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Comparison of Measurement Methods for Evaluating Displacement of Commercial Vehicle Seats
Technical Paper
2019-01-1481
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Measuring the displacements in vehicle seat suspensions and the displacements the seat has to absorb may assist vehicle seat designers in better designing seats to absorb vibrations. Low frequency seat displacement is important in seat design to identify end-stop events and higher frequency shorter displacements are also important since seat components can be optimized to absorb these smaller displacements. Displacements can be directly measured with special instruments, but it would be less complicated if simple, compact accelerometers could be used to measure the seat displacements. This paper compares accelerometer-derived displacement measurements to known displacements derived from sinusoidal physics and field measured random displacements measured with potentiometers. Using known, controlled sinusoidal displacements, three lab-based experiments were conducted to determine how well accelerometers, using double integration, could measure displacements. In addition, using a vehicle travelling on four different road types, the capability of accelerometers measuring random displacement was assessed. In general, the accelerometer-derived displacements matched the known sinusoidal displacement in the lab settings and the potentiometer measured displacements in the field; however, limitations were identified. First, the frequency bandwidth of the accelerometers can be a limitation. Most accelerometers are limited in their ability to measure low frequency vibrations (0 - 3 Hz) so MEMS-based accelerometers with DC resolution may facilitate better capture of the low frequency displacements. Second, the direct displacement measurements need to be more robust. Potentiometers can be prone to errors due needed signal filtering and additional errors if not correctly mounted and calibrated. With the uncertainty associated with displacement measurement, more systematic evaluation is needed to determine the viability of various transducers for measuring absolute and relative vehicle seat displacements.
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Authors
Citation
Haylett, J. and Johnson, P., "Comparison of Measurement Methods for Evaluating Displacement of Commercial Vehicle Seats," SAE Technical Paper 2019-01-1481, 2019, https://doi.org/10.4271/2019-01-1481.Data Sets - Support Documents
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References
- Griffin , M.J. Discomfort from Feeling Vehicle Vibration Vehicle System Dynamics 45 7-8 679 698 2007
- Gunston , T.P. , Rebelle , J. , and Griffin , M.J. A Comparison of Two Methods of Simulating Seat Suspension Dynamic Performance Journal of Sound and Vibration 278 1-2 117 134 2004
- Shurpali , M. and Mullinix , L. An Approach for Validation of Suspension Seat for Ride Comfort using Multi-Body Dynamics SAE Technical Paper 2011-01-0434 2011 10.4271/2011-01-0434
- Jin , A. , Zhang , W. , Wang , S. , Yang , Y. et al. Modeling Air-Spring Suspension System of the Truck Driver Seat SAE Int. J. Commer. Veh. 7 1 157 162 2014 10.4271/2014-01-0846
- ISO 7096, Standard 2000