航空点火器故障机理及测试方法研究

发布时间：2018-03-12 11:26

本文选题：航空点火器　切入点：数学建模　出处：《中国民航大学》2015年硕士论文　论文类型：学位论文

【摘要】：航空发动机是飞机的动力之源,飞机在地面起动时,航空点火器为航空发动机燃烧室提供明火,点燃混合可燃气体,以保证发动机完成起动运转。飞机在空中飞行遇到恶劣天气时,航空点火器亦以低值火花保证发动机燃烧室安全正常工作。航空点火器对飞机等航空器的飞行安全起到至关重要的作用。随着航空点火器使用时间的增长,航空点火器出现故障的几率会增加,常见的点火器故障有:火花频率失常、火花能量不足、放电电压不足、火花持续时间不足等。这些故障在飞机日常检修中不易被察觉,给航空器飞行造成极大的安全隐患。迫切需要对航空点火器典型故障的产生机理进行研究,并设计航空点火器火花参数测试系统。为此本文针对航空点火器火花频率失常、火花能量不足、放电电压降低等故障机理进行研究,分析影响火花频率失常和火花能量降低的因素,对点火电路进行数学建模,并对典型故障进行电路仿真和数值仿真,验证了故障元件的参数变化对火花频率等火花参数的影响机理,提出了一种基于LabVIEW平台的航空点火器火花参数测试方法,设计了测量电路。通过对点火电路进行数学建模,并对典型故障进行仿真,明确了点火器典型故障的来源。设计的火花参数测试系统较好的展示了航空点火器火花参数的特征,为进一步深入研究航空点火器测试方法奠定了基础。
[Abstract]:The aero-engine is the power source of the aircraft. When the aircraft starts on the ground, the aeronautical igniter provides the open fire for the combustion chamber of the aeroengine and ignites the mixed combustible gas. To ensure that the engine starts and runs. When the plane flies in bad weather, The aviation igniter also guarantees the engine combustion chamber to work safely with the low value spark. The aviation igniter plays the vital role to the aircraft and so on aircraft flight safety. As the aviation igniter service time increases, The frequency of spark is abnormal, the spark energy is not enough, the discharge voltage is insufficient, the spark duration is not enough, and these faults are difficult to detect in the routine maintenance of aircraft. It is urgent to study the mechanism of typical failure of aeronautical igniter and to design a test system for parameters of aeronautical igniter sparks. In this paper, the frequency of aeronautical igniter sparks is abnormal. The fault mechanism such as insufficient spark energy and low discharge voltage are studied. The factors influencing the frequency of spark and the energy of spark are analyzed, and the mathematical model of igniting circuit is built, and the circuit simulation and numerical simulation of typical fault are carried out. The influence mechanism of parameter change of fault element on spark parameters such as spark frequency is verified. A test method for spark parameters of aviation igniter based on LabVIEW platform is proposed, and the measuring circuit is designed. The typical fault is simulated, and the origin of typical fault of igniter is determined. The design of spark parameter testing system shows the characteristic of spark parameter of aviation igniter. It lays a foundation for further research on the testing method of aeronautical igniter.
【学位授予单位】：中国民航大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：V263.6

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