1. Trang chủ
  2. » Kỹ Thuật - Công Nghệ

Tyre and Vehicle Dynamics Part 15 pps

40 113 0

Đang tải... (xem toàn văn)

Tài liệu hạn chế xem trước, để xem đầy đủ mời bạn chọn Tải xuống

THÔNG TIN TÀI LIỆU

Thông tin cơ bản

Tiêu đề Tyre and Vehicle Dynamics Part 15 pps
Trường học University of Technology Sydney
Chuyên ngành Vehicle Dynamics
Thể loại lecture notes
Năm xuất bản 2024
Thành phố Sydney
Định dạng
Số trang 40
Dung lượng 875,73 KB

Các công cụ chuyển đổi và chỉnh sửa cho tài liệu này

Nội dung

δ 30 40 handling curve speed lines -1 -0.5 0 0.5 1 1.5 equilibrium curve LJ 7\UHVLGHIRUFHGLDJUDPVDWDVHULHVRIFDPEHUDQJOHV 6LPSOLILHGVLWXDWLRQZKHUH ZKHHOORDGVUHPDLQXQFKDQJHG QRDLUGUDJ DQGW

Trang 2

))

9 

0

\

Trang 3

 02725&<&/('<1$0,&6

1RQ/LQHDU$QDO\VLVRI6WHDG\6WDWH&RUQHULQJ

,QWKLVVHFWLRQWKHVRFDOOHGKDQGOLQJGLDJUDPZLOOEHHVWDEOLVKHGIRUWKHPRWRUF\FOH,QWKDWGLDJUDPWKHYDULDWLRQRIWKH JURXQG VWHHUDQJOHFDQEHIRXQGDVDIXQFWLRQRIWKHODWHUDODFFHOHUDWLRQIRUDJLYHQVSHHGRIWUDYHORUIRUDVHOHFWHGYDOXH RI SDWK FXUYDWXUH $V DQ DGGLWLRQDO LQIRUPDWLRQ WKH YDULDWLRQ RI WKHDVVRFLDWHG VWHHU WRUTXH ZLOO JLYHQ 7KH GLDJUDP LV VLPLODU WR WKH KDQGOLQJGLDJUDPVHVWDEOLVKHGIRUWKHPRWRUFDULQ&KDSWHU7KHUHODWLYHO\ODUJHUROODQJOHFDOOVIRUVSHFLDODWWHQWLRQWRDVVHVVWKHHTXLOLEULXPFRQGLWLRQIRUWKHIURQWDQGIRUWKHUHDUW\UH

$6LPSOH$SSUR[LPDWLRQ

7RLQWURGXFHWKHSUREOHPZHZLOODJDLQILUVWQHJOHFWDOOWKHW\UHPRPHQWVDQGWKHJ\URVFRSLFFRXSOHVDVZHOODVWKHDLUGUDJ:HWKHQKDYHWKHHTXLOLEULXPFRQGLWLRQVVWDWHGEHIRUH



N ' O

5 % & 

)LJXUHVKRZVWKHQRUPDOLVHGVLGHIRUFHFKDUDFWHULVWLFVDFFRUGLQJWRWKH

Trang 4

δ

30 40

handling curve

speed lines

-1 -0.5 0 0.5 1 1.5

equilibrium curve

)LJ 7\UHVLGHIRUFHGLDJUDPVDWDVHULHVRIFDPEHUDQJOHV 6LPSOLILHGVLWXDWLRQZKHUH

ZKHHOORDGVUHPDLQXQFKDQJHG QRDLUGUDJ DQGW\UHPRPHQWVDQGJ\URVFRSLF FRXSOHVDUHOHIWRXWRIFRQVLGHUDWLRQ(TXLOLEULXPFXUYHVKDYHEHHQVKRZQZKHUH WKHW\UHVLGHIRUFHDJUHHVZLWKWKHUROODQJOH  

EDVHOLQHFRQILJXUDWLRQWRJHWKHUZLWKWKHHTXLOLEULXPFXUYHVZKHUHWKHFDPEHUDQJOHHTXDOVWKHUROODQJOHEHORQJLQJWRWKHVLGHIRUFH,Q)LJWKHUHVXOWLQJKDQGOLQJ FXUYH ZLWK VSHHG OLQHV IRUPLQJ WKH KDQGOLQJ GLDJUDP KDV EHHQSUHVHQWHG7KHVSHHGOLQHVLQGLFDWHWKHUHODWLRQVKLSEHWZHHQODWHUDODFFHOHUDWLRQ

