Vector graphical analysis method Characteristics of Velocity polygon: 1)Velocity of p equals zero.Velocities from p are absolute velocity. A 2)Edges of velocity image triangle are B velocity differences. 3)Velocity image triangle is similar to the link a ABC.Each point of the link has an image in Velocity image triangle. p Vector graphical analysis method EX3-Acc 7入 Knowns:and direction of ae aB=aa+前BA+aA Mag:?√o2aa? A Dire:√√B→A⊥BA Select a scale ua m/s2/mm, p' Draw p'a'from p',let a=uap'a' then:ae=μapb' b aBA=uab”b' direction:b”-→b' b” a agA=μab'a'Dire: a'-b' 88 a p A C B Vector graphical analysis method b c Characteristics of Velocity polygon: 1) Velocity of p equals zero. Velocities from p are absolute velocity. 2) Edges of velocity image triangle are velocity differences. 3) Velocity image triangle is similar to the link ABC. Each point of the link has an image in Velocity image triangle. Vector graphical analysis method EX3-Acc b’ B A C then：aB＝μap’ b’ Select a scaleμa m/s2/mm， Draw p’a’ from p’ , let aA＝μap’ a’ b” Knowns： ωand direction of aB aB＝aA + an BA+ at BA at BA＝μab”b’ direction: b” → b’ aBA＝μab’ a’ Dire: a’ →b’ Mag： Dire： ? ⊥BA ? √ √ √ B→A ω2lAB aA aB a’ p’