通过对测量数据的噪声点过滤，数据精简等预处理，采用NURBS曲线拟合螺杆型线并分析了其拟合误差。
The NURBS curve is used for fitting the screw profile when cloud datas pretreatment is already done such as eliminated noise data and data reduction, the fitting error is also analyzed.
它测量范围广，能自动采集流量、压力、温度、功率、噪声等参数，测量参数直接输入微机获得精确的数据、图表、曲线。
Its wide range, the acquisition automatically flow, pressure, temperature, power, noise, and other parameters, measuring parameters entered into the computer to obtain accurate data, charts, curves.
整个三相铁芯由三条曲线硅钢带料卷制而成，中间无气隙及接缝，油箱采用低损耗、低激磁电流、低噪声等特点。
Whole three-phase core is made of three curved silicon steel belt material through rolling, without clearance and seam. The tank has features of low loss, low exciting current, low noise and others.
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