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This paper documents fatigue-related mechanical failures in variable-frequency drive (VFD) motor machinery due to mechanical vibrations excited by drive torque harmonics which are created by pulse width modulation (PWM) switching. Present effort models the coupled system with a full electrical system (including the rectifier, dc bus, inverter, and motor), and an industrial mechanical system (including...
The paper documents fatigue related mechanical failures in variable frequency drive (VFD) motor machinery due to mechanical vibrations excited by drive torque harmonics which are created by PWM switching. Present effort models the coupled system with full electrical system including rectifier, DC bus, inverter, motor, and an industrial mechanical system including flexible couplings, gearboxes and...
Research on the high-intensity laser frequency doubling in KDP crystal with a temperature distribution for typeIangle-phase matching has been carried out by the use of a split-step fast Fourier transform algorithm and a fourth-order Runge-Kutta(R-K) integrator method. Special attention has been paid on the influences of the temperature distribution in the crystal owing to laser energy's absorption...
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