Trang 5

,QWKHILJXUHWKHHTXLOLEULXPFXUYHVRI)LJKDYHEHHQUHSURGXFHG%\KRUL]RQWDO VXEWUDFWLRQ RI WKHVH FXUYHV WKH KDQGOLQJ FXUYH LV REWDLQHG 7KHKRUL]RQWDOGLVWDQFHEHWZHHQVHOHFWHGVSHHGOLQHDQGWKHKDQGOLQJFXUYHHTXDOVWKHJURXQGVWHHUDQJOH7KHVORSHRIWKHKDQGOLQJFXUYHZLWKUHVSHFWWRWKHYHUWLFDOD[LVDW]HURODWHUDODFFHOHUDWLRQFRUUHVSRQGVWRWKHXQGHUVWHHUFRHIILFLHQWLQWKHOLQHDUWKHRU\   M rM D\ J DWFRQVWDQWO5%\XVLQJ(T  ZLWKWZLVWDQJOHQHJOHFWHGDQGVWHHUDQJOHDVVXPHGVPDOOZLWKUHVSHFWWRWKHUROODQJOHZHILQGWKHDFWXDOVWHHUDQJOH

7RVHWXSWKHHTXDWLRQVIRUWKHVWHDG\VWDWHFRUQHULQJVLWXDWLRQZHQHHGWRFRQVLGHUWKHFRQGLWLRQVIRUHTXLOLEULXPLQWKHGLUHFWLRQVRIWKH[\DQG]D[HVDQGDERXWWKHVHWKUHHD[HVDQGIRUWKHVWHHUWRUTXHDERXWWKHVWHHULQJD[LV:HZLOOGRWKLVIRUWKHJHQHUDOFDVHZLWKDLUGUDJLQWURGXFHGDQGZLWKEUDNLQJRUGULYLQJIRUFHVDFWLQJRQWKHIURQWDQGUHDUZKHHOVDQGSRVVLEO\ZLWKDJLYHQVLGHZD\VVKLIWRIWKHFHQWUHRIJUDYLW\7KHWZLVWDQJOH LVQHJOHFWHGDQGWKHOHDQDQJOHnULVGLVUHJDUGHGVLQFHDWVWHDG\VWDWHWXUQLQJLWVHIIHFWLVVLPLODUWRWKDWRIWKHFJODWHUDORIIVHW7KHVWHHUDQJOH LVFRQVLGHUHGVPDOOZLWKUHVSHFWWRWKHUROODQJOH

$OVRWKHZKHHOVOLSDQJOHVDUHDVVXPHGWREHUHODWLYHO\VPDOO VPDOOHUWKDQFD

GHJUHHV 

(TXLOLEULXP&RQGLWLRQVIRUWKH&RPSOH[&RQILJXUDWLRQ

7KHFRQGLWLRQRIHTXLOLEULXPLQORQJLWXGLQDOGLUHFWLRQFDQEHPHWE\PDNLQJWKHGULYLQJIRUFHHTXDOWRWKHDLUGUDJIRUFH7KLVPHDQVWKDW)[DFF RU)[ )G :KHQ D GLIIHUHQW GULYLQJ IRUFH RU ZKHQ EUDNLQJ IRUFHV DUH DSSOLHGHTXLOLEULXPFDQRQO\EHDVVXUHG D[  ZKHQWKHYHKLFOHUXQVRQDQXSZDUGRUGRZQZDUGVORSH,IWKLVLVQRWWKHFDVHZHPD\VSHDNRIDTXDVLHTXLOLEULXPVLWXDWLRQLQWKHORQJLWXGLQDOGLUHFWLRQ:HKDYHWKHHTXDWLRQ ZKHUHWKHVPDOOORQJLWXGLQDOFRPSRQHQWRIWKHVLGHIRUFH)\ rKDVEHHQQHJOHFWHG 

