8/12/2019 Buletin stiintific . Calculul pulsatilor la sisteme liniare

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C AL C UL U L PU L SAT I I L OR PROPRI I L A S I ST EME L I N I ARE

CARE At ; NUMAI CUPLAJ E ELASTl CE

Se gencr al i zeaz A met oda di n. D J p~nt ~ si s t eme. l i ni ar ecupl at e el ast i c av1nd or i ce conf l gur a~l e ~l . se ~r eZl ~~~a~i eischem~ l og i cA car e per mi t e gener ar ea coef ~cl en~l l o r ~pul sa~i i l or pr opr i i pe cal cul at oar e numer l ce.

BERECHNUNG . DER EI GENFREQUENZEN BEl L I NEAREN SYSTEMEN

MI T NUR ELASTI SCHEN KUPPLUNJ EN

J . i i ei n [3J aar gest el l e Met hode ~Ur l i near e. e~ast i sc hver bundene Sys t eme bel i ebi ger For m wl ~d ver al l gemel ne~t . un~ei n l ogi sc hes F~ussoi agr amm zur q~n~r l er ung oer Koef f l zl e~i e ,~er E i gen f r equenzg l e i chung f Ur o l g l t a l e Rechner dar gest e t .

A NEWMODELOF CRITICAL FBEQ1JENcr SESIZOR

Th e pa pe r ai ms t o pr e s en t t he c on s t r uc t i on an d op er a t i on

of a new model o f t he cr i t i ca l f r equency det ect o ! ' - . ' i o r k i ngas a

v i sua l cnd sound adapt er as ' , ' ! e1 : lf o r cr i t i ca l r esonance

f r e qu en c i e s . I t i s a l s o p r e s e nt e d a t h eo r e t i c a l s t u dy o n a ma -

t hemat i cal model .

per f o r med on t he basi s o f d i f f e r ent p r i nc i p l es , have been usee

f or t he mess ur ement and r ec0r di ng of mochani c~l vi br at i ons. lr e

l ess known i nst r ument s sr e t hose wi t h v i sua l and sound ~ar n i ng

possi b i l i t i es r e l a t i ve t o cr i t i ca l r esonance f r equenci es,

danger ous f r equenci es dur i ng t he machi ne- t ool or ager egat e

oper at i on.

Th e av ai l ab l e i ns t r ument s ba s ed an t he mec ha ni c al dy-

namomet er pr i nci p l e di f f er one f r om t he ot her by t hei r f i el d

measur i ng f r equenci es, sensi t i veness end pr eci s i on .

I n a mor e r est r i c t ed domai n o f u t i l i za t i on t hey t ake over

v i b r a t i ons on cer t a i n d i r ect i ons and t he t echnol ogy o f execu-

t i C' : li s co mpl ex.

T he i n s t r u men t de s i g ne d an d t e s t e d i n t he l ab or a t o r y of

j f i ne mechani cs wi t h i n t he Un i ver s i t y o f Br a~ov i s based on an

8/12/2019 Buletin stiintific . Calculul pulsatilor la sisteme liniare

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dedu8~di n ( 2?}.

In virtutea expresiilox' (8) ~i (2). se obline

def or mat i a aU5pens i e i sub sar c i na nomi nal ~

fn- f'o[1.,..(p/Pn~

Cal