共查询到20条相似文献,搜索用时 437 毫秒
1.
2.
不同的铣削加工工艺参数会影响加工表面形貌和表面粗糙度。考虑灰关联分析与神经网络法的各自优点,提出了一种新的基于灰关联神经网络模型进行表面粗糙度预测的模型。首先利用灰关联分析,将各因子与预测目标作关联性的排序,且把不必要的因子剔除,接着进行神经网络的训练及预测。将所提的预测模型运用到铣削加工的表面粗糙度预测中,构建出表面粗糙度预测系统,最后采用两样本T分配假设检验,以此验证该预测系统的有效性与可行性。 相似文献
3.
4.
5.
分析以往建立表面粗糙预测模型方法的不足,采用响应曲面法(RSM)建立了钢及其合金铣削加工表面粗糙度预测模型。经检验,该模型预测精度高,泛化能力强,且可简便预测铣削参数对已加工表面的表面粗糙度的影响,有助于准确认识已加工表面质量随铣削参数的变化规律,为切削参数的优先和表面质量的控制提供了依据。 相似文献
6.
7.
数据挖掘在质量管理中的应用 总被引:1,自引:0,他引:1
传统的质量管理方法,始终是致力于质量的控制和诊断,主要关注事后处理;本文介绍了应用数据挖掘技术针对生产过程中的质量问题建立预测模型,进行产品质量预测的方法。该方法以生产加工的历史数据为基础,利用关联分析挖掘出生产过程中影响质量的关键因素及其内在联系,进行质量控制和诊断,并使用分类分析建立预测模型,模拟计划排产后的产品质量情况,从而对企业计划排产提供决策支持。 相似文献
8.
本文在预测控制的算法机理上给出了位置控制系统的预测模型,并在此基础上进一步介绍了基于预测控制理论的位置调节器程序的设计方法。 相似文献
9.
10.
为精确预测管材弯曲回弹并设计合理的补偿方案,选择经过优化处理的BP机器学习算法建立预测模型,之后对其开展了控制性能评价。大幅提升了泛化性能并获得更高的预测精度,促进算法更快完成收敛过程。并对模型开展了验证分析。研究结果表明:当以PSO算法优化BP建立预测模型进行预测时跟目标结果间形成了15.7%的平均误差,相对于BP预测模型,大幅提升了预测精度,但会导致计算效率明显下降,所需计算时间接近1.5h。以改进粒子群算法对BP进行优化后,可以有效提升神经网络泛化性能,跟目标值相比平均误差只有6.2%。先对基本PSO算法实施优化处理,再利用优化后的PSO算法调整BP,由此建立得到机器学习预测模型。此模型可以达到高预测精度以及高效率的要求,可以有效满足管材数控弯曲回弹以及补偿的计算需求。 相似文献
11.
12.
13.
灰色马尔柯夫链方法在设备故障预测中的应用初探 总被引:5,自引:0,他引:5
将灰色马尔柯夫预测模型应用于设备运行状态的预测,实践证明,这种预测方法兼有灰色GM(1,1)预测和马尔柯夫概率矩阵预测的优点,尤其适用于随机波动性较大的数据列的预测。这一应用拓广了灰色预测的应用范围。对轴承振动的预测结果表明,该预测模型的预测精度是令人满意的。 相似文献
14.
15.
16.
Sequential monitoring of manufacturing processes: an application of grey forecasting models 总被引:1,自引:1,他引:0
Li-Lin Ku Tung-Chen Huang 《The International Journal of Advanced Manufacturing Technology》2006,27(5-6):543-546
This study used statistical control charts as an efficient tool for improving and monitoring the quality of manufacturing
processes. Under the normality assumption, when a process variable is within control limits, the process is treated as being
in-control. Sometimes, the process acts as an in-control process for short periods; however, once the data show that the production
process is out-of-control, a lot of defective products will have already been produced, especially when the process exhibits
an apparent normal trend behavior or if the change is only slight. In this paper, we explore the application of grey forecasting
models for predicting and monitoring production processes. The performance of control charts based on grey predictors for
detecting process changes is investigated. The average run length (ARL) is used to measure the effectiveness when a mean shift
exists. When a mean shift occurs, the grey predictors are found to be superior to the sample mean, especially if the number
of subgroups used to compute the grey predictors is small. The grey predictor is also found to be very sensitive to the number
of subgroups.
This revised version was published online in May 2005 with a correction to the author’s affiliation. 相似文献
17.
简要叙述了开发符合企业实际需求的营销管理系统的必要性,对企业营销部的日常业务进行详细调研,设计出系统的基本业务流程。构建了系统的总体架构,包括用户层、应用层、接口层和数据层,并且规划了系统的主要功能。通过灰色预测理论中的GM(1,1)模型建立预测模型,对锻件的销售量进行了预测。系统运行的具体结果表明,通过营销管理系统实现营销部的日常业务是可行的,并且有助于减轻营销部的劳动量,提高了工作效率。 相似文献
18.
Ko-Ta Chiang Fu-Ping Chang 《The International Journal of Advanced Manufacturing Technology》2007,33(5-6):480-488
This paper presents a residual modified grey dynamic model RGM(1,3) in order to fit and predict the performance characteristics
of an electro-conductive ceramic (Al2O3+30%TiC) during electrical discharge machining (EDM). Grey system theory is suitable for the system in which some information
is poor, incomplete and uncertain, so it is feasible to study the performance characteristics of EDM with this model. The
RGM(1,3) model is modified to promote the forecasting accuracy of predicting values using the residual grey dynamic model
GM(1,1). The fitted and predicted values of various performance characteristics, including the material removal rate (MRR),
maximum surface roughness (Rmax), and electrode wear ratio (EWR) agreed sufficiently with the experimental data. It is proved
that RGM(1,3) model fitted and predicted the above performance characteristics with a high predicting accuracy. Therefore
this procedure of grey forecasting model is relatively simple and convenient, and it is greatly suited for the analysis of
question which obtained a few experimental data, and acts an auxiliary to calculate the unfinished experimental data. 相似文献
19.
The signal forecasting and processing is an important research direction in the sensors and instrumentation fields. In order to solve the false alarm problem in the diesel vapour detection and alarm system in engine room of ship, this paper builds an pre-alarm model based on grey forecasting theory. An experiment is designed to test the model. The results show that the model can forecasts the concentration of diesel vapour according to the sensor output with a high accuracy of large than 90%. The best recording duration time is determined to 10 min with a higher accuracy of large than 99%. 相似文献