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This work presents a selective rerouting methodology for part scheduling in the presence of shop floor disruption. Mean tardiness maximum tardiness and number of tardy jobs are the performance measures considered, to evaluate the effectiveness of the proposed methodology. In the proposed methodology, the parts in the queue of the failed machine are rearranged on the basis of earliest due date priority...
A metal disc-loaded coaxial cylindrical waveguiding structure is analyzed using field analytical approach for the TM mode of operation. The structure parameters are obtained in terms of equivalent inductance per unit length, capacitance per unit length and susceptance per unit length of the equivalent transmission line model. The developed analysis though yields the same results as that of field analysis...
This paper in detail presents the electromagnetic and RF behavior of gridless reltron. CST particle studio which is a commercially available 3D-PIC simulation code is used to study the beam-wave interaction behavior. Analytical investigation of the reltron modulating cavity is carried out. The modulating cavity has three different modes, i.e., 0, π/2 and π in accordance with their electric field patterns...
In the present paper, the beam-wave interaction behavior in the gyro-TWT amplifier has been studied using time dependent nonlinear single-mode analysis. The time dependent equations of motion which describes the interaction of the electrons with the RF wave are solved self-consistently for the performance evaluation of a typically selected fundamental mode 35GHz gyro-TWT amplifier operating at TE01...
In the present paper the single mode time independent nonlinear analysis of a second harmonic gyroklystron amplifier has been carried out for its beam-wave interaction behavior study. An experimental two-cavity 35GHz gyroklystron amplifier reported in the literature had used to validate the developed analytical approach. The beam-wave interaction behavior and performance evaluation studies of the...
In this article, we report the design and cold measurement of a Äa-band Metal Photonic Band Gap (MPBG) waveguide with a coupling from an external rectangular waveguide (WR-28) transition using a wraparound co-axial coupler. The metal PBG waveguide was realized by a triangular lattice of metal posts with a defect (removal of seven metal posts) at the center. The circular TE(n travelling electromagnetic...
The multimode beam wave interaction behavior in a three-cavity, W-band gyroklystron amplifier is studied using nonlinear, time-dependent, multimode analysis. The gyroklystron amplifier operates in the fundamental harmonic, higher order TE021 mode. The presented theory is used to study the concept of mode competition. A peak output power of around 330 kW at 93.2 GHz, an electronic efficiency of 25%,...
The design and simulation of a metal Photonic Band Gap (MPBG) cylindrical waveguide to a conventional rectangular waveguide transition using a wraparound co-axial coupler is presented. A rectangular waveguide drives a combined wraparound co-axial / MPBG cylindrical waveguide system. The wraparound co-axial input coupler converts a dominant rectangular waveguide mode into a resonator mode and which...
In recent years, sensorless techniques based on HF carrier injection have become very popular as they are capable to estimate rotor position in a wide speed range. They can provide precise control over interior PMSMs without the accompanying need for a position sensor. However, in surface-mounted PMSMs, the estimation of rotor position is only reliable at light loads due to the very small saliency...
The design and simulation of 94 GHz metal PBG cylindrical waveguide with a wraparound co-axial coupler has been presented. A WR-8 rectangular waveguide drives a combined wraparound co-axial / MPBG cylindrical waveguide system. The wraparound co-axial input coupler converts a dominant TE10 rectangular waveguide mode into a TE411 resonator mode and which is then coupled into the MPBG waveguide for the...
In this paper, a current sensorless adaptive secondary-side control is proposed for the series resonant converter, making it a good candidate for MHz 48 VRs. By means of varying AC equivalent resistance, the output voltage regulation is achieved by controlling the duty cycle of the synchronous MOSFET. A current sensorless adaptive digital control is proposed to control the current-type synchronous...
A Reconfigurable Manufacturing System (RMS) is having potential for quick adjustment in its production capacity and functionality. These RMSs are considered to be one of the technologies enabling shorter lead times, more product variants, fluctuating volumes of products, shorter product life cycles and lower cost. This paper presents the performance modeling of a hybrid system comprising of dedicated...
The traditional cylindrical waveguide in a gyrotron traveling wave amplifiers has been replaced with a novel Photonic Band Gap (PBG) waveguide structure having two dimensional triangular arrays of metal posts to address the mode competition problem and also to increase the power handling capability of these devices at short wavelengths of operation. This structure has been modeled and simulated for...
Over the last five decades, R&D, industry and academia in India have contributed significantly to electromagnetic analysis, numerical modelling and simulations and technologies in the area of microwave vacuum electronic sources, that culminated in the development and productionisation of a number of microwave tubes in India and enabled the concerned community to venture towards a number of new...
In this paper, the self-consistent large-signal formulation is used to study the beam-wave interaction mechanism in a gyrotron oscillator. The nonlinear interaction has been computed by solving the set of self-consistent nonlinear equations along the interaction length using numerical method. Consequently, the computation of energy, phase, output power, and efficiency of a gyrotron is made. The computed...
MILO has been analyzed for its beam wave interaction and the RF released energy has been calculated. The analytical results are obtained, typically, for a S-band MILO, and released RF energy is found as 2.5 Joule at 300 kV applied voltage. The analytical results has also been validated through PIC simulation code MAGIC and found to be in close agreement.
In this paper the study of electron bunching in the output cavity of gyroklystron has been carried out to optimize the output efficiency of gyroklystron by numerically solving the coupled equations obtained from nonlinear analysis, describing the strong interaction between the beam and RF fields in the output cavity of the gyroklystron. The generalized results obtained here can be applied to optimize...
A three dimensional particle-in-cell (PIC) code, MAGIC3D, is used to examine the performance improvement in a relativistic magnetron by perturbing technique. Asymmetrical metal rods of different length have been used to perturb the magnetic field in the annular sector of the resonant system. Enhancement up to 45% in the radiated output power has been obtained in the perturbed magnetic field case over...
A metal composed electromagnetic band gap (EBG) structure is analyzed using finite-difference time-domain (FDTD) method by considering the time-domain Maxwell's equations. For a two-dimensional metallic EBG structure of square lattices having orthogonal coordinate system, the band gap has been calculated. The desired pass band and unwanted stop bands have been observed for the successful operation...
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