TJ740汽车发动机罩铰链机构的优化设计.docVIP

各专业完整优秀毕业论文设计图纸 摘 要 汽车发动机铰链机构的功能是为了发动机罩能正常地开启,起支撑的作用,能使发动机罩达到一个开启角度,对铰链机构的要求，除了结构简单、制造方便、制造成本低、开启方便、支撑可靠，还必须保证发动机罩有足够的开度，并在开启过程中不与车身其他部分干涉。 在分析了固定部件和需要开启的发动机罩运动轨迹的基础上，测绘了TJ740型汽车发动机罩六连杆铰链机构，对每个杆件的作用、运动轨迹、作用力进行了详细分析，建立了该六连杆铰链机构的运动模型和力学模型, 然后应用优化软件MATLAB来进行机构参数优化设计，建立了为了达到机构尺寸最小的目标函数，以机构的运动方程和力学方程为约束方程，确定方程的设计变量、各个参数的取值范围。编写了机构的MATLAB优化软件程序，优化出设计变量，最终应用尺寸参数优化结果，设计了六连杆铰链机构。 为了达到减轻整个机构重量的目的，对每个杆件进行受力分析，建立弯矩方程，确定最大截面，以保证达到所需求的强度要求。本次设计利用了UGCAD建立了发动机罩六连杆铰链机构的三维数据模型，并将其绘制为二维图纸。 关键词：发动机铰链机构，Matlab, 优化设计，强度 The Optimization Design of Tj740 Automobile’s Hinge Mechanism for Engine Hoods ABSTRACT Automobile Engine hinge of their functions is to the hood can be opened to normal, or play a supporting role, can achieve a hood opening angle of the hinge, in addition to simple structure, convenience, low cost of manufacture. Open convenient, reliable support, we must also ensure that there are sufficient hood open, and the opening of the process and not to interfere in other parts of body. The analysis of the fixed components and the need to open the hood trajectory on the basis of Mapping the TJ740 automobile hood link hinge six bodies, each bar to the role trajectory, Force conducted a detailed analysis, the 6-link hinge model of the movement and mechanical models, then the MATLAB optimization software to optimize the design parameters agencies, In order to achieve the establishment of the body size of the smallest objective function to the equations of motion and mechanical equation of constraint equations, determining equations, the design variables, parameters of the value range. Prepared the MATLAB software optimization procedures, and optimize the design variables, the final application size parameter optimization, Design of 6-link hinge agencies. To reduce the weight of the whole organization, the purpose of each bar were presented to establish moment equation, identify the largest section to reach the demand by the strength of demand. The design UGCAD use of a hood h