The main objective of this study is the modelling and optimization of an industrial Hydrocracker Unit (HU) by means of Adaptive Neuro Fuzzy Inference System (ANFIS) model. In this case, some data were collected from an industrial hydrocracker plant. Inputs of an ANFIS include flow rate of fresh feed and recycle hydrogen, temperature of reactors, mole percentage of H2 and H2S, feed flow rate and...

Data-driven soft sensors have been widely adopted in industrial processes to learn hidden knowledge automatically from process data, then monitor difficult-to-measure quality variables. However, extract and utilize useful dynamic latent features accurately for efficient estimations remains one of the most important research issues sensor modeling. In this article, a supervised bidirectional lon...

It is well known that subspace identification methods that assume open loop data without correlations between the input and noise, may give biased estimates when applied to closed loop data. The effect of the controller gain parameters on the quality of the identified model is studied when closed loop data are used. Several subspace identification methods (both open loop and closed loop methods...

This paper presents a new methodology for designing a detection, isolation, and identification scheme for sensor faults in linear timevarying systems. Practically important is that the proposed methodology is constructed on the basis of historical data and does not require a priori information to isolate and identify sensor faults. This is achieved by identifying a state space model and designi...

<span>The energy efficiency in the debutanizer reboiler combustion can be monitored from oxygen content of flue gas reboiler. The measurement conducted situ using an sensor. However, soot that may appear around sensor due to process obstruct sensor’s function. In-situ redundancy sensors’ unavailability is a significant problem when damaged, so measures must made directly by workers portab...

this paper focuses on using the recently developed extended finite element model for buckling analysis of edge cracked columns under concentric axial load. the effect of crack depth and its location on the carrying capacity of columns is studied. the effect of different boundary conditions is also investigated. numerical examples are offered to show the efficiency and effectiveness of the propo...