The concept of redundant illumination is introduced to ensure the coherent illumination of zone plate and reduce the effect of source instability and element vibration.
引入冗余照明的概念，以实现波带板的空间相干照明以及降低束线对光源不稳定性及元件振动的要求。
2
In some specific conditions, some gates had stronger vibration, and few ones had resonance and hydraulic instability.
在一些特定条件下，某些闸门曾产生较强烈的振动，少数闸门曾产生共振和动力失稳现象。
3
As a kind of rotary machine, the common types of failure about main reducing gear have machine run instability, vibration abnormality, noise and speed change, etc.