步测

In order to overcome the statistic of step sizes in the inertial system, we have designed an inchworm system by electromagnetic clamping. A displacement speed of 30μm/s has been attained, and its step sizes is uniform.

为了克服惯性移动方式所出现的步长随机性的问题，我们又进一步研制了电磁吸引式的步进驱动系统，实际测得其移动速率约为30μm/s。

The thesis contains five chapters. The first chapter summarizes the development and research of switched reluctance drive, discusses the main research direction, and explains the main work in this paper. In chapter 2, hardware system which includes the design of power converter and various control circuit is discussed. TMS320LF2407 DSP is used to design the hardware circuits of SRM control system, and design details including the current detection, position sensing, fault protection, speed detecting, keyboard and display etc. are provided. Because of the full use of the abundant peripheral resources of DSP, it comes to the aim simplifying the circuit structure and heightening the reliability. In chapter 3, the application of neural network on SRM control system is introduced, a new the application of neural network and the method of sampling is proposed and a simulation system based on Matlab/Simulink is established. Chapter 4 discusses the routine designing issue. Because the modularized programming method is adopted, and multi-interrupt processing technique is used, operation efficiency of the control software is highly raised. At last, the foregoing SRM control system is tested. Speed adjustment is realized, and other targets on the research and design of SRM control system are reached, which establishes a good foundation for further research.

本文共分五章，第一章概述了开关磁阻电机调速系统(Switched Reluctance Drive，简称SRD)及其发展和研究现状，论述了其主要研究方向，并说明了本文的主要工作；接下来的一章主要讨论了SRM的硬件系统，主要包括功率变换器的设计和各种控制电路的设计，本文以TMS320LF2407为核心设计了开关磁阻电机控制系统硬件电路，给出了包括电流检测、位置检测、故障保护、测速电路及键盘和显示电路等部分电路的详细设计，充分利用了DSP的丰富外设资源，达到了简化电路结构、提高运行可靠性的目的；第三章介绍了人工神经网络在开关磁阻电机控制系统中的应用，提出了一种新的应用方式(利用GPFN神经网络调节PI参数)以及如何采取样本，搭建了基于Matlab/Simulink的仿真系统；在第四章中，讨论了开关磁阻电机控制软件的设计，采用模块化编程方法，采用基于多中断的控制程序，提高了控制软件的效率；最后，对所设计的开关磁阻电机控制系统进行了实验，实现了电机调速，达到了开关磁阻电机控制系统研究和设计的预期目标，为更近一步研究打下了基础。

The circuit of range finder is expounded in systemic hardware. The operation control and the selection of stepper motors, the flow chart of main programme , the circuit of meterage of temperature and display etc are primarily designed.

系统的硬件部分，对测距电路做了简单的设计与分析；对步进电机的选定及其运行控制、测温电路及其程序、显示电路做了初步的设计；介绍了控制芯片AT89C51及对主程序流程图做了简单的设计等。

Mitochondrial DNA extraction, long-PCR amplification and primer-walking sequencing methods were carried out for determining the complete mt DNA sequence of Scolopendra multilan.(1) The complete mitochondrial genome of Scolopendra multilan is 13,734 bp in size.

采用长片断扩增和PCR引物步移测序等方法，补齐少棘蜈蚣线粒体基因组全序列，主要结果如下：（1）序列全长为13，734 bp，其基因组成和顺序、基因的方向即编码链的选择、碱基G的低含量和对碱基A偏好以及GC和AT偏斜与已知的多足动物线粒体基因组相同。

With the completion of human genome sequencing, the next challenge is to understand the function of each gene.

随着人类基因组大规模测序的完成，下一步的挑战是了解每一个基因的功能。

This system has achieved the new-type spectrophotometer platform's control requirement on high-speed and high precision of stepping motor.

该系统达到了新型分光测色平台对步进电机高速高精度的控制要求。

We observed that the genomic data for the four fig species were more divergent than for stone oak species, possibly due to their complex pollination syndrome and high rates of gene flow. Our approach greatly enhances the application of SRS technology to the study of non-model organisms and directly identifies the most informative genetic elements for more detailed study and assembly.

新一代 DNA 测序技术的突破为研究热带森林的生态和进化提供了一个新的平台， Cannon 教授等的研究是版纳植物园为把基因组学应用在植物功能适应进化与气候变化、物种多样化和共存、以及极度濒危的亚洲热带森林自然资源保护诸方面所迈出的重要一步。

In the part of the vibration experiments and analysis, firstly, used the simple-beam theory to estimate the natural frequency of the beam of the 20-headed computerized embroidery machine.secondly, measured the beam of its low rank natural frequency, the beams horizontal vibrating acceleration amplitude, speed amplitude and the displacement amplitude in different rev and different turn parts. Found that it is sympathetic vibration, which bring on the thread-broken rate rise rapidly. On this base, established the finite element analysis modle of the vibrating beam, and took on hamonic analysis and modal analysis with the mold. The rusult of test and analysis offer the basis for farther improvement of the computerized embroidery machine.

振动分析部分，首先由简单梁理论出发，对横梁的固有频率进行估算；接着通过测振仪器对20头电脑刺绣机横梁进行了试验模态分析和不同工况振动测试；获得了横梁前四阶固有频率和模态振型，以及在不同工作转速、不同回转部件下横梁振动的加速度幅值、速度幅值和位移幅值；找到了横梁振动加剧的原因——共振；在此基础上建立了符合实际情况的横梁有限元模型，对模型进行了模态和谐响应计算，证实了模型的可靠性，为下一步的改进设计提供了依据。

The balance regulation of the system us the digital PID control algorithm, using experiment to install PID parameter. Through the changed angle measured by angle sensor the stepper motor is controlled to make the teeterboard achieve balanceable state.

系统的平衡调节采用了数字PID控制算法，利用凑试法整定PID参数，通过角度传感器所测角度变化来控制步进电机的的转动实现跷跷板达到平衡状态。

The discussion of hardware design of the unit are focused on the three respects: the measurement and the control of warp tension, the driving of the warp beam.

本文综述了前人在织机送经研究领域的成果，讨论了新型织机理想送经机构的特性和电动送经装置的模式，提出了用步进电机作为送经电机、单片微机作为控制器的新型电动送经装置方案，从经纱张力感测、控制和织轴驱动三个方面论述了该电动送经装置的硬件设计方案。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。