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

Tyre and Vehicle Dynamics part 8 ppt

40 203 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 8 PPT
Trường học University of Example
Chuyên ngành Vehicle Dynamics
Thể loại Lecture presentation
Năm xuất bản Unknown
Thành phố Unknown
Định dạng
Số trang 40
Dung lượng 1,18 MB

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

Nội dung

6LQFHZHKDYHKHUHDG\QDPLFPRGHOH[WHQVLRQWKDWDOORZVWKHXVHRIH[LVWLQJNLQHPDWLF PDVVOHVV PRGHOVZHKDYHEHHQDEOHWRLQYHVWLJDWHWKHHIIHFWRIW\UHLQHUWLDRQWKHVHPRGHOV+RZHYHUIRUWKHVDNHRIVLPSOLFLW\WKHVHPR

Trang 2

20m/s 10

10 0

Trang 3

4 8

5

8 0.5

20

40 64

1

2 4 8 16

8 16

32 32 32

16 8 11

200 128

-1

1

Re Im

)\HT

α

&)ψ 8

Re 1

24 64 64

1 2 8

96

8 16

32 128

32 24 64

-1

9  [m/s]

9  [m/s]

radial-ply bias-ply

WKHRU\

radial-ply bias-ply

1.1 Hz 4.0 Hz 7.8 Hz

0]HTψ

)\HTψ

30 20 10 5 2.5

304020 15 10

50

30 40 20

15 10

30 40

10

50

15 20 30

20 10 5 2.5

5

20

15 10

30

40

0 0 0

30 20 10 5

40 20 15

10

50

30 4020

15

10

50

30 40 10

50

15 20 2030

10 5

Trang 4

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

7RIXUWKHUGHYHORSPDWKHPDWLFDOPRGHOVWKDWFDQEHXVHGXQGHUFRQGLWLRQVWKDWLQFOXGHVKRUWZDYHOHQJWKVKLJKHUIUHTXHQFLHVDQGODUJH FRPELQHG VOLSDGLIIHUHQWURXWHDSSHDUVWREHPRUHSURPLVLQJ7KHDGRSWHGSULQFLSOHLVVHSDUDWHPRGHOOLQJRIWKHIOH[LEOHEHOWZLWKFDUFDVVDQGWKHFRQWDFWSDWFKZLWKLWVWUDQVLHQWVOLSSURSHUWLHV7KHWKHRU\RIWKHQRQVWHDG\VWDWHUROOLQJDQGVOLSSLQJSURSHUWLHVRIWKHEUXVKPRGHOKHOSVLQWKLVPRGHOOLQJHIIRUW,Q&KDSWHUWKLVDGYDQFHGPRGHOZLOOEHGLVFXVVHG

)RU OHVV GHPDQGLQJ FDVHV ODUJH ZDYHOHQJWK ORZ IUHTXHQF\  WKH VWUDLJKWWDQJHQWRUVLQJOHSRLQWFRQWDFWPRGHOVPD\EHHPSOR\HG6XFKPRGHOVPD\EHXVHGLQFRPELQDWLRQZLWKWKHDSSUR[LPDWHG\QDPLFH[WHQVLRQWKDWDFFRXQWVIRUWKHJ\URVFRSOHFRXSOHGXHWRWKHODWHUDOGHIOHFWLRQYHORFLW\)XUWKHUPRUHWKHVHVLPSOHPRGHOVFDQEHHDVLO\DGDSWHGWRFRYHUODUJHVOLSQRQOLQHDUEHKDYLRXUFI

&)\Y&KDSWHULVGHYRWHGWRWKHWUHDWPHQWRIWKHYHU\XVHIXODQGUHODWLYHO\VLPSOHSRVVLEO\QRQOLQHDUVLQJOHFRQWDFWSRLQWWUDQVLHQWVOLSPRGHOV:LWKWKDWVLQJOHSRLQWFRQWDFWPRGHOWKHSUREOHPRIFRUQHULQJ DQGEUDNLQJ RQXQGXODWHGURDGVXUIDFHVFDQEHPDGHPRUHDFFHVVLEOHIRUYHKLFOHVLPXODWLRQVWXGLHV)LUVWZHZLOODGGUHVVWKLVGLIILFXOWVXEMHFWLQWKHVXEVHTXHQWVHFWLRQXVLQJH[DFWVWULQJPRGHOVZLWKDQGZLWKRXWWUHDGHOHPHQWVZKLFKVKRZVWKHGHHSHUFDXVHRIWKHDVVRFLDWHGORVVLQFRUQHULQJSRZHU

