2011ҩѧרҵϰժҪע
Դ233У 2011425
: עFFoֵѧ鷨
FFoֵ
дڵ⣺
1)¶ȲIJDZڲ¶
2)еľ췽Լ
˶епɿ֤FF0ΪɿԲ
(һ)DֵZֵ
1.Dֵ Ȳָһ¶£ɱ90%(½һλ)ʱ䣬ԷӱʾDֵ˵ǿD=2.303/k
2.Zֵ ¶ϵָijһDֵٵԭ1/10ʱ(½һλʱ)ߵ¶ֵ()ͨȡ10档
Zֵһ¶ȷΧ(100桫138)lgDT֮Թϵ
Z =(T2CT1)/( lgD1ClgD2 )D1/D2 = 10(T2CT1)/Z
裺Z = 10棬T1 = 110棬T2 = 121棬D1/D2 = 1011/10
D1/D2 = 12.59D2= 0.079 D1
ʽΪ110101210.79ӵЧͬ
ҲZ=10ʱ¶ÿ1棬Ч21%
DֵZֵ˵ȷ
A.Dֵϵָһ¶£ɱ90%ʱ
B.Dֵϵָһ¶£ɱ10%ʱ
C.DֵС˵ǿ
D.DֵС˵Բ
E.ZֵϵָijһDֵٵԭ1/10ʱߵ¶ֵ
𰸣BC
(һ) FFoֵ
1.F
F = t 10(T-T0)/ Z
t¶ȵļʱ(һΪ0.51)
Tÿʱ¶(ȵżҺвⶨ)
T0α¶(ѹʱΪ121棬ʱΪ170)
Fֵ壺Ϊ̵ĿɿԲFΪһ¶(T)ZֵΪ10Ч170Чͬʱ൱ʱ䡣
2.Foֵ ൱121ѹʱɱȫҪʱ䡣¶µЧת121ĵЧֵF0Ϊʱ()F0ѹ
F0ʱ٣ϵʱ䡣
FoֵӰأ
С״ȴϵ
ƷҺճȡ
ڵŲ
F0ֵD121ֵĶֵij˻˵F0 D121ijʼ
ΪȷЧӦע⣬Ӧȡִʩʹÿĺ10¡μFoʱӦʵӰȫأһ50%涨FoΪ8֣ʵʲӦFo12Ϊá
A Fֵ
B F0ֵ
C Zֵ
D Dֵ
E T0ֵ
һ¶ɱ90%ʱ D
Чͬʱʱٵԭ1/10¶ȵĶ C
ѹ̿ɿԲ B
̿ɿԲ A
Ƽ
ࣺdrfcy