The aerodynamic shape design of train head should consider all kinds of factors because the relation between reducing aerodynamic drag and air pressure pulse may be conflictive and uniform.
减小列车空气阻力和降低列车交会压力波，既矛盾又统一，列车气动头部外形设计需要综合考虑各种因素。
The recuperators have high air resistance , low air preheating temperature and high fan pressure head , and fan has much noise to environment and are apt to break down with vibration .
此换热器空气阻力大，空气预热温度不高，风机压头高，环境噪声大，风机振动大、易损坏。
Inspection air pressure test(with water head) for No1. water ballast tank(No15 block).
No1压载水舱（No.15分段）气压试验（压头试验）检查。
The sensor head is an interferometric based fiber optic senor in which the air-gap will change with the pressure or temperature.
传感头部分是基于干涉原理的光纤传感器，它的腔体长度会随着压力和温度发生变化。
The head is a photo-acoustic detector using a closed air-cell and a pressure transducer.
探头为声光探测器，使用密封的空气室和压力传感器。
The head is a photo-acoustic detector using a closed air-cell and a pressure transducer.
探头为声光探测器，使用密封的空气室和压力传感器。
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