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已有的高速无刷直流电机驱动电源与控制电源使用同一供电装置,以使其在实现功能的同时减少控制系统的体积,实现小型化。但实验中发现,统一供电存在电源信号串扰问题。针对此问题,本文设计了一种高速无刷直流电机分立电源控制系统,首先对电机驱动电源与控制电源进行了分立设计,之后对信号处理系统、信号分配系统和电源保护系统进行了改进设计。使用改进前后的电源控制系统进行了对比实验,结果表明,采用分立电源控制系统后,控制电源可在0~12 V精细控制,驱动电源可在0~100 V之间宽幅输出。改进后控制电源与驱动电源未出现串扰问题,即控制电路不会出现过载,驱动电路不会出现欠载。以上结果表明,电机驱动电源与控制电源的分立设计实现了控制信号的精细化调节,提高了其在运行过程中电信号检测的准确性。 相似文献
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自然循环铅冷快堆与超临界二氧化碳(S-CO2)布雷顿循环耦合发电系统是未来先进核能系统的发展方向。基于Apros软件搭建了该耦合发电系统的动态模型,并设计了2种反应堆控制方案,一种为参考压水堆堆芯功率控制系统的常规控制方案,另一种为添加控制棒棒位限制的补偿控制方案。研究结果表明,在3%FP/min(FP为满功率)的小变负荷速率下,2种控制方案下的负荷跟随动态偏差皆在-2%~1%之间,但对于堆芯出口冷却剂温度的稳定,补偿控制方案优于常规控制方案;在6%FP/min~18%FP/min的大变负荷速率下,常规控制方案下的堆芯出口温度变化幅度为-40~0℃,而补偿控制方案下的堆芯出口温度的变化幅度为-5~2℃。因此,补偿控制方案可作为自然循环铅冷快堆控制的有效手段。 相似文献
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该工作采用国际上先进的测量传递星传方式,按照ISO推荐的方法对我们实验室的共型电离室放射性活度测量标准装置的测量过程进行控制,选择标准装置的镭系列参考源中最常用的一枚作为核查标准,两安瓿瓶241Am标准溶液作为传递标准实施性能测试和质量控制。处理了1990年建立计量标准以来的大量数据,建立了初始参数,1996年实施该计量标准装置的性能测试和质量控制,结果表明,标准装置的测量过程一直处于受控状态.该工作的意义是,在具体的标准装置上率先实施国际上先进的质量控制方案,为核实验室日后的计量检定和质量控制奠定了基础。方案本身也适用于其它类计量标准器具与现场仪器的质量控制. 相似文献
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HTR-10燃料元件装卸系统的集散控制 总被引:1,自引:1,他引:0
依据10MW高温气冷实验堆(HTR-10)燃料元件装卸系统的控制要求,对燃料元件装卸系统的集散控制进行了研究,设计了集散控制系统,包括硬件设计,软件设计,步进电动机精确定位闭环控制和无位置传感器转子位置检测的设计,并进行了模拟实验,实验表明,系统的性能稳定可靠,达到了控制要求。 相似文献
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分析了核电工程中各设定工程大型节点(如穹顶吊装提前)的可行眭,针对节点的变更,各施工承包商及参建单位围绕节点目标须采取适当措施,如做好人因管理,控制好施工节奏。以做好过程控制、充分发挥监理的管理职能等措施为质量保证措施,并对后续施工的各类困难进行了分析,制订相应的预防措施,从施工控制、进度控制、安全控制等方面进行了综合分析评估,评估的结果及分析的方法可对各核电建设工程提供丰富的借鉴作用。 相似文献
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本工作在以前课题组关于束晕一混沌控制的基础上,进一步研究了强流加速器中调谐衰减因子和真空相移的改变对束晕-混沌控制的影响及束晕-混沌控制对粒子横向运动的影响,并提出了一种新的控制方法——自适应控制方法,实现了对束晕-混沌的较好控制。本文主要介绍以下3方面的工作。 相似文献
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利用数字FIR滤波器和正比于系统变量的脉冲反馈法的级联控制非线性连续系统中的混沌和超混沌。以实数Lorenz系统和复数洛仑兹-哈肯系统为例进行了数值研究。结果表明:FRI-PPSV级联控制法比仅用FIR滤波法或PPSV法更能有效地控制非线性连续系统中的混沌和超混沌,且抗噪性能PPSV法有显著提高。 相似文献
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分析了已有的各种核辐射剂量场测量方法的基础上, 利用闪烁体吸收发光特点并结合计算机实时成像处理技术,提出了对剂量场分布进行实时成像测量的新方法——阵列式吸收发光CT 法。研制出闪烁光纤阵列构成的探测器及其伺服控制系统, 用高灵敏度的电荷耦合器件(CCD)拾取探测器产生的微弱闪烁光信号,并采用定点采集的方法对视频信号进行数据的快速采集。在图像重建方法上, 提出了迭代滤波反投影重建方法和利用非完全投影进行数据修复,对获取的投影数据进行变换和处理,并通过选择滤波函数及其适当的参数, 可获得最佳滤波效果,以重建剂量场的二维场分布,从而建立了剂量场的实时、高精度的成像测量系统。 相似文献
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Modeling an atmospheric dispersion of a radioactive plume plays an influential role in assessing the environmental impacts caused by nuclear accidents. The performance of data assimilation techniques combined with Gaussian model outputs and measurements to improve forecasting abilities are investigated in this study. Tracer dispersion experiments are performed to produce field data by assuming a radiological emergency. Adaptive neuro-fuzzy inference system (ANFIS) and linear regression filter are considered to assimilate the Gaussian model outputs with measurements. ANFIS is trained so that the model outputs are likely to be more accurate for the experimental data. Linear regression filter is designed to assimilate measurements similar to the ANFIS. It is confirmed that ANFIS could be an appropriate method for an improvement of the forecasting capability of an atmospheric dispersion model in the case of a radiological emergency, judging from the higher correlation coefficients between the measured and the assimilated ones rather than a linear regression filter. This kind of data assimilation method could support a decision-making system when deciding on the best available countermeasures for public health from among emergency preparedness alternatives. 相似文献
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H. Tanaka Y. Sakurai S. Masunaga G. Kashino T. Mitsumoto H. Tsutsui K. Ono 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2009,267(11):1970-1977
