RMS-DC Converter simulation help, please

Hello, everyone:
I'm doing an important project at University right now, and I think I could use some help. The project is about simulating some sensors, signal conditioners and other fairly complicated ICs with frequent use in Instrumentation. One of the simulations I am asked to do is the simulation of a generic RMS-DC conversion algorithm. The block diagram that I must implement is the following one, just as my teacher told me:
Being Vs the imput waveform, Vo the output one (converging to RMS value of Vs) and a generic LPF. My problem is that I don't know how to handle feedback very well...this diagram is quite easy to understand, but I'm not very keen at LabVIEW (I have just started learning it) and I cannot implement this (X·Y)/Z feedback. Can you help me? I would appreciate it.
Thank you in advance.
P.S.: Sorry if my English is somehow strange, I'm not a native speaker.

Are you talking about plain LabVIEW or are you trying to use the NI LabVIEW Control Design and Simulation Module?
LabVIEW Champion . Do more with less code and in less time .

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