M. Bhushan et R. Rengaswamy, Design of sensor network based on the signed directed graph of the processfor efficient fault diagnosis, IND ENG RES, 39(4), 2000, pp. 999-1019
An optimally located network of sensors is a prerequisite for successful ap
plication of fault diagnosis techniques. Most of the previous work in the a
rea of fault diagnosis deals with methodologies for identifying possible fa
ults, given sensor data. Available literature suggests that very little wor
k has been done on methods for optimally locating the sensors for efficient
fault diagnosis. Some algorithms based on the concepts of observability an
d resolution were discussed in our previous work (ref 1: Raghuraj et al. Ai
ChE J. 1999, 45 (2), 310). These algorithms are based on a digraph (DG) rep
resentation of the process. In this article, the sensor location work is ex
tended to use the signed directed graph (SDG) representation of the process
. Various issues involved in utilizing the SDG of the process for the probl
em of sensor location are discussed. Algorithms for sensor network design b
ased on the SDG of the process are detailed and applied to two chemical eng
ineering case studies. It is shown that better design can be obtained by us
ing the SDG instead of the DG.