System information
Blastware Advanced Module
____________________________________________________
6–54 Blastware Operator Manual
If the channel data is in Velocity, the data is differentiated to acceleration prior to the calculation.
The acceleration data is then weighted as specified in the selected Frequency Weighting file. The
available list of weightings includes the ISO 2631-2:2003 Wm weighting. The microphone
channels (4 and 8) are not available if a compliance event has been loaded.
Refer to the following for more information on Human Exposure:
ISO Standard 2631-2:2003
“Mechanical Vibration and Shock – Evaluation of Human Exposure to Whole-Body Vibration.”
Abstract:
ISO 2631-2:2003 concerns human exposure to whole-body vibration and shock in buildings with
respect to the comfort and annoyance of the occupants. It specifies a method for measurement and
evaluation, comprising the determination of the measurement direction and measurement location.
It defines the frequency weighting Wm which is applicable in the frequency range 1 Hz to 80 Hz
where the posture of an occupant does not need to be defined.
Whilst it is often the case that a building will be available for experimental investigation, many of
the concepts contained within ISO 2631-2 would apply equally to a building in the design process
or where it will not be possible to gain access to an existing building. In these cases, reliance will
have to be placed on the prediction of the building response by some means.
ISO 2631-2 does not provide guidance on the likelihood of structural damage, which is discussed
in ISO 4866. Further, it is not applicable to the evaluation of effects on human health and safety.
Acceptable magnitudes of vibration are not stated in ISO 2631-2.
The mathematical definition of the frequency weighting Wm is given in Annex A. Guidelines for
collecting data concerning complaints about building vibration are given in Annex B.
British Standard BS-6841
“Measurement and Evaluation of Human Exposure to Whole-Body Vibration.”
Abstract:
The BS-6841 standard reviews methods of quantifying vibration and shock in relation to human
health, interference with activities, discomfort, the probability of vibration perception and the
incidence of motion sickness. Tentative guidance is given on the possible effects of vibration.
Note: Due to the processing power and decimal accuracy of a PC, performing VDV calculations using the
Blastware Human Exposure tool on a computer will typically produce a higher accuracy result when
compared to the VDV recorded in the field by the Series IV unit. These results will typically be within 5% of
each other.