排序方式: 共有76条查询结果,搜索用时 15 毫秒
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多卷扬是大吨位履带起重机起升机构常用的形式,其同步性能的控制和实现是整机安全作业的关键。利用ADAMS和Matlab软件,建立了四卷扬起升机构的仿真模型和控制模块,完成了起升过程的联合控制仿真。结果表明,合理的控制策略及参数设置能很好地保证起升过程中各卷扬的均载,保证吊重的平稳起升。 相似文献
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介绍了一种以名义应力法为基础,对疲劳寿命进行计算的方法,并应用有限元分析软件ANSYS建立了高空作业车伸缩臂有限元模型,提出了用一种基于ANSYS/fe-safe疲劳分析软件来预测分析修造船用高空作业车疲劳寿命的方法. 相似文献
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结构的损伤识别可作为一个优化问题来处理。本文直接应用频响函数(FRF)进行结构的损伤识别。通过对FRF的主成分分析(PCA)实现数据压缩和特征提取,建立基于压缩FRF的优化目标函数。为了提高算法的收敛速度,以结合局部搜索算法(LS)的遗传算法(GA)为优化工具,并进一步结合子结构识别法来求解。基于桁架的计算结果表明,这种方法具有很好的鲁棒性和识别效果。 相似文献
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解析法以其方便、简洁、程序化强的特点在伸缩臂腹板局部稳定性分析中被广泛应用.对于由不同厚度板组成的腹板,解析法通常取板厚平均值来计算其局部稳定性,计算结果偏于保守.为了寻求更为精确的等效板厚计算方法,本文提出一种对腹板上下槽板按不同权重系数进行加权平均的算法,采用有限元法验证算法的计算精度,并给出较为符合实际情况的权重... 相似文献
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直臂式高空作业车动力学分析 总被引:3,自引:0,他引:3
针对高空作业车变幅时摆动较大,这里采用了分析力学的方法对伸缩直臂式高空作业车进行了动力分析,得出了相关参数变化对振动的影响,为高空作业车参数的选取和使用提供了理论依据。 相似文献
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Discrete element simulation of mechanical characteristic of conditioned sands in earth pressure balance shield tunneling 总被引:2,自引:2,他引:0
The discrete element method (DEM) was used to simulate the flow characteristic and strength characteristic of the conditioned
sands in the earth pressure balance (EPB) tunneling. In the laboratory the conditioned sands were reproduced and the slump
test and the direct shear test of the conditioned sands were implemented. A DEM equivalent model that can simulate the macro
mechanical characteristic of the conditioned sands was proposed, and the corresponding numerical models of the slump test
and the shear test were established. By selecting proper DEM model parameters, the errors of the slump values between the
simulation results and the test results are in the range of 10.3%–14.3%, and the error of the curves between the shear displacement
and the shear stress calculated with the DEM simulation is 4.68%–16.5% compared with that of the laboratory direct shear test.
This illustrates that the proposed DEM equivalent model can approximately simulate the mechanical characteristics of the conditioned
sands, which provides the basis for further simulation of the interaction between the conditioned soil and the chamber pressure
system of the EPB machine. 相似文献