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2?1.???????????????????????????????????
?????c ???????????????????????????????????????????????????????????????????
?????d ????????????????????????????????????????????????????????????????
?
c)??????????????????????????
?????????;
d)????????????????
? ????????.
2?2????????????,?????????????????????
e?
???
a)??????????? ?????????????????????
b)?????????
C??????????? ?????????????2??????????????? d)??????????????????????????
?????????????????
2-3??????????????????,?????????????????????
??? ?????????????
3?1????????????????????????
???
??P12?A? ??P23? P24??B?
??P34?C? P14? P13????????
??P23? P13??B? ???
??P14? P24??D?
3-5??????-????????????????1???3?????1 /?3?
???????????????13?
3-6???????????r
?????1 ?50mm?lOA?22mm?lAC?80mm??1?90????????10rad/s?????????????????2?????2?
????????????????12????1AP12??2CP12? ????????AP12????AP12? x? ?OP12?(222?x2)1/2
BP12????(222
?x2)1/2?CP12?80?x
? P12AO?? P12BC ???x?????(222?x2)1/2??(222?x2)1/2/(80?x)
???x?37.4 ???????2??1AP12?CP12?4.675rad/m
???
?-?????-???????????????????????????????????????m1=10kg?r1=100mm?m2=8kg?r2=150mm?m3=7kg?r3=200mm?m4=5kg?r4=100mm?????????????
??????????????m1r1=1000kgmm
m2r
2=1200kgmm
m3r3=1400kgmm m4r4=500kgmm
????????????????????????mere???????????
????????????????????mere?4020=800kg/mm?
???x??60o???????????
?mere????????re?100mm??me?8kg?
??mere?????????????800kg/mm?
6-3????-????????????????????????????????????O???????d1=40mm?r1=120mm?d2=60mm?r2=100mm?d3=50mm?r3=110mm?d4=70mm?r4=90mm??????????????????
???????????????????????
m1r1=?(d1/2) 2120=48000?? m2r2=?(d2/2)2100=90000?
m3r3=?(d3/2)2110=68750?? m4r4=?(d4/2)290=108450?
????????????????
????????mere=43?????=86000?
????re=100mm??x??????46o???????????d5=?3440?1/2mm?????
6-4 ???????????????m1=10kg?m2=15kg?m3=20kg?m4=10kg???????????r1=300mm?r2=r4=150mm?r3=100mm????????????????????l1=l2=l3=200mm?????????????1?120??2?60??3?90??4?30????????I?II??????mI?mII???????400mm???mI?mII??????? ????
?-?????-?????????????????l1=75mm?l2=300mm?l3=150mm???????m1=0?3kg?m2=0?6kg ?m3=0?9kg??????lAS1=25mm?lBS2=100mm?lBS3=100mm?
??????????????????A?B?C?D???
???????????????me1?me3?????????????????????re1=re3=75mm??me1?me3?????
?????m1???????? m2?B?C????
AS1=500?3/75=0?2kg
mBS1=250?3/75=0?1kg
m3?CD???? CS3=1000?9/150=0?6kg
mDS3=500?9/150=0?3kg
?mAAS1=0?2kg
mB= mBS1mBS2???5kg
mC= mCS2?mCS3???8kg
mD=mDS2=0?3kg
2)me1re1=mBlAB e1=0?575/75=0?5kg
me3re3=mClCD e3=0?8150/75=16kg
?-??????-??????????????????lAB=100mm?lBC=300mm?????????S1?S2??????lAS1=100mm=lAS2???????m3=0?4kg?????????????????????m1?????m2????
???m2lBC=m3lBS2 m2=m3lBS2/lBC=0?133kg
mB=m2+m3=0?533kg
m1lAB=mBlAS11=0?533kg
???
8?1????????????ABCD??lBC=50mm?lCD=35mm?lAD=30mm???????? ??????????????????AB?????lAB??????
?????????????????lAB??????
?????????????????lAB??????
???1????????????AB?????AB??????????BC?????50?
?lAB+lBC?lAD+lCD
?lAB?15
2?????????????????????????????????????AD????????????AD???????????BC??????AB??
?? ?AB??????lAD+lAB?lBC+lCD
?lAB?55????lAB???
?? ?????????lAB+lBC?lAB+lCD
?lAB?45????lAB???
?????????????????????????
45?lAB?50
?? ???????????????????????????????????????????????
1) ?AB?????????BC?
?lAB+lBC?lCD+lAD
?lAB?15
2??AD????BC????lAD+lAB?lBC+lCD
?lAB?45
AB????lAD+lAB?lBC+lCD lAB?55
lAB?lAD+lCD+lBC lAB?115
?????AB??????
15?lAB?45 ??55?lAB?115
8-3??????????????????????1?60o??1?30o??2?90o??2?50o??3?120o??3?80o?????????lAD=100mm?lCD=100mm????????????????????
?????????????
?????????
1???a?????????????????????????????1?????A??????????A????2???3???????????4???????????????????????????????????????????????????????
? 1??????l???????????b?? 2??????????????
