灌装机灌装时间的计算研究

液料的灌装根据灌装与定量方法的不同有多种情况，讨论和分析了各种情况下灌装时间的计算方法，给出了程序框图，编制了简洁实用的设计计算程序。     

旋塞式双定量杯灌装机的设计研究

针对现有单定量杯灌装机的不足，从原理及应用上进行分析研究。研究结果表明，文中研究的旋塞式定量杯灌装机，与单定量杯灌装机相比，可提高效率和便于自动化灌装作业。它对改进现有灌装机和设计新型灌装机具有很好的实际意义。     

液态物料定量灌装机灌装量误差测量结果的不确定度评定与应用

液态物料定量灌装机（以下简称＂灌装机＂）是一种将液态产品按预定量灌注到包装容器内的灌装设备,广泛应用于食品、药品、化工等生产领域,也是保证消费者和生产企业双方利益的重要计量器具。因而正确开展灌装机灌装量误差测量结果的不确定度评定,     

对《液态物料定量灌装机》检定规程有关条款的疑义与探讨

本文结合检定工作实际,针对JJG687-2008<液态物料定量灌装机>检定规程实际应用中有关条款存在的一些疑义进行分析和探讨.     

管理定量计算的新思路——表格式算法

通过几个实例说明在应用现代化管理方法时，表格式算法是一种值得推广的方法，介绍了它比解析法，图象法的优越之处。     

灌装机检定与定量包装商品检测中玻璃量器使用存在的问题

随着我国对定量包装商品的监管力度不断增大,县以上技术机构几乎全部建立了灌装机检定装置,并开展了对定量包装商品的计量检测项目。这些工作的开展无疑为保护广大消费者合法权益提供了有力的技术保证。但由于人员的技术能力不足、技术法规规定不严密、生产企业不懂使用技术等原因,在检测中对玻璃量器的使用存在一些不尽人意之处。现将这些问题总结分析如下,供同行们参考。1存在的问题     

采用遮热罩抽气式热电偶提高炉膛测温精度的分析与计算

通过对使用遮热罩前后热电偶的测量误差进行分析与计算。说明使用遮热罩抽气式热电偶温度计的确可以降低炉膛测温误差，而且增加遮热罩的数目可进一步提高测量的精度。     

采用遮热罩抽气式热电偶提高炉膛测湿精度的分析与计算

通过对使用遮热罩前后热电偶的测温误差进行分析与计算,说明使用遮热罩抽气式热电偶温度计的确可以降低炉膛测温误差,而且增加遮热罩的数目可进一步提高测量的精度.     

玻璃瓶装小剂量粉末状物料装瓶机构的设计

讨论了一种小剂量粉末状物料装瓶机构的设计原理、组成结构。该装置具有动力传动机构、计量充填部分、输瓶机构等，其中有的结构独具特色。     

Thermal-Cyclic Fatigue Life Analysis and Reliability Estimation of a FCCSP based on Probabilistic Design Concept

To study the fatigue reliability of a flip-chip chip scale package (FCCSP) subject to thermal cyclic loading, a Monte Carlo simulation-based parametric study is carried out in the present study. A refined procedure as compared with the recently released Probabilistic Design System (PDS) of ANSYS is proposed and employed in particular. The thermal-cyclic fatigue life of the package is discussed in detail since it is related directly to the reliability of the package. In consideration of the analytical procedure as well as real manufacturing processes, a few geometric dimensions and material properties of the package are assumed random. The empirical parameters used in the fatigue life prediction formula are also assumed random to account for their uncertainties. Numerical calculation is performed following the standard finite element analysis procedure. The result indicates that PDS can indeed be employed to find the cumulative thermal-cyclic fatigue life distribution of the electronic package owing to various uncertainties. The proposed refined design procedure can further improve the accuracy of the quantitative reliability estimation.     

量杯式计量精度离散元法仿真研究

目的探讨离散元法在预估量杯式计量精度中的应用。方法通过分析计量过程中小米颗粒的运动及能量损耗形式,构建具有质量阻尼和刚度阻尼的颗粒接触模型,并对照实测休止角(34.9°),利用此模型试算反演诸如阻尼比等颗粒的细观参数。在量杯规格为26 mm×17 mm、充填速度为150mm/s的条件下,仿真计算每个充填周期中从料斗迁移出的颗粒数目变化(用以表征计量精度),对实验和仿真数据作对比分析。结果仿真休止角为34.7°,与实测值吻合较好。在显著性水平为0.05时,仿真与实验计量精度无明显不同。结论离散元法可用于量杯式计量的分析研究,且模型的构建及参数的设定是合理的     

Prognostic Kalman Filter Based Bayesian Learning Model for Data Accuracy Prediction

Data is always a crucial issue of concern especially during its prediction and computation in digital revolution. This paper exactly helps in providing efficient learning mechanism for accurate predictability and reducing redundant data communication. It also discusses the Bayesian analysis that finds the conditional probability of at least two parametric based predictions for the data. The paper presents a method for improving the performance of Bayesian classification using the combination of Kalman Filter and K-means. The method is applied on a small dataset just for establishing the fact that the proposed algorithm can reduce the time for computing the clusters from data. The proposed Bayesian learning probabilistic model is used to check the statistical noise and other inaccuracies using unknown variables. This scenario is being implemented using efficient machine learning algorithm to perpetuate the Bayesian probabilistic approach. It also demonstrates the generative function for Kalman-filer based prediction model and its observations. This paper implements the algorithm using open source platform of Python and efficiently integrates all different modules to piece of code via Common Platform Enumeration (CPE) for Python.     

