Making use of the points measured on the drum helical curve of concrete-mixer truck, the helical Angle formula of the helical curve is obtained by means of least square method.
利用测得的混凝土搅拌车拌桶螺旋线上的一组离散点，通过最小二乘法拟合出了求解拌桶螺旋线螺旋角的公式。
Recursive least square method was used to adjust the parameters of the PID controller, which was applied in three-element control system of boiler drum level.
利用递推最小二乘法循环调整P ID参数，并将该控制器应用于锅炉汽包水位三冲量控制系统。
The drum with a square punch, increase the aperture ratio, increase drying efficiency.
内滚筒采用方形冲孔，加大开口率，提高烘干效率。
The drum with a square punch, increase the aperture ratio, increase drying efficiency.
内滚筒采用方形冲孔，加大开口率，提高烘干效率。
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