? a? ??b???n?3?pl?4?ph?1?p??0?F??0 ??F?3n?(2pl?ph?p?)?F??3?3?(2?4?1?0)?0?0
???????????????????3?4???5????B?C?D?????????????????????????
? b?
3?????????c??
????????
?????????????????????????????????????????????????????????????????????????c???????????
? c1?? c2?
2????????????????????????
?a?
??n?3?pl?4?ph?0?F?3n?2pl?ph?1
? b?
??n?4?pl?5?ph?1?F?3n?2pl?ph?1
????????
3????????????????????????????????????????
3?1
?3?1?n?7?pl?10?ph?0?F?3n?2pl?ph?1?C?E?????
3?2
?3?2?n?8?pl?11?ph?1?F?3n?2pl?ph?1??????
????????
3?3 ?3?3?n?9?pl?12?ph?2?F
?3n?2pl?ph?1
4?????????????
????????
??n?10?pl?15?ph?0??n?11?pl?17?ph?0
p??2pl??p?h?3n??2?5?0?3?3?1p??2pl??p?h?3n??2?10?3?6?2
F??0F??0
F?3n?(2pl?ph?p?)?F?F?3n?(2pl?ph?p?)?F?
?3?10?(2?15?0?1)?0?1 ?3?11?(2?17?0?2)?0?1
???E?D?H??????? ???C?F?K???????
5?????????????????????????????????????????????EG???????????????????????????
?1??????????
F?3n?(2pl?ph?p?)?F??3?7?2?10?1
2????AB????? ?????????
???? ? ???
3????EG????? ??????????
????????
?????????????(??)
???
2-1 ????????????????????????????? ??????5~7??
2-2 ???????????????????????????
???????????????????????????????????????????? 2-3 ?????????????????????????????????????????????????
??????12~13??
2-5 ????????????????????? ??????15~17??
2-6 ??2-22??????????C?B?D?????????????????????????????????????????
??????????C?B?D?????????????????????????????????????????
2-7 ??????????????????????????????????????????? ??????18~19??
2-8 ????????????????"??????????????? ??????20~21??
2-11 ???????????????????????????????1????? A??????????A????2???3???????????????????????????????????????????????????????
1
??1?????????????? 2??????????????
F=3n-( 2Pl + Ph p )-F=33-(24+1-0)-0=0 ?????????,????????? 3??????
?????????????????????????????????????????????????
?2-13????????????????????1?????A??????2????????3???????C?????4???????????????????????????????????5???????????(1)???????????(2)???????
??(1)????????????????
(2) F=3n-(2p1+ph-p)-F=34-(24+0-0)-1=1
2-14 ??1?????????
1?????????
F=3n-(2Pl + Ph p)-F=35-(27+0-0)-0=1 2???90o ????????
?2-15????????????????????????(???8?????????)????
2
????
2-17
??????????????
???1)??????????????2)?????F?3?7?2?10?1
?a?F=3n-( 2Pl + Php)-F=34-(25+1 -0)-0=1?A??????? ?b?F=3n-(2Pl + Php)-F=37-(28+2-0)-2=1?2?4?????????
?c?p=( 2Pl + Ph )-3n=210+0-36=2,F=3n-(2Pl + Php)-F=311-(217+0-2)-0=1 ?C?F?K ??????????????????
?2-21????????????????????1?5?????????????1?????5?????D????????????????????????1?2?3?4????????????3?E???????5??????????????????????????????????????????????????????????????????????2????B?D????????????(?????????)????????lAB=lAD=90 mm?lBC=lCD=25 mm????????????????????????????
??F=3n-(2p1+pb-p)-F=35-(26+1-0)-1=1
2-23 ????????????????????????????????????????????EG??????????????????????????
3
??1??????
F=3n-(2Pl + Php)-F=37-(210+0-0)-0=1
2???
3?EG???????
II??
II??
II??
III??
2-24 ?????????????????,????????????????????
1?
??1??????
F=3n-(2Pl+Php)-F=35-(26+1-0)-1=1
2??????????????????????????????2??? 3????????3??? 4??????4???
2?
4
??1??????
F=3n-(2Pl+Php)-F=3-(29+1-0)-1=1
2??????????????????????????????b??? 3????????c??? 4??????d???
???
31 ?????????????????????? ??????30~31??
32 ????????????????????????? ??????31??
?3-3??????????????B???vB(?????pb)????????????????????
?3-4 ????????????B????????????????????????????????????????????
(1)????????????(2)???????????????????????????????(3)? (a)??akB2B3=2?2vB2B3??????? ???1)? (a)????????? (b)????
(2)??akB2B3==2?2vB2B3??3?vB2B3??????????????????? (a)?B????????????1?3?4?????vB2B3=0????1???3??????_f=?????????????2=?3=0???????????????? (b)???????????2=?3=0??????????????????? (3)?????3??2?
3-5 ??????????????lAB?30mm,lAC?100mm,lBD?50mm,lDE?40mm?????????1?10rad/s?????????????1?45??????D?E???????????2???
???????
5
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发表于 2019-9-13 23:46:11