The key problem of mismatch control and manufacture of symmetric arc-shaped gears is perfectly solved by using suitable cutter tilt and new generating method.
根据刀盘参数，选用合适的刀倾角，采用新的展成法，圆满地解决了失配量的控制和加工这种齿轮的关键性问题。
A mathematical model of fume diffusion in welding process was founded by considering welding arc as a spot source of generating fume and supplying the turbulent diffusion theory.
把焊接电弧作为一个发尘点源，应用大气湍流扩散理论，建立了焊接过程中烟尘扩散的数学模型。
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