Research On Method Of Helicopter Conceptual Design And Optimization

Conceptual design is the first step of helicopter design and the basis of overall design.The task of conceptual design is to find one or more initial solution that meet the design requirements and the design specification, as well as their main parameters and aerodynamic parameters, is a design process from scratch. In order to do the overall design better, it’s very important to select the ideal parameters of the initial value in the conceptual design. A synthetic trade-off approach of conceptual design is developed for helicopter with main and tail rotors in this paper, which shows how to select and optimize conceptual design parameters.This article first formulated a set of helicopter design technical requirements, and select overall parameters like the total weight of the helicopter, engine power, rotor radius, rotor solidity as well as the blade tip speed and so on with the method of statistics and analysis. Then engineering method to calculate flight performance of the model and the corresponding weight estimation model is set up, combining with the design technical requirements, flight performance and weight as constraint, using SNOPT software to optimize the overall parameters, get a set of reasonable parameters as a whole.Then put forward the helicopter flight dynamics analysis method that is suitable for the conceptual design, select aerodynamic parameters and established the mathematical model of the flight dynamics. Updated the power calculation method and seted up the flight performance calculation model that is based on the mathematical model of the flight dynamics. Analyzed the effect of overall parameters on flight performance.Updated the weight calculation method also and used SNOPT again to optimize the overall parameters.At last, the helicopter stability analysis model is established, and an analysis on stability with respect to design paraments is set up as the basis of conceptual design parameter correction. End up with a set of conceptual design scheme that could satisfy design technical requirements.