ISO 02631-2:2003 pdf download
ISO 02631-2:2003 pdf download.Mechanical vibration and shock —
Evaluation of human exposure to whole-body vibration— Part 2: Vibration in buildings (1 Hz to 80 Hz).
Annex A gives the exact definition of the frequency weighting Wm. The values given in Table A.1, applicable to vibration acceleration as the input quantity, are calculated using the true one-third-octave band mid- frequencies and include the band limitation between 1 Hz and 80 Hz. Figure A.1 shows the frequency weighting Wm in a schematic way.
NOTE 2 1’m was previously designated as W.B.combined.
4.5 Evaluation of vibration
4.5.1 Vibration measurement
Vibration values should be determined by application of the methods given in ISO 2631-1. The vibration axis with the highest frequency-weighted vibration magnitude should be identified, and values obtained in this direction used for the evaluation.
In order to allow different kinds of future evaluation, it is recommended, wherever practicable, to use a measurement technique which records vibration time histories unweighted at least within the frequency range 1 Hzto8OHz.
4.5.2 Categories of source
For an evaluation, it is useful to categorize the vibration according to the major types of source which have been found in practice to give rise to adverse comments. Different magnitudes of vibration may be acceptable for the different categories. To establish international consistency of approach, the following categories are defined:
a) continuous or semi-continuous processes, e.g. industry;
b) permanent intermittent activities, e.g. traffic;
C) limited duration (non-permanent) activities, e.g. construction.
The categories have been selected to reflect the human perception of different vibration sources. They are not
intended to be exclusive but to give guidance for the application of this part of ISO 2631.
4.6 Measuring instrumentation
The requirements for measuring instrumentation, including tolerances, as given in ISO 8041 shall be followed.
5 Human responses to building vibration
Experience in many countries has shown that adverse comments regarding building vibration in residential situations may arise from occupants of buildings when the vibration magnitudes are only slightly in excess of perception levels (see ISO 2631-1:1997, Annex C). In some cases complaints arise due to secondary effects associated with vibration, e.g. reradiated noise (see Annex B). In general, satisfactory magnitudes are likely to be related to general expectations and to economic, social and other environmental factors. They are not determined by factors such as short-term health hazards and working efficiency. Indeed, in practically all cases the magnitudes are such that fatigue directly induced by the motion is very unlikely.
Situations exist where significantly higher vibration magnitudes can be tolerated, particularly for temporary disturbances and transient events. Examples of this are construction projects. Any startle factor can be reduced by a proper programme of public relations which may include announcements such as warning signals and/or concerning regularity of occurrence. Only in extremely rare cases should it be necessary to consult the criterion “health” as given in ISO 2631-1. For situations in which vibration occurs over an extended period, long-term familiarization may give rise to a change in adverse comment thresholds.
B.1 Introduction
The basic human response to vibration in buildings is adverse comment. The main body of this part of Iso 2631 concerns the measurement and the evaluation of whole-body vibration. This annex is intended to encourage users to collect data taking into consideration all of those parameters that affect human beings in buildings and which give rise to complaints.
Human response to vibration in buildings is very complex. In many circumstances the degree of annoyance and complaint cannot be explained directly by the magnitude of monitored vibration alone. Under some conditions of amplitude and frequency, claims may arise while measured whole-body vibration is lower than the perception level.
Analysis of these complaints shows that other parameters related to the vibration source (e.g. work time) or produced by the vibration in the exposure area (e.g. reradiated noise) may also give an explanation of the complaints.
Measured vibration parameters, complemented by the evaluation of these phenomena, allow better quantification of the degree of annoyance by vibration in buildings.
Vibration sources outside and inside buildings may generate whole-body vibration, together with the associated phenomena of structure-borne noise, airborne noise, rattling, movement of furniture and other objects, as well as visual effects (e.g. movement of hanging objects). To evaluate human complaints, all of these effects need to be considered.
The aim of collecting data for these associated phenomena is to facilitate the eventual definition of a more general indicator of the annoyance due to vibration. This indicator may be used as the basis to update future editions of this part of ISO 2631.
