共查询到19条相似文献,搜索用时 156 毫秒
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针对多种型号热电池动态性能测试的通用性和移动性要求,采用模块化结构,通过计算机实现测试过程的自动化。利用GPIB接口与计算机的通信,实现了计算机对程控直流电源、电子负载、WR1000热敏阵列记录仪的控制及数据的采集和自动储存,测试系统可以随意切换或裁剪设备以适应移动测试要求,使热电池动态性能测试系统具有高精度、多负载、通用性、可移动性和自动化的特点。 相似文献
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通过分析流体边界层分离原理,针对分离点附近物面剪应力的变化规律,提出了用微型热敏传感器阵列在被测物体表面贴附完成实时分离点检测的测量方案.同时,提出了基于流体壁面剪应力分布测量边界层分离点原理的一维微型热敏传感器阵列输出信号的处理方法,并利用柔性一维热敏传感器阵列在标准翼型NACA0012上进行低速风洞试验,得到流体剪应力对应翼型表面位置传感器上的输出电压数据.通过对试验结果进行数据处理,验证了该判定方法对分离点位置判定的正确性和有效性. 相似文献
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文章介绍了车辆状态信息显示处理系统及cAN总线在现代客车上的应用。该系统是以AT89S52单片机 SJA1000CAN控制节点十SED1335液晶显示控制器为核心,并辅以扩展电路构成的汽车行驶记录仪。在研究、参考国内外现有行车记录仪的基础上,充分利用现代电子、计算机、传感测控等方面的技术成果,开发了新一代基于CAN总线的多功能行车记录仪。该系统不仅具有检测、超限报警等常规功能,而且具有点阵LCD中文显示功能.数据存储功能,以及控制功能。实现了更高的智能水平。 相似文献
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在计算机高速测控的时代下,运用AVR单片机ATMEGA16做为主控制芯片,在芯片内建立打印字库,使用FAN8200做为热敏打印机走纸系统步进电机的驱动芯片,以日本精工LTP1245高速热敏打印机芯,用计算机控制程序对移位实现数据加载,在测量与控制模式下命令走纸步进电机所需的PWM驱动信号,并通过计算机设计了自定义的字符库,简化了硬件结构,降低了系统成本。通过本课题的研究,探索了单片机技术的最新发展方向以及AVR单片机对微型热敏打印机的控制方法,建立简单、实用、低成本的微型热敏打印系统并取行很好的应用价值。 相似文献
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本文介绍了以PICl6F688型低功耗单片机为控制器的温湿度记录仪的设计与实现,采用数字式传感器对温湿度进行测量,并将所测量数据实时存入外部存储器EEPROM(24L C512)中。系统采用3V锂电池供电,采集数据间隙系统处于休眠状态,降低了系统能量消耗。开始记录数据之前,采用VB设计操作软件通过计算机串口对记录仪参数(记录时间和开启记录仪方式)进行设置,测量数据时可脱离上位机单独运行。该记录仪具有稳定可靠、体积小、量化误差小、响应速度快、便于携带和适用面广等特点。 相似文献
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The classical waveform relaxation (WR) methods rely on decoupling the large-scale ODEs system into small-scale subsystems and then solving these subsystems in a Jacobi or Gauss–Seidel pattern. However, in general it is hard to find a clever partition and for strongly coupled systems the classical WR methods usually converge slowly and non-uniformly. On the contrary, the WR methods of longitudinal type, such as the Robin-WR method and the Neumann–Neumann waveform relaxation (NN-WR) method, possess the advantages of simple partitioning procedure and uniform convergence rate. The Robin-WR method has been extensively studied in the past few years, while the NN-WR method is just proposed very recently and does not get much attention. It was shown in our previous work that the NN-WR method converges much faster than the Robin-WR method, provided the involved parameter, namely β, is chosen properly. In this paper, we perform a convergence analysis of the NN-WR method for time-fractional RC circuits, with special attention to the optimization of the parameter β. For time-fractional PDEs, this work corresponds to the study of the NN-WR method at the semi-discrete level. We present a detailed numerical test of this method, with respect to convergence rate, CPU time and asymptotic dependence on the problem/discretization parameters, in the case of two- and multi-subcircuits. 相似文献
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Y. Song 《Computing》1993,50(4):337-352
In this paper we investigate waveform relaxation (WR) methods for solving initial value problems of linearODE systems. Some sufficient conditions for convergence are proposed. A class ofWR AOR, WR SOR, andWR JOR methods is defined and their convergence is discussed. The asymptotic rates of convergence of two differentWR methods are compared. 相似文献
