the efficiency of induction motors decreases at light loads. efficiency optimizer control systemsadjust the motor flux value to achieve the best efficiency in a wide range of load variations. reduced fluxoperation has some other benefits such as power factor improvement and torque ripple reduction. the latter isan important issue in a direct torque controlled induction motor drive. in this pape...

Recent experiments have shown interactions between the cavitation and fluid vortex formation in a hydrodynamic torque converter. This study aimed to clarify unsteady trigger mechanism flow-induced vibration caused by turbulence–cavitation interactions. The mass transfer model modified Reynolds-averaged Navier–Stokes k–ω were used with local density correction for turbulent eddy viscosity invest...

<p>The aim of the present research work is to investigate hydrodynamic characteristics (pressure distribution, rotational speed, thrust and torque) conventional B-series composite propeller blade. The open water efficiency for scaled model blade computed using computational fluid dynamics (CFD) fluent simulation tool. obtained numerical results show that will operate at optimum given spee...

Hydrodynamic effects are known to significantly affect the collective behavior of wet active matter systems. However, non-linear many-body nature these interactions makes them very challenging analyze, particularly in dense suspensions. Quincke rollers one canonical examples artificial microswimmers. These particles that move freely above a plate due torque generated by uniform DC electric fiel...

the direct torque control (dtc) of interior permanent magnet synchronous motor (ipmsm) offers simple structure and fast torque response. the conventional switching table-based dtc (st-dtc) presents some disadvantages like high torque and flux ripple and also variable switching frequency. this paper investigates the improved st-dtc strategies to reduce both torque and flux ripple in dtc of ipmsm...

axial flux permanent magnet (afpm) machines are attractive candidates for electric vehicles (evs) applications due to their axial compact structure, high efficiency, high power and torque density. this paper presents general design characteristics of afpm machines. moreover, torque density of the machine which is selected as main objective function, is enhanced by using genetic algorithm (ga) a...

In two earlier papers, (1'2) referred to here as I and II, respectively, we showed how to calculate the drag force on a macroscopic sphere or cylinder moving through a dilute gas by using an extended Boltzmann equation. This equation differs from the usual Boltzmann equation in that it treats the effect of collisions between.gas molecules and the macroscopic object as a term in the Boltzmann eq...

Butterfly valves are commonly used as control equipments in applications where the pressure drops required of the valves are relatively low. As shutoff valve (on/off service) or throttling valves (for flow or pressure control), the higher performance and the better precision of butterfly valves are required. Thus it’s more and more essential to know the flow characteristic around the valve. Due...

Due to the lack of a powerful propulsion device in conventional autonomous underwater gliders (AUGs), their mobility and flexibility are insufficient, thus not being capable also ensuring stability motion route. Thus, it is necessary further develop hybrid-driven AUGs. This paper applied CFD simulation experimental analysis methods study design AUG with propeller optimized from type swept-forwa...