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引用第10楼franco于2009-05-07 20:39发表的 :% S* n+ A- Y8 v6 }( S! o
The oscillating member is moved backwards and forwards through an angle of 90° (45° on ' d4 ^+ g' a; t7 n8 Y, \
either side of the vertical), the number of flexings being 20 000 and the rate of flexing 60 per
* ^6 ^6 ^9 s Xmin. A flexing is one movement, either backwards or forwards. After 10 000 flexings, the - X& O$ Z1 f( |+ m
sample is turned through 90° about the centre line of the cord guard. 7 T3 R$ m" P5 o
' b7 U: N6 H5 E7 c....... 是的,这段话写的确实很明白,但是我估计你还是理解错了。 ]. x! L6 O: o& Q' y4 S% o1 J
& N# k+ w& ?0 o/ e. ^5 _7 k1 ]翻译成中文的主要意思就是:" l M1 Q# Y6 b9 S; @% z( n
# Y6 F( [/ ]' ~) ^; u! VThe oscillating member is moved backwards and forwards through an angle of 90° (45° on
, x7 A! ~+ y* ieither side of the vertical), the number of flexings being 20 000 and the rate of flexing 60 per / F0 C' Z& ~6 _( J7 V) G2 ^4 ?
min. - 摇摆装置能够在90°的范围内前后摆动(其中这个90°指的是沿垂直位置两边各45°),以每分钟60次的频率摇摆20000次。. r2 B" ?' X% `1 D8 [; d' U% G) I. J! B( N
/ v0 y9 n7 O' M B+ R这句话讨论的是仪器的摆动机构要满足的特性,就是要能在90°的范围内前后摆动,如果只能在45°的范围内摆动的话,这个设备就是不符合要求的。这句话并没有涉及到一个摆动周期如何定义啊。, P4 q# b4 S5 J+ Z" |
2 w" G4 X3 w( w- G! F% Q2 cAfter 10 000 flexings, the sample is turned through 90° about the centre line of the cord guard. - 10000次摆动之后,将样品沿着电线防护套的中心线转动90°。
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0 [) I; {* M3 p2 y# H这句话说的是总共20000次的摆动样品应该在两个位置分两次完成而已,同样没有涉及到摆动周期的解释和说明。# Y! ^+ s2 b. f: [+ ~# B
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最重要的一句话应该是:A flexing is one movement, either backwards or forwards. - 一次摇摆就是一次移动,无论是向后还是向前的。( C7 x" }: i: o% A$ \6 j
( ~9 c$ T* Z7 Q这句话虽然容易引起歧义,但是仔细考虑一下也不是很难理解。可以看出,1个摆动周期就是单次的向前或者向后的移动。摇摆机构是在总共90°范围内摆动,那不管是向前还是向后的摆动角度都是45°了。由此可以得出1个摇摆周期就是45°而不是我们通常认为的90°。+ p, k9 _8 _4 K+ A% U' k
4 ?$ L9 j a& @摘抄UL 745-1标准中的相关章节如下,关于这个问题解释的非常清楚,供大家参考参考:
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; |' L) N. C# L* K* lA flexing is one movement, either backwards or forwards. That is, from vertical to 45° in one direction is the first flex, from there back to vertical is the second flex, from vertical to the opposite 45° is the third flex, from there back to vertical is the fourth flex, continuing until 10000 flexes have occurred. |
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