找回密码
 立即注册
查看: 142|回复: 0

?????????????!!

[复制链接]

0

主题

0

回帖

56

积分

管理员

积分
56
发表于 2019-9-13 23:46:11 | 显示全部楼层 |阅读模式
??????????????????

???????????????4

????????????

????

?????????????????????????????????????????.?????????????????????????????????????????????????????????????????????????????????------????????????. ?????????????????????????????????????????????????????????????????????????????

?????

??? ????????Mathematica

????

??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????

????

1??????????????????

?1????????????

?2??????????

?1????????????A?B???????r????Ra

????V?VARlnb

aln

?2??????????A?B??????????????????????????????????A??????????B???????rRb

?????????V?VAlnb

aln

???????????????????????????????????????????????????????????????????????????

2????????

??????????????????

?1?????????????????????????????????????

?2??????

?3????????????????????AB??????????10V??????

?4???????A?????????10V?????????????????????A???????10V????8--10??

?5???????A???????????9V?7V?5V?3V,1V??8-10????????????????

?6?????????????????O???? ??????????????????

?1?--- (5)?1???

?6???????????r??????????

?7????????????A?B???2a?2b ?

3

????????

???????

?

????????????????!!

?<????????>????

??????

1?????? ????????

2?????????????????????? 3????????????????

??????

????????????????????????????

[????] ??????

1???????

????E????????????????????????????????????????????????????????????????????????????????????????????????????????U?????? E???U ????E?????????????????

2???????

?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????

3??????

??????????????,???????????,?????????????????????????????????????? ???(????) ?????(????)

???D??E???D?dS?0?????E?dl?0?

???U?bE??dl??aba

??

?j??E???j?dS?0?????E?dl?0????U?bE?dl???aba

4???????????????? ?1????

???????A?B???????r?????????

E?

?

2??0r

A?B?????????r???????

1

b

V?VA

blna

ln

?2??????

???A?B?????????????????????????????????????????????VA???????????????A??????????B?????????

??E?

j?

?

??E????????????????????????

???r????????

b

V?

VA

blna

ln

?1???????????

?2????????????

???

?????????????????????????????????????????????????????????????????????

[????]

1? ????????????????

?1??????????????????????????????????????????????????????

?2???17-5????????????????????????????????????1-2mm????

?3??????K2???????????????????AB??????????12V??????

?4????????????????????A?????????10V?????????????????????A???????10V????7???????

?5???????A???????????8V?6V?4V?2V??8??????????????????????4??

?6????8???????????????????O????????????

2

??r??????????

?7????????????A?B???2a?2b ?

?8????174????????r????????V????????????????

2????????????????

???10.0V?9.0V?8.0V?7.0V?6.0V?5.0V?4.0V?3.0V?2 .0V?1.0V?0V??????5 .0V????????????????

????

[????]

??????????

V?(V) r(cm) V?

10.0 ? ?

8.0 1?1 8?17 2?1%

6.0 1?50 6.31 4?9%

4.0 2?15 4.14 3?4%

3.0 2.55 3?12 3?8%

2.0 ? ? ?

1.0 3?58 1.07 6?5%

V??V?

V?

(%)

?

???

1??????????????????????(???????). 2???????????,?????.

3??????????????????????,??V???????,???????.

rln(1)

?8.17(V)? ?1?r1?1.1cm??V1?VA

ln()b

Ev?

V??V?

V?

?100%??2.2%

rln(1)

?6.31(V)? ?2?r2?1.5cm??V2?VA

ln()b

Ev?

V??V?

V?

?100%??5.0%

?3??4??5???

3

?????

(1) ???????????????????????????????????? (2) ?????????????????????????r?0.2cm??????

?????

r

V?r?V8.00.2

?V?VA???V??r?A????1.09V

ar1.1?rlnlnlnbb2.1451.09Ev??100%?12%

8

ln

?????????????????????????????????????????????

4


??????????????!!????????
?????http://www.850500.com/news/17492.html
?????,??!
您需要登录后才可以回帖 登录 | 立即注册

本版积分规则

Archiver|手机版|小黑屋|Discuz! X

GMT+8, 2026-3-13 07:31 , Processed in 0.325314 second(s), 19 queries .

Powered by Discuz! X3.5

© 2001-2025 Discuz! Team.

快速回复 返回顶部 返回列表