3.7 g[n] 3.8 high peaks of the response 3.9 measuring points 3.9.1 check point 3.9.2 reference point 3.10 natural frequency 3.11 natural time-history 3.12 oscillator 3.13 pause 3.14 preferred motion sample 3.16 required response spectrum 3.17 response spectrum 3.18 sampling frequency 3.19 strong part of the required response spectrum 3.20 strong part of the time-history 3.21 sweep cycle 3.22 synthesized time-history 3.23 test level 3.24 test response spectrum 3.25 time-history 3.26 zero period acceleration4 General requirements5 Requirements for testing 5.1 Vibration response investigation 5.1.1 Basic motion 5.1.2 Spurious motion 5.1.3 Signal tolerance 5.1.4 Vibration amplitude tolerances 5.1.5 Frequency tolerances 5.1.6 Sweeping 5.1.7 Damping ratio 5.2 Time-history testing 5.2.1 Basic motion 5.2.2 Transverse motion 5.2.3 Rotational motion 5.2.4 Tolerance zone for the required response spectrum 5.2.5 Frequency range 5.2.6 Calculation of the test response spectrum 5.3 Mounting6 Severities 6.1 Test frequency range 6.2 Required response spectrum 6.3 Number and duration of time-histories 6.3.1 Number of time-histories 6.3.2 Time-history duration 6.3.3 Duration of the strong part of the time-history 6.4 Number of high peaks of the response7 Preconditioning8 Initial measurements9 Testing 9.1 General 9.2 Vibration response investigation 9.3 Time-history testing 9.3.1 Single axis testing 9.3.2 Biaxial testing 9.3.3 Triaxial testing10 Intermediate measurements11 Recovery12 Final measurements13 Information to be given in the relevant specificationAnnex A (informative) Synthesis of the artificial time-history: GuidanceAnnex B (informative) Test frequency ranges