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| Re: Canarsie CBTC (99517) | |||
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Re: Canarsie CBTC |
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Posted by Stephen Bauman on Thu Jun 16 09:14:53 2005, in response to Re: Canarsie CBTC, posted by Jeff H. on Wed Jun 15 23:50:00 2005. 2) ...in the end, its still all about signaling and safely controlling train movements, which is a craft distinct from ATM machines, web browsers and (yes SB) industrial controls....The craft for controlling train movements is not changed under CBTC. There are N trains to be controlled. At time T, each of the trains has position: x1(T), x2(T),..., xN(T); each of the trains has velocity: v1(T), v2(T),..., vN(T). These parameters are transmitted to the control system. The control system issues commands to the trains for v1(T+Δt), v2(T+Δt),..., vN(T+Δt) which are transmtted to the trains. The craft or algorithm by which these commands are determined from these parmaters has not been changed. What has been changed is how x1(T), x2(T),..., xN(T) and v1(T), v2(T),..., vN(T) are measured and how these parameters and commands v1(T+Δt), v2(T+Δt),..., vN(T+Δt) are transmitted between the control system and the trains. I had supposed the problems with the Canarsie Line's CBTC implementation were limited to the transmission between the trains and the control system. You have hinted there may also be problems in measuring the state parameter variables. There may well be problems in how Siemens translated the control algorithms. There should not be any because the company Siemens purchased has been in that business for eons. However the project has not progressed far enough to evaluate that part. |
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