A New Design of Ultrasonic Power Based on ARM

2012 ◽  
Vol 629 ◽  
pp. 671-675 ◽  
Author(s):  
Zhen Yao ◽  
Zhong Ning Guo ◽  
Yong Jun Zhang
Keyword(s):  
Power System ◽  
Experimental Result ◽  
Ultrasonic Power ◽  
Constant Amplitude ◽  
Amplitude Control ◽  
Frequency Tracking ◽  
Tracking Method ◽  
Phase Lock ◽  
Program Flow ◽  
System Program

An ultrasonic power for rotary machining is introduced based on ARM. Its frequency tracking principle is analyzed. The improved accurate frequency tracking method using a phase lock loops (PLL) is presented. The control circuit based on ARM is designed and the presentation of system program flow chart is given. The experimental result proved that the ultrasonic power system can realize quick and accurate frequency tracking. Ihe power can work well with constant amplitude control.

Implementation and Performance Assessment of a Vector Tracking Method Based on a Software GPS Receiver

2011 ◽  
Vol 64 (S1) ◽  
pp. S151-S161 ◽  
Author(s):  
Sihao Zhao ◽  
Mingquan Lu ◽  
Zhenming Feng
Keyword(s):  
Global Positioning System ◽  
Carrier Frequency ◽  
Gps Receiver ◽  
Tracking Loop ◽  
Frequency Tracking ◽  
Tracking Method ◽  
Global Positioning ◽  
Vector Tracking ◽  
Tracking Loops ◽  
And Performance

A number of methods have been developed to enhance the robustness of Global Positioning System (GPS) receivers when there are a limited number of visible satellites. Vector tracking is one of them. It utilizes information from all channels to aid the processing of individual channels to generate receiver positions and velocities. This paper analyzes relationships among code phase, carrier frequency, and receiver position and velocity, and presents a vector loop-tracking algorithm using an Extended Kalman filter implemented in a Matlab-based GPS software receiver. Simulated GPS signals are generated to test the proposed vector tracking method. The results show that when some of the satellites are blocked, the vector tracking loop provides better carrier frequency tracking results for the blocked signals and produces more accurate navigation solutions compared with traditional scalar tracking loops.

Three-point Frequency Tracking Method

2009 ◽  
Vol 8 (6) ◽  
pp. 425-442 ◽  
Author(s):  
P. Frank Pai
Keyword(s):  
Frequency Tracking ◽  
Tracking Method

Frequency Conversion Type Ultrasonic Power Based on DSP Control Technology Research

2013 ◽  
Vol 442 ◽  
pp. 349-353 ◽  
Author(s):  
Chang You Li ◽  
Ming Ming Jia ◽  
Wen Hua Wang
Keyword(s):  
Embedded System ◽  
Power Supply ◽  
Frequency Conversion ◽  
Ultrasonic Power ◽  
Frequency Synthesis ◽  
Direct Digital Frequency Synthesis ◽  
Frequency Tracking ◽  
Digital Frequency ◽  
Frequency Changes ◽  
Dsp Control

The introduction of the direct digital frequency synthesis (DDS) technology in the field of communication is against the traditional ultrasonic machining power supply which does not have the multi-frequency tracking shortcomings to build a frequency conversion type ultrasonic power. Frequency conversion type ultrasonic power supply is based on DSP embedded system and adopts direct digital frequency synthesis (DDS) technology combined with a software phase locked frequency of composite frequency tracking scheme to realize automatic search transducer resonance frequency and frequency automatic tracking function which can response the different characteristics of the transducer dynamical; With the use of phase shift control power-principle to realize the output power regulating function when the frequency changes and reduce the switching power loss; It provides an important reference for the design of new frequency conversion type ultrasonic power.

scholarly journals An approved frequency tracking method in connected element interferometry

2017 ◽  
Vol 139 ◽  
pp. 00053
Author(s):  
Qiang Zhao ◽  
Kang Gao ◽  
Xiaomin Hou
Keyword(s):  
Frequency Tracking ◽  
Tracking Method

Frequency tracking for power system control

1986 ◽  
Vol 133 (2) ◽  
pp. 95 ◽  
Author(s):  
S.A. McLlwaine ◽  
C.E. Tindall ◽  
W. McClay
Keyword(s):  
Power System ◽  
System Control ◽  
Frequency Tracking ◽  
Power System Control

Pulsed Portable Magnetohydrodynamic Power System Program

1998 ◽  
Vol 14 (6) ◽  
pp. 1049-1058 ◽  
Author(s):  
Daniel W. Swallom ◽  
Victor M. Goldfarb ◽  
Judy S. Gibbs ◽  
Isaac Sadovnik ◽  
Vladimir A. Zeigarnik ◽  
...  
Keyword(s):  
Power System ◽  
System Program

Digital Frequency Multiplying Method for the Power System Frequency Tracking Based on FPGA

2011 ◽  
Vol 328-330 ◽  
pp. 1747-1750
Author(s):  
Cui Yun Gao ◽  
Wen Jing Li ◽  
Ming Liu ◽  
Ru Han
Keyword(s):  
Power System ◽  
High Frequency ◽  
Interference Immunity ◽  
Frequency Tracking ◽  
Digital Frequency ◽  
System Clock ◽  
Hardware Realization ◽  
Improve Accuracy ◽  
Frequency Aliasing ◽  
System Frequency

The paper propose the digital frequency multiplying method based on frequency de-noising on FPGA, aiming at the frequency aliasing of the high frequency interference in the power system frequency tracking circuit. The basic principle and hardware realization are discussed.The performance of the system is tested using two different system clock, the experiments show that: This method can eliminate the error caused by frequency aliasing, and improve the interference immunity of the system. In addition, experiments also proved that using higher system clock can improve accuracy absolutely.

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