排序方式: 共有23条查询结果,搜索用时 31 毫秒
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为了验证航空发动机在低温环境温度下的起动性能,基于试验舱模拟自然环境进行了某型涡扇发动机低温起动试验,
介绍了试验设备及试验准备情况,选取环境条件为-40 ℃的降温历程曲线作为研究对象,该条件下的冷浸区别于高空台风车冷
浸,能够使发动机内、外部关键部位均达到目标温度。试验结果表明:舱内冷浸3 h后发动机外部附件和内部转动部件已“冷透”。
因低温环境下主燃油泵调节器内部零组件工作特性变化而导致的起动过程供油时间提前和供油量增多,是影响该型发动机低温
起动特性的主要因素;对调节系统预热(冷运转)可明显提高低温环境下的起动成功率。该方法可在外场推广使用。 相似文献
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Multi-parameter decoupling and slope tracking control strategy of a large-scale high altitude environment simulation test cabin 总被引:2,自引:0,他引:2
A large-scale high altitude environment simulation test cabin was developed to accurately control temperatures and pressures encountered at high altitudes. The system was developed to provide slope-tracking dynamic control of the temperature–pressure two-parameter and overcome the control difficulties inherent to a large inertia lag link with a complex control system which is composed of turbine refrigeration device, vacuum device and liquid nitrogen cooling device. The system includes multi-parameter decoupling of the cabin itself to avoid equipment damage of air refrigeration turbine caused by improper operation. Based on analysis of the dynamic characteristics and modeling for variations in temperature, pressure and rotation speed, an intelligent controller was implemented that includes decoupling and fuzzy arithmetic combined with an expert PID controller to control test parameters by decoupling and slope tracking control strategy. The control system employed centralized management in an open industrial ethernet architecture with an industrial computer at the core. The simulation and field debugging and running results show that this method can solve the problems of a poor anti-interference performance typical for a conventional PID and overshooting that can readily damage equipment. The steady-state characteristics meet the system requirements. 相似文献
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回首去日,可怕的不再可怕2010年9月13日,"火星500"计划的6名志愿者在试验舱里度过了第105个"飞行日",这项计划也顺利走完了它的第一程。无疑,这是一个特别值得纪念的日子。这一天,志愿者们自然想到了和"火星500"计划第二阶段(105天实验)的志愿者们曾聊过的情况。 相似文献
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空气喷气技术系统公司在加里福尼亚州萨克拉门托附近完成了超音速发动机试验设备的建造.其中超音速设备的3.6×7.3m试验舱段,在马赫数8,高度为30480m状态下可试验30秒.研制X-30空天飞机发动机的洛克达因公司已与空气喷气公司签定了16个月的试验合同,对发动机方案进行试验验证.试验工作将于1988年末开始,试验经费为五百万美元.试验结果 相似文献
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2011年11月4日,俄罗斯生物医学问题研究所内,"火星500"模拟飞船的舱门缓缓开启,6名身穿蓝色舱内服的实验者鱼贯而出,在"王跃!王跃!"的欢呼中,一名小个子的中国人狡黠地眨了眨眼睛,向人们挥手微笑。至此,王跃和来自其他国家的5名同伴结束了520天与世隔绝的模拟"火星之旅","踏上地球"。520天的旅程,6名志愿者积累了大量研究数据,对密闭 相似文献