  An effective modeling method for nonlinear distributed parameter systems
(DPSs) is critical for both physical system analysis and industrial
engineering. In this Rapid Communication, we propose a novel DPS modeling
approach, in which a high-order nonlinear Volterra series is used to separate
the time/space variables. With almost no additional computational complexity,
the modeling accuracy is improved more than 20 times in average comparing with
the traditional method.
