仪用高准确度二级串联闭环稳压气源的研究

发布时间：2018-05-08 00:28

本文选题：稳压气源 + 二级串联　；参考：《中国计量学院》2013年硕士论文

【摘要】：随着高精度气动仪器设备的增加，对气源压力稳定性提出了更高的要求。针对目前市场上缺少稳定压力气源的问题，本文提出二级串联闭环反馈的气压控制方法，主要研究工作如下：（1）将二级串联闭环反馈控制方法引入稳压气源伺服系统，进行系统结构设计。针对其中单一密闭气腔建立充放气数学模型，，利用逐步逼近法进行计算机仿真，分析气源压力、气源温度和气腔容积三个参数对单一密闭气腔充放气时间的影响，通过实验验证了仿真的正确性。（2）选择合适的设备和部件，搭建二级串联闭环稳压气源的硬件实验平台，基于LabView软件平台编写相应的控制程序，完成数据采集、PID自动控制、参数设置和手动控制充放气四个子功能模块的编写，该软件同时具有保存测量数据和实时显示控制波形图的功能。（3）通过一系列实验研究供气压力、PID目标气压值和目标值与初始值的差值分别不同的情况下系统的响应特性，并在系统末端有流量的情况下测试系统的气压稳定能力。实验结果表明，前后两个气罐的压力值差值保持在0.2MPa以上时，系统具有良好的调节能力；不同气罐压力、PID目标气压值和目标值与初始值差值对系统特性有不同的影响；系统末端流量达15L/min时，其稳定误差始终保持在2%以内，说明该稳压系统具有较好的气压稳定效果。论文研究结果为高准确度气压伺服控制技术提供了一定的基础，为减小气体流动时气压的波动进行了有益的探索。
[Abstract]:With the increase of high-precision pneumatic instruments, the pressure stability of gas source is required. In view of the lack of stable pressure and gas source in the market at present, this paper presents a two-stage series closed-loop feedback pressure control method. The main research work is as follows: 1) introduce the two-stage series closed-loop feedback control method into the steady-pressure gas source servo system and design the system structure. The mathematical model of gas filling and discharging was established for a single airtight gas chamber. The effect of three parameters, gas source pressure, air source temperature and volume of gas chamber, on the filling and discharging time of a single airtight gas chamber was analyzed by computer simulation using the stepwise approximation method. The correctness of the simulation is verified by experiments. 2) selecting the appropriate equipment and components, setting up the hardware experimental platform of the two-stage series closed loop steady pressure gas source, compiling the corresponding control program based on the LabView software platform, completing the data acquisition pid automatic control, The four sub-function modules of parameter setting and manual control of gas filling and discharging are compiled. The software has the function of saving the measurement data and displaying the control waveform in real time. 3) through a series of experiments, the response characteristics of the system under the condition of the difference between the target pressure value and the target value and the initial value of the gas supply pressure are studied respectively, and the pressure stability of the system is tested under the condition of the flow rate at the end of the system. The experimental results show that the system has good regulating ability when the difference of pressure value between the two cylinders is above 0.2MPa, and the difference between the target pressure value and target value and initial value has different influence on the system characteristics. When the end flow rate of the system reaches 15L/min, the stability error is kept within 2%, which indicates that the system has good pressure