【作者】 李智；

【导师】 郭万有；

【作者基本信息】 西安电子科技大学 ， 电路与系统， 2021， 硕士

【摘要】 活塞型压力测量系统基于帕斯卡定律,采用电子测量技术和自动控制技术实现压力测量。论文研究基于DSP的活塞型压力测量系统的设计方法,结合对压力测控方法和处理算法的分析,完成测量、处理和控制部分硬件和软件的设计,以提高测量结果的精确度和测量过程的智能化程度。论文首先对活塞型压力测量系统中用到的电子测量、自动控制和数据处理方面的相关技术进行研究。从压力测量、温度测量、位置测量和电机控制四个方面出发,研究了其测量原理及控制算法,并对相应算法进行仿真。对于压力测量,论文研究了多种压力传感器的工作原理,并针对其共同存在的温度漂移和非线性误差,设计了基于插值算法的误差补偿算法;对于温度测量,论文研究了多种温度传感器的工作原理,并针对其测量过程中测量值稳定性差的问题,设计了基于卡尔曼滤波的误差补偿算法;对于位置测量,论文创新性地将图像滤波、二值化、边缘检测等数字图像处理相关理论应用于压力测量系统中,设计了基于数字图像处理的位置测量算法;对于电机控制,为了实现精准快速的控制,论文采用了基于PSO算法整定PID参数进而控制步进电机的方法。在对活塞型压力测量系统中测量、控制和处理技术深入研究的基础上,论文进行了活塞型压力测量系统的软硬件设计。系统的硬件组成包括DSP主控、参数测量、电机控制和人机交互等电路。主控电路部分主要进行了DSP的选型,介绍了ADSP BF609的特性,基于BF609设计了电源、时钟和复位等外围电路。随后设计了压力测量、温度测量和图像采集电路,并采用THB6064芯片设计了步进电机的驱动电路,最后设计了LCD人机交互模块电路。之后论文给出系统软件部分设计总体方案,确定系统的工作流程,并对系统初始化、测量部分算法移植、电机控制算法移植和人机交互界面给出了设计流程。在系统验证方面,搭建了系统测试平台,确定了系统测试方案,通过先模块后整体的思路,验证了论文设计的活塞型压力测量系统在测量、控制和算法处理方面的正确性和准确性。更多还原

【Abstract】 Based on Pascal’s law,the piston pressure measuring system adopts electronic measuring technology and automatic control technology to realize the pressure measurement.Through the research and analysis of pressure measurement control methods and processing algorithms,the paper completed the design of hardware and software for the measurement,processing and control of the system,so that the measuring results are more accurate and stable,and the measuring procedure is more intelligent.Firstly,the paper studies the related theories of system measurement,control and treatment,and applies these techniques to the piston pressure measurement system.The paper studies the principles of pressure measurement,temperature measurement,position measurement and motor control in the piston pressure measurement system,and then designs and simulates the corresponding algorithm.Based on the simulation results,the correctness and applicability of the algorithm for the system are verified.In the aspect of pressure measurement,this paper firstly studies the working principle of the pressure sensor.Aiming at the temperature drift and nonlinear error existing in the sensor measurement process,this paper designs the measurement error compensation algorithm based on the interpolation algorithm.In terms of temperature measurement,by studying the working principle of temperature sensor,error compensation algorithm is designed based on Kalman filter algorithm to solve the problem of unstable sensor measurement results.In terms of position measurement,based on the theory of image filtering,binarization,edge detection,this paper innovatively designs a position measurement algorithm using digital image processing technology.For motor control,the paper adopts PSO algorithm to set the parameters of PID controller.Based on the research of measurement,control and processing technology of the system,the paper designs the hardware and software of the piston pressure measuring system.The hardware of the system includes four parts: DSP main control circuit,parameter measurement circuit,motor control circuit and human-computer interaction circuit.The main control circuit part mainly introduces the choice of DSP,introduces the characteristics of ADSP BF609,based on BF609 design of power supply,clock and reset and other peripheral circuits.Then,the circuit of pressure measurement,temperature measurement and image acquisition is designed.The driving circuit of stepping motor is designed using THB6064 chip.Finally,the circuit design of LCD man-machine interaction interface is finished.After that,we develop the overall software design scheme,confirm the work flow of the system and design flow of system initialization,the algorithm transplantation of the measurement part,the motor control algorithm transplantation and the human-computer interaction interface.As for system verification,the paper set up a system test platform and propose a test scheme.We first design each module one by one,and then assemble them together.Simulation results validate the accuracy on measurement,control and algorithm processing of the piston pressure measurement system in this paper.更多还原