基于模糊PID控制的智能动态血压仪关键技术研究

发布时间：2018-05-03 06:12

本文选题：夜间动态血压测量 + 改进示波法　；参考：《江西理工大学》2017年硕士论文

【摘要】：心血管疾病是世界上非常普遍的疾病之一,而随着人们越来越关注自身的身体健康状况,人们也越来越迫切需要一款能够准确反映人体血压状况的仪器设备。研究表明,夜间动态血压是评估降压治疗24小时后效果的重要指标。然而目前市面上电子血压仪常采用袖带测量血压,由于采用先升压后再降压的测量方法测量血压,该方法测量时间长,对受测者影响较大,打扰受测者晚间睡眠,不能实现夜间动态血压测量,所以设计一种测量时间少且对受测者影响较小,能够实现夜间动态血压测量的智能动态血压测量仪迫在眉睫。在此背景下,从市场的迫切需求出发,广泛借鉴国内外己有经验成果,深入研究血压测量方法,设计了一款可夜间测量的智能动态血压测量系统。针对传统袖带式示波法不能实现真正的动态测量过程以及不适合夜间测量这两个缺陷,提出了改进示波法测量动态血压。改进示波法测量动态血压的两个关键技术是心率变异性分析算法实现以及定量阶梯式升压过程实现。(1)为实现改进示波法的动态测量过程,必须在心率测量模式下检测人体心率信号,然后通过心率变异性分析和定时器相结合的技术实现动态测量过程。其中心率变异性分析选用Welch算法实现,而为改善算法的分辨率采用组合窗实现加窗处理。心率变异性分析实验结果表明:采用基于组合窗的Welch算法在MSP430平台上得到的结果和标准的MATLAB心率变异性分析程序的结果误差较小,基本实现了心率变异性分析算法,从而基本达到了智能动态血压测量的要求。(2)为实现定量阶梯式升压过程,采用基于模糊PID控制算法来调整加压过程的斜率来实现线性加压过程。并可通过相应的上位机实现控制过程中压力信号的追踪与保存,以便于分析控制误差。定量阶梯式升压实验结果表明:采用模糊PID控制算法实现定量阶梯式升压测量方式取得了较小的控制误差,同时也可以观察到相应的脉搏波信号,说明该血压测量方法是可行的,从而基本达到了夜间血压测量的要求。
[Abstract]:Cardiovascular disease is one of the most common diseases in the world, and as people pay more and more attention to their own health, people are in urgent need of an instrument that can accurately reflect the human blood pressure. The study shows that ambulatory blood pressure at night is an important index to evaluate the effect of antihypertensive therapy 24 hours later. However, at present, the electronic blood pressure meter on the market often uses cuff to measure blood pressure. Because the blood pressure is measured by the method of first rising blood pressure and then lowering blood pressure, this method measures blood pressure for a long time, which has a great influence on the subjects and interrupts the subjects' sleep at night. It is not possible to measure ambulatory blood pressure at night, so it is urgent to design an intelligent ambulatory blood pressure measuring instrument which has less time and less influence on the subjects, and can realize the measurement of ambulatory blood pressure at night. Under this background, proceeding from the urgent demand of market, drawing lessons from the domestic and foreign experience, deeply studying the method of blood pressure measurement, a kind of intelligent ambulatory blood pressure measurement system which can measure blood pressure at night is designed. Aiming at the two defects that the traditional cuff band oscillographic method can not realize the real dynamic measurement process and is not suitable for nocturnal measurement, an improved oscillographic method is proposed to measure ambulatory blood pressure. The two key techniques of improved oscillographic method to measure ambulatory blood pressure are the realization of heart rate variability analysis algorithm and the realization of quantitative stepwise boost process. The human heart rate signal must be detected in the heart rate measurement mode, and then the dynamic measurement process must be realized by the combination of heart rate variability analysis and timer. Welch algorithm is used to analyze heart rate variability, and combination window is used to improve the resolution of the algorithm. The results of heart rate variability analysis show that the results obtained on MSP430 platform by Welch algorithm based on combinatorial window and the result error of standard MATLAB heart rate variability analysis program are small, and the algorithm of heart rate variability analysis is basically realized. Thus, the requirement of intelligent ambulatory blood pressure measurement is basically met. In order to realize the quantitative stepwise boost process, a fuzzy PID control algorithm is adopted to adjust the slope of the pressurization process to realize the linear pressurization process. The tracking and saving of the pressure signal can be realized by the corresponding upper computer, so that the control error can be analyzed easily. The experimental results of quantitative stepwise boost show that the fuzzy PID control algorithm is used to realize the quantitative stepwise boost measurement with small control error, and the corresponding pulse wave signals can be observed. It shows that the method is feasible and meets the requirement of nocturnal blood pressure measurement.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH776;TP273

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