引气活门，气源系统内，使来自发动机或辅助动力装置的空气进人气源支管的活门。
BLEED valve, a valve in the pneumatic system for air supply from the engine or auxiliary power unit to the pneumatic manifold.
云内4108发动机，性能好，专业减噪，震动力小。新颖的外观造型，宽敞的驾驶室操作空间，良好的视野，豪华可调式座椅。
Cloud in 4108 engine, good performance, noise reduction, shaking force is small. The appearance of novel modelling, spacious cabin space operation, good vision, luxury adjustable seat.
综上所述，三参数VFD模型能够很好的反映推进剂的粘弹特性，将它用于固体发动机动力学分析，可以得到药柱在时域和频域内的动态响应。
As mentioned above, three parameter VFD model can characterize the viscoelasticity of solid propellant. Applied it to SRM dynamic analysis, time and frequency domain response can be calculated.
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