固定吸附床结构对再生和除湿效果的影响

介绍了一种在固定床内通入DN20水管的固定床结构。实验以硅胶为固体吸附材料,向水管中通入不同温度的水,对固定床进行三组实验,利用除湿量、吸附量、吸附能效三个评价指标分析了三组实验的再生能力和吸附效果。结果表明:实验1是再生和吸附效果最佳的一组实验,实验1的解析量是实验2的1.36倍,是实验3的1.12倍;实验1的除湿量是实验2的1.16倍,是实验3的1.17倍。     

基于VRML-Java平台的工程图学网络实验系统研究与实现

对工程图学网络实验系统的设计进行了研究。针对工程图学实验的特点及对实验系统的要求,确定了实验系统基于VRML-Java的构建平台;深入分析探讨了系统中的实验立体构建方法,通过分析VRML场景中形体构造的原理,设计了实验系统的模型数据结构和模型实时变形时数据修改的算法;系统设计了具有较强交互性的操作界面,实现了一个基于Internet的工程图学实验系统。     

包装印刷材料实验课程化与学生创新思维培养

包装印刷材料实验课程化使得单纯的验证性实验转变为设计性实验,学生在综合设计各种材料的性能测试方案时,不仅能提高发现问题、分析问题、解决问题的能力,还能形成创新性思维。以广东工业大学为例,学校施行了包装印刷材料实践课程的教学改革,由此学生制定了制作四层瓦楞纸板并进行性能测试的课程实践方案,取得了较好的效果。实践证明：实验课程化有助于学生创新性思维的形成,值得总结和推广。     

红珠实验软件的设计与开发

红珠实验是一个重要的质量管理学实验，本文在分析红实验软件的目标和需求基础上，对软件实验系统进行了设计，并原原实验加了人机工程学的反应时测试验。用Delphiclient/ServersSuite开发实现了单机版的实验系统。     

Analyzing ordinal data from a split-plot design in the presence of a random block effect

Many industrial experiments involve some factors that are hard to change. In this situation, experimenters often choose to perform an experiment with restricted randomization, such as a split-plot or a strip-plot experiment. In this article, we discuss the analysis of an experiment concerning the adhesion between steel tire cords and rubber. Besides an ordinal response, the experiment also involves one hard-to-change factor. Therefore, the experimenters performed a split-plot experiment. An additional complication of the experiment is that there is also a blocking factor. A proper analysis of the experiment requires the inclusion of random effects in the model to account for its split-plot nature and its blocked nature. The need for random effects and the ordinal response necessitate the use of a mixed cumulative logit model.     

均匀设计方法在包装材料破坏性实验中的应用

设计了均匀实验设计方案的计算机软件系统，该系统可以根据包装材料进行破坏性实验中的多因素多水平的实际需要，给出具体实验设计方案，软件用C语言编写，经具体使用达到了软件预期的设计效果，可以应用于实验设计中。     

索杆式伸展臂系统的实验分析

为了验证索杆式伸展臂高精度、高刚性的特点,制作了一类索杆式伸展臂模型,并设计了相应的实验所需的零重力环境模拟设备。简单介绍了该类型索杆式伸展臂模型的结构和驱动设计,重点分析了其重复展开精度实验和模态实验。重复展开精度实验验证了该类型索杆式伸展臂高精度的特点;在验证了零重力环境模拟设备对伸展臂模态实验可行性的基础上,对伸展臂模型进行了模态实验.通过实验模态频率和计算模态频率的比较,验证了该类型索杆式伸展臂高刚性的特点。     

垂直管氨水降膜吸收传质研究

吸收器是影响氨水吸收式制冷系统的关键部件。对常用的垂直管氨水降膜吸收器进行绝热吸收模拟分析,并将模拟分析结果与实验结果进行了对比。在此基础上,通过实验进一步研究了稀溶液进口过冷和外部吸收冷却对吸收传质的影响,得到稀溶液进口过冷能够促进吸收传质的结论。结果表明:氨水吸收式制冷传质率的模拟结果与实验结果的偏差在20%以内,在冷却吸收和进口过冷的实验测试工况下,吸收传质率提高了132%。     

在学生实验中体现绿色化学的观念

绿色化学实验将是化学实验改革,减少环境污染的新动向。通过对学生开展绿色化学的教育,培养学生的环保观念,并对常规实验进行改进,在化学实验中提高了教师和学生的环保意识。     

Identification of Elastic Properties of Composite Laminates

This article is focused on application of the response surface method (RSM) for solution of structural identification problems. The approximating functions are obtained from the data of deterministic numerical experiment. The numerical experiment is performed in the sample points of experiment design. A minimal mean squared distance Latin hypercube (MMSDLH) design is used in the present paper. For building the response surfaces, a local approximation method is employed. An example of application of the response surface method and experiment design for identification of elastic properties of laminated composite material is discussed. Elastic properties of carbon/epoxy laminate are determined employing the experimentally measured eigenfrequencies of composite plates. The identification functional represents differences between experimentally measured and numerically calculated frequencies, which are dependent on variables to be identified. The identification parameters are five elastic constants of material. The elastic constants identified from vibration test have been compared with the values obtained from independent static test. Good agreement of the results is observed.     

沉管隧道基础灌砂模拟试验

基于相似理论与模拟试验,对沉管隧道基础灌砂的主要参数进行了研究;重点介绍了模拟试验的模型设计、试验流程、试验重点注意事项与试验技术要求,通过试验取得了所需的第一手数据,在对试验成果进行总结分析的基础上,对灌砂施工的主要参数进行了验证分析,其成果可为后续沉管隧道的基础灌砂施工提供参考与借鉴.     

