半对数坐标纸
semi-log paper
semi-logarithmic coordinate paper
渐开线坐标计算
Involute coordinate’s count
简正坐标计算
normal coordinate calculation
简正坐标分析
Normal coordinate analysis
nonnal coordinate analysis
vibrational harmonic force field
加工坐标系
Cutting coordinate system
processing coordinate system
极坐标位控
polar coordinates control