Chapter 8 Dynamics of Vehicles Section2 Force Analysis of automobiles 1.The External Forces the Vehicle Bear When Uphill With Acceleration Figure 8-2 The free-body diagram of the automobile when uphill with acceleration G:Gravity of the automobile; a:road grade; Tfl,Tf2:rolling resistance moment acting on the front and rare wheels; Tji,Ti2:inertia resisting moment acting on the front and rare wheels; Tz,T2:normal counterforce of the ground acting on the front and rare wheels; Fx1,F:tangential counterforce of the ground acting on the front and rare wheels; hg:barycentre height of the automobile; hw:height of center of air pressure L:wheel base; a,b:the distances between the automobile barycentre and front and rare wheels; 机械电子工程二 Automobile and Tractor Northwest A&F University Automobile and Tractor Northwest A&F University Chapter 8 Dynamics of Vehicles 1. The External Forces the Vehicle Bear When Uphill With Acceleration Figure 8-2 The free-body diagram of the automobile when uphill with acceleration G: Gravity of the automobile; α: road grade; Tf1,Tf2: rolling resistance moment acting on the front and rare wheels; Tji, Tj2: inertia resisting moment acting on the front and rare wheels; Tz1, Tz2: normal counterforce of the ground acting on the front and rare wheels; Fx1, Fx2: tangential counterforce of the ground acting on the front and rare wheels; hg: barycentre height of the automobile; hw: height of center of air pressure ; L: wheel base ; a,b: the distances between the automobile barycentre and front and rare wheels; Section2 Force Analysis of automobiles