Dynamic force analysis iii
- 1. Unit-III Dynamic Force Analysis-III Dr. Ambuj Saxena Associate Professor Department of Mechanical Engineering G. L. Bajaj Institute of Technology and Management Plot No. 2, Knowledge Park III, Greater Noida, Distt. G.B.Nagar (U.P.) India -201306 Theory of Machines (RME-602)
- 2. Bennett’s Construction OC is at right angle to the line of stroke, it occupies the position OC1 and the crosshead P moves to the position P1, Produce PC to intersect OC1 at M Klien’s acceleration diagram 𝑣𝑐𝑜 𝑂𝐶 = 𝑣 𝑃𝑂 𝑂𝑀 = 𝑣 𝑃𝐶 𝐶𝑀 = 𝜔 Reference : R.S. Khurmi (Theory of Machines) The triangle OCM is known as Bennett’s velocity diagram Velocity and Acceleration of the Reciprocating Parts in Engines
- 3. Bennett’s Construction • From O, draw OL1 perpendicular to P1C1 (i.e. position of connecting rod PC when crank is at right angle). Mark the position of point L on the connecting rod PC such that CL = C1L1. • From L, draw LK perpendicular to PC and from point K draw KQ perpendicular to the line of stroke PO. From point C, draw CN perpendicular to the line of stroke PO. Join NQ. A little consideration will show that NQ is perpendicular to PC. • The quadrilateral CQNO is known as Bennett’s acceleration diagram. It is similar to Klien’s acceleration diagram. Klien’s acceleration diagram Reference : R.S. Khurmi (Theory of Machines)