BS EN IEC 60068-2-86:2024

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Environmental testing – Tests. Test Fx: Vibration. Multi-exciter and multi-axis method

Published By	Publication Date	Number of Pages
BSI	2024	44

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PDF Catalog

PDF Pages	PDF Title
2	undefined
5	Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
6	English CONTENTS
8	FOREWORD
10	1 Scope
11	2 Normative references
12	3 Terms and definitions
13	4 Background 4.1 General 4.2 Multi-axis and/or multi-exciter testing to achieve an improved distribution of dynamic responses
14	4.3 Multi-exciter testing for large equipment 4.4 Multi-axis testing for reliability growth 4.5 Multi-axis testing to reduce test durations
15	5 Test apparatus and control strategy 6 Test severities and tolerances 6.1 Test severities 6.2 Tolerances 6.3 Excitations outside the specified test frequency range
16	6.4 Crossaxis motions 7 Mounting of specimen and installation of measurement systems
17	8 Precursor testing 9 Vibration response investigation 10 Pre-conditioning
18	11 Initial measurement and functional performance test 12 Low level excitation for equalisation prior to testing 13 Testing 14 Intermediate measurement and functional performance 15 Recovery
19	16 Final measurement and functional performance and vibration response investigation 17 Test verification 18 Information to be specified in the relevant specification
20	19 Information to be given in the test report
22	Annex A (informative)Guidance on multi-axis and multi-exciter test control systems A.1 General A.2 Multi-exciter control strategies
23	A.3 Determined and over determined control strategies
24	A.4 Quantifying the inter-relationship between exciters for vibration testing Figure A.1 – Power Spectral Density (PSD) and Cross-Spectral Density (CSD)for a two exciter system Figure A.2 – Power Spectral Density (PSD) and Cross-Spectral Density (CSD)for a six exciter system
25	A.5 Quantifying the inter-relationship between exciters for time history replication testing
27	Annex B (informative)Additional testing guidance B.1 Fixing, monitor, control and reference points B.2 Control equalisation
28	B.3 Cross-axis motion, signal distortion and out of test frequency range responses
29	B.4 Precursor testing B.5 Vibration response investigation B.6 Temperature conditioning and stabilization
30	B.7 Performance evaluation B.8 Verification of test procedure
32	Annex C (informative)Guidance on the application of multi-axis / multi-vibrator tests C.1 General C.2 Advice on using multi-exciter systems for the testing of large specimens C.2.1 General C.2.2 Data measurements C.2.3 Multi-exciter test fixture
33	C.2.4 Test control C.2.5 Testing C.3 Advice on using multi-axis systems for multi-degree of freedom testing C.3.1 General
34	C.3.2 Data measurements C.3.3 Multi-exciter test fixture C.3.4 Test control C.3.5 Testing
35	C.4 Advice on using multiple shakers attached directly to the specimen via flexible couplings C.4.1 General C.4.2 Data measurements
36	C.4.3 Multi-exciter test fixture
37	C.4.4 Test control Figure C.1 – Examples of spherical bearings
38	C.4.5 Interrelationship in testing
39	Annex D (informative)Guidance on the use of measured data for multi-axis/multi-vibrator tests D.1 General D.2 Use of measured data to derive test severities
41	Annex E (informative)Guidance on the selection of test tolerances E.1 General E.2 Test tolerances associated with measured data E.3 Test tolerances applicable to different parameters
42	Table E.1 – Test tolerances applicable to different parameters
43	Bibliography