The gust-cascade interaction noise was numerically simulated using computational aeroacoustics by solving the two-dimensional linearized Euler equations.
The traditional transformer is trending towards pocketsize and noiselessly in inverter using high-frequency link technique,but the control circuit becomes difficult to be designed.
The showcase, by running a small train, displays Doppler speed testing, materials detection, noise monitoring, supersonic distance testing, track weighing, and photoreader, etc.
The rock breaking without smoke,dust,slungshot,noise and any internal injury can reduce environmental pollution and energy consumption,which has great economic value and social sense.