BS ISO 7626-5:2019 - Mechanical vibration and shock. Experimental determination of mechanical mobility. Measurements using impact excitation with an exciter which is not attached to the structure

BS ISO 7626-5:2019

Mechanical vibration and shock. Experimental determination of mechanical mobility. Measurements using impact excitation with an exciter which is not attached to the structure

Status : Current   Published : April 2020

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This document specifies procedures for measuring mechanical mobility and other frequency-response functions of structures excited by means of an impulsive force generated by an exciter which is not attached to the structure under test.

It is applicable to the measurement of mobility, accelerance or dynamic compliance, either as a driving point measurement or as a transfer measurement, using impact excitation. Other excitation methods, such as step relaxation and transient random, lead to signal-processing requirements similar to those of impact data. However, such methods are outside the scope of this document because they involve the use of an exciter which is attached to the structure.

The signal analysis methods covered are all based on the discrete Fourier transform (DFT), which is performed mostly by a fast Fourier transform (FFT) algorithm. This restriction in scope is based solely on the wide availability of equipment which implements these methods and on the large base of experience in using these methods. It is not intended to exclude the use of other methods currently under development.

Impact excitation is also widely used to obtain uncalibrated frequency-response information. For example, a quick impact test which obtains approximate natural frequencies and mode shapes can be quite helpful in planning a random or sinusoidal test for accurate mobility measurements. These uses of impact excitation to obtain qualitative results can be a first stage for mobility measurements.

This document is limited to the use of impact excitation techniques for making accurate mobility measurements.




Standard NumberBS ISO 7626-5:2019
TitleMechanical vibration and shock. Experimental determination of mechanical mobility. Measurements using impact excitation with an exciter which is not attached to the structure
StatusCurrent
Publication Date21 April 2020
Normative References(Required to achieve compliance to this standard)ISO 2041
Informative References(Provided for Information)ISO 7626-2:2015, ISO 7626-1:2011
ReplacesBS 6897-5:1995, ISO 7626-5:1994
International RelationshipsISO 7626-5:2019
Draft Superseded By18/30341976 DC
DescriptorsProduction equipment, Error correction, Impact testing, Vibration, Acoustic equipment, Mechanical testing, Vibration measurement, Vibrometers, Transducers, Structures, Fourier analysis, Buildings, Calibration, Mechanical shock, Stability, Frequency response, Errors, Accuracy, Vibration testing, Signal processing, Test equipment, Measuring instruments
ICS17.160
Title in FrenchVibrations et chocs mécaniques. Détermination expérimentale de la mobilité mécanique Mesurages à partir d'une excitation par choc appliquée par un excitateur non solidaire de la structure
CommitteeGME/21/3
ISBN978 0 580 94341 6
PublisherBSI
FormatA4
DeliveryYes
Pages38
File Size3.461 MB
Price£214.00


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