Ministerul Educaţiei Tineretului şi Sportului al Republicii Moldova

Universitatea Tehnică a Moldovei

REFERAT

Lucrarea de Laborator nr. 3a

Tema: Determinarea momentului de inerţie al rigidului şi verificarea teoremei lui Steiner utilizând metoda oscilaţiilor

torsionale

A efectuat Studentul grupei ___________ ________________________ __________________________ semnătura nume, prenume A verificat __________ ______ ______________ _____________________ nota data semnătura nume, prenume profesor

Chisinău ________

1. Scopul lucrări: ______________________________________________________

___________________________________________________________________________

___________________________________________________________________________

___________________________________________________________________________

2. Aparate şi accesorii: ___________________________________________ __________________________________________________________________________

__________________________________________________________________________

3. Schema instalaţiei

Unde : 1 ______________________ 1’ ______________________

2 ______________________ 2’ ______________________

OO’ _____________________ r _______________________

a ____________________ a’ ________________________

4. Formula de calcul:

,)2(22

1

222

TTTarmI−

+= ,22

21

′+

+=

a

a

II

IITT

2 2

2 ' '22 , 22 2a a

mr mrI ma I ma

= + = +

unde ________________________________________________________

_____________________________________________________________

_____________________________________________________________

_____________________________________________________________

_____________________________________________________________

_____________________________________________________________

_____________________________________________________________

5. Tabela măsurărilor şi determinărilor ____________________________ data / semnătura profesorului

Nr. t t1 t2 T T1 T2 a a’ I Ia Ia’ m d 212

2

TT

'

a

a

I II I

++

1

2

3

medie

6. Exemplul de calcul

I = __________________________________ ____________________________________________________

212

2

TT

= ____________________________________________________

Ia = ___________________________________________________ Ia’ = ____________________________________________________

'

a

a

I II I

++ = _________________________________________________

7. Calculul erorilor: Eroarea absolută şi relativă a mărimi I se calculează numai pentru un caz

I m r aT

T T= +

−( ) .2 2

2

12 22

∆I = ______________________________________ ______________________________________________________

______________________________________

______________________________________

8. Rezultatul final I = ε =

9. Concluzii _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________