AS 60068.2.59-2003

1 - AS 60068.2.59-2003 ENVIRONMENTAL TESTING - TEST METHODS-TEST Fe: VIBRATION-SINE BEAT METHOD
4 - PREFACE
5 - CONTENTS
7 - INTRODUCTION
7 - RELATED DOCUMENTS
9 - 1 Object
9 - 2 General description
9 - 3 Definitions
10 - 3.1 critical frequency
10 - 3.2 crossover frequency
10 - 3.3 damping
10 - 3.3.1 critical damping
10 - 3.3.2 damping ratio
10 - 3.4 distortion
10 - 3.5 fixing point
10 - 3.6 "Gn"
10 - 3.7 measuring points
11 - 3.7.1 check point
11 - 3.7.2 reference point
11 - 3.8 modulating frequency
11 - 3.9 high-stress cycles
11 - 3.10 pause
11 - 3.11 preferred testing axes
11 - 3.12 sine beat
11 - 3.13 sweep cycle
11 - 3.14 test frequency
11 - 3.14.1 predetermined test frequency
11 - 3.14.2 investigated test frequency
12 - 3.15 test level
12 - 4 Requirements for conditioning
12 - 4.1 Vibration response investigation
12 - 4.1.1 Basic motion
12 - 4.1.2 Transverse motion
12 - 4.1.3 Rotational motion
13 - 4.1.4 Measuring points
13 - 4.1.5 Acceleration distortion
13 - 4.1.6 Vibration amplitude tolerances
13 - 4.1.7 Frequency range and tolerances
14 - 4.1.8 Sweeping
14 - 4. 2 Sine-beat conditioning
14 - 4.2.1 Basic motion
14 - 4.2.2 Transverse motion
14 - 4.2.3 Rotational motion
14 - 4.2.4 Vibration amplitude tolerances
15 - 4.2.5 Test frequency tolerances
15 - 4.3 Mounting
15 - 5 Severities
15 - 5.1 Test frequencies
15 - 5.1.1 Test frequency determination
16 - 5.1.2 Test frequency range
16 - 5.2 Test level
18 - 5.3 Sine-beat test wave
18 - 5.3.1 Number of cycles in the sine beat
18 - 5.3.2 Modulating frequency
18 - 5.4 Number of sine beats
18 - 5.5 Low-cycle high-stress fatigue effects
18 - 6 Preconditioning
18 - 7 Initial measurements
18 - 8 Conditioning
18 - 8.1 General
19 - 8. 2 Vibration response investigation
19 - 8. 3 Sine-beat conditioning
19 - 8.3.1 Single axis conditioning
19 - 8.3.2 Biaxial conditioning
19 - 8.3.3 Triaxial conditioning
19 - 9 Intermediate measurements
20 - 10 Recovery
20 - 11 Final measurements
20 - 12 Information to be given in the relevant specification
21 - Annex A - Guide
21 - A.1 Introduction
22 - A.2 Correlation of sine beats of displacement, velocity and acceleration
23 - A.3 Test level
23 - A.4 Low-cycle high-stress fatigue

Provides a standard procedure for determining, by the sine-beat method, the ability of a specimen to withstand specified severities of transient vibration.

To provide a standard procedure for determining, by the sine-beat method, the ability of a specimen to withstand specified severities of transient vibration.

First published as AS 60068.2.59-2003.