Friction stir welding has become a popular forging technique used in many applications. The Swedish Nuclear Fuel and Waste Management Company (SKB) evaluates this method to seal the 5 cm thick copper canisters that will contain the spent nuclear fuel. To produce repetitive, high quality welds, the process must be controlled, and today a cascade controller is used to keep the desired stir zone t...

The degree of vagueness of variables, process description, and automation functions is considered and is shown where quantitative and qualitative knowledge is available for design and information processing within automation systems. Fuzzy-rule-based systems with several levels of rules form the basis for different automation functions. Fuzzy control can be used in many ways, for normal and for...

In this paper, a class of second-order nonlinear cascade control systems is considered. Under certain structural assumptions, it is proven that these systems are exactly linearizable via nonregular static state feedbacks and state diffeomorphisms. Linearizing input transformations and the corresponding state diffeomorphisms are presented. Finally, nonregular static feedback linearization is app...

Aiming at the problem of low redundancy in structure cascaded H-bridge STATCOM. This paper studies and designs a STATCOM device based on STM32 distributed control. The article introduces basic topology realization principle control system. turn-on turn-off time MOSFET each is calculated by using law minimum harmonics, realize output fitted sine wave. A simulation model 12H bridge cascade built ...

This paper studies the technique of the composite nonlinear feedback (CNF) control for a class of cascade nonlinear systems with input saturation. The objective of this paper is to improve the transient performance of the closed-loop system by designing a CNF control law such that the output of the system tracks a step input rapidly with small overshoot and at the same time maintains the stabil...

In this paper, an improved cascade control strategy is presented for hydroturbine speed governors. Different from traditional proportional-integral-derivative (PID) control and model predictive control (MPC) strategies, the performance index of the outer controller is constructed by integrating the entropy and mean value of the tracking error with the constraints on control energy. The inner co...

The conversion of the electrical energy into mechanical is usually realized by a motor, power electronics and cascade control. relative stability (?-stability), i.e., displacement its eigenvalues this system analyzed for drive with BLDC motor. influence changing basic parameters motor supply on operation considered. 4th order closed-loop transfer-function control presented, where boundaries coe...

This paper proposes a cascaded backstepping control method with an augmented observer for the lateral of autonomous vehicle. The proposed structure consists inner-loop electric power steering (EPS) system and outer-loop lane-keeping (LKS). controller LKS calculates provides desired angle to EPS maintaining vehicle at center lane. Subsequently, generates torque track from outer loop. can guarant...

Fresh juices of colourful wild berries: cornelian cherry, blackthorn, white beam and elderberry are considered as valuable, highly nutritive beverages and characterized by the high level of vitamins and antioxidant capacity. The concentration process of these juices by membrane osmotic distillation was studied, where only water vapour is eliminated, while the heat sensitive, valuable compounds ...