基于MATLAB的双圆弧圆柱齿轮传动优化设计

将优化数学理论与MATLAB软件相结合,以双圆弧圆柱齿轮传动为研究对象,进行优化设计。优化中以传动中心距和齿轮体积最小为目标函数,提出边界和强度约束条件,对计算系数进行取值构建出优化数学模型,编写优化计算程序,利用fmincon和bnb20函数对其进行优化求解,得到优化方案,与初始设计方案相比,新设计方案传动中心距减小24%,齿轮体积减小27%,优化效果明显,可为设计选型提供必要参考。

链传动的优化设计

将内点罚函数法应用于链传动的优化设计中,先用内点罚函数法建立寻优数学模型,找出设计变量、目标函数和约束条件,通过迭代得到最优解,并举例说明之。

汽车传动系的优化设计

影响汽车动力性和燃油经济性的因素很多，如何进行匹配与选择是目前各汽车生产厂家所面对的问题。也是当前所研究的热门课题。文中主要从变速器的速比和后桥主减速比的匹配通过理论与试验相结合的方法来对一款商务车的传动系优化设计，期望使整车的动力性和经济性匹配最好。

椭圆齿轮运动的模糊优化设计

将模糊优化设计方法应用于椭圆齿轮传动设计,考虑各变量的模糊性,建立了以达到确定传动比为目标函数的椭圆齿轮传动的模糊优化设计的数学模型,探讨了求解方法.并针对实例进行了优化设计,有一定的实用价值.

基于有限元法的汽车传动轴优化设中

以某轻型载货汽车为例，应用ANSYS软件对传动轴进行了建模、定义单元类型、网格划分、求解，得出了传动轴上节点的最大位移、最大受力情况；并对传动轴进行了简单的优化设计。

混合整数非线性规划的自适应变异差分进化算法

提出了一种求解混合整数非线性规划(Mixed integer nonlinear programming,MINLP)的混合差分进化(Differential evolution,DE)算法。为提高DE算法的优化性能,设计了混沌初始化种群、可平衡全局探索与精细开采能力的混合变异版本、基于种群进化停滞代数记录的自适应二次变异算子等新型策略。将前述策略融入DE算法,形成面向MINLP的自适应变异差分进化(Adaptive mutation differential evolution,AMDE)算法。6个MINLP数值实例的对比实验表明了新算法的有效性和可靠性。最后,应用AMDE算法求解齿轮传动体积最小化工程优化设计实例,显示了该算法的工程应用价值。

Effects of structural parameters and rigidity of driving diaphragm on flow characteristics of micro valveless pump

The structure and operating principle of micro valveless pump were investigated theoretically and experimentally. The mathematical model of pressure and flow rate within the micro nozzle/diffuser was established to analyze the effects of nozzle/diffuser parameters on the output flow rate of the micro valveless pump.The experiments were carried out with different structural parameters, driving frequencies, vibration amplitudes and stiffness of the driving diaphragms. Effects of the structural parameters and driving conditions on the operation performance of the pump are discussed in detail. The work provides useful reference for structure optimization selection of the driving diaphragm of micro valveless pump.

Optimum Determination of Partial Transmission Ratios of Three-Step Helical Gearboxes for Getting Minimum Cross Section Dimension

This paper presents a new study on optimum calculation of partial ratios of three-step helical gearboxes. The chosen objective function is the cross section dimension of the gearbox. In solving the optimization problem, the design equation for pitting resistance of a gear set was investigated and equations on moment equilibrium condition of a mechanic system including three gear units and their regular resistance condition are analyses. From the results of the study, effective formula for determination of the partial ratios of three-step helical gearboxes is introduced. As the formulas are explicit, the partial ratios can be calculated accurately and simply.

Aerodynamic Optimum Design of Transonic Turbine Cascades Using Genetic Algorithms

This paper presents an aerodynamic optimum design method for transonic turbine cascades based on the Genetic Algorithms coupled to the inviscid flow Euler solver and the boundary-layer calculation.The Genetic Algorithms control the evolution of a population of cascades towards an optimum design.The fitness value of each string is evaluated using the flow solver. The design procedur6 has been developed and the behavior of the genetic algorithms has been tested. The objective functions of the design examples are the minimum mean-square deviation between the aimed pressure and computed pressure and the minimum amount of user expertise.