共查询到18条相似文献,搜索用时 125 毫秒
1.
2.
分析电阻炉温度控制的数学模型,采用Fuzzy-smith预估控制算法进行控制系统设计,给出了电阻炉温控制系统结构图,并进行计算机仿真实验,证明该控制方法的有效性。 相似文献
3.
并联六自由度主动减振平台可有效隔离外界低频微振动对加速器BPM及光束线站等精密设备的影响,由于并联六自由度主动减振平台具有很强的耦合特性,需对平台的耦合特性进行分析研究。本文以压电陶瓷驱动器构建并联六自由度主动减振平台,在平台运动学的基础上,采用Newton-Euler法建立了平台的动力学模型。分析了平台各通道间的耦合特性,设计了一种通用的平台解耦控制策略。搭建了实验验证平台,开展次级通道参数测量与减振实验研究。实验结果表明,设计的多通道解耦控制策略是有效的,平台对低频微振动有良好的减振效果。 相似文献
4.
5.
6.
7.
8.
9.
同步辐射光束线光学元件的振动不稳定性将影响样品处的光斑位置,将粘弹性减振器安装在光学元件上可以减弱地面微振动对机构影响。研究设计了粘弹性减振器,对粘弹性材料的剪切储能模量和损耗模量进行共享参数的非线性拟合,得到Prony级数各项系数;通过有限元软件模拟了粘弹性减振器的动力学性能,并以某长反射镜为例,对安装减振器后的结构系统进行谐响应分析、瞬态动力学分析以及静力学分析,并且比较了减振器安装位置对减振效果的影响。结果表明:粘弹性减振器能有效控制地面微振动对光学元件长反射镜振动稳定性的影响;减振器安装在光学元件底板下靠近两端减振效果更好,能显著提高元件的振动稳定性。该项研究对光束线其他光学元件的振动稳定性研究具有参考意义。 相似文献
10.
SIMPCT仪控系统对象实时仿真系统硬件设备由一台Alpha工作站配备16位精度,快速转换输入/输出接口组成,仿真模型则采用在工程设计中广泛使用的反应堆热工水力系统分析程序,研究开发SIMPCT实时仿真系统的目的是为了给数字化反应堆保护系统和控制系统提供保护和控制的仿真对象,并与控制系统形成能够相互作用的闭环系统,用于保护系统功能测试,控制系统运行及进一步的控制方案研究。 相似文献
11.
LIU Renhong YU Jiebing WANG Guangyuan KANG Ling CHEN Jiaxin ZHANG Junsong LIU Lei HUANG Liangsheng 《原子能科学技术》1959,54(10):1940-1946
A parallel 6-DOF vibration isolation platform was built with piezoelectric ceramic actuators. And the NI Compact-RIO real-time control system and Fx-LMS adaptive filtering control algorithm were used for active vibration control. The secondary channel identification method and active control algorithm were simulated, and the active vibration control system was built for experimental verification. The simulation and experimental results show that the designed active vibration control system has a good control effect on the low-frequency micro-vibration at the range of 7 Hz to 50 Hz. 相似文献
12.
为了能开展高能电子成像相关实验研究,中国科学院近代物理研究所建造了一台S波段的射频电子直线加速器。为保证实验用束流品质和加速器稳定运行的要求,设计了一套低电平控制系统,利用上下变频、IQ解调技术,实现了相位的反馈控制。本文介绍了低电平控制系统的设计及数字化算法的实现,给出了系统闭环实验的测试结果,实现相位控制精度达到±0.5°(峰峰值)和0.110 8°(均方根)。该系统利用成熟的商业化模拟微波器件和相关的PXI板卡实现,基于LabVIEW软件开发了相关的控制程序和界面,具有搭建方便、开发时间短、结构简单紧凑、易于使用和维护的特点。 相似文献
13.
《Fusion Engineering and Design》2014,89(9-10):2357-2362
In the process of assembly and maintenance of ITER vacuum vessel (ITER VV), various machining tasks including threading, milling, welding-defects cutting and flexible hose boring are required to be performed from inside of ITER VV by on-site machining tools. Robot machine is a promising option for these tasks, but great chatter (machine vibration) would happen in the machining process. The chatter vibration will deteriorate the robot accuracy and surface quality, and even cause some damages on the end-effector tools and the robot structure itself. This paper introduces two vibration control methods, one is passive and another is active vibration control. For the passive vibration control, a parallel mechanism is presented to increase the stiffness of robot machine; for the active vibration control, a hybrid control method combining feedforward controller and nonlinear feedback controller is introduced for chatter suppression. A dynamic model and its chatter vibration phenomena of a hybrid robot is demonstrated. Simulation results are given based on the proposed hybrid robot machine which is developed for the ITER VV assembly and maintenance. 相似文献
14.
采用模糊PID控制算法,根据HI-13串列加速器头部电压控制的实际需要设计了PID控制参数模糊化计算方法,实时获得了头部电压PID控制参数,并根据控制参数计算得出实际的头部电压控制量。根据设计的模糊PID控制算法设计了HI-13串列加速器头部电压稳压计算机控制模块,并进行了实验研究。实验结果表明,与普通PID控制方法相比,采用模糊PID控制算法的HI-13串列加速器头部电压控制过程具有控制精度高、更快达到稳态的优点,可改善HI-13串列加速器高压系统的性能。 相似文献
15.
浮动核电站系统典型用泵(典型泵)在系统运行期间振动线谱突出,加大了整个系统的振动水平。本文以典型泵在49 Hz处的振动特征线谱为控制对象,开展动力吸振器的设计研究。结合系统运行环境、吸振器吸振原理、安装方式等多方面因素,初步提出吸振器设计参数,并探讨吸振器几何参数、质量、阻尼对吸振频率的影响;建立典型泵的动力吸振器有限元模型,验证动力吸振器的吸振效果,并分析吸振器质量、阻尼、安装个数对吸振性能的影响。结果表明:动力吸振器满足在8~400 Hz的频率范围内可调,加装动力吸振器后典型泵在49 Hz处的振动线谱控制效果可达到7.3 dB。 相似文献
16.
17.
18.
《Journal of Nuclear Science and Technology》2013,50(12):869-877
Experiments on reactor noise were conducted at KUR. Depending on the operating condition of the reactor, the cause of the noise are classified into the following four types. 1. Zero-power noise source due to the branching process of fission neutrons and/or due to random bombardment of neutrons to the detector—under natural circulation of coolant and at essentially zero-power level. 2. Coolant temperature fluctuation due to natural convection—under natural circulation and at relatively high power level. 3. Flow induced vibration of shim control rods—under forced circulation of coolant and at low power level. 4. Fluctuation of inlet coolant temperature—under forced circulation and near the maximum power level. Vibration of a spare shim control rod and fluctuation of inlet coolant temperature were measured simultaneously with the neutronic noise. Then the noise sources of the types (3) and (4) were verified. The vibration of a control rod has a broad spectrum in low frequency region besides the large peak at 14 Hz. The fluctuation of inlet coolant temperature is non-white noise and consists of large low frequency component. The theoretically predicted sink structures in the neutronic PSD relating to the transit time of inlet coolant temperature fluctuation through the core were not observed in the experimental results. 相似文献