∆h

PV-1

PVo

PV1

to t1t-1

old s.s.base line

Td

∆ h

Tnss

= data points

New s.s. base line

Numerical formulation for time constant, Tc:

Based on the fact that any point along a straight line has similar slope’s value; hence,

*(Tnss , PVnss)

Tc

dnssc TTT −=

11

11

1

1

−

−

−−

=−−

ttPVPV

tTPVPV

nss

nss

( ) ⎟⎟⎠

⎞⎜⎜⎝

⎛−−

−+=−

−

11

1111 PVPV

ttPVPVtT nssnss

),(),( 11 PVtatslopePVTatslope nssnss =

Numerical Analysis on openloop process response data

**UNPUBLISHED MATERIAL**- INTERNAL USE ONLY