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Quantification of pavement crack data is one of the most important criteria in determining optimum pavement maintenance strategies. Recently, multi-resolution analysis such as wavelet decompositions provides very good multi-resolution analytical tools for different scales of pavement analysis and distresses classification. This paper present an automatic diagnosis system for detecting and classification pavement crack distress based on Wavelet–Radon Transform (WR) and Dynamic Neural Network (DNN) threshold selection. The algorithm of the proposed system consists of a combination of feature extraction using WR and classification using the neural network technique. The proposed WR + DNN system performance is compared with static neural network (SNN). In test stage; proposed method was applied to the pavement images database to evaluate the system performance. The correct classification rate (CCR) of proposed system is over 99%. This research demonstrated that the WR + DNN method can be used efficiently for fast automatic pavement distress detection and classification. The details of the image processing technique and the characteristic of system are also described in this paper. 相似文献
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《国际计算机数学杂志》2012,89(15):3507-3524
In the paper, we show some new convergence conditions on waveform relaxation (WR) for general differential-algebraic equations (DAEs). The main conclusion is that the convergence conditions on index r+1 can be derived from that of index r, in which the corresponding system is composed by ordinary differential equations if r=0. The approach of analysing relaxation process is novel for WR solutions of DAEs. It is also the first time to give the convergence conclusions for general index systems of DAEs in the WR field. 相似文献
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BWR——带缓冲的虫孔路由技术 总被引:6,自引:0,他引:6
MPP互联网中通常使用虫孔路由WR(Wormhole Routing)交换技术来提高网络性能,采用该技术,每个结点所需的通信缓冲小;并且当消息长度远远大于微片长度时,消息的传输延迟时间与传输距离无关。但WR技术也具有容易阻塞和产生刹车问题的缺点。该文在WR技术的基础上,提出了带缓冲的虫孔路由BWR(Buffered Wormhole Routing)交换技术,并对采用BWR技术的k-ary n-mesh的消息平均传输延迟进行理论分析与模型模拟。结果均表明BWR技术可以较好地解决WR技术带来的问题,可以较好地提高网络的性能。 相似文献
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在航天器真空热试验的温度测量中应用最广泛的是热电偶测温系统,温度参考点是热电偶测温系统的重要组成部分,对温度测试数据的准确性和航天器产品的安全有很大影响。为了在热试验开机前对参考点铂电阻与热点偶补偿端匹配关系的正确性进行验证,设计了一种可用于真空热试验的热电偶测温参考点热响应测试系统。该系统由加热器以及控制箱组成,可通过LAN网络与上位控制计算机连接实现热响应远程测试。文章通过对参考点装置的热分析以及热响应测试原理分析,给出了系统的硬件结构以及软件设计方案,并在多项航天器真空热试验中投入使用,提高了航天器真空热试验热电偶测温系统的可靠性。 相似文献
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We report a new parallel iterative algorithm for time-dependent differential equations by combining the known waveform relaxation (WR) technique with the classical parareal algorithm. The parallelism can be simultaneously exploited in both sub-systems by WR and time by parareal. We also provide a sharp estimation on errors for the new algorithm. The iterations of parareal and WR are balanced to optimize the performance of the algorithm. Furthermore, the parallel speedup and efficiency of the new approach are analyzed by comparing with the classical parareal algorithm and the WR technique, respectively. Numerical experiments are carried out to verify the effectiveness of the theoretic work. 相似文献
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为确保瓶盖的密封性,需要对瓶盖进行密封性抽样检测;在分析既往的机械式测试方法的基础上,设计了一种基于实时滤波的瓶盖密封性测试系统,包括系统的软硬件设计,整体综合测试;采用人机操作界面,使用方便,系统可以存储测量数据及测量结果,并能够实时将本次结果通过嵌入式热敏打印机打印出来;实验结果证明,该系统检测瓶盖密封性准确度达100%;目前该设计已经投入应用,通过应用表明该设计方法方便可靠。 相似文献
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程辉 《自动化与仪器仪表》2020,(2):167-170
为了对2×1000 MW火力发电机组飽不良数据进行分析和识别,提出了电机组运行状态预测模型,以超短期电功率为预测对象,从不良数据的角度出发,建立了一个基于支持向量机(SVM)和随机马尔科夫链的数据分析识别模型。首先,基于大系统数据,利用SVM对电机组进行预测,得出误差和特征;然后,基于马尔科夫链原理,建立状态转移概率矩阵,修正SVM模型的结果;最后,对状态预测数据进行分类整理。对于2×1000 MW火力发电机组,实验结果表明,所提方法可以较准确地分析识别不良数据,准确率达到92%,为2×1000 MW火力发电机组提供良好的纠错环境。 相似文献