共查询到19条相似文献,搜索用时 31 毫秒
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采用了UG Motion的辅助运动仿真分析方法,在仿真系统运动过程的基础上,详尽分析了该模块内部的运动约束关系,提出了系统运动优化目标,进而求解了系统时序最优安排,并根据求解结果,对驱动凸轮部件进行了动力学相关参数优化,为系统在设定工况下能按较佳的运动和动力特性工作提供了保证. 相似文献
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为了提高加工过程生产率和保证加工精度,以加工过程的恒切削力控制作为研究对象,将信息论原理和神经网络智能控制理论应用于加工过程控制,以信息熵作为加工过程智能控制系统的性能测度能统一各级性能指标,将神经网络作为加工过程控制输入和系统输出的信息传输通道,确定了神经网络基于信息优化的目标函数,推导出了信息优化的三层BP神经网络学习算法,提出了恒力切削过程中基于信息优化的神经网络控制系统框架.通过加工过程的仿真实例证明,与传统自适应神经网络控制方法相比,基于信息优化的神经网络控制方法收敛精确,速度快,振荡小,系统超调量小,具有较好的综合性能.研究结果为信息理论应用于加工过程控制提供了有效途径. 相似文献
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由于复杂系统可靠性函数常常具有非线性的特点,因此如何确定复杂系统各单元冗余数,设计既满足可靠度要求、又使系统成本最小是冗余优化问题中的难点.针对复杂系统的特点,提出了基于量子粒子群算法的求解方法.根据数学模型,详细探讨了量子粒子群算法在系统的可靠性优化计算中应用的可行性,并给出了基于粒子群算法的可靠性的求解策略,同时对桥式系统的可靠性优化设计问题进行分析计算.仿真表明,该算法具有较强的局部搜索能力,与其他方法相比,该算法有较高的搜索效率,能够找到更优的解.最后验证了该算法在复杂系统可靠性优化中的可行性和有效性. 相似文献
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基于VB软件,将喷气织机主喷嘴内部流场建模、流场仿真计算、设计变量与优化目标关系的拟合以及遗传寻优等6个模块进行集成,开发了针对主喷嘴结构尺寸的自动优化设计平台。分析表明:喷嘴芯外端径向距离、喷嘴芯内孔半径、锥形套高度、环形气室径向高度和喉部长度对纱线所受牵引力影响较为显著;纱线在优化后的主喷嘴内部流场中所受牵引力较优化前提升了10.6%,并通过3D模型打印及优化前后的实验测量、分析,验证了优化结果的正确性,提高了主喷嘴的引纬效率。 相似文献
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为实现数控加工制造过程的能耗预测与仿真,采用比能耗法建立了基于Vericut Force模块的机床能耗模型,并结合UG CAM模块与Vericut Force模块搭建了CAD-CAM-ECS能耗仿真平台,实现零件在加工过程中能耗的仿真。结果表明,基于Vericut中过程毛坯(IPW)条件的机床能耗模型可有效预测零件在加工过程中的机床能耗状态,CAD-CAM-ECS能耗仿真平台可实现加工过程能耗仿真并准确映射能耗高的设计特征,为零件的设计及工艺的优化提供依据。 相似文献
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本文介绍了适合于各个吨位汽车起重机起升机构的优化设计软件HACOD。该软件由优化设计模块、运动仿真模块和用户界面生成模块组成,在优化设计模块中,对减速器分别进行了单目标、多目标和模糊优化设计。 相似文献
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砂轮廓形优化对齿轮成形磨削精度和效率的影响至关重要。从齿轮端面建立了完整齿廓数学模型,其中非渐开线过渡部分采用圆弧曲线,利用无瞬心包络法求解了磨削一个齿槽的完整砂轮廓形,推导了左右固定弦齿间点解析式。调整了砂轮安装角以改变砂轮与工件的左右齿面的接触线形状和位置,使左右更对称;调整了固定弦齿间点在齿面上的位置,使之靠近分度圆,接触线分布集中,发散小。基于线性加权和法建立了多目标优化模型,以磨削效率高、左右接触线对称、单齿接触线长度最短为优化目标,利用MATLAB开发优化程序对砂轮廓形进行了优化。通过实例计算验证了调整砂轮安装角和固定点位置对砂轮廓形优化的有效性。 相似文献
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Lee Gabseong Park Jeongseok Choi Dong-Hoon 《Journal of Mechanical Science and Technology》2012,26(2):509-515
The mobile phone has become thinner even while its functionalities are ever increasing. Therefore, the importance of structural
design to prevent structural failure is of increasing importance. To address this situation, a systematic optimization approach
for shape design of a mobile phone folder module is utilized in this research. The structural strength and the exactness of
the folder module assembly are considered as performance requirement of the optimization problem. Five shape parameters of
the folder module assembly are used as design variables. In this research, the finite element method (FEM) is used to acquire
the structural strength of the folder module assembly, and the morphing technique is applied to change the shape of the finite
element (FE) model. However, manually performing the morphing and FEM for the simulation model is complex and time consuming
especially for a model with complicated shape such as the mobile phone. Therefore, shape optimization involving FEM is known