At Kyoto University Research Reactor Institute (KURRI), 275 clinical trials of boron neutron capture therapy (BNCT) have been performed as of March 2006, and the effectiveness of BNCT has been revealed. In order to further develop BNCT, it is desirable to supply accelerator-based epithermal-neutron sources that can be installed near the hospital. We proposed the method of filtering and moderating fast neutrons, which are emitted from the reaction between a beryllium target and 30-MeV protons accelerated by a cyclotron accelerator, using an optimum moderator system composed of iron, lead, aluminum and calcium fluoride. At present, an epithermal-neutron source is under construction from June 2008. This system consists of a cyclotron accelerator, beam transport system, neutron-yielding target, filter, moderator and irradiation bed.In this article, an overview of this system and the properties of the treatment neutron beam optimized by the MCNPX Monte Carlo neutron transport code are presented. The distribution of biological effect weighted dose in a head phantom compared with that of Kyoto University Research Reactor (KUR) is shown. It is confirmed that for the accelerator, the biological effect weighted dose for a deeply situated tumor in the phantom is 18% larger than that for KUR, when the limit dose of the normal brain is 10 Gy-eq. The therapeutic time of the cyclotron-based neutron sources are nearly one-quarter of that of KUR. The cyclotron-based epithermal-neutron source is a promising alternative to reactor-based neutron sources for treatments by BNCT. 相似文献
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针对地震数据采集系统提出一种低成本、高灵活性的数字滤波设计方案。不仅对于地震数据采集系统有很大的实用意义,对于其它传感器网络也是可供参考的解决方案。设计的目的是在保持优秀的低通性能的同时实现高度抽取。该滤波器系统由四级CIC滤波和两级FIR滤波构成,分别在FP-GA和MCU内部实现。滤波器有着良好的低通性能,在430 Hz~500 Hz范围内幅度响应下降了137 dB。采用实际信号测试,信噪比好于110 dB,能够很好地满足地震数据采集的需求。 相似文献
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The objective of the present work is to select the material and thickness of an electron-beam converter and filter and a bremsstrahlung
collimator for designing the extraction facilities of an accelerator in an experimental setup for studying the photonuclear
method. Numerical modeling of the conversion of electrons into bremsstrahlung in the electron-beam converter and filter and
passage of the bremsstrahlung in the collimator is performed. The following main criteria are optimized: the neutron yield
from the fissile material under bremsstrahlung, the radiation loads on the content of the irradiated container, and the radiation
background. The data obtained are used to design and build the target block at the exit of the electron accelerator, including
the beam converter and filter, and the bremsstrahlung collimator for an experimental model of a fissile-material detection
facility based on the U-28 accelerator.
Translated from Atomnaya énergiya, Vol. 106, No. 3, pp. 162–167, March, 2009. 相似文献
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反应堆功率保成本控制器设计 总被引:2,自引:0,他引:2
针对反应堆功率控制系统设计中存在的建模误差以及实际运行过程中参数的不确定性,提出了一种新的功率保成本鲁棒控制器设计方法:运用线性矩阵不等式先求解出最优状态反馈保成本控制器,构造卡尔曼滤波器解决实际问题中状态不可测的问题,采用回路恢复的方法使总系统逼近目标反馈环传递函数.系统仿真结果表明,所设计的控制器实现了对设定功率的精确跟踪,解决了在堆模型不确定性、运行过程中参数不确定性下控制系统可能出现的不稳定和控制精度不够的问题,系统不但具有良好的鲁棒性,而且调节性能较好,满足堆功率调节控制的要求. 相似文献
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ZHANG Ruan-Yu LUO Xiao-Bing LI Tai-Hua 《核技术(英文版)》2006,17(4):232-236
The front-end conditioner is an essential part of digital systems of nuclear spectrometer, which functions in two ways: (1) prevents saturation of the subsequent ADC; (2) limits the bandwidth of frequency to realize anti-aliasing. To realize the above-mentioned functions, an optimum front-end conditioner for a resistive feedback charge-sensitive preamplifier is designed. In the conditioner, the pole-zero compensation (P/Z compensation) technique was used to effectively filter signals from the preamplifier. The Butterworth filter was improved after the pole-zero position was optimally set up to shape the wave of output, which tallied with the whole system. The front-end conditioner can resolve the aberration of waveform of nuclear signals in a regular Butterworth filter. Compared with the traditional triple-pole filtering circuitry, the circuitry of this conditioner is more compact and flexible. Moreover, its output waveform is more symmetrical and the signal-to-noise ratio (SNR) is higher. The improvement in the resolution of spectrometer is also significant. 相似文献