编制:陈编制:陈晓晓勇勇MACHINERYDESIGNMACHINERYDESIGNChenChenxiao-yongxiao-yongMechanicalEngineeringMechanicalEngineeringDepartment,SWUSTDepartment,SWUST.2003.10.12003.10.1 图示,该机构为图示,该机构为 机构。机构。(a a)双曲柄双曲柄 (b b)曲柄摇杆曲柄摇杆 (c c)双摇杆双摇杆 50120150150解题指导解题指导 图示,该机构的活动构件数图示,该机构的活动构件数n n、低副数、低副数P PL L、高副数高副数P PH H和机构自由度和机构自由度F F分别为分别为_。(a a)n=4n=4,P PL L=7=7,P PH H=1=1,F=1 F=1 (b b)n=5n=5,P PL L=6=6,P PH H=0=0,F=1F=1 (c c)n=5n=5,P PL L=7=7,P PH H=0=0,F=1F=1 (d d)n=6n=6,P PL L=7=7,P PH H=0=0,F=2F=2ABDC为了提高受轴向变载荷作用的受