符合尾随边缘形态变化的优化设计——毕业设计外文翻译、中英文翻译.doc

外文原文:
Optimal Design pliant Trailing Edge for
Shape Changing
Abstract: Adaptive wings have long used smooth morphing technique pliant leading an d trailing edge to improve their aerodynamic paper introduces a systematic approach to pliant structures to carry out required shape changes under distributed pressure order to minimize the deviation of the deformed shape from the target shape,this method uses M ATLAB and ANSYS to optimize the pliant mechanisms by way of the ground approach and ic algorithm (GA)to remove the elements possessive of very low the optimization process,man y factors should be considered such as air loads,input displacements,and geometric nonlinearities。Direct search method is used to locally optimize the dimension an d input displacement after the GA optimization。The resultant structure could make its shape change from 0 to data of the model confirm s the feasibility of this approach.
Keywords: adaptive pliant mechanism;ic algorithm ;topology optimization;distributed pressure load;geometric nonlinearity
1 Introduction:
As conventional airfoil contours are usually designed with specific lift coefficients and M ach numbers,they could not change in accordance with the environment and Austin indicated that the variable camber trailing edge would produce the drag about sixty percent less than the conventional fixed camber airfoil
There are three methods used to design able camber is conventional hinged mechanism,which,however, will create discontinuities over the wings surface leading to earlier airflow separation an d drag increase. The others are smart material and pliant mechanism,of which both could realize smooth shape to pliant mechanism,the smart—material—made actuators have many disadvantages,such as deficient in energy ,slow in response,strong in hysteresis,limited by temperature,and
difficult to control too many ac