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基于串行通信的分布式数据采集系统设计研究 总被引:1,自引:0,他引:1
介绍基于串行通信的分布式数据采集系统(DDAS)的功能结构和工作原理,研究主处理机与前端数据采集机间通信控制器的设计、通信协议及通信过程中应答信号的设置,给出了前端数据采集机的硬件电路,结合温度测试实例分析采集的数据,验证DDAS的可行性。 相似文献
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介绍压缩机性能测试的原理和实验系统,并成功开发基于组态王的CAT系统,具有自动控制、数据采集、处理、储存和远程监控等功能。 相似文献
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LabVIEW实现的制冷及低温实验测试系统开发 总被引:2,自引:1,他引:1
LabVIEW是一种简洁的图形编程语言。本文介绍了自行开发的基于LabVIEW软件开发平台的实验测试系统,包括硬件组成和软件实现。该测试系统仪器精度高,响应快,并具有系统参数设置、数据采集与处理、数据及曲线显示、信号处理与分析计算、文件导人与数据保存以及远程通信等多种功能,能满足对制冷及低温实验中压力、温度、制冷量等参数自动测量的要求,并具有可移植性和延续开发能力。 相似文献
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介绍了一个数据采集器测试系统的构成及其软件设计,并对系统软件的设计方法、主要功能和主要特色进行了讨论。 相似文献
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Big Data is reforming many industrial domains by providing decision support through analyzing large data volumes. Big Data testing aims to ensure that Big Data systems run smoothly and error-free while maintaining the performance and quality of data. However, because of the diversity and complexity of data, testing Big Data is challenging. Though numerous research efforts deal with Big Data testing, a comprehensive review to address testing techniques and challenges of Big Data is not available as yet. Therefore, we have systematically reviewed the Big Data testing techniques’ evidence occurring in the period 2010–2021. This paper discusses testing data processing by highlighting the techniques used in every processing phase. Furthermore, we discuss the challenges and future directions. Our findings show that diverse functional, non-functional and combined (functional and non-functional) testing techniques have been used to solve specific problems related to Big Data. At the same time, most of the testing challenges have been faced during the MapReduce validation phase. In addition, the combinatorial testing technique is one of the most applied techniques in combination with other techniques (i.e., random testing, mutation testing, input space partitioning and equivalence testing) to find various functional faults through Big Data testing. 相似文献
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针对数据库和XML文件不同数据源类型及数据的不同访问机制对.NET Web应用程序性能测试的影响进行分析,通过ACT测试工具得出了实例系统的性能测试数据,说明数据访问对.NET Web应用程序性能测试影响的主要因素. 相似文献
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Mining penetration testing semantic knowledge hidden in vast amounts of raw penetration testing data is of vital importance for automated penetration testing. Associative rule mining, a data mining technique, has been studied and explored for a long time. However, few studies have focused on knowledge discovery in the penetration testing area. The experimental result reveals that the long-tail distribution of penetration testing data nullifies the effectiveness of associative rule mining algorithms that are based on frequent pattern. To address this problem, a Bayesian inference based penetration semantic knowledge mining algorithm is proposed. First, a directed bipartite graph model, a kind of Bayesian network, is constructed to formalize penetration testing data. Then, we adopt the maximum likelihood estimate method to optimize the model parameters and decompose a large Bayesian network into smaller networks based on conditional independence of variables for improved solution efficiency. Finally, irrelevant variable elimination is adopted to extract penetration semantic knowledge from the conditional probability distribution of the model. The experimental results show that the proposed method can discover penetration semantic knowledge from raw penetration testing data effectively and efficiently. 相似文献
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石未凡 《中国材料科技与设备》2012,(1):95-98
物质的热容测试对热分析数据有着重要影响,也是物质本身固有属性的重要表征特性,因此热容的测定得到越来越多人的关注。本文通过介缉连续测试热容法、阶梯测试热容法、液体热容测试法和滴落测试热容法等多种热容测试方法,展示了热容测试技术的发展及改进。 相似文献
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郭立伟 《中国材料科技与设备》2006,3(4):106-108
本文介绍了自动超声波检测成像系统的工作原理及应用状况,比较详细地介绍了目前国内设计开发的最先进的自动超声波检测成像系统的设备组成和所采用的信号采集及处理和检测数据传输及记录的一些关键技术。这套设备采用全数字式超声波信号显示和处理方式,可以为超声波检测的分析提供必要的数据,从而精确地对缺陷进行定位和定量,使检测结果更为准确和直观。 相似文献
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细铜棒内部缺陷超声自动检测系统设计 总被引:3,自引:2,他引:1
目的 检测细铜棒内部缺陷 .方法 采用组合超声检测法 ,结合多探头数据融合技术 .结果 实现了细铜棒内部缺陷的定性、定量自动检测 .结论 利用组合超声法和数据融合技术可以提高细铜棒的检测精度 . 相似文献
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爆速是研究炸药性能的重要指标,虽然传统的爆速测量方法操作简单,但是由于测量点少、精度低,经常无法采集到有效的数据,而且也很难反映出炸药在整个爆轰过程中爆速的变化。为了弥补目前炸药爆速测量的缺陷,提出一种爆速的连续测量技术,采用高速数据采集与连续电阻丝探针相结合的方法来测试水下爆炸、工程爆破、爆炸焊接等工况下的各种炸药爆速,爆轰行程每米测量点数为2.5万,测量范围从50 m/s到10 000 m/s,测量精度可以控制在小于1.0%,通过数学拟合算法和编制程序对测量数据信号进行图形可视化分析,并绘制出连续行程-爆速分析曲线,可以满足不同形式炸药爆速测量的试验研究。 相似文献