Randy The general concept is called a state observer.=A0 You construct a mathemat= ical model of a system that runs in parallel with the physical system.=A0 I= t will take the same inputs as the physical system and give an output that = doesn't have all of the noise that the physical system produces.=A0=20 If you don't know the model parameters the state observer can generate them= for you.=A0 You make it adaptive by looking at inputs and outputs of the p= hysical system and tuning the model parameters until you reduce the error, = or the disagreement between the model and the system, to an acceptable valu= e.=A0=20 Dave Sarraf =A0 >I was reading some of the info on LIGO recently and it appears there is >again use for some of this.=A0 As I understood the paper, the concept is t= o >run a simulation of the system behavior in parallel and compare the >simulation to the real time measured response.=A0 The feed back loop is th= en >constructed as a smooth predicted value.=A0 This prevents amplification of >noise developed in the actual system from feeding back into future amplifi=
Randy The general concept is called a = state observer. You construct a mathematical model of a system that r= uns in parallel with the physical system. It will take the same input= s as the physical system and give an output that doesn't have all of the no= ise that the physical system produces. If you don't know the = model parameters the state observer can generate them for you. You ma= ke it adaptive by looking at inputs and outputs of the physical system and = tuning the model parameters until you reduce the error, or the disagreement= between the model and the system, to an acceptable value. Da= ve Sarraf >I was reading some of the info on LIGO recen= tly and it appears there is >again use for some of this. As I u= nderstood the paper, the concept is to >run a simulation of the syste= m behavior in parallel and compare the >simulation to the real time me= asured response. The feed back loop is then >constructed as a s= mooth predicted value. This prevents amplification of >noise de= veloped in the actual system from feeding back into future amplified error.= |