The square regulation graded index fiber is considered to have fairly good dispersion property because the near axle meridian light in the fiber may focalize automatically.
Monomotor bogies , where both axles of the bogie are driven by a single motor , often encounter torsional resonances, which lead to periodic longitudinal slip.
Introducing a kind of dynamic capability study method which tested jumpiness of the sawblade made in Germany on the precision sizing saw machine, as well as vibration of principal rotation axle.