Improving ISO 2631-1 for evaluating discomfort from vibration
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Transcript of Improving ISO 2631-1 for evaluating discomfort from vibration
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Sound Environment as a Global Issue
Application of ISO 2631-1 (1997) for evaluating discomfort from
whole-body vibration: verification using field and
laboratory studies
Dr. Ykä Marjanen and Dr. Neil J. MansfieldLoughborough University, UK
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Sound Environment as a Global Issue
The goal of the research
Provide a practical method for engineers to minimize the negative effects of vibration
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Sound Environment as a Global Issue
Effects of vibration exposure
HealthHealth
Dis-comfor
t
Dis-comfor
t
Back painLong term effectsMany variablesComplex cause-effect relationship
More psychologicalImmediate feedbackLess variablesSimpler cause-effect relationship
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Sound Environment as a Global Issue
Current knowledge
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Sound Environment as a Global Issue
Current knowledge
Little information on effect of time
Little information on the variability of sex and size of a person
Few studies on combining the axes
Few studies on determining best averaging method
One study of using all 12 axes in field
One study to determine correlation in field
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Sound Environment as a Global Issue
Evaluation of ISO 2631-1
• Is the standard method valid?
• What is best approach of using it?
• How well does it predict discomfort?
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Sound Environment as a Global Issue
Which axes dominate in field
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Sound Environment as a Global Issue
Validating the standard method
• Seat translational axes are enough for prediction
• Frequency weighting works
• R.m.s. is better than r.m.q.
• Multiplying factors do not work well
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Sound Environment as a Global Issue
Improving the standard method
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Sound Environment as a Global Issue
Simplifying the guidance on using the method
• Measure three translational axes from the seat
• Use the r.m.s. method to average them
• Combine to a single value using 1.4 multiplying factors
• Compare two or more setups in same environment
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Sound Environment as a Global Issue
Concluding the necessary changes and research for improving the
method• Getting rid of the options for using the
additional axes
• Providing guidance on how to interpret the results
• Providing a method to optimize multiplying factors for different environments