The purline is often designed as a simple beam, and only it′s strength needs to be calculated, if the roof panel can prevent it′s lateral buckling and torsion.
檩条一般采用简支梁，假定屋面板能阻止其侧向失稳和扭转，则只计算其强度。
2
The random stress of torsion rod spring may be calculated after road surface, vehicle speed arid constructional parameters are given, and service life may be estimated according to P-S-N curve.
在给走路面、车速、结构参数后，可计算出扭杆的随机应力，并根据P - S - N曲线估计出扭杆的寿命。
3
But the European Jetta keeps the Golf's multilink rear axle; U. S. models get a specially developed torsion-beam rear axle.