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This study aims to investigate the apparent backscatter of cancellous bone from the second ultrasonic harmonics using an imaging system. A cylinder model was used as the bone trabecular model and a positive correlation was found between the power spectrum of the second harmonics and trabecular thickness. The result of the in vitro experiment using ultrasound imaging system shows that the apparent...
This paper proposes and studies the phase-shifted chaotic space vector modulation (SVM) scheme for harmonics performance improvement in paralleled voltage-source inverters fed permanent magnet synchronous motor (PMSM) drive. By using the proposed scheme, the current harmonics around the switching frequency and some of its multiples in PMSM are eliminated. Besides, the peaky harmonics around all multiples...
This paper studies and proposes a harmonic-optimized control strategy for the paralleled voltage source inverters (VSI) fed permanent magnet synchronous motor (PMSM) drive. The system configuration and equivalent model of the paralleled VSIs fed PMSM drive are developed and analyzed. The mathematical analysis reveals the principle and performance of the carrier phase-shifted space vector pulse width...
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