民用航空发动机控制系统时间限制派遣方法

时间限制派遣方法允许航空器降低余度派遣。应用该方法对航空发动机全权限数字电子控制系统进行已知故障状态下的保留故障放行,并确定保留故障时间。在满足机队平均丧失推力控制率下,根据控制系统内部余度元件单个故障导致瞬时丧失推力控制事件的概率进行故障分类,并确定允许单个故障派遣的部件。建立控制系统简化状态的开环马尔可夫计算模型,利用MATLAB软件求解在选取保留故障时间内的丧失推力控制率。在适航要求允许的丧失推力控制率范围之内,确定最长的限制派遣时间。结果表明该方法是航空器型号合格审定的一种有效方法,也是制定航空器主最低设备清单和维修大纲的一种有效方法。

A Method on Time-limited dispatch for the control system of civil aero-engine

Time-limited dispatch (TLD) allows the degraded redundancy dispatch of aircraft. The aero-engine fitted with full authority digital electronic control (FADEC) system with known faults can be dispatched with a deferred fault by applying TLD, and the time of deferred fault should be determined. Under fleet average loss of thrust control (LOTC) rate being achieved, faults are classified by rate of instantaneous LOTC caused by single faults of FADEC system internal redundant components, and components with single faults which leave the FADEC system in an acceptable dispatch configuration are determined.Building the reduced-state open loop Markov calculation model and computing the rate of LOTC in assumed time of deferred fault by MATLAB software. Determining the longest time of limited dispatch without exceedence of LOTC rate meeting the necessary airworthiness requirements.The results indicate that the method is an effective approach for type certification and developing master minimum equipment list (MMEL)and maintenance review board report(MRBR) of aircraft.