Trang 5

 12167($'<67$7(675,1*%$6('7<5(02'(/6

,QVWXGLHVE\0HWFDOI  3DFHMND 

D' U & 

7KHQXPHULFDOYDOXHVRIWKHSDUDPHWHUVRIWKHV\VWHPXQGHUFRQVLGHUDWLRQDUH

DR' U R' U  A' U V'  DR  ' DR

 ' DR '  F' DR FS' FF  ,Q)LJWKHFDOFXODWHGYDULDWLRQRIFRQWDFWOHQJWKD RYDOFXUYH WKHSDWKRIWKHFRQWDFWSRLQWV ORZHUFXUYH$% DQGWKHFRXUVHRIWKHSRLQWVRIWKHVWULQJDWWKHOHDGLQJDQGWUDLOLQJHGJH $&DQG%& KDYHEHHQLQGLFDWHG7ZRSRVLWLRQVRIWKHW\UHKDYHEHHQGHSLFWHGRQHLQLQWHUYDO,,DQGWKHRWKHULQLQWHUYDO,,,,WLVQHFHVVDU\WKDWWKHFDOFXODWLRQVLQWKHQXPHULFDOLQWHJUDWLRQSURFHVVEH

Trang 10

12167($'<67$7(675,1*%$6('7<5(02'(/6

FDUULHGRXWZLWKJUHDWDFFXUDF\$VPDOOHUURUJLYHVULVHWRDUDSLGEXLOGXSRIGHYLDWLRQVIURPWKHFRUUHFWFRXUVH,QWKHFDVHFRQVLGHUHGDERYHWKHLQWHJUDWLRQWLPHLVOLPLWHGDQGDFFXUDWHUHVXOWVFDQEHREWDLQHG,QFDVHVKRZHYHUZKHUHFRQWLQXRXV FRQWDFW EHWZHHQ W\UH DQG URDG H[LVWV D ORQJ LQWHJUDWLRQ WLPH LVQHHGHGEHIRUHDVWHDG\VWDWHVLWXDWLRQLVDWWDLQHGZKLFKLVGXHWRWKHIDFWWKDWWKHH[DFWLQLWLDOFRQGLWLRQVRIDSHULRGLFORDGLQJF\FOHDUHQRWNQRZQ)RUWKLVVRUWRIVLWXDWLRQWKHH[DFWPHWKRGGHVFULEHGDERYHLVGLIILFXOWWRDSSO\GXHWRVWURQJGULIWRIYF LQSDUWLFXODU

)RUIXUWKHULQYHVWLJDWLRQRIWKHHIIHFWRIDWLPHYDU\LQJORDGZHZLOOWXUQWRDQDSSUR[LPDWHPHWKRGEDVHGRQWKHVWULQJPRGHOZLWKRXWWUHDGHOHPHQWV

$GDSWHG%DUH6WULQJ0RGHO

7KHXVHRIWKLVPRGHOLVPXFKVLPSOHUVLQFHWKHGHIOHFWLRQVDWERWKHGJHVDUHLQGHSHQGHQWRIHDFKRWKHU'ULIWGRHVQRWRFFXULQWKHFDOFXODWLRQSURFHVV,Q)LJWKHGHIOHFWHGPRGHOKDVEHHQVKRZQLQLQWHUYDO,,)RUWKHWKUHHLQWHUYDOVWKHIROORZLQJVHWVRIHTXDWLRQVDSSO\

Trang 11

 12167($'<67$7(675,1*%$6('7<5(02'(/6

\ _

[ _

[

_ [

,QRUGHUWRJHWEHWWHUDJUHHPHQWZHZLOOLQWURGXFHDQRQFRQVWDQWUHOD[DWLRQOHQJWK  ( D WKDWLVDIXQFWLRQRIWKHFRQWDFWOHQJWKDDQGWKXVRIWKHYHUWLFDO

DFFRUGLQJWR(T  )LJXUHSUHVHQWVWKHYDULDWLRQRIUHOD[DWLRQOHQJWKDQGFRQWDFWOHQJWKDVDIXQFWLRQRIWKHYHUWLFDOORDGDVFDOFXODWHGIRUWKHFXUUHQWSDUDPHWHUYDOXHV  

Trang 12

12167($'<67$7(675,1*%$6('7<5(02'(/6

)]])o1

,Q)LJDFRPSDULVRQLVPDGHEHWZHHQWKHUHVXOWVRIWKHWKUHHPRGHOVZLWKRXW WUHDG HOHPHQWV ZLWK WUHDG HOHPHQWV H[DFW  DQG DFFRUGLQJ WR WKH

WKHSDUDPHWHUYDOXHV  7KHDSSUR[LPDWHSDWKRIFRQWDFWSRLQWVVKRZVJRRGDJUHHPHQWZLWKWKHSDWKIRUWKHH[DFWPRGHOZLWKWUHDGHOHPHQWV:KHQWKHWUHDGHOHPHQWVDUHRPLWWHGZHKDYHWKHEDUHVWULQJPRGHOIRUZKLFKWKHSDWKEHFRPHVZLGHUDQGWKHODWHUDOGHIOHFWLRQVJUHDWHU

