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Tribodynamics of hydraulic actuated clutch system for engine-downsizing in heavy duty off-highway vehicles
Engine downsizing is desired for modern heavy-duty vehicles to enhance fuel economy and reduce emissions. However, the smaller engines usually cannot overcome the parasitic loads during engine start-up. A new clutch system is designed to disconnect the downsized engine from the parasitic losses prio...
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| Main Authors: | , , , , , |
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| Format: | Default Article |
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2018
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| Online Access: | https://hdl.handle.net/2134/32161 |
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| _version_ | 1818169892698849280 |
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| author | Nader Dolatabadi Ramin Rahmani Stephanos Theodossiades Homer Rahnejat Guy Blundell Guillaume Bernard |
| author_facet | Nader Dolatabadi Ramin Rahmani Stephanos Theodossiades Homer Rahnejat Guy Blundell Guillaume Bernard |
| author_sort | Nader Dolatabadi (1259523) |
| collection | Figshare |
| description | Engine downsizing is desired for modern heavy-duty vehicles to enhance fuel economy and reduce emissions. However, the smaller engines usually cannot overcome the parasitic loads during engine start-up. A new clutch system is designed to disconnect the downsized engine from the parasitic losses prior to the idling speed. A multi-scale, multi-physics model is developed to study the clutch system. Multi-body dynamics is used to study the combined translational–rotational motions of the clutch components. A micro-scale contact model is incorporated to represent the frictional characteristics of the sliding surfaces. Although the clutch is designed for dry contact operation, leakage of actuating hydraulic fluid can affect the interfacial frictional characteristics. These are integrated into the multi-body dynamic analysis through tribometric studies of partially wetted surfaces using fresh and shear-degraded lubricants. Multi-scale simulations include sensitivity analysis of key operating parameters, such as contact pressure. This multi-physics approach is not hitherto reported in the literature. The study shows the importance of adhesion in dry clutch engagement, enabling full torque capacity. The same is also noted for any leakage of significantly shear-degraded lubricant into the clutch interfaces. However, the ingression of fresh lubricant into the contact is found to reduce the clutch torque capacity. |
| format | Default Article |
| id | rr-article-9567989 |
| institution | Loughborough University |
| publishDate | 2018 |
| record_format | Figshare |
| spelling | rr-article-95679892018-02-25T00:00:00Z Tribodynamics of hydraulic actuated clutch system for engine-downsizing in heavy duty off-highway vehicles Nader Dolatabadi (1259523) Ramin Rahmani (1250418) Stephanos Theodossiades (1247457) Homer Rahnejat (1247550) Guy Blundell (7214297) Guillaume Bernard (2626852) Mechanical engineering not elsewhere classified Multi-disc clutch system Multi-scale tribo-multi-body dynamic analysis Clutch interfacial frictional characteristics, tribometry Heavy duty off-highway vehicles Mechanical Engineering not elsewhere classified Mechanical Engineering Engine downsizing is desired for modern heavy-duty vehicles to enhance fuel economy and reduce emissions. However, the smaller engines usually cannot overcome the parasitic loads during engine start-up. A new clutch system is designed to disconnect the downsized engine from the parasitic losses prior to the idling speed. A multi-scale, multi-physics model is developed to study the clutch system. Multi-body dynamics is used to study the combined translational–rotational motions of the clutch components. A micro-scale contact model is incorporated to represent the frictional characteristics of the sliding surfaces. Although the clutch is designed for dry contact operation, leakage of actuating hydraulic fluid can affect the interfacial frictional characteristics. These are integrated into the multi-body dynamic analysis through tribometric studies of partially wetted surfaces using fresh and shear-degraded lubricants. Multi-scale simulations include sensitivity analysis of key operating parameters, such as contact pressure. This multi-physics approach is not hitherto reported in the literature. The study shows the importance of adhesion in dry clutch engagement, enabling full torque capacity. The same is also noted for any leakage of significantly shear-degraded lubricant into the clutch interfaces. However, the ingression of fresh lubricant into the contact is found to reduce the clutch torque capacity. 2018-02-25T00:00:00Z Text Journal contribution 2134/32161 https://figshare.com/articles/journal_contribution/Tribodynamics_of_hydraulic_actuated_clutch_system_for_engine-downsizing_in_heavy_duty_off-highway_vehicles/9567989 CC BY 4.0 |
| spellingShingle | Mechanical engineering not elsewhere classified Multi-disc clutch system Multi-scale tribo-multi-body dynamic analysis Clutch interfacial frictional characteristics, tribometry Heavy duty off-highway vehicles Mechanical Engineering not elsewhere classified Mechanical Engineering Nader Dolatabadi Ramin Rahmani Stephanos Theodossiades Homer Rahnejat Guy Blundell Guillaume Bernard Tribodynamics of hydraulic actuated clutch system for engine-downsizing in heavy duty off-highway vehicles |
| title | Tribodynamics of hydraulic actuated clutch system for engine-downsizing in heavy duty off-highway vehicles |
| title_full | Tribodynamics of hydraulic actuated clutch system for engine-downsizing in heavy duty off-highway vehicles |
| title_fullStr | Tribodynamics of hydraulic actuated clutch system for engine-downsizing in heavy duty off-highway vehicles |
| title_full_unstemmed | Tribodynamics of hydraulic actuated clutch system for engine-downsizing in heavy duty off-highway vehicles |
| title_short | Tribodynamics of hydraulic actuated clutch system for engine-downsizing in heavy duty off-highway vehicles |
| title_sort | tribodynamics of hydraulic actuated clutch system for engine-downsizing in heavy duty off-highway vehicles |
| topic | Mechanical engineering not elsewhere classified Multi-disc clutch system Multi-scale tribo-multi-body dynamic analysis Clutch interfacial frictional characteristics, tribometry Heavy duty off-highway vehicles Mechanical Engineering not elsewhere classified Mechanical Engineering |
| url | https://hdl.handle.net/2134/32161 |