The suppression of the regenerative chatter phenomenon in turning process via the variation of the frequency and amplitude of the spindle motor excitation is carried out in this research. A programmable inverter is employed for variable periodic excitation of the spindle motor. A set of turning experiments is designed and performed on a number of conical work pieces both in constant spindle spe...

We consider the problem of synthesizing correct-by-construction globally asynchronous, locally synchronous (GALS) implementations from modular synchronous specifications. This involves the synthesis of asynchronous wrappers that drive the synchronous clocks of the modules and perform input reading in such a fashion as to preserve, in a certain sense, the global properties of the system. Our app...

By explicitly taking into account effects of Alfvén waves, I derive from a simple energetics argument a fundamental relation which predicts solar wind (SW) speeds in the vicinity of the earth from physical properties on the sun. Kojima et al. recently found from their observations that a ratio of surface magnetic field strength to an expansion factor of open magnetic flux tubes is a good indica...

The magnetic geared permanent magnet synchronous motor (MG-PMSM) is a PMSM that has two rotors with different rotation speeds and includes the function of gear. design studies 45kW-class MG-PMSM are conducted for application driving system tram. In this research, first, to derive detailed model tram, analysis characteristics according stator winding method was performed. After selecting can red...

Because many real-world problems can be represented and solved as constraint satisfaction problems, the development of effective, efficient constraint solvers is important. A solver's success depends greatly upon the heuristics chosen to guide the process; some heuristics perform well on one class of problems, but are less successful on another. ACE is a constraint solver that learns to customi...

Faults between stator winding turns of synchronous generators have led to specific changes in the harmonic content currents. In this paper, these are used detect faults variable-speed connected three-level converters during their operation. Currents typically measured for control purposes avoid installation additional sensors. The neutral point current converter is also evaluated under generato...

Recently, scientific attention has focused on estimating Greenland's dynamic mass loss through changes to flow speeds, thickness, and length its marine outlet glaciers. For the ice sheet glaciers, been found be highly sensitive in climate individual glacier geometry. ice-sheet-independent glaciers around periphery, is presently overlooked. Here, we apply an open-source, automated method of meas...

Synchronous generators are of two type’s salient pole type and round rotor type. The load angle curve of a cylindrical rotor synchronous machine comprises a single sine term only while in salient pole synchronous generators, power-angle characteristic has two terms. The first term is the fundamental component due to field excitation (the same as the cylindrical rotor) and the second term ...

Frequency stability in today's power systems has become more critical than ever due to the growing contribution of renewable energy sources. This situation arisen because electro-mechanical decoupling between generation sources and main grid caused by their connection through electronic converters. paper designs two synthetic inertia controllers that adhere code requirements from different coun...