Analysis and computations of oscillating crack propagation in a heated strip

This paper presents a computational analysis and several simulations of an existing experiment, which deals with a quasi-static thermal crack propagation in a glass plate. The experimental observation was that a straight or oscillatory crack propagation occurred depending on the plate width and thermal loading. The goal here is to simulate this experiment with the recent numerical tool such as XFEM. First, the analysis of the settings of the experiment is developed by providing the computed energy release rate of the crack for a wide range of experiment settings parameters. Second, different crack propagations are simulated, and show a good agreement with the experimental observation of straight or oscillatory paths. Third, a study of the results given by the fracture criteria (maximum hoop stress and Local Symmetry criteria) is also presented for this particular experiment in order to evaluate their differences.     

SHPB冲击压缩实验中泡沫塑料应力均匀化过程的数值模拟

对SHPB实验中泡沫塑料的本构关系进行了分段线性化处理，基于一维弹性应力波理论用数值方法对变形过程进行了模拟。结果表明，实验初期试件处于严重的应力不均匀状态；并且由于试件与输入／输出杆的界面处存在波阻抗不匹配现象，实验中后期的应力均匀化程度也无法得到有效提高；若将子弹及输入／输出杆的材料更换为刚度较低的聚合物，可有效地减少波阻抗不匹配的程度，从而使实验中后期的应力均匀化水平得以大幅度提高，但实验所能够达到的最大应变值可能受到限制。     

新型辐射银点炉的研制

介绍了中国计量科学研究院研制的新型银点黑体炉的结构及原理，提出了对复现实验对定点炉性能的要求。对该炉的性能测试及在该炉上进行的复现银点实验表明，该炉完全满足复现实验的要求。文中还给出了荷兰计量研究院使用该炉进行实验研究的结果。     

非线性振冲隔离器油阻尼特性模型及参数识别

为研究油阻尼特性从而实现非线性油阻尼振冲隔离器的自主设计及优化,运用理论建模与实验建模相结合的方法,通过大量科学实验和合理的数据处理,根据数据处理所得数据及显示的图形结果进行油阻尼特性的非线性分析与建模,提出了用于小型电子设备的振冲隔离器的油阻尼特性模型,并进行了部分参数识别。由于体积小,在忽略位移影响的情况下,油阻尼特性模型是按频率分区的,按速度分段的。实验证明,所建模型计算结果比传统线性理论模型计算结果更接近实验数据。     

钢丝绳隔振系统简化模型分析

从工程应用的角度出发,针对钢丝绳隔振系统在随机载荷作用下的加速度响应特点,认为系统在特定状态下可以用线性模型来描述,但其中参数会随试验状态的变化而改变。通过建立不同状态下的系统线性模型,证明了在一定试验量级范围内,用线性模型描述非线性特性是可行的。研究方法及成果便于设计人员参考。     

基于超声频域分析的碳纤维复合材料孔隙率检测

提出了一种基于超声波频谱分析理论建模与实验标定的碳纤维复合材料孔隙率的检测方法,对碳纤维复合材料孔隙率的频域检测法进行实验分析和讨论,并通过具体示例进行验证,证实了该检测方法是可行的。     

The flowability of fine powders in reduced gravity conditions

The extrapolation of Qian’s semi-theoretical relationship for the transition between cohesive and non-cohesive powder fluidization behavior into regions of low gravity is studied and a validation experiment employing fluidization is discussed. The fluidization experiment utilized fine glass and alumina powders in a fluidized bed and was flown onboard NASA’s reduced gravity aircraft. The transition region between cohesive and non-cohesive behavior is determined for the glass and alumina powders at gravity levels of 1.8, 1.0, 0.38, and 0.16 g. The results are compared to Qian’s model and show fair agreement. The fluidization experiment limitations are discussed and a rotating drum experiment that will reduce the experiment uncertainty, provide quantifiable results, and is suitable for flight onboard NASA’s reduced gravity aircraft is proposed. The rotating drum technique determines the characteristic frequency of the powder’s center of area to detect avalanching. The concept is validated by comparing the characteristic frequency obtained from analyzing a cohesive powder to the characteristic frequency obtained from analyzing a flowable powder.     

减速器虚拟拆装实验系统的构建

针对当前实验课程的设备台套数和场地等的不足,分析了国内外虚拟实验室的现状与特点,在研究Cult3D构建交互式三维虚拟场景的过程、方法和相关技术的基础上,以齿轮减速器为例,利用Cult3D及其它相关软件工具,构建了一个基于网络的齿轮减速器虚拟拆装实验,该实验系统具有三维、动态性、交互性、低带宽网络传输等特性,克服了传统实验的不足,在实际应用中取得了良好的效果。     

水下等离子体声源的正交试验设计与分析

水下等离子体声源在民用和军用领域都有广泛的应用,其发声机理和系统最优化设计是当前的研究热点。为了使声源的输出峰值压力y尽可能大,设计了放电电极间距(2mm,3mm,4mm)、储能电容容量(1uF,2uF,5uF)和充电电压(12kV,16kV,20kV)的三因素三水平正交试验方案,严格按照正交试验安排表进行试验,并用直观分析法对试验结果进行分析。结果表明:最优化的试验组合方案为A1B3C2,即放点电极间距2mm,储能电容容量5uF,充电电压16kV,估计出其峰值压力为9.864MPa,并通过试验验证了平均峰值压力为10.165MPa,与正交试验结论相符。该研究成果为水下离子体声源性能试验研究和最优化设计提供了依据。