Trang 6

:LWK0\DLQWURGXFHGIRUDEEUHYLDWLRQ

  EHFRPHGRPLQDQW

6 %UDNLQJFDXVHVWKHJURXQGVWHHUDQJOHWREHFRPHODUJHUZKLOHWKHVWHHUWRUTXHFKDQJHV WRZDUGV WKH QHJDWLYH GLUHFWLRQ HVSHFLDOO\ DW KLJKHU ODWHUDODFFHOHUDWLRQV )LJQRWHWKHFKDQJHLQVFDOHIRUWKHVWHHUWRUTXH 

6 +DUGEUDNLQJ )LJ WHQGVWRFKDQJHWKHVORSHRIWKHKDQGOLQJFXUYHLQWRXQGHUVWHHU DW ODUJH ODWHUDO DFFHOHUDWLRQV $OVR WKH PD[LPXP ODWHUDODFFHOHUDWLRQWKDWFDQEHUHDFKHGLVUHGXFHG/DUJHUVWHHUDQJOHVDULVHLQWKHKLJKHUD\UDQJHRIRSHUDWLRQ$OVRWKHVWHHUWRUTXHLQFUHDVHVFRQVLGHUDEO\LQPDJQLWXGH

Trang 10

PPU\PU PK )]ROUHVSHFWLYHO\ $WDFHUWDLQOHYHORIWKHODWHUDODFFHOHUDWLRQWKHVWHHUWRUTXHUHDFKHVDPLQLPXP

Trang 12

bounce

rear wobble

pitch bounce weave

Trang 13

 02725&<&/('<1$0,&6

DORQJDFLUFXODUSDWKDWDQDYHUDJHUROODQJOHRIRQHUDGLDQ IURP.RHQHQ¶VZRUN  7KH ERXQFH SLWFK DQG KRS PRGHV DSSHDU WR EHFRPH DOPRVW VSHHGLQGHSHQGHQWDWYDQLVKLQJUROODQJOH,QDFXUYHDOOWKHPRGHVGRGHSHQGRQWKHVSHHGRIWUDYHO,QWKHVKDUSKLJKODWHUDODFFHOHUDWLRQFXUYLQJPRWLRQFRQVLGHUHGWKHFRUQHULQJZHDYHURRWORFLDSSHDUWREHVKLIWHGFRPSOHWHO\WRWKHULJKWKDQGVLGHRIWKHLPDJLQDU\D[LV7KHZREEOHPRGHLVGHVWDELOLVHGDVZHOO7KHKLJKHUIUHTXHQF\WZLVWPRGH IOH[LEOHIUDPHWRUVLRQPRGH NHHSVDQLQGLYLGXDOFRXUVH

0RWRUF\FOH0DJLF)RUPXOD7\UH0RGHO

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

$QRWKHUIHDWXUHWKDWGLIIHUVIURPWKHRULJLQDOPRGHOFRQFHUQVWKHFUHDWLRQRIWKHDOLJQLQJWRUTXH7KHSDUW0¶LVQRZREWDLQHGE\PXOWLSO\LQJWKHSQHXPDWLF]WUDLOZLWKWKHVLGHIRUFHWKDWLVDWWULEXWHGWRWKHVLGHVOLSDQGQRWWRWKHFDPEHUDQJOH LQGLUHFWO\WKURXJKFDPEHULQGXFHGVLGHVOLS 7KLVPD\HVSHFLDOO\DWODUJHFDPEHUDQJOHVEHFORVHUWRWKHDFWXDOPHFKDQLVP7KLVSDUWRIWKHVLGHIRUFHGHQRWHGZLWK)\  LVREWDLQHGIURPWKHVDPH(TV ( E\VHWWLQJ  ([DPSOHV RI FRPSXWHG FKDUDFWHULVWLFV FRPSDUHG ZLWK H[SHULPHQWDOO\DVVHVVHGFXUYHVIRUERWKSXUHVOLSDWYDULRXVFDPEHUDQJOHVDQGFRPELQHGVOLSFRQGLWLRQVDUHSUHVHQWHGLQ6HFWLRQ)LJV

Trang 14

γγ



Trang 15

)\R' '\VLQ>&\DUFWDQ^%\ \&(\ %\ \& DUFWDQ %\ \ ...



Trang 15< /span>

)\R'' ''\VLQ>&\DUFWDQ^%\... 4

δ

30 40

handling curve

speed lines

-1 -0.5 0.5 1.5

equilibrium

Ngày đăng: 11/08/2014, 06:21

TỪ KHÓA LIÊN QUAN