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891 - Human comfort analysis in a test environment simulating real work machine vibrations
Marjanen Y., Launis S., Leino S., Kortelainen J.
Abstract
This study was conducted to find out more information about the comfort feeling of a human exposed to high level vibration. This kind of vibration is normally experienced using mobile work machinery. The study was done in a laboratory test bench, which simulated vibration exposures of heavy mobile machinery. Vibration on the test person was measured by four tri-axial acceleration sensors and heart rate equipment. Pressure distribution under the seated person was measured with pressure sensitive foil having multiple sensing points on matrix-like measuring grid. The measurements were also recorded by two video cameras. Result of the video analysis was 3D vibration data for the different marker points on the body, which was then synchronized with the other measurement data for further analysis. The excitations were based on field measurements and included such activities as cultivation, moving in a forest and gravel road. Test subjects evaluated vibration based on a five scale comfort criteria. RMS-values were calculated based on the ISO 2631-1 standard from the floor, seat and head. Human comfort is a sum of many different variables. It is very hard to separate the effect of the different variables and find out individual differences. There is also not enough conclusive evidence to link comfort to certain types of vibration characteristics. To design more innovative vibration control systems more information on comfort feeling is needed. The results of this study showed new insight on how body moves under vibration and what variables affect the comfort level. The results are used later to research and develop more effective vibration control systems and improved human model.
Citation
Marjanen Y.; Launis S.; Leino S.; Kortelainen J.: Human comfort analysis in a test environment simulating real work machine vibrations, CD-ROM Proceedings of the Thirtheenth International Congress on Sound and Vibration (ICSV13), July 2-6, 2006, Vienna, Austria, Eds.: Eberhardsteiner, J.; Mang, H.A.; Waubke, H., Publisher: Vienna University of Technology, Austria, ISBN: 3-9501554-5-7