共查询到19条相似文献,搜索用时 265 毫秒
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液压起升机构起升过渡过程的仿真研究建立并分析了液压起升机构在起升平面内的三质量三自由度的非线性振动模型。用数值方法求解了系统拉动方程级。对不同输入下的系统动态过程进行了仿真研究。给出了起升动载系数的计算方法 相似文献
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运用模糊理论对电动阀门中蜗杆传动参数进行了优化设计。依据模糊优化理论建立蜗杆数学模型,计算出模糊约束隶属函数,并详细地确定了最优水平截集。蜗杆优化设计的结果与实际相比,体积减小了,效率提高很多。采用模糊优化设计出的蜗杆传动比常规优化设计更符合实际情况,在生产实际中显然能够提高其使用价值和社会经济效益。 相似文献
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对四连杆蟹爪式装载机扒取机构优化设计进行了研究。首先,推导出了扒取机构扒爪端点的运动轨迹曲线方程和扒爪位置角公式。其次,根据扒爪端点理想轨迹曲线和理想扒爪位置角要求和结构的特点,建立了四连杆蟹爪式装载机扒取机构优化设计数学模型。最后,用C++语言和复合形优化方法,编写了四连杆蟹爪式装载机扒取机构优化设计程序,并示例进行优化设计,优化结果较令人满意。 相似文献
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本文针对地下运矿车的特点,建立了举升机构优化设计的数学模型。采用复合形优化方法,用TurboC语言编制相应的优化程序,并对UK-12地下运矿车举升机构进行了实创优化设计 相似文献
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对复摆颚式破碎机运动机构优化设计进行了研究。首先,推导出了该机构动颚板上下端点的运动轨迹曲线方程和动颚板与固定颚板之间的啮角公式;其次,根据动颚特性值、破碎机的产量、进料口和排料口的尺寸,以及机构的特点等,建立了复摆颚式破碎机运动机构优化设计数学模型;最后,用C++语言和半惩罚函数优化方法,编写了复摆颚式破碎机运动机构优化设计程序,以PEF400×600型复摆颚式破碎机运动机构为例进行优化设计,优化结果较令人满意。 相似文献
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以矿井井筒制动钢丝绳为研究对象 ,综合运用模糊数学理论及可靠性设计方法 ,建立了制动钢丝绳的 2种模糊可靠性设计数学模型 ,探讨了模糊变量与随机变量同时存在的制动钢丝绳的可靠性设计方法 ,并给出了计算示例。 相似文献
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基于模糊综合评价的磨削过程优化研究 总被引:2,自引:1,他引:1
为了充分考虑平面磨削优化过程中的不确定性问题,采用正交试验设计方法进行磨削试验研究。基于多指标正交试验数据,运用模糊数学理论,建立平面磨削用量与表面粗糙度、金属切除率之间的隶属函数及模糊关系,并对平面磨削过程进行了模糊综合评价。 相似文献
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傅晓锦 《煤炭学报(英文版)》2006,12(1):119-123
Based on the traditional optimization methods about the pressure control spring of the relief valve and combined with the advantages of neural network, this paper put forward the optimization method with many parameters and a lot of constraints based on neural network. The object function of optimization is transformed into the energy function of the neural network and the mathematical model of neural network optimization about the pressure control spring of the relief valve is set up in this method which also puts forward its own algorithm. An example of application shows that network convergence gets stable state of minimization object function E, and object function converges to the utmost minimum point with steady function, then best solution is gained, which makes the design plan better. The algorithm of solution for the problem is effective about the optimum design of the pressure control spring and improves the performance target. 相似文献
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基于深基坑工程的知识和经验,通过对深基坑工程方案综合选优影响因素的模糊聚类分析和模糊综合评判,将方案设计转化为多目标决策系统模糊优化,建立了相应的支护系统方案模糊优化模型,并将其成功应用于实际工程中. 相似文献
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An integral part of open pit optimization is deciding which section of the ultimate pit to mine during a specific period. For a given period there are often operational and marketing constraints that restrict what can be removed or processed. The operational constraints arise from a number of different limitations such as safe slope of internal mining walls, mill and mining capacity. Traditional methods for pushback (phase) design that incorporate these constraints are ad-hoc and can lead to suboptimal solutions. Another important optimization decision that must be made is the cut-off grade to be used for a specific period. In this paper, a new method is presented that generates near maximal expected profit and dynamically defines the optimal cut-off grade for each mining period or pushback over the life-of-mine, thus deciding whether a block is ore or waste during the optimization process. More specifically, a method for converting a fractional linear program solution into an integral solution known as pipage rounding is applied to an integer program formulation of a pushback design optimization problem. The proposed method aims to produce a set of pushbacks in a way that the total discounted profit to be generated through production scheduling is maximized. Two case studies demonstrate the applied aspects of the proposed method. 相似文献