共查询到19条相似文献,搜索用时 203 毫秒
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该文基于灰色系统中的灰色关联分析理论,建立了斜拉桥索面索力状态评估方法,并以某斜拉桥索力实测值为例进行计算分析,计算中将三种不同情况下的索力值作为灰色关联分析中的参考序列,进行对比分析。结果表明,灰色关联分析方法可较好地应用于斜拉桥索力状态评估;若能考虑混凝土收缩徐变等影响,则以优化索力作为灰色关联分析参考序列的评估结果能更好地反映索力实际状态。 相似文献
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文章分析了模糊综合评价法和灰色关联分析法的原理,根据立交方案评价中具有模糊性和灰色性并存的特点,提出将模糊综合评价法和灰色关联分析法结合起来形成模糊综合量化评价方法并应用于水盘高速公路互通式立交方案评价,结果证明,采用模糊综合量化评价方法对于公路立交评价具有较高的可行性和良好的适用性。 相似文献
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灰色关联分析在公路工程建设方案选优中的应用 总被引:1,自引:0,他引:1
公路工程建设方案的选择是一个多目标,多属性的决策问题,灰色理论中的灰色关联度排序机理明确,计算简便,在较大程度上消除了主观随意性,可为多目标多属性方案的决策和措施选择提供了科学依据,本文介绍了灰色关联分析在公路建设方案选优中的应用方法,并给出了计算实例,针对原灰色关联分析中关联度的规范性以及无量纲化方法和分辩系数的选用的影响等理论问题提出了解决办法。 相似文献
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高速公路养护机械配置方案综合评估 总被引:3,自引:0,他引:3
运用灰色关联分析和层次分析相结合的方法建立了高速公路养护机械配置方案综合评价指标体系,提出了高速公路养护机械灰色关联评价比选模型,同时结合实例说明了这种方法对养护机械配置方案综合评估的合理性。 相似文献
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针对不同类型岩石在不同高径比尺寸下进行单轴抗压试验研究,运用经过数据标度化方法改进后的灰色关联分析法,对岩石横向和纵向尺寸变化对抗压强度的影响进行灰色绝对、相对以及综合关联分析.利用灰色理论分析得知岩石横纵尺寸变化在众多影响抗压强度的因素中十分重要,并提出了其关联分析及结果运用.研究得知完整岩石纵向尺寸变化对抗压强度影... 相似文献
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介绍了灰色系统及灰色关联分析的有关理论,探讨了运用灰色关联分析法处理汽车主观评价数据。应用示例表明了该方法是可行的,可以完成汽车主观评价数据的综合量化分析,并较好地提取了对标样车的载荷设计基准。 相似文献
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针对不同类型岩石在不同高径比尺寸下进行单轴抗压试验研究,运用经过数据标度化方法改进后的灰色关联分析法,对岩石横向和纵向尺寸变化对抗压强度的影响进行灰色绝对、相对以及综合关联分析。利用灰色理论分析得知岩石横纵尺寸变化在众多影响抗压强度的因素中十分重要,并提出了其关联分析及结果运用。研究得知完整岩石纵向尺寸变化对抗压强度影响大于横向尺寸变化,岩样抗压强度基本随着岩石横向尺寸及纵向尺寸的增大而成增大趋势。 相似文献
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针对研制出的LPG 柴油双燃料发动机的机械式和电子式LPG供气系统 ,采用模糊数学理论 ,以LPG供气方式及供油提前角为指标 ,根据对改装后的YC6 10 8Q柴油机的NOx ,HC ,CO ,PM ,额定功率及最大扭矩的测量结果 ,利用所建立的模糊评估函数 ,对双燃料发动机的改装方案进行了模糊优选 相似文献
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A. Karnwal M. M. Hasan N. Kumar A. N. Siddiquee Z. A. Khan 《International Journal of Automotive Technology》2011,12(4):599-610
This paper presents an experimental study that involves an application of the Taguchi method and grey relational analysis
to determine the optimum factor level to obtain optimum multiple-performance characteristics of a diesel engine run with different
low-percentage thumba biodiesel-diesel blends. Four factors, namely, low-percentage thumba biodiesel-diesel blend, compression
ratio, nozzle opening pressure and injection timing were each considered at three levels. An L9 orthogonal array was used to collect data for various engine performance- and emission-related responses under different
engine loads. The signal-to-noise (S/N) ratio and grey relational analysis were used for data analysis. The results of the
study revealed that the combination of a blend consisting of 30% thumba biodiesel (B30), a compression ratio of 14, a nozzle
opening pressure of 250 bar and an injection timing of 20° produces maximum multiple performance of a diesel engine with minimum
multiple emissions from the engine. 相似文献
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为提高柴油机故障诊断速度和精度,提出了基于改进多尺度核独立元分析与量子粒子群优化核极限学习机的故障诊断方法。首先利用固有时间尺度分解对缸盖振动信号进行多尺度时频分解,并根据故障敏感度参数筛选有效分量以实现振动冲击特征增强;然后利用核独立元分析消除有效分量间的频带混叠,分离故障敏感频带,并提取各频带的AR模型参数、多尺度模糊熵和标准化能量矩构造联合故障特征向量;最后建立基于量子粒子群优化的核极限学习分类器实现柴油机故障诊断。试验结果表明,该方法有效增强了缸盖振动信号中的故障敏感特征,提高了柴油机故障诊断速度和精度,故障分类准确率达到98.45%。 相似文献
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The present study attempts to address the challenges of the multiobjective optimization problem of the BSFC-NOx-PM trade-off paradox of an existing diesel engine by harnessing the synergetic benefit of PM and BSFC reduction through CRDI operation and simultaneous NOx reduction by EGR application. Load, FIP and EGR were chosen as the input parameters while NOx, PM and BSFC were the response variables. In order to reduce the experimental effort, the Taguchi L16 orthogonal array technique was employed to obtain the corresponding values of the response variables. The grey relational analysis coupled with fuzzy logic has been employed as the optimization routine. The optimal combination of the input parameters corresponding to the calibrated values of the response variables were obtained by employing the Grey-Fuzzy Grade and S-N ratio strategy as a performance index. The computed optimal combination so obtained were further validated through actual experimentation. EGR was found to be the most influencing factor in the present optimization endeavour. The study also established that the Grey-Fuzzy-Taguchi method was not only comparable but superior to the Grey-Taguchi method usually employed for such optimization studies. 相似文献
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In accordance with the development of hardware configurations in diesel engines, research on model-based control for these systems has been conducted for years. To control the air management system of a diesel engine, the exhaust manifold pressure should be selected as one of the control targets due to its internal dynamic stability and its physical importance in model-based control. However, it is difficult to measure exhaust pressure using sensors due to gas flow oscillation in the exhaust manifold in a reciprocated diesel engine. Moreover, the sensor is too costly to be equipped on production engines. Hence, the estimation strategies for exhaust manifold pressure have been regarded as a primary issue in diesel engine air management control. This paper proposes a new estimation method for determining the exhaust manifold pressure based on compressor power dynamics. With its simple and robust structure, this estimation leads to improved control performance compared with that of general observers. To compensate for the compressor efficiency error that varies with turbine speed, some correction maps are adopted in the compressor power equation. To verify the control system performance with the new estimator, a HiLS (hardware in the loop simulation) of the NRTC mode is performed. Experimental verification is also conducted using a test bench for the C1-08 mode. 相似文献