FROM REIHERAND MEISTER (1931) (STEADY STAT VIBRATIONS) FROM RAUSCH (1943)-(STEADY STATE VIBRATIONS) .< FROM CRANDelL (1949) (DUE TO BLASTING
(3.46)1"D
at
(l.41)F'D
180"
without enuoterwta.
+-1;r-
Cranks at 90
( O. 7 1 ) " D
. 0P '
with counterwt&
S i l c y l in d e r )..~
Fig. -frequency.'
ra
li
ib
litu
ti
la
crank r & d i . . (iLl c o uu ee ti u, -r o
.. cyliuder_nter r c c i p . wt.
(1,353.1) 1,082.5 rpm, 1.2 1,623.7 rp primar an secondar machin frequencie ar 585 wm and 1,170 th ri ry rati fr th resonanc appear critical at th secondar operatin fre1170, design is judge acceptable. quency, i.e., 0.8 1.2 t;
0.8 1 m 0. (1,475.5 1. 1, 75.5 :::; 1,770.
1,180.4
primar an secondar machin frequencie also fall outsid of thes range an therefore, no resonance condition are. possible.
f. Transmissibility factor (usually considered fo high frequenc machines mounte on springs) Th transmissi lity ac rs es than TR values ar greate than indicating that th dynami force are amplified ib es ince th forc ay in ocking ("') scillation is also possible
C.G.
(iL)
(lb.) PrIDllllY
Seenndu)'
Environmental demands
1. Ph siological effect
on
persons. Fig. example, Fig.
indicate vi ration to
"barel
notice
585 cpm
fo
axim
vibratio
am litu
0.000701 in.
2. Psychologica effect on persons. Us th same propeople no connecte tica barrie
3. Th
illa io re thos irecti ns
e og t
d i . t t a n c e (in.)
o n e c y li nd e r (0.0000284) rW ( rp m) '
it machin operations an acous-
ay be ecessary
am ru ture th li it exampl chec show no danger
in
ig 6.
4. Resonanc of structural components (superstructure
(4)) foundation. Pitchin sidered in in la ed re rovide th ac in anufacturer. owever twist-
0.5 fr tu al freq ency le eate than 1.5. othe structural co po ents ar involved in th example.
rizo al fo ce form co plane. Th oriz ntal translatio an need ot be coupled if
Conclusian. Th foundation is an acce le an r. atic th am lysisconfir th adequacy of th proposed foundation conas proposed, is acceptable.
