This book for the first time examines periodic motions to chaos in
time-delay systems, which exist extensively in engineering. For a long
time, the stability of time-delay systems at equilibrium has been of
great interest from the Lyapunov theory-based methods, where one cannot
achieve the ideal results. Thus, time-delay discretization in time-delay
systems was used for the stability of these systems. In this volume, Dr.
Luo presents an accurate method based on the finite Fourier series to
determine periodic motions in nonlinear time-delay systems. The
stability and bifurcation of periodic motions are determined by the
time-delayed system of coefficients in the Fourier series and the method
for nonlinear time-delay systems is equivalent to the Laplace
transformation method for linear time-delay systems.