共查询到19条相似文献,搜索用时 62 毫秒
1.
2.
利用汽车理论和连杆机构的有关知识,建立三桥转向汽车的运动模型,在此基础上,对转向梯形、转向摇臂的主要参数进行优化设计,并通过实例验证了该方法的正确性。 相似文献
3.
4.
5.
溢流阀是液压系统中的压力控制元件,其动态性能与其结构参数有很大关系。本文利用控制系统理论,将溢流阀看成为一控制系统,通过建立液压系统压力与系统流量的关系模型,推导其动态刚度函数,以提高溢流阀的动态刚度为目标,借助于MATLAB的优化工具箱进行结构参数优化。 相似文献
6.
考虑可靠度约束的机械结构优化设计 总被引:2,自引:1,他引:1
在结构优化设计中考虑了可靠度约束,同时省去了常规的应力约束,并给出了求解方法.数值结果表明,可靠度约束将使优化结果既经济又安全,是一种具有工程实用价值的优化方法. 相似文献
7.
8.
9.
毕文斌 《机械工程与自动化》2009,(2)
拉臂机构是车厢可卸式汽车的关键系统.以伸缩式拉臂机构为研究对象,以举升油缸的最大拉力最小和最大推力最小为目标函数,建立伸缩式拉臂机构的数学模型,使用ADAMS软件,对其结构尺寸进行了优化设计. 相似文献
10.
11.
12.
3自由度平动并联机构结构参数的优化 总被引:2,自引:1,他引:2
由于 3自由度平动并联机构结构参数的选取对运动平台的工作空间以及并联机构的运动灵活性都会产生影响 ,所以如何选取结构参数是一个很重要的问题。本文求解了当运动平台的工作空间达到指定的范围的基础上 ,运用MonteCarlo方法使得运动灵活性和尺寸值达到最优的结构参数。 相似文献
13.
提出了一种新型的具有无穷对称位置的平面3自由度可重构并联机构。利用闭环矢量方程进行正逆运动学分析,借助蒙特卡罗方法,以综合工作空间、雅可比矩阵条件数及其波动程度的函数为目标通过遗传算法进行杆件优化,之后应用一种离散边界搜索算法计算了相应的定姿态工作空间。通过雅可比矩阵分析机构奇异性,并讨论了可重构机构如何规避位置奇异区域,提出了一种评价机构转动性能的指标并用其检验了机构的转动能力,分析了部分关节故障下的可达工作空间,对比结果验证了新型的可重构并联机构的优越性。 相似文献
14.
Kailash Krishnaswamy Rajesh Rajamani Jong Jin Woo Young Man Cho 《Journal of Mechanical Science and Technology》2005,19(7):1414-1423
This paper develops and evaluates several strategies for structural vibration control with the objective of attenuating broadband
noise inside a rectangular enclosure. The strategies evaluated include model-independent collocated control, model-based feedback
control and a new “modal-estimate” feedback strategy. Collocated control requires no knowledge of model parameters and enjoys
the advantage of robustness. However, effective broadband noise attenuation with colocated control requires a large number
of sensor-actuator pairs. Model-based controllers, on the other hand, can be theoretically effective even with the use of
a single actuator. However, they suffer from a lack of robustness and are unsuitable from a practical point of view for broadband
structural vibration applications where the dynamic models are of large order and poorly known. A new control strategy is
developed based on attenuating a few structural vibration modes that have the best coupling with the enclosure acoustics.
Broadband attenuation of these important modes can be achieved using a single actuator, a limited number of accelerometers
and limited knowledge of a few modal functions. Simulation results are presented to demonstrate the effectiveness of the developed
strategy. 相似文献
15.
对某型吸油烟机用多翼离心风机进行研究,利用CFD软件对风机进行二维数值模拟,分析其在工作过程中的湍流动能、速度等参数的分布情况,找到风机蜗舌处存在的结构问题。采用多级蜗舌的方法对离心风机的蜗舌进行结构改进,利用Fluent软件对不同蜗舌过渡半径下的离心风机进行仿真分析,得到风机的噪声、流量、全压值等参数与过渡半径之间的关系,从而确定蜗舌结构参数的取值。制作改进后风机的样机,对其进行噪声和振动实验测试,并与原风机对比。实验结果表明改进后离心风机的性能有所提升,利用CFD方法对离心风机进行结构改进是可行的。 相似文献
16.
With the development of technology and the change of market demands,the trend in middle and high grade bicycle manufacturing is developed toward small-volume,multi-species,and customer-oriented production.Therefore,human element should be fully considered in design so that the bicycle has the best cycling performance for the specific rider.Currently,customized design is difficult to achieve since feature parameters of the rider are not included in the design.The design of bicycle frame is the most important in bicycle design.The relative positions among the saddle,handlebar and central axis are defined as the bicycle three-pivot,they are the main parameters in bicycle frame design.In conventional bicycle design,frame parameters are merely relevant to bicycle types.On the basis of the principles of biomechanics and ergonomics knowledge,this paper presents a design method for bicycle three-pivot considering feature parameters of the rider by dynamic simulation.Firstly,a dynamic model of rider-bicycle system is built for a special rider,and a serial of simulation experiments is designed by uniform test method.Then,a mathematical model is built between the three-pivot position and the square of lower limb muscle stress by using simulation and regression analysis of the rider-bicycle system.The optimal three-pivot position parameters are obtained by setting the minimal of the square of the lower limb muscle stress as the objective.Therefore,the optimal parameters are gained for the specific rider.Finally,various results are gained for different riders based on the same design process.The function between feature parameters of the rider and the optimum three-pivot position parameters is built by regression.Bicycle design considering biomechanics can be divided into three main steps:calculating the three-pivot position,designing the geometrical structure of the bicycle frame and analyzing frame strength,and selecting appropriate parts and assembling the bicycle.Bicycle design considering biomechanics changes the conventional bicycle design and realizes customized design by considering human element in the design process. 相似文献
17.
介绍了ANSYS软件的优化方法和优化设计的基本步骤,并结合实例,完成了某装备工作装置5节同步伸缩臂的优化设计,在满足工程要求的情况下,得到了合理的截面尺寸,降低了工作装置质量,节省了大量的工程材料。 相似文献
18.
针对石油射孔弹挤压件,对一次挤压成形和先预挤压再终成形两种工艺进行了对比,确定了合理的工艺方案,模具结构采用预应力挤压组合凹模。采用拉丁超立方方法,分别对预挤压和终成形的组合凹模的径向直径比和过盈系数进行了抽样,应用有限元方法对抽样所得的不同结构进行数值模拟,将所得模拟结果作为响应,建立等效应力与组合凹模结构参数的Kriging模型。以降低凹模内壁最大等效应力为优化目标,分别对预挤压和终成形两个阶段的组合凹模结构参数进行了优化分析。应用Kriging模型结合粒子群算法,在结构参数的变量空间内进行全局寻优,得到了各组合凹模最佳的径向直径比和过盈系数,确定出优化的组合凹模结构尺寸,为该挤压组合凹模的设计提供了定量的优化依据。 相似文献