| 1. | Selective difference frequency adverbs
频率副词的选择性差异 |
| 2. | Difference frequency distortion
差频失真 |
| 3. | Photographic sound record ; difference frequency method for measurement of non - linear distortions
摄影录音.测量非线性失真的差频法 |
| 4. | Then through the ddm , the method of lines ( mol ) combined with the finite - difference frequency - domain ( fdfd ) method is used for the parameter extraction of multilayered multiconductor interconnections
然后利用区域分解法平台，将直线法和有限差分结合起来，用于提取多层介质中具有任意截面形状多导体互连结构的电磁参数。 |
| 5. | ( 2 ) hardware design of difference frequency capacitance measurement circuit , including the structure of sensor , analysis on several relative measurement circuits , periphery circus design . debugs and practically measures it
( 2 )进行了差频式电容测量电路的硬件设计，主要包括：传感器结构设计，各种微小电容检测电路的对比分析，差频式检测电路设计，温度检测电路设计以及存储电路设计。 |
| 6. | ( 4 ) preparation of sample of grain moisture measurement , design and implement of project , analysis of data which affect moisture measurement . the relationship of moisture , difference frequency , temperature and weight is pointed out
( 4 )粮食水分检测样本的制备，数据采集方案的设计及具体实施，最后通过对影响水分检测各因素之间的数据分析，指出了水分与差频、温度、紧实度之间的关系。 |
| 7. | There is difference frequency measurement requirement for every part of pid regulating , difference between dynamic quality and static quality in response time and accuracy . according to these , it use the interrupt functions and high - speed counter of the simens s7 - 200 plc cpu226 basic unit and some peripheral circuit to measure frequency ; in software designed , the procedure frame of hydraulic - turbine governor and disperse process of parallel pid are analyzed , an improved pid algorithm is adopted to realize a pid regulation mode with variable structure and parameters ; the mechanical liquid - pressure system of the hydraulic - turbine governor is with electric - hydraulic converter unit of step motor . according to the drive character of five phase of response step motor , a variable frequency regulated voltage driver unit is designed in order to realize interface between plc and driver of step motor
本文利用s7 - 200plc自身的特点设计了频率测量单元，根据pid调节各个环节的特点，以及调速器动态特性、静态特性对频率测量的实时性和精度要求的不同，利用s7 - 200plc基本单元中内置的高速计数器以及相应的外围放大整形、分频电路，实现了水轮发电机组频率的测量；在软件上，对微机调速器的整个程序框架、并联pid的离散化过程进行了分析，选用改进的pid算法实现了变参数、变结构的pid调节模式；调速器的机械液压随动系统具有步进电机电液转换元件，采用五相反应式步进电机，根据其驱动特性设计了变频调压驱动器，实现plc与步进电机驱动器之间数字接口。 |
| 8. | The concrete design method of the votating speed difference frequency fuzzy controller is studied in detail . based on single - chip microcomputer 8031 , using table look - up method , votating speed difference frequency fuzzy controller applied to induction motors is implemented . simulation result demonstrates that the control result for the producing plastic flat yarn of votating speed difference frequency fuzzy control to the speed of induction motors is idealer
本文对转差频率模糊控制器的具体设计方法进行了讨论：以单片机为核心，用查表法实现异步电动机转差频率模糊控制；最后，结合工厂塑料平膜拉丝机驱动电机参数对系统进行了仿真，分析了转差频率模糊控制对异步电动机转速的控制效果，结果是比较理想的。 |
| 9. | This paper studies and designs a variable frequency speed regulation system applied to induction motors by means of votating speed difference frequency fuzzy control . the general scheme of the system is presented . circuits and software are designed for the major parts of the system such as constant magnetic linkage control frequency converter and votating speed difference frequency fuzzy controller
本文对异步电动机转差频率模糊控制变频调速系统进行了较为详细的研究和设计，给出了系统的总体方案。对于系统的主要组成部分? ?恒磁链控制变频器和转差频率模糊控制器进行了设计。 |
| 10. | In this paper , author goes deep into analysing dielectric property of grain in theory , and brings forward a difference frequency capacitance measurement method based on the analyse of several micro - capacitance measurement methods . at the same time , a mathematics model of moisture measurement is given , which depends on data merging surround moisture , difference frequency , temperature and weight by multi - element regression
在本次毕业设计中，作者对此进行了较为深入、系统的研究，从理论上分析了粮食的介电特性，在对比分析了几种微小电容测量方法的基础上采用了差频式电容测量方法，并采用多元回归分析法对水分、差频、温度、重量四种测量数据进行了数据融合，提出了粮食水分测量的数学模型。 |
