Country road and field surface profiles acquisition,modelling and synthetic realisation for evaluating fatigue life of agricultural machinery |
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| Institution: | 1. University of Hohenheim, Institute of Agricultural Engineering, Garbenstr. 9, D-70599 Stuttgart, Germany;2. University of California, Davis, Department of Biological and Agricultural Engineering, One Shields Ave., Davis, CA 95616, USA;1. Institute of Agricultural Engineering and Safety, Aleksandras Stulginskis University, Lithuania;2. Institute of Agricultural and Food Sciences, Aleksandras Stulginskis University, Lithuania;1. Department of Mechanical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 16419, Republic of Korea;2. R&D Center, LS Mtron Ltd., 124, Gongdan-ro, Gunpo-si, Gyeonggi-do 15847, Republic of Korea;1. Mechanical Engineering Department, KU Leuven, 3001 Leuven, Belgium;2. Mechanical and Industrial Engineering Department, University of Minnesota Duluth, 55812 Duluth, Minnesota, USA;1. BMW AG, Petuelring 130, 80788 Munich, Germany;2. Engineering Design and Product Reliability, Berlin Institute of Technology, Straße des 17. Juni 135, 10623 Berlin, Germany |
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| Abstract: | Fatigue life of agricultural machinery is strongly affected by the surfaces that these machines operate on. In the present paper a sensor-frame was developed to acquire road and field profiles in absolute geo-referenced coordinates. The sensor-frame was validated by measuring discrete trapezoidal bumps with known dimensions resulting in a root mean squared (RMS) error of 6–8 mm. Profiles were acquired from a country road and from a mowed grass field. Using the quarter-car vehicle model, the movement of an agricultural vehicle was simulated for various speeds. The resulted vertical loads were rainflow-counted and the accumulated fatigue pseudo damage was calculated using Palmgren–Miner linear rule. Based on the derived Power Spectrum Density (PSD), the profiles were classified according to ISO 8608 standard. Two methodologies were followed to model and create a number of synthetic realisations for each profile: Direct Spectrum Estimate (DSE) and ISO based modelling. Simulating the produced synthetic profiles with the quarter-car vehicle model, the corresponding pseudo damage was calculated. The accumulated damages from the DSE models were closer to the corresponding ones from the measured profiles. ISO based models could not model the profile irregularities, which proved to contribute the largest part of the accumulated fatigue damage. |
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| Keywords: | Fatigue life Road and field profiles Quarter-car vehicle model Accumulated damage ISO 8608 Synthetic profile realisation |
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