For the mechanism illustrated in Fig P19 determine the numbe

For the mechanism illustrated in Fig. P1.9, determine the number of links, the number of lower pairs, and the number of higher pairs. Using the Kutzbach criterion, determine the mobility of the mechanism. Is the answer correct? Briefly explain.

Solution

No of links are(n) = 04

Lower Pairs (J1)= 03

Higher Pairs (J2)= 02

Mobility M= 3(n-1)-2J1-2J2

                    =3(4-1)-2 x 3- 2 x 2

                   = 9-6-4= -1

M= -1

Statically indeterminate structure. Links have more constraints than are needed to maintain equilibrium (TRUSS).