to be very difficult task for actual industrial applications. To overcome this deficiency, two types of approaches are applied
in this research. First, process integration and design optimization (PIDO) technology is applied to integrate and automate
the analysis processes needed for evaluating structural performances. In addition, a metamodel that can substitute for expensive
simulation is employed for the optimization process. From this research, an optimum design for the folder module of a mobile
phone enhancing the structural strength is acquired. In addition to the optimum solution, a metamodelbased shape optimization
procedure which is applicable to practical engineering problem is established. 相似文献
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Octree-based NC simulation system for optimization of feed rate in milling using instantaneous force model 总被引:1,自引:1,他引:0
K. P. Karunakaran Rohitashwa Shringi Deepak Ramamurthi C. Hariharan 《The International Journal of Advanced Manufacturing Technology》2010,46(5-8):465-490
An octree-based (numerical control) NC simulation (Oct-OAC) system developed for end milling has two major applications: (1) NC verification and (2) optimization of the cutting parameters, viz., spindle speed, N (s?1), and feed rate, f (ms?1). Oct-OAC has a geometric modeling module to simulate the geometry of material removal process. Every object in the machining environment such as cutter, instantaneous workpiece, swept volume, etc. is stored as octree, an inexact representation of solid. Using this module, one can predict the geometry of the material removed at any instant of time and update the geometry of the blank subsequently. Optimization of cutting parameters using Oct-OAC is achieved through optimization module using a mechanistic model for computation and prediction of the cutting forces at any instant. The basic input for this module is the geometry of the contact surface between the cutter and workpiece which comes from the geometric modeling module using an octree-based solid modeler. It is through this contact surface that the cutting forces are passed from the workpiece onto the cutter and vice versa. The mechanistic modeling module can predict the instantaneous cutting forces from the instantaneous contact geometry and other process parameters like material combination of cutter–workpiece, parameters defining cutter geometry, and current cutting parameters such as N and f. Using this prediction, it will modify the cutting parameters for maximizing the material removal rate. This way, the mechanistic modeling module does what an adaptive controller will do with the help of force sensing. Therefore, the NC program optimization done using the Oct-OAC system is actually off-line adaptive control. 相似文献
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基于AMESim的电液伺服系统仿真与优化研究 总被引:3,自引:4,他引:3
AMESim是法国IMAGINE公司开发的高级工程系统仿真建模环境,为机械、液压、控制等工程系统提供一个较完善的综合仿真环境。目前该软件已广泛地被GM、Ford、LG、ZF、Bosch等公司采用,成为在汽车、液压和航空航天等研发部门的理想选择。文章首先介绍了AMESim软件的功能与特点,以典型的电液伺服控制系统为例,探讨了基于AMESim的液压系统建模与仿真的方法,研究了基于AMESim/DesignExploration模块和AMESim/matlab接口对AMESim仿真系统进行优化设计的方法,并给出了仿真与优化的结果。利用此方法,借助于AMESim所提供的多领域软件接口.可方便实现大型机电液一体化系统的联合仿真与优化研究. 相似文献