In this paper excitation characteristics of the Liquid Crystal (LC) capacitive chemical and biological sensor are examined and the optimum frequency and voltage range for the sensor interface are introduced. Interdigitated capacitor has been used for the sensor capacitance measurement and two different molecular orientations, homeotropic and homogenous, have been considered. The LC sensor capac...

We investigate the hard nonresonant excitation of the forced Duffing equation with a positive damping parameter E. Using the symbolic manipulation system MACSYMA, a computer algebra system. we derive the two term perturbation expansion by the method of multiple time scales. The resulting approximate solution is valid for small values of the coefficient e As the damping parameter e increases, th...

Abstract. Advanced aeroelastically optimized tip extensions are among rotor innovation concepts which could contribute to the higher performance and lower cost of wind turbines. A novel design optimization framework for turbine blade based on surrogate aeroelastic modeling is presented. An academic modeled in an code equipped with a near-wake aerodynamic module, complex shapes parametrized usin...

Abstract Different Design Driving Load constraints (DDLs), are explored in this work to determine under which and conditions a winglet can have an added value the wind turbine blade design. Multi-objective Bayesian optimization is used maximize rotor’s power production while minimizing flapwise DDLs. Surrogate models, created using machine learning techniques such as Gaussian Processes Neural N...

the doubly fed induction generator (dfig) is one of the most popular technologies used in wind power systems. with the growing use of dfigs and increasing power system dependence on them in recent years, protecting of these generators against internal faults is more considered. loss of excitation (loe) event is among the most frequent failures in electric generators. however, loe detection stud...