7KH)RUFHDQG0RPHQW5HVSRQVH

7KHODWHUDOIRUFH)\DQGWKHPRPHQW0]ZKLFKDFWRQWKHW\UHFDQEHDVVHVVHGZLWKJRRGDSSUR[LPDWLRQWKURXJKWKHIROORZLQJVLPSOLILHGIRUPXODH,QWKHLUGHULYDWLRQVZHKDYHUHSODFHGWKHFRQWDFWOLQHE\WKHVWUDLJKWOLQHFRQQHFWLQJWKHEHJLQQLQJDQGHQGSRLQWVRIWKHFRQWDFWOLQH 9RQ6FKOLSSH¶VDSSURDFK )RUWKHPRGHOZLWKWUHDGUXEEHUHOHPHQWVZHREWDLQ

Trang 13

tangent to leading edge

Trang 14

1 2

1 4

2

ρ ρo ρsin(2π Vλ)

1 2

)RUDVHULHVRIDPSOLWXGHV DQGZDYHOHQJWKV WKHYDULDWLRQRIWKHFRUQHULQJÖIRUFHRUUDWKHURIWKHFRUQHULQJVWLIIQHVVKDVEHHQFDOFXODWHG6LQFHGXULQJORVVRIFRQWDFWWKHYHUWLFDOORDGUHPDLQV]HURWKHSHULRGRIWKHWRWDOORDGLQJF\FOHPXVWEHFRPHORQJHULQRUGHUWRNHHSWKHDYHUDJHYHUWLFDOORDGXQFKDQJHG7KLVFKDQJHLQSHULRGKDVEHHQWDNHQLQWRDFFRXQWLQWKHFDOFXODWLRQRIWKHDYHUDJHVLGHIRUFHRUFRUQHULQJVWLIIQHVV&)

)LJXUHVDQGVKRZWKHILQDOUHVXOWRIWKLVLQYHVWLJDWLRQYL]WKH

Trang 15

 12167($'<67$7(675,1*%$6('7<5(02'(/6

FRUQHULQJVWLIIQHVVDYHUDJHGRYHURQHFRPSOHWHORDGLQJF\FOHDVDIXQFWLRQRIWKH

DQGZLWKRXWWUHDGHOHPHQWVWKDWLVZLWKWKHDGDSWHGEDUHVWULQJPRGHODQGZLWKWKHRULJLQDOEDUHVWULQJPRGHO:LWKWKHSDUDPHWHUYDOXHV  DRDQGFS FF

WKHUHOD[DWLRQOHQJWKRIWKHPRUHDGYDQFHGPRGHOZLWKWUHDGHOHPHQWVDWWKHVWDWLF

OHQJWKKDVEHHQWDNHQHTXDOWR  DR

7KH ILJXUHV FOHDUO\ LOOXVWUDWH WKH XQIDYRXUDEOH HIIHFW RI LQFUHDVLQJ WKH

]HURSDWKIUHTXHQF\LVSXUHO\GXHWRWKHQRQOLQHDUYDULDWLRQRIWKHFRUQHULQJVWLIIQHVV&)YHUVXVYHUWLFDOORDG)]VKRZQLQ)LJ FI)LJDQGGLVFXVVLRQRQWKHHIIHFWRIORDGWUDQVIHULQ&KDSWHU)LJ ... 7KLVJURZWKFRQWLQXHVXQWLOWKHVHFRQGLQWHUYDO,,LVUHDFKHGZKHUHJURZWKRIFRQWDFWWDNHVSODFHRQO\DWWKHIURQWDQGDWWKHUHDUORVVRIFRQWDFWRFFXUV)LQDOO\LQWKHWKLUGLQWHUYDO,,,ORVVRIFRQWDFWDWERWKHQGVWDNHVSODFHXQWLOWKHW\UHOHDYHVWKHURDG:KHQWKHW\UHGRHVQRWOHDYHWKHURDGDQDGGLWLRQDOLQWHUYDO,,RFFXUVEHIRUHLQWHUYDO,LVUHDFKHGDJDLQDQGWKHF\FOHVWDUWVDQHZ,QOHVVVHYHUHFDVHVLQWHUYDOV,DQG,,,PD\QRWRFFXU:HWKHQKDYHWKHUHODWLYHO\VLPSOHVLWXDWLRQRIFRQWLQXRXVJURZWKRIFRQWDFWDWWKHIURQWDQGORVVRIFRQWDFWDWWKHUHDU7KHXQNQRZQVYDQGYDQGWKH\2FRRUGLQDWHRIWKHFRQWDFWSRLQWVLQWKH x2\2

Trang 8< /span>

V

0

wheel load variation

Ngày đăng: 11/08/2014, 06:20