PDF disclaimer. This PDF file may contain embedded typefaces. In accordance with Adobe’s licensing policy, this file may be printed or viewed. ISO MECHANICAL VIBRATION AND SHOCK – EVALUATION OF HUMAN EXPOSURE TO WHOLE-BODY VIBRATION – PART 4. ANSI/ASA/ISO AMERICAN NATIONAL STANDARD MECHANICAL VIBRATION AND SHOCK – EVALUATION OF HUMAN EXPOSURE TO.
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Three principal frequency weightings are described in the ISO Standard: Wk for the Z axis or vertical direction, Wd for the Isoo and Y axes, or horizontal direction, and Wf for motion sickness. Additional frequency weightings defined for the special cases of seat-back measurements, rotational vibration and vibration under the head.
In addition the ISO Wh and British BS Wg frequency weighting filters are included to provide a complete, standards-based frequency weighting solution.
Acceleration data is processed by the frequency weighting filter in one step, where the filter is designed as per the isi specification and the data is filtered in the time domain with a high precision digital filter.
An evaluation of the effect of exposure to ios on humans is performed by weighting the root-mean of acceleration data transmitted via supporting structures.
It is necessary to use standard methods for frequency weighting so that results from iiso measurements, using different equipment, can be compared.
The ISO Standard describes weighting filters for combinations of sitting, standing and recumbant positions for the analysis of health, discomfort, perception and motion sickness. Several frequency curves are presented covering the most significant combinations of vibration axes and effects health, comfort, perception, motion sickness.
Three of these curves are used in the evaluation of vibration, from the point of view of health effects, and two in the procedure of assessment of vibration severity. In addition, the ISO Standard defines a frequency kso curve for hand vibration and the British BS Standard defines a curve for activity interference. The ISO Module supports all ten of these standard filter types as described below:. The desired filter coefficients are generated by converting the analogue filter specifications detailed in the supported standards into the digital domain using the bilinear transform method.
Because the filter is comprised of several cascaded sub-filters the coefficients of each sub-filter are calculated and combined via convolution to produce the equivalent coefficients of the resulting monolithic digital filter. The resulting coefficients are in second order CASCADE form and 26314 used to process the data 2631–4 high numeric precision and stability. The design and processing of data with a supported frequency weighting filter is accomplished in one easy step.
Both an interactive dialogue box interface and simple command line functions are provided. For example, to process acceleration data in Window 1 with an ISO Wk frequency weighting filter:.
The dialogue box interface makes selecting and processing data with a frequency weighting filter as simple as a mouse click. Hi Bob, Thank you so much for this and your prompt reply. I will try downloading it now. Here is to the best software support team — ever!
BS ISO 2631-4:2001+A1:2010
You have definitely made my day! Bitte kontaktieren Sie uns wenn Sie Fragen oder Anregungen haben. Knowledge Base List Archives Downloads. Key lso Simple dialogue box user interface. Supports ISO Wh frequency weighting filter. Supports BS Wg frequency weighting filters.
DADiSP: ISO frequency weighting
One step design and data processing. Optional frequency domain weighting curve display.
ISO Standard It is necessary to use standard methods for frequency weighting so that results from different measurements, using different equipment, can be compared. The ISO Module supports all ten of these standard filter types as described below: Excellent — a natural teacher!