The paper deals with the possibilities of application of fuzzy logic to the analysis of weld quality, particularly assessment of the weld surface condition by means of measurable electric signals emitted during welding. A simple fuzzy inference system was realised which could relatively efficiently assess the weld quality on the basis of time variations of the welding voltage and short-circuit time in a certain time window.
COBISS.SI-ID: 11371542
This paper presents a new neuro-fuzzy system based model, which is useful for the modelling of nonlinear dynamic systems. The new proposed model constitutes a soft computing method, namely, reasoning with a fuzzy inference system (FIS) and an optimisation by the neural-network learning algorithm. A structure, named the decomposed neuro-fuzzy ARX model is proposed. This structure is based on decomposition of the FIS. A comparative study of dynamic system identification using conventional FIS models and the proposed neuro-fuzzy ARX model is presented for Box-Jenkins data set.
COBISS.SI-ID: 11577622
Advanced monitoring systems enable integration of data-driven algorithms for various tasks, for e.g., control, decision support, fault detection and isolation (FDI), etc. By using Taguchi DoE robust design on AANN, an improved and reliable FDI scheme was achieved even in case of small faults introduced to the system. The accuracy and performance of AANN and FDI scheme were tested by experiments carried out on a real laboratory hydraulic system, to validate the proposed design for industrial cases.
COBISS.SI-ID: 13441302
The paper presents development of welding processes and power sources for electric arc welding. A short historical review of development is followed by a description of advanced inverter and digital welding power sources. Particular attention is paid to some major functions and properties of digital welding sources, which permit various ways of welding-process control,high flexibility, and ensure high quality welding.
COBISS.SI-ID: 1012673
The paper deals with a comparison of the conventional TIG welding process with the high-efficiency A-TIG welding process made on the basis of results obtained in practical welding trials. Applications of A-TIG welding are indicated as well. The experimental part of the paper is accompanied also by an axplanation of the physical background of A-TIG welding using urface-active fluxes, which essentially increase fusion penetration, i.e. welding speed.
COBISS.SI-ID: 996801