细而长的进气道有利于发动机怠速稳定，短而粗的进气道在大负荷高转速时有利于发动机功率提升(进气歧管越长，空气在进气歧管内的振动频率就越低，反之进气歧管越短，空气的振动频率越高）。进气歧管里有个长短气道转换翻板，怠速或部分负荷时用长的进气道，大负荷转换成短气道减少进气阻力提高进气效率。
介绍了可变进气道长度、可变气门升程及可变气门定时等提高充气效率的先进技术。
It introduces some advanced technologies which increase the charging efficiency, such as the variable length of the intake duct, the variable valve stroke, the variable valve timing and so on.
论述了飞机进气道可变几何形状控制系统的鲁棒设计方法和系统的综合试验。
A Robust design approach and integrated test procedure of the aircraft variable geometry inlet control system are discussed.
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