**4. Lyapunov exponent parameter**

Local Lyapunov exponent parameter is used to detect the chaotic phenomenon of nonlinear response of the follower attractor. Positive Lyapunov exponent refers to chaotic phenomenon while negative Lyapunov exponent indicates to periodic motion [12]. **Figure 7** shows the local Lyapunov exponent against number of points when the follower offsets to the right (O = 10 mm) at coefficient of restitution (0.2), cam speed (N = 200 rpm), and follower guide's clearance (16 mm). In this figure there are positive and negative local Lyapunov exponent in which the negative local Lyapunov exponent represents to the steady state while the positive local Lyapunov exponent reflects to the transient state. Each value of local Lyapunov exponent has a value of embedding dimension [13].
