This work deals with the applications of extended Lagrangian-Hamiltonian mechanics on the asymmetric multi rotor system, where the symmetries are broken due to rotor mounted on the shaft with different masses and dimensions. The whole dynamics of asymmetries of multi-rotor system is investigated through extended Lagrangian formalism with a case study. In this work, an analytical model through e...

Abstract: This paper presents a new method for observing the rotor temperature of high-power squirrel cage induction machines in measurable variables. The method is based on the fact that the rotor resistance depends on the actual rotor temperature. The main problem is to separate the changes in the rotor resistance due to temperature and skin effect. By comparing the input impedance with a kno...

A hybrid micro air/ground vehicle has been developed and is specifically tailored to explore interior spaces with complex terrain. The vehicle, called the hopping rotochute, maneuvers through intricate environments by hopping over or through impeding obstacles. A small coaxial rotor system provides the necessary lift while a moveable internal mass allows directional control. In addition, the lo...

Abstract In order to investigate the noise characteristics of open rotor, numerical simulation was performed for an rotor which contains 11 blades front row and 9 rear row. The aerodynamic compared with a single propeller, i.e. propeller. Numerical results show that predicted field agree well literature. spectrum is obviously more complex higher than addition, contribution different generation ...

Modern wind turbines have been steadily increasing in size, and have now become very large, with recent models boasting rotor diameters greater than 120 m. Reducing the loads experienced by the wind turbine rotor blades is one means of lowering the cost of energy of wind turbines. Wind turbines are subjected to significant and rapid fluctuating loads, which arise from a variety of sources inclu...

H∞ controller for active magnetic bearings (AMBs) with flexible rotor system was designed in this paper. The motion equations of AMBs and flexible rotor system are built based on finite element methods (FEM). Weighting function matrices of H∞ controller for AMBs are studied for both the sensitivity and the complementary sensitivity of H∞ control theory. The simulation shows that the H∞ control ...

In this article, turbulent flow heat transfer in the air gap between rotor and stator of a generator under nonhomogeneous heat flux is studied experimentally. The rotor consists of four symmetrical triangular grooves. The stator surface is smooth and does not include any grooves. The relative heat flux between the rotor and the stator is 1 to 3. Temperature and heat flux are measured locally at...

Disk unbalance in rotating shaft of machines is a common problem. Direct measurement of unbalance forces due to disk unbalance is not possible, therefore, usually the unbalance forces are predicted via response measurements. In the present work, a model-based approach with joint input-state (JIS) estimation technique to detect the amount of unbalance present in a disc is proposed. The JIS techn...

There is unbalanced magnetic pull between the rotor and stator of the cage induction motor when the rotor is not concentric with the stator. These forces depend on the position and motion of the center point of the rotor. In this paper, the linearity of the forces in proportion to the rotor eccentricity is studied numerically using time-stepping finite element analysis. The results show that us...

We prove a shape theorem for rotor-router aggregation on the comb, for a specific initial rotor configuration and clockwise rotor sequence for all vertices. Furthermore, as an application of rotor-router walks, we describe the harmonic measure of the rotor-router aggregate and related shapes, which is useful in the study of other growth models on the comb. We also identify the shape for which t...