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3? ??????-50?+150kPa????????
140kPa????????????142kPa??????????????????????????????
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??????142?140?100%?1.43%140 ??142?140?100%?1.41%142 142?140?100%?1%150???50? ??
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2-1 ????????????????????????????? ???
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2?5 ????????t1???????????t2???????????
t1?t2??0
dt2d?
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d?300(t?0)?
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T1(s)??0t2(0?)
T(s)?2?4?? ?0s?1
300??1 ?? = ??2 0? =25 ??0=120
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+12025300 ??+
300
=
1
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120
300
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=
120
+ 300?275 ???? ??+120
=
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120
?275??
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350s????????
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350=275???2.92=14.83
2?6 ??????????????????100Hz??????????????5???????? ?????????????50Hz???????????????????????? ??
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1
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1?3 ???????50?150kPa????????140kPa?????????????142kPa?????????????????????????????? ??
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L140?2????1.41?
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2?5 ????????t1???????????t2???????????
t1?t2??0
dt2
? d?
????????25??????300??????????????0?120s??????300s???????
???t1?t2??0
?25(t?0)dt2
?t1????0?120s d??300(t?0)
??t=350s??t1?t2??
??
???k=1???????????????y(t)?1?e
?t?
??0
??????????????????????t2(?)?25?(300?25)?(1?e???350s??t2?25?(300?25)?(1?e?)?285.15(?C)? ???????t1?t2?300?285.15?14.85(C)?
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*2?6 ??????????????????100Hz??????????????5??????????????????????50Hz???????????????????????? ??
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发表于 2019-9-13 23:46:11