串级系统

Aiming at the high-speed matching controlling problems between adaptive filters inplemented by FPGA and the high-speed AD converters, a high-speed sampling and adaptive filtering system was designedusing asynchronous FIFO. The dual channels AD converter AD9238-40 was used as input stage, two asynchronous FIFOs on-chip were used as high-speed buffer memory, and the sampling and adaptive filtering was controlled by FPGA. The asynchronous FIFO was customized and simulated on Quartus II, the sampling and adaptive filtering controller was designed and also simulated on Quartus II. The high-speed matching controlling of the dual channels AD converter AD9238-40 and the adaptive filter was implemented.

针对用FPGA实现的高速自适应滤波器与高速ADC数据处理速度不匹配、容易产生串扰等问题，提出了一种基于异步FIFO技术的高速采样自适应滤波系统方案，选用双通道高速AD9238-40作为前置输入级，用片内异步FIFO作高速缓存，用FPGA控制采样与滤波，给出了系统的结构框图，对异步FIFO与采样滤波控制器进行了仿真，并将异步FIFO与采样滤波控制器集成在同一FPGA上，完成了对双通道高速AD9238与自适应滤波器的高速匹配控制。

Simulation model （subtopic 3.2）, and the real-time implementation of simulation （subtopic 3.3）; in subtopic 3.2, we point out that our simulation model should select Adams Prediction-Correction integration method for handling the complexity of AUV model and that the step length of integration should be 10 ms ; to sum up, our simulation system, using a high-performance industrial control computer, can real-timely simulate dynamics of underwater vehicle and its sensors and executors by using multi-function data acquisition card and serial ports.

该半实物仿真系统由实时仿真计算机和真实的导航控制计算机构成，实时仿真计算机完成AUV空间运动的实时积分解算，并利用多功能数据采集卡和串行通讯端口模拟AUV导航控制系统中的传感器和操舵机构的工作，为导航控制计算机提供全真的软硬件工作环境，使开发人员在此基础上能够完成导航控制软件全部功能的开发，并进行全面、有效的系统级软件测试，具有非常高的工程实用价值。

A new concatenated code structure is proposed which concatenates a space-time block codes with non binary low density parity check codes, which is high-level modulated without any parallel-to-serial conversion to lower the error and simplify the system structure.

提出了一种新的级联码结构，将基于有限扩域的非二进制LDPC码和空时码级联，这种结构使得非二进制LDPC码不需要串并变换直接进行高阶调制，简化了系统结构，克服了串并变换所带来的误差。

In Chapter 2,encoder structure,decoder structure and interleaver of parallel concatenated Convolutional code and serially concatenated Convolutional code are studied. Symbol-wise SISO algorithm and bit-wise SISO algorithm are given.

在第二章中，系统分析了并行级联卷积编码和串行级联卷积编码的编码结构、交织器的类型、译码结构以及基于符号和基于比特的SISO算法。

The system adopts CPU board with fast processing elevator operational program, data signal exchange, and HMI screen, which can make sure reliable operation and high speed. It also has PHILIPS SJA1000T field CAN bus, 82C251 Bus interface and the latest serial storage technique to record data. The functions of external watchdog and control chip internal watchdog compose two-level procedure monitoring, so as to ensure the normal operation of the control program. Heavy-current switch power LM2576 ensures the stable system working power, which has low requirements for the power supply. High-speed optoelectronic isolator and internal frequency division technology can make NW3P08-41C (42C) CPU receive the input impulse up to 1-phase 100 KHZ*2 CHANEL or 2-phase 50KHZ*1 CHANEL 32bit.

系统采用原装中央处理板，具有快速的处理电梯运行程序、数据信号交换、显示屏人机界面；确保可靠运行电梯控制程序；且速度快，PHILIPS 公司 SJA1000T 现场 CAN 总线；以及 82C251BUS 接口，最新串行存贮技术记录数据；外部看门狗及控制芯片内部看门狗功能组成两级程序监视，确保控制程序正常运行；大电流开关电源 LM2576 确保系统工作电源稳定，且对供电电源要求低；高速光电隔离光藕及微机内部分频技术，使 NW3P08-41C(42C)中央处理板可接收高达 1 相 100KHZ*2通道或 2 相 50KHZ*1通道，32bit 的计数脉冲。

This system of another a characteristics is, the manifestation electric circuit is an serial static appearance show electric circuit, application moving first deposit the machine a can realize string- and, using 8 figures for receiving single-chip-machine sending outs tube manifestation type matrix, this provided the more friendly man-machine interface for the customer, the convenience proceed to the measured value observational, adopt the homologous operation.

本系统的另外一个特点是，显示电路是一个串行接口的串行静态显示电路，应用移位寄存器74LS164能够实现串-并的特点，用8个级联的74LS164来接收单片机发出的数码管显示字模，这为用户提供了更为友好的人机界面，方便对测量值进行观察，采取相应的操作。

This system of another a characteristics is, the manifestation electric circuit is an serial static appearance show electric circuit, application moving first deposit the machine a can realize string- and, using 8 figures for receiving single-chip-machine sending outs tube manifestation type matrix, this provided the more friendly man-machine interface for the customer, the convenience proceed to the measured value observational, adopt the homologous operation.

本系统的另外一个特点是，显示电路是一个串行接口的串行静态显示电路，应用移位寄存器74LS164能够实现串-并的特点，用8个级联的74LS164来接收单片机发出的数码管显示字模，这为用户提供了更为友好的人机界面，方便对测量值进行观察，采取相应的操作。对于系统单片机的配置，我选用了被动串行模式。这是因为FPGA作为从属器件，主要是由单片机提供配置所需的时序，实现配置数据的下载。

Then the technological flow and problems of the drying section which need to solve are discussed in detail. According to the design rules and development process of computer control system, a set of control system for the drying section of shaft furnace pellet plant is designed.

首先在对烘干过程进行机理分析与辨识的基础上进行控制算法设计，系统整体采用串级控制方案，内环温度环采用基于遗传算法参数整定的PID 控制，外环水分环采用模糊控制。

The concise control scheme and particular control algorithms employed are illustrated in detail, which mainly include pressure piecewise control for heat pump group and the low-point selection control for heat pump actuator, the pressure piecewise control for low-temperature dryer of Wet paper sheet, the pressure split control for the secondary steam recovery of oven and the cascade control for paper sheet moisture.

简要介绍纸幅干燥原理和热泵节能机理，设计一套基于S7-300 PLC的五叠网涂布白板纸机蒸汽冷凝水热力控制系统，阐述具体的控制方案和采用的控制算法，其中主要包括热泵组的压力分段控制和热泵开度的低端选择控制、湿端低温段烘缸组压力回路分段控制、热烘箱二次蒸汽回收压力回路的分程控制和成纸水分的串级控制。

The thesis introduces development of control system of distillation and vacuum unit of TPCC Refinery.

本文介绍了天津石化炼油厂常减压装置的控制系统的发展过程，研究了串级控制在二套常减压装置减压塔上的应用。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。