phase integral
1.In this paper, The DFT is used to process signals from the sensors of Coriolis mass flowmeter, and calculate the frequency and phase difference . In order to achieve the integral period sampling and ensure the precision of digital signal processing, a new technique that can be easily realized and track the frequency with high precision is proposed.
2.In this paper,the DFT is used to process signals from the sensors of Coriolis mass flowmeter,and calculate the frequency and the phase difference. In order to achieve the integral period sampling and ensure the precision of digital signal processing,a new technique that can be easily realized and track the frequency with high precision is proposed.
3.In the experimentalresearch, four different excitation control approaches are emphatically compared in their control effectiveness to phase lead stability of a generator, which are proportional-integral differential controller(PID), power system stabilizer(PSS), linear optimal excitation controller(LOEC) and nonlinear excitation controller (NEC).
5.A phase-lock circuit composed of special phase-lock CMOS chip CD 4046 and frequency dividing chip CD 4040 is designed,with a simple external integral loop filter composed of a resistance and a capacitance.
6.We have completed the modular design. Haven analyzed the model and the structure of digital phase-locked loop (DPLL), wedesigned a new high accuracy DPLL application in inverter which use proportion integral (PI) method replacing traditional filter, use phase accumulator realize the function of digital control oscillator ( DCO). The high speed advantage of FPGA’s operation is made hard to demonstrate for the inconsequence in structural arrangement.
9.Using solid phase reaction method,the perovskite Pr(0.64)Ag(0.044)MnAl(0.2)O3 with super magnetoresistance is prepared. By analyzing its structure and components,it is found that integral perovskite structure can be formed only when the sintering temperature is higher than 1 100 ℃,the structure is cubic with its lattice constant of about 0.386 nm.
