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2011ҩѧרҵϰժҪע޾

Դ233У 2011425
: ע޾FFoֵѧ޾޾鷨

FFoֵ

дڵ⣺

1)¶ȲIJDZڲ¶

2)еľ췽Լ΢΢

˶епɿ֤FF0ΪɿԲ

(һ)DֵZֵ

1.Dֵ ΢Ȳָһ¶£΢ɱ90%(½һλ)ʱ䣬ԷӱʾDֵ˵΢ǿD=2.303/k

2.Zֵ ¶ϵָijһ΢Dֵٵԭ1/10ʱ(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.Zֵϵָijһ΢Dֵٵԭ1/10ʱߵ¶ֵ

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 ൱121ѹʱɱȫ΢Ҫʱ䡣¶µЧת121ĵЧֵF0Ϊ׼ʱ()F0ѹ

F0ʱ٣ϵʱ䡣

FoֵӰأ

С״ȴ͸ϵ

ƷҺճȡ

ڵŲ

F0ֵD121ֵ΢Ķֵij˻˵΢F0 D121΢ijʼ

ΪȷЧӦע⣬Ӧȡִʩʹÿĺ10¡μFoʱӦʵӰȫأһ50%涨FoΪ8֣ʵʲӦFo12Ϊá

A Fֵ

B F0ֵ

C Zֵ

D Dֵ

E T0ֵ

һ¶ɱ΢90%ʱ D

Чͬʱʱٵԭ1/10¶ȵĶ C

ѹ̿ɿԲ B

̿ɿԲ A

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