Research And Development Of Mechanical Product Design Platform Base On CBE

The B737 NG aircraft is a mature aircraft in the development history of Civil Aviation in China.Air conditioning system is an important system of B737 NG aircraft.Whether the fleet runs smoothly or not is closely related to whether the air conditioning system works normally..In particular,the air conditioning system also carries the function of supercharging the aircraft cabin.If the air conditioning system fails at 10,000 meters high,it is likely to cause the cabin pressure release,which has serious safety risks.At the same time,the air conditioning system is also a key system to provide comfortable environment for the crew and passengers and guarantee the normal operation of electronic equipment.Therefore,it is necessary to study the air conditioning system of B737 NG aircraft.This paper makes a detailed study of the B737 NG air conditioning system,and analyzes the working principle of the airborne refrigeration system,as well as the fault logic relationship between the key components.The failure mode effect and criticality analysis(FMECA)is adopted to analyze the airborne refrigeration system.Various typical fault modes are listed,and traditional fault elimination methods are sorted out to analyze the advantages and disadvantages.At the same time,a large number of B737 NG air conditioning system fault basic data were collected and analyzed,related factors were found out,the alarm threshold value was set using remote monitoring software,and the aircraft air conditioning performance was degraded,or the situation in the early stage of failure was given timely email alarm.Through the interpretation of a large number of cases,the alarm settings and optimization of the disposal method,an early warning and fault handling system was set up to reduce the impact of the failure of air conditioning system on the smooth operation of B737 aircraft.Through data acquisition for more than one year,repeated modification of threshold limits,test and demonstration,a more reasonable alarm interval is finally determined,which makes early warning of aircraft air conditioning system failure possible.The research results can be directly applied to the airlines in operation.It provides technical support for avoiding the important events such as aircraft return and standby landing caused by the air-conditioning system failure of B737 NG aircraft,and guarantees the safety and punctuality of passengers' flight.It has practical economic and social benefits.According to the above analysis,a feasible aircraft health management system is designed to monitor and manage the aircraft health status.Key training and verification data were obtained by statistical analysis of flight message and personnel operation.At the same time,the system carries out multi-dimensional analysis and multi-way display of the problem alarm during flight,which facilitates the maintenance team to handle events and conduct statistical analysis of problems,and improves the maintenance efficiency,thus improving the safety of the aircraft.