The Research On Energy Consumption Of Aircraft Cabin And Temperature And Humidity Control Of Bridge Air Conditioning

Aircraft in the stage of the pre-flight,post-flight and stops,due to excessive energy consumption of airborne APU,in 2012,the CAA(civil aviation administration)officially launched the work of bridge equipment replacement of the APU.But in the promotion process,reflecting some of the problems.The main problems: the use of bridge air-conditioning equipment lead to poor cabin air comfort level,and whether the energy consumption is optimal.The root cause is that it cannot correctly assess the energy consumption of the cabin system,resulting in the control of the bridge air-conditioning is not ideal.In order to solve the problem of energy consumption in the cabin,the energy consumption system of the cabin is constructed,and the influence of each factor on the energy consumption of the cabin is analyzed.Modeling the modules,including the cabin outdoor meteorological parameters model,the cabin envelope thermal equilibrium model,the cabin air heat balance model.The model of the cabin outdoor meteorological parameters includes the outdoor temperature model,the solar radiation model and the cabin outside the temperature model,the model calculation results can provide a prerequisite for the calculation of cabin energy consumption.The cabin envelope thermal equilibrium model includes the heat balance model of the outer cabin,the heat transfer model of the cabin and the heat balance model of the inner cabin.The heat transfer of the cabin is calculated by the reaction coefficient method.Through the calculation of the thermal equilibrium equations,the temperature of the inner cabin and energy consumption can be changed.The variation trend of energy consumption in the cabin with different set temperature is analyzed,and the most suitable cabin temperature range is determined according to the PMV index,which provides the theoretical basis for the control of the bridge air conditioning.The working principle of bridge air conditioning system is analyzed,and the mathematical model of heater,condenser and control object is established.However,it is necessary to use the appropriate controller to ensure the stability of the system during operation.As the bridge air-conditioning environment in which complex and changeable,simply use the traditional PID controller cannot achieve satisfactory control effect.The single neuron PID controller combines the neural network and the PID,and has the advantages of both.It can realize the self-tuning of the parameters.On the basis of satisfying the control requirements,the fastness and stability of the system response are also good.