MATLAB帮助文档中有个例子，好像是磁悬浮系统的一个应用，用到了输入延迟。
Simulate NARX Time Series Networks
This example trains an open-loop nonlinear-autoregressive network with external input, to model a levitated magnet system defined by a control current x and the magnet's vertical position response t, then simulates the network. The function preparets prepares the data before training and simulation. It creates the open-loop network's combined inputs xo, which contains both the external input x and previous values of position t. It also prepares the delay states xi.

[x,t] = maglev_dataset;
net = narxnet(10);
[xo,xi,~,to] = preparets(net,x,{},t);
net = train(net,xo,to,xi);
y = net(xo,xi)


This same system can also be simulated in closed-loop form.

netc = closeloop(net);
view(netc)
[xc,xi,ai,tc] = preparets(netc,x,{},t);
yc = netc(xc,xi,ai);