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eLibrary > BS EN IEC 60068-2-86:2024 Environmental testing - Tests. Test Fx: Vibration. Multi-exciter and multi-axis method >

BS EN IEC 60068-2-86:2024 Environmental testing - Tests. Test Fx: Vibration. Multi-exciter and multi-axis method, 2024

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Annex ZA (normative)Normative references to international publicationswith their corresponding European publications [Go to Page]
English [Go to Page]
CONTENTS
FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 Background [Go to Page]
4.1 General
4.2 Multi-axis and/or multi-exciter testing to achieve an improved distribution of dynamic responses
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
5 Test apparatus and control strategy
6 Test severities and tolerances [Go to Page]
6.1 Test severities
6.2 Tolerances
6.3 Excitations outside the specified test frequency range
6.4 Crossaxis motions
7 Mounting of specimen and installation of measurement systems
8 Precursor testing
9 Vibration response investigation
10 Pre-conditioning
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
16 Final measurement and functional performance and vibration response investigation
17 Test verification
18 Information to be specified in the relevant specification
19 Information to be given in the test report
Annex A (informative)Guidance on multi-axis and multi-exciter test control systems [Go to Page]
A.1 General
A.2 Multi-exciter control strategies
A.3 Determined and over determined control strategies
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 [Go to Page]
A.5 Quantifying the inter-relationship between exciters for time history replication testing
Annex B (informative)Additional testing guidance [Go to Page]
B.1 Fixing, monitor, control and reference points
B.2 Control equalisation
B.3 Cross-axis motion, signal distortion and out of test frequency range responses
B.4 Precursor testing
B.5 Vibration response investigation
B.6 Temperature conditioning and stabilization
B.7 Performance evaluation
B.8 Verification of test procedure
Annex C (informative)Guidance on the application of multi-axis / multi-vibrator tests [Go to Page]
C.1 General
C.2 Advice on using multi-exciter systems for the testing of large specimens [Go to Page]
C.2.1 General
C.2.2 Data measurements
C.2.3 Multi-exciter test fixture
C.2.4 Test control
C.2.5 Testing
C.3 Advice on using multi-axis systems for multi-degree of freedom testing [Go to Page]
C.3.1 General
C.3.2 Data measurements
C.3.3 Multi-exciter test fixture
C.3.4 Test control
C.3.5 Testing
C.4 Advice on using multiple shakers attached directly to the specimen via flexible couplings [Go to Page]
C.4.1 General
C.4.2 Data measurements
C.4.3 Multi-exciter test fixture
C.4.4 Test control
Figure C.1 – Examples of spherical bearings [Go to Page]
[Go to Page]
C.4.5 Interrelationship in testing
Annex D (informative)Guidance on the use of measured data for multi-axis/multi-vibrator tests [Go to Page]
D.1 General
D.2 Use of measured data to derive test severities
Annex E (informative)Guidance on the selection of test tolerances [Go to Page]
E.1 General
E.2 Test tolerances associated with measured data
E.3 Test tolerances applicable to different parameters
Table E.1 – Test tolerances applicable to different parameters
Bibliography [Go to Page]

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