In addition, the absolute values of the aerodynamic resistances of the upper and lower arms under the knuckle-upstream operating conditions are greater than those under the knuckle-downstream operating conditions. The change of diameter has a great influence on the aerodynamic lift forces of the upper and lower arms and a small effect on the aerodynamic resistances. The aerodynamic resistance of the bar of the lower arm accounts for 10%-25% of that of the lower arm, and the aerodynamic lift force accounts for 43%-68% of that of the lower arm under the two conditions. The aerodynamic resistance of the bar of the upper arm only accounts for 3%-10% of that of the upper arm, and the aerodynamic lift force accounts for 26%-55% of that of the upper arm under both the knuckle-downstream and knuckle-upstream operating conditions. Moreover, both the aerodynamic lift force of the upper arm and the aerodynamic uplift of the pantograph lessens with the increase of the upper arm diameter and raises with the increase of the lower arm diameter under the knuckle-upstream operating conditions. Research results show that both the aerodynamic lift force of the upper arm and the aerodynamic uplift force of the pantograph are larger with the rise of the upper arm diameter and are smaller with the rise of the lower arm diameter under the knuckle-downstream operating conditions, but the effect of the lower arm diameter on the aerodynamic uplift force of the pantograph is small. The aerodynamic uplift forces of pantographs were calculated by using the multi-body dynamics method, and the effects of the upper and lower arm diameters on the aerodynamic performances and aerodynamic uplift forces of pantographs were studied from the perspective of the aerodynamic force and flow field characteristics. OL10166089W Pages 258 Pdf_module_version 0.0.20 Ppi 300 Republisher_date 20201125170733 Republisher_operator Republisher_time 701 Scandate 20201123195430 Scanner Scanningcenter china Scribe3_search_catalog isbn Scribe3_search_id 9787205029357 Tts_version 2.The pantograph models for the upper arms with seven different diameters and those for the lower arms with seven different diameters were built, and the aerodynamic numerical simulations of pantographs were carried out. Access-restricted-item true Addeddate 08:36:30 Bookplateleaf 0002 Boxid IA1924508 Camera Sony Alpha-A6300 (Control) Collection_set printdisabled External-identifier
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