ISO 5344:2004

INTERNATIONAL ISO
STANDARD 5344
Second edition
2004-07-01
Electrodynamic vibration generating
systems — Performance characteristics
Systèmes électrodynamiques utilisés pour la génération de
vibrations — Caractéristiques de performance

Reference number
©
ISO 2004
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ii © ISO 2004 – All rights reserved

Contents Page
Foreword. iv
Introduction . v
1 Scope. 1
2 Normative references . 1
3 Terms and definitions. 2
4 Structure of this International Standard. 6
4.1 General. 6
4.2 Subclause coding . 6
4.3 Symbol coding . 7
5 Systems. 7
5.1 General. 7
5.2 System specifications (S,a). 7
5.3 System performance. 8
5.4 Calculated system performance. 9
6 Electrodynamic vibration generators . 10
6.1 Vibration generator specification (C,a). 10
6.2 Vibration generator performance . 11
6.3 Vibrator drive requirements. 12
6.4 Vibrator maintenance (A,a) . 15
7 Power amplifiers . 15
7.1 Amplifier specification (C,a). 15
7.2 Amplifier test loads. 16
7.3 Amplifier performance. 17
7.4 Amplifier maintenance (A,a). 19
8 Tests and measurements. 19
8.1 General. 19
8.2 Conditioning before data runs. 19
8.3 Endurance tests . 20
8.4 Spill-over limits . 21
8.5 Distortion tests. 22
8.6 Impulse generation . 24
Annex A (informative) Additional equipment characteristics . 25

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 5344 was prepared by Technical Committee ISO/TC 108, Mechanical vibration and shock, Subcommittee
SC 6, Vibration and shock generating systems.
This second edition cancels and replaces the first edition (ISO 5344:1980), which has been technically revised.
Considered responses to all of the proposed substantive changes to ISO 5344:1980 are incorporated in this
second edition. Changes favouring the specific design of individual sources were rejected. Regarding
endurance testing, a compromise is incorporated, providing a less expensive, but hopefully adequate,
assurance of reliability.
iv © ISO 2004 – All rights reserved

Introduction
Users want their equipment to operate for long period without malfunction. A major purpose of this
International Standard is to establish procedures to measure performance and to provide ways to ensure the
reliability of electrodynamic vibration generation equipment and systems. Some assurance of reliability, but
not conclusive, is provided by endurance tests on the vibrator, amplifier and the system as a whole.
If all sources of electrodynamic vibration generation equipment and systems use the same procedures, these
procedures define the meanings of the performance statements and reliability statements. Comparisons of the
performance and reliability statements of the different sources become useful.
Many of these procedures are suitable for incorporation in a purchase specification to state the acceptance
testing to be carried out upon delivery.
Others, particularly those related to endurance testing, are lengthy and expensive, and typically are performed
by the source at the end of the product development process, before the start of series production. These
procedures typically are used to establish and confirm the rated performance stated in the sales literature.
After discussions with the proposed sources, the writer of the purchase specification may propose abbreviated
procedures for equipment acceptance testing, or alternatively, may propose to accept written assurances that
the full procedures have been performed by the source with mutually satisfactory results.

INTERNATIONAL STANDARD ISO 5344:2004(E)

Electrodynamic vibration generating systems — Performance
characteristics
1 Scope
This International Standard specifies the performance characteristics and performance test conditions for
electrodynamic vibration generator systems and provides a list of additional equipment characteristics (see
Annex A) that can be declared by the equipment manufacturer. This information can be used by the user or
the writer of specifications for equipment for the selection of such a system, taking into account its application.
This International Standard establishes procedures for calculating the system performance of a system
comprising an amplifier from one source and a vibrator from a different source. Such a calculated system
performance is less precise than performance measured on a system comprising the actual vibrator and
amplifier, and a reserve of calculated force is recommended. It can be desirable to specify separately the
acquisition of needed vibrator and/or amplifier interface data, particularly if a vibrator or amplifier is to be
acquired to add to an existing installation. It can also be desirable to specify the responsibility for the
calculation of performance.
This International Standard is applicable to equipment producing sine, random and impulse rectilinear
vibration. It is implied that all systems are usable for sine testing at least at a low level, since sine capability is
needed for specimen response evaluation and transfer function measurements for random and impulse
testing. When random capability is specified, it is implied that some sine capability is also available. Similarly,
when impulse capability is specified, it is implied that some sine, but not necessarily random, capability is
available.
NOTE Three groups of people are expected to use this International Standard: the supplier of the equipment, the
purchaser of the equipment, and the organization that tests the equipment. The supplier of the equipment states that
“rated” performance is available, typically as stated in sales literature. The purchaser states the “specified” performance of
the equipment that he will accept, typically less than or equal to the rated performance. The test organization “provides”
the results of its tests and observations, typically by a written report, which may include the conditions and accuracy of
each measurement, and illustrations such as waveforms, performance graphs and tables of values.
2 Normative references
The following referenced documents are indispensable for the application 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 2041:1990, Vibration and shock — Vocabulary
ISO 15261, Vibration and shock generating systems — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 2041, ISO 15261 and the following
apply.
3.1
electrodynamic vibration generator
vibrator
vibration generator which derives its vibratory force from the interaction of a magnetic field of constant value,
and a coil of wire contained in it which is excited by a suitable alternating current
[ISO 2041:1990]
NOTE 1 Unless specifically restricted to the moving element, body and base of the vibrator machine, this includes the
flexible field, control and drive cables, coolant hoses, field supply, and cooling, demagnetizing, protective and safety
systems.
NOTE 2 In this International Standard, the subscript “ v ” is used to indicate vibrator, short for electrodynamic vibration
generator. The word vibrator, which has the same meaning, is the term commonly used in industry.
3.2
power amplifier
amplifier
power electronic device capable of providing the voltage and current used to drive the vibrator
NOTE Unless otherwise specified, this includes the cooling, protective and safety systems.
3.3
system
combination of a power amplifier and an electrodynamic vibration generator to provide vibratory force
NOTE The following are excluded from this International Standard, but are included in the more inclusive
electrodynamic vibration test facility system:
 the input signal source and control (typically providing controlled sinusoidal, random or shock simulation signals);
 specim
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