共查询到20条相似文献,搜索用时 125 毫秒
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《机械工程与自动化》2016,(1)
基于某平台车用油气弹簧减振器的结构,建立了油气弹簧刚度的数学模型,利用MATLAB/Simulink软件仿真分析各种结构参数对油气弹簧刚度产生的影响,为优化油气弹簧的刚度性能提供理论指导。 相似文献
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考虑了行星齿轮传动中的各种约束条件的模糊性,建立了行星齿轮传动机构的模糊优化数学模型,将模糊优化和普通优化两种结果进行了比较,表明模糊优化具有明显的优越性。 相似文献
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行星轮系传动机构的模糊优化设计 总被引:1,自引:0,他引:1
考虑了行星齿轮传动中的各种约束条件的模糊性,建立了行星齿轮传动机构的模糊优化数学模型,将模糊优化和普通优化两种结果进行了比较,表明模糊优化具有明显的优越性。 相似文献
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本文提出了运用最优化技术对渐开线圆柱齿轮传动的变位系数进行优化选择的数学模型。作者已依据此数学模型编制了计算机程序,对中心距限定和非限定情况下的各种典型工作情况作了成功的计算。 相似文献
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Modelling uncertainties in an industrial application require a thorough knowledge of their sources and types. Uncertainties can be split into aleatory and epistemic types. Using parametric and non-parametric methods successively can be an adapted approach to model these uncertainties types on a given finite elements model (FEM). However, we propose in this paper to proceed more appropriately by introducing a hybrid approach combining the parametric and non-parametric methods. This approach consists of applying, on a given FEM, parametric and non-parametric methods simultaneously with respect to uncertainties types of each model region. Complexity and size of industrial FEMs often impose model reductions. This introduces necessarily the problem of reduction basis robustness. We are interested in the effectiveness of two methods for model reduction in the case of a hybrid model of uncertainties. We consider the case of component mode synthesis (CMS) based on normal modes of clamped interfaces components. Therefore, we analyze robustness of two methods based on improved Craig-Bampton's basis: the first one is enriched by static residual vectors (ESRV), the second one is a variant of the combined approximations method (VCA) adapted to CMS. Finally, a dynamic application on a railway electric motor stator, allows comparing methods' performances in terms of robustness and gain in computing time. Conclusion highlights relevance of the combined approximations method when using a hybrid approach for modelling uncertainties. 相似文献
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Mattfeldt T 《Journal of microscopy》2011,242(1):1-9
Computer-intensive methods may be defined as data analytical procedures involving a huge number of highly repetitive computations. We mention resampling methods with replacement (bootstrap methods), resampling methods without replacement (randomization tests) and simulation methods. The resampling methods are based on simple and robust principles and are largely free from distributional assumptions. Bootstrap methods may be used to compute confidence intervals for a scalar model parameter and for summary statistics from replicated planar point patterns, and for significance tests. For some simple models of planar point processes, point patterns can be simulated by elementary Monte Carlo methods. The simulation of models with more complex interaction properties usually requires more advanced computing methods. In this context, we mention simulation of Gibbs processes with Markov chain Monte Carlo methods using the Metropolis-Hastings algorithm. An alternative to simulations on the basis of a parametric model consists of stochastic reconstruction methods. The basic ideas behind the methods are briefly reviewed and illustrated by simple worked examples in order to encourage novices in the field to use computer-intensive methods. 相似文献
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企业模型传统的框图表示法不能被计算机识别,从而影响企业模型之间的信息集成,针对这一问题,提出了一种用产品模型数据交换标准中的EXPRESS语言表达企业模型的方法。说明了企业建模中应用EXPRESS语言的可行性及优越性,阐述了用EXPRESS语言中的实体嵌套定义描述企业模型的具体方法,并给出了一个用EXPRESS语言描述汽车制造行业企业参考模型的实例。这样建立的企业模型中的模型信息可以直接通过计算机调用,实现了企业模型之间以及模型与企业各个生产环节之间信息的有效集成。 相似文献
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介绍了游梁式抽油机各部件在运行过程中可能出现的故障情况,各运行状态参数的监测诊断方法。阐述了基于不确定性推理理论及C-F模型算法在抽油机故障诊断中的推理应用,分析研究结果表明,基于C-F模型的不确定性传递算法易于实现抽油机故障的自动诊断,并能提高故障诊断的准确性。 相似文献
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在实际工程应用中,针对如何有效地利用ANSYS软件对齿轮箱螺栓结合面进行有限元建模分析的问题,通过对螺栓结合面建模的难点和关键点—螺栓预紧力的模拟、螺栓接触面的模拟以及螺栓实体有限元模拟的建模方法的研究,系统地阐述了基于ANSYS的7种类型的齿轮箱结合面螺栓有限元建模方法,利用ANSYS软件对其中4种典型的螺栓有限元建模方式进行了静力分析和模态分析,分析比较了不同建模方法在静力学和动力学方面的结果差异。研究结果表明,在仿真效率和仿真精度方面,耦合螺栓模型是一种更为合适的建模方法,但在实际应用中采用实体螺栓有限元模型模拟实际结构中的螺栓时,能够更好的反应实际工作中螺栓连接结构的应力变化,是各种建模方法中的优选方案。 相似文献
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提出了一种基于键合图的参数型模型修正方法。该方法以实测的基于键合图的模态参数和结构的原始设计参数为参考基,寻找满足特征方程且与参考基最邻近的修正过的结构参数。其原理简单,运用方便,只需进行3次迭代。这不仅能应用于力学系统的模型修正,还能推广应用于非力学系统及复杂的多能域耦合系统的模型修正问题。给出的算例证明,运用该方法能取得较好的修正效果 相似文献
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Dr. Sylvester Abanteriba 《摩擦学汇刊》2013,56(4):830-836
This paper describes a model which can be used to analyze the friction losses in the guide shoe of the cross head bearing of a large two stroke diesel engine. It describes further methods by which the friction losses in this component can be significantly reduced. 相似文献