基于响应面法的无芯模成形精度研究

目的 提高无芯模旋压零件的尺寸精度.方法 利用双旋轮旋压机床,采用响应面实验优化设计方法,对铝合金零件分别从旋轮进给速度、芯模转速、锥形件的成形角度、坯料与成形件最大开口直径比等方面进行研究,建立其与尺寸精度的预测模型,采用Design-Expert软件对尺寸精度进行回归系数及方差分析,并对此工艺参数进行优化,得到最优...     

利用系统辨识的星敏感器模型修正与测角精度检测

2.中国科学院大学,北京100049)摘要:为了提高星敏感器的测角精度,提出了一种采用系统辨识法对星敏感器模型进行修正以及测角精度检测的方法。首先分析了星敏感器的理论测量模型以及像面坐标与星点目标的空间位置关系,然后给出了用模型修正来提高星敏感器测角精度的原理和数学模型。修正模型由系统辨识方法得到,同时为了提高辨识精度,文中采用将星敏感器像面划分为多个区域,每个区域单独建模辨识的方式。最后利用某星敏感器进行了实验,利用该方法进行模型修正后,星敏感器的测角精度为σx=1.68″、σy=1.91″,而修正前的测角精度为σx=17.43″、σy=23.46″。结果表明,采用该方法可以使星敏感器测角精度得到大幅提高,同时也完成了测角精度的检测。     

铝合金超声波钎焊过程中液态钎料的填缝及界面润湿行为

研究了超声波振动作用下6061Al和2024Al合金焊缝中液态钎料的填缝过程,并分析了加热温度、焊缝预留间隙值对该过程的影响。结果表明,超声波振动作用下液态钎料的填缝行为与传统毛细填缝行为有很大差别,该条件下液态钎料在不润湿母材的基础上就迅速发生填缝过程,钎料初始液-气界面为凸状;随着填缝进行,填缝速度有所下降,填缝前沿钎料/母材界面润湿程度提高,钎料液-气界面形状转变为凹状。加热温度对超声波作用下液态钎料的填缝过程无明显影响,焊缝预留间隙值增加,钎料填缝长度减小,液-气界面形态发生变化。     

Probabilistic models of fatigue crack propagation and their experimental verification

To study the fatigue crack growth problems and to emphasize the variability of the growth curves in addition to their average growth trend, three stochastic fatigue crack growth models are presented. These models include the Markov chain model, Yang's power law model and a polynomial model. Experimental work is carried out to produce the required fatigue crack growth data, which are then used for verification of the models. Two sets of statistically meaningful data, one under constant-amplitude loading and the other under random loading, are produced. Numerical study shows that all three models can be used to depict the experimentally obtained fatigue crack growth data with certain degrees of accuracy. However, out of the three models, one is superior to the others concerning a certain data set while the other two models are better for other data sets. Comparison and comments on employing individual model are made at the end of the paper based on experience gained in the present study.     

Evaluation of the probability distribution of crack propagation life in metal fatigue by means of probabilistic finite element method and B-models

In this paper, a new model for the prediction of the cumulative distribution function of fatigue life of structural elements during the crack propagation stage is established. This problem is considered as a cumulative damage process following the probabilistic approach of Bogdanoff and Kozin (B-models). The initial and final crack lengths, the crack propagation angle, the material fracture and elastic parameters and the external loads have been the random variables considered here. The theoretical bases of the model and the procedure to construct it are described in the forthcoming paragraphs such as several examples for mode I problems including the comparison with experimental results.     

Modeling of Coalescence of Dispersed Surface Cracks. Part 1. Probabilistic Model for Crack Coalescence

A probabilistic model was developed for coalescence of cracks randomly dispersed on the surface and having uniform orientation and statistically nonuniform length. The model makes it possible to calculate the probability of coalescence of any pair of closely located cracks with allowance for the interaction of the strain fields. The model has been modified for the case of coalescence of cracks having the biggest length in the sample. The initial parameters for determining the probability of coalescence are: mathematical expectation of the length of cracks, their surface density, the magnitude of the damaged area of the material (size-scale factor), and the level of the acting stress. The model obtained can be used to predict the life of a component from the criterion of formation of critical cracks by coalescence of dispersed defects.