This study investigated the adaptive fault-tolerant control (FTC) for a flexible variable structure spacecraft in presence of external disturbance, multiple actuator faults, and saturation. The attitude system model fault are first given. A sliding mode-based detection observer radial basis function-based estimation were designed to detect time occurrence estimate amplitude an unknown fault, re...

In laparoscopic surgery, image quality is often degraded by surgical smoke or side effects of the illumination system, such as reflections, specularities, and non-uniform illumination. The images complicate work surgeons may lead to errors in image-guided surgery. Existing enhancement algorithms mainly focus on enhancing global contrast, overlooking local contrast. Here, we propose a new Patch ...

This paper proposes an adaptive integral-type terminal sliding mode tracking control approach based on the active disturbance rejection for uncertain nonlinear systems subject to input saturation and external disturbances. Its main objective is achieve zero error in presence of disturbances, parametric uncertainties saturation; ubiquitous problems most practical engineering systems. The propose...

There are fewer problems encountered with optical voltage transducers in comparison with their inductive and capacitive counterparts. Although capacitive and inductive transformers are used vastly for the purpose of measurement and protection in the networks, they cause problems such as core saturation and improper transient responses which decrease the accuracy of measurement and eficiency of ...

this study was conducted to investigate the effects of applying methods andamount of ammonium polyphosphate (0, 2 and 4 wt%) on fire retardancy andmechanical properties of wood flour/polypropylene composites. the resultsshowed that addition of fire retardant improved the mechanical properties such astensile and flexural strengths and fire retardancy of composites. but by increasingof fire retar...