The oxygen regulator is the core component of aircraft life support system, which adjusts flow and pressure breathing gas according to pilot’s needs. In response problem that structural parameters are difficult adjust prone jitter when indirect system stable, a direct designed using stepper motor drive lung-type flapper, replacing diaphragm lever-type structure regulator. Due nonlinearity time-...

multileaf collimator (mlc) is among the radiation field shaping systems used for conformal radiotherapy and intensity modulation radiation therapy techniques. the mlc system that has been designed and fabricated in this study includes 52 leaves, 52 stepper motors, 2 dc motors, 16 programmable logic controllers (plcs) and one human machine interface (hmi). this system can be mounted on conventio...

Control structure design deals with the structural decisions of the control system, including what to control and how to pair the variables to form control loops. Although these are very important issues, these decisions are in most cases made in an ad-hoc fashion, based on experience and engineering insight, without considering the details of each problem. In the paper, a systematic procedure ...

In this paper the active vibration control of a four-story shear frame instrumented with piezoelectric actuators is presented. The piezoelectric actuators are hosted on the columns in two manners and the produced controlling forces by actuators are considered in the equation of motion. The smart structure modeling and control design is carried out using MATLAB software in state space form. Subs...

Model-Free Control (MFC) approach is a novel technique to handle nonlinearities and uncertainties in control systems order provide enhanced performance level. The design of MFC based on an ultra-local model, which approximation the dynamics controlled system for short period time. This structure also involves model-based robust control, guarantees accurate tracking closed-loop system. In this p...