Analysis Relative-velocity-method r2h3i

RELATIVE VELOCITY METHOD BY GRAPHICAL METHOD The following points are to be considered while solving problems by this method. 1. Draw the configuration design to a suitable scale. 2. Locate all fixed point in a mechanism as a common point in velocity diagram. 3. Choose a suitable scale for the vector diagram velocity. 4. The velocity vector of each rotating link is ⊥r to the link. 5. Velocity of each link in mechanism has both magnitude and direction. Start from a point whose magnitude and direction is known. 6. The points of the velocity diagram are indicated by small letters. 11/23/2017

Pradeep Kumar Mehta Assistant Professor (MITM)

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1. In a crank and slotted lover mechanism crank rotates of 300 rpm in a counter clockwise direction. Find (i) Angular velocity of connecting rod (ii) Velocity of slider.

A

60 mm

150 mm 450 B

O

Configuration diagram

11/23/2017

Pradeep Kumar Mehta Assistant Professor (MITM)

2

Solution Step 1: the magnitude and velocity of point A with respect to 0 VA = ωXOA =

11/23/2017

Pradeep Kumar Mehta Assistant Professor (MITM)

3

A

60 mm

150 mm 450 B

O

Configuration diagram

11/23/2017

Pradeep Kumar Mehta Assistant Professor (MITM)

4

ad c

b

11/23/2017

Pradeep Kumar Mehta Assistant Professor (MITM)

5

11/23/2017

Pradeep Kumar Mehta Assistant Professor (MITM)

6

c

b

11/23/2017

Pradeep Kumar Mehta Assistant Professor (MITM)

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