Development Of Airliner Conceptual Analysis Platform CTAP

In order to apply computers to airliner conceptual design, an engineer ing method based airliner conceptual multi-parameters synthesis analysis platform is developed, namely CTAP(Civil Transport Analys is Platform). On the basis of former code JLANA, new modules including propulsion, stability&control and landing gear were developed; several modules including geometry, aerodynamics, performance and weight were updated; a new function was added which can proceed conceptual parameters sensitivity analysis based on surrogate model; engine database was built; content and format of input as well as output was re-organized; a new function was added which can display 3D configuration of airliner; a series of user interface was developed. The major work in this thesis is as follows.1) The thrust and fuel consumption of engine is obtained by interpolation of typical engine database. A process is built which can calculate and evaluate longitudinal/lateral/directional stability, efficiency of control surfaces and dynamic characteristics of aircraft. Landing gear is layout quickly and major components are designed automatically, and also weight of landing gear is estimated. The definition of wing geometry is re-stipulated, the area of wing is calculated with various methods. An approach of calculating takeoff and landing distance is added. Weight and center of gravity(CG) location of each system is calculated, thus CG of aircraft is determined.2) The sample points in design space are selected with Opt LHD(Optimal Latin hypercube design) method, and are analyzed by an airliner conceptual multidisciplinary analys is code to obtain a series of required objective parameters. A second-order polynomial response surface is used to construct the surrogate-model to replace the multidisciplinary analys is code. After accuracy test, the surrogate model can be used to analysis and display sensitivity to assist selection of conceptual parameters.3) Interfaces are developed based on Matlab/GUI which can be used to input parameters, call scripts, display 3D configuration and results. Interfaces, scripts, database are integrated in Matlab environment to form the CTAP. Accuracy is verified according to comparison with actual data.The CTAP features new and updated discipline modules, performing fast calculation, sensitivity analys is and optimization better, owing user friendly interfaces and operation procedure. The environments of development and operation are unif ied, with clear structure and high expans ibility. The CTAP can be a efficient tool for airliner conceptual design.