Tiêu chuẩn iso 06267 1980 scan

w International Standard INTERNATIONAL ORGANIZATION FOR STANDARDI ,ZATION MEIKKCZYHAPOfiHAR OPrAHM3AlJ lR fl0 CTAH~APTbI3ALJMWORGANlSATlON INTERNATIONALE DE NORMALISATION Alpine skis Measurement of be[.]

w

-

0

v ,

Pr i e ba sed on 2 pges

ISO (h Inter natio al Or ganizatio f or Stan ar dizatio ) is a w or l w id f ed r atio of

In ia

Sw itz r lan

Printed in S itzer lan

Alpine sk is -

mor e

d f initio s aply :

v ibratin sk i

2.2 nat ura1 f r eq e c,f : T he n mber of v ibr atio s per u it

time of a v ibratin sk i

Vibration priod is given by the for mula

f=lT

tio of t he initial ampltu e of Vibratio to half its v alu w hie

t he sk i v ibrate

th Sta rt of e t (ie 2,5

a o o th Vibr atio Cha r t (s e f ig r e 2)

for t he ev aluatio )

a nd a n in u tiv e displac me t tr an d c r (s e f ig r e 1)

Or der to av oid r es nan e ef f ects, a nd s al c mpris a vic hav -

c v er i g th w idth of th sk i, sp c d a t interv als of at least

3.2 Rele se

plac d n t r nor e t han 2 0 m fr om t he tip of t he sk i T he initial

w eig t a nd s al be 2,s + if5

re or der

Clamp t he sk i as s ow n in f ig r e 1

folows e actly t he mov eme t of t he sk i A fter adju tme t of

2 5 + it5 m , r eleas it a nd r ec r d t he v ibratio s

I

Ev aluation

Is e f ig re 2) :

a} t he initial d f le tio of th sk i;

c) t he half lfe, t 1/2, in s c n s;

t 30

T=3ö

e) t he natura1 fr eq e c,

for mula

f 1

=-T

b) t he bran of sk i;

h) t he nat ura1 f r eq e c ;

half lfe;

T

0

<

8

0

3

2

0

CJ

2

Scale fa ctor at lest 5 m s-l

Fig r e 2 -