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基于有限元的腰绳系统设计方法 总被引:1,自引:1,他引:1
腰绳是减小履带起重机起臂过程中臂架挠度的重要构件之一,根据这种柔性系统力学复杂性的分析,提出了基于有限元的腰绳系统设计方法,通过实例表明腰绳作用的有效性及方法的合理性. 相似文献
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大吨位履带起重机为了解决长臂架系统在起臂以及大幅度工况下臂架挠度过大的问题,同时增强臂架的稳定性,在臂架系统中加入了腰绳辅助装置.结合弹性稳定理论对带腰绳臂架系统进行非线性分析,推导出变截面臂架系统的挠曲线公式,能够快速计算出任意长度腰绳在任意位置时臂架的挠曲线,简化了腰绳装置的设计. 相似文献
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杨微刘士明王宇诺孟丽霞 《机电产品开发与创新》2021,34(4):108-110
由伸缩主臂、格构式变幅副臂、超起装置、拉索等组成的组合臂架是全地面起重机一种典型的配置,为简化组合臂架系统分析的建模过程,提出一种基于有限元软件的简化计算方法。基于等效惯性矩法,将格构式副臂等效为实腹式结构,建立实际组合臂架结构和等效后的简化结构,并对两种结构进行几何非线性分析。分析结果表明,本文提出的全地面起重机组合臂架系统几何非线性分析的简化分析方法可有效提高全地面起重机组合臂架设计计算的效率。 相似文献
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采用分层优化的思想,以总重量为目标函数,以臂架强度、整体刚度、局部刚度和臂端挠度为状态变量,分别用零阶方法和一阶方法对2 500t环轨起重机主臂架进行了优化设计.主臂架重量减轻了18.5%,效果显著.对比分析了两种优化方法的优缺点及适用范围,为大型桁架式臂架优化方法的选择提供了参考. 相似文献
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起重机伸缩臂截面拓扑化探析 总被引:1,自引:0,他引:1
分析了拓扑优化中材料变密度法及其相关参数对拓扑优化结果的影响,将结构力学中拓扑优化方法应用到起重机伸缩臂的优化设计中,建立了伸缩吊臂的拓扑优化数学模型.利用HyperMesh软件建立了起重机臂架的有限元模型,并利用OptiStruct软件进行优化分析,从而设计出最优的臂架截面拓扑图.分析工作为起重机臂架的结构优化设计提供了一种有效的新思路,其结果为现今流行的大圆角截面和椭圆形截面设计提供了依据. 相似文献
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有限元法计算大吨位伸缩臂起重机起重性能 总被引:6,自引:0,他引:6
起重性能是起重机综合起重能力的体现,准确并快速地计算起重性能对起重机的设计至关重要.将大吨位伸缩臂起重机臂架系统简化为梁,建立了简化模型,分析外载荷,采用几何非线性有限元理论计算某一工况下单元的变形和节点力,由复合应力与许用应力的关系求出额定起重量.通过算例将非线性有限元理论计算出的结果、线性理论计算的结果、样机试验实测出的结果做对比,验证了简化的合理性和此种方法在起重机起重性能计算上应用的可靠性. 相似文献
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Kineto-elastodynamics is the kinematic and dynamic study of mechanisms including the effects of elastic deformation and mass distribution of the links. A new method of kineto-elastodynamic design is developed and illustrated with examples. With this method mechanisms with elastic links can be designed in a systematic way for a desired performance at high speeds. This is achieved by first performing the kinematic synthesis of the mechanism considering its links to be rigid and then proportioning the areas of cross-section of the links optimally to account for the kineto-elastodynamic effects.
In optimization of the design, the objective function to be minimized is taken to be the mass of the mechanism and constraints are imposed on deflections and stresses. The optimization problem is formulated in terms of stepwise linear programming. Using the simplex method, a design with minimum mass is obtained subject to linearized constraints on deflections and stresses. The design is used as an initial design for the next iteration, thus leading to an optimum design in a finite number of steps. Move limits in the form of side constraints are introduced to reduce the error incurred due to linearization of the constraint equations. 相似文献
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根据混凝土泵车的实际工作情况给出了各节臂架最危险工况下理论受力值的计算方法,应用浮点数编码的改进型遗传算法对混凝土泵车臂架系统的油缸连杆机构进行优化布局.经仿真模型检验,得到满足系统运行特性,且各节油缸的长度及推力均有明显减小的优化布局方案,为长臂架混凝土泵车臂架系统的智能设计提供了理论依据. 相似文献
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M. Guedri S. Ghanmi R. Majed N. Bouhaddi 《Mechanical Systems and Signal Processing》2009,23(4):1123-1133
The aims of this work were to quantify the effects of uncertainties of design parameters on the variability of linear and non-linear behaviour of mechanical structures that we wish to optimize, and to calculate optimal and robust solutions resulting from numerical simulations. We propose a method that takes into account the propagation of uncertainties in finite-element models in a multi-objective optimization procedure. This method is based on coupling the stochastic response surface method (SRSM) and the non-dominated sorting genetic algorithm (NSGA). SRSM is based on application of the stochastic finite-element method via the polynomial chaos expansion method or the modal perturbation method. This strategy avoids the use of Monte Carlo simulation, in which costs can become prohibitive in optimization problems, especially when the finite-element models are large and have a considerable number of design parameters. The robust design described here has been developed to obtain an optimum value that is insensitive to changes of design variables within a feasible range. 相似文献