The writer of this paper uses a new method called“tracking slope method”todraw a shear diagram and a bending moment diagram in the classroom teaching of mechanics ofmaterials.

According to the tilt tracking circle of adaptive optical system,a real-time tracking processor is built based on PCI bus,and the core processor is DSP and FPGA.

A sampling measurement algorithm without frequency tracking based on electronic instrument transformer;

Current feedback frequency tracking control with matching of piezoelectric;

Research on the Frequency Tracking System of HF-Inverter Power Controlled by PI-DPLL;

A new method based on correlation theory and frequency tracing algorithm is presented .

Through DC input voltage regulation and circuit resonant frequency tracing,approximate linear load power regulation can be realized by the power supply.

because of bridge rectifier adopting APFC technology and inverter adopting the frequency tracing technoiogy of no phase difference, which have very important significance on effective running of power network? frequency conversion power supply and loading.

Experimental results show that the energy transmission system is capable of automatic frequency-tracking and transmission power-adjusting and has stable received energy.

In consideration of the process of card wire heating operation,a strategy of frequency-tracking with integral action separation and DPLL(digital phase-locked loop) is employed to work out a high frequency induction heating power with 100 kHz/5 kW for on-line card wire annealing.

The paper studies digital control scheme of resonance inverter frequency-tracking based on all digital phase-locked loop.