Reference : R.S. Khurmi (Theory of Machines)

1. Unit-III
Dynamic Force Analysis-II
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.  Draw OM perpendicular to the line of stroke PO, such
that it intersects the line PC produced at M.
 The triangle OCM is known as Ritterhaus’s velocity
diagram
Klien’s acceleration diagram
𝑣𝑣𝑐𝑐𝑐𝑐
𝑂𝑂𝑂𝑂
=
𝑣𝑣𝑃𝑃𝑃𝑃
𝑂𝑂𝑂𝑂
=
𝑣𝑣𝑃𝑃𝑃𝑃
𝐶𝐶𝐶𝐶
= 𝜔𝜔
Reference : R.S. Khurmi (Theory of Machines)
Ritterhaus’s Construction
Velocity and Acceleration of the Reciprocating Parts in Engines

3. Ritterhaus’s Construction  From point M, draw MK parallel to the line of stroke
PO, to interect OC produced at K.
 Draw KQ parallel to MO. From Q draw QN perpendicular
to PC
Klien’s acceleration diagram
 The quadrilateral CQNO is known as Ritterhaus’s
acceleration diagram. This is similar to Klien’s
acceleration diagram.
Reference : R.S. Khurmi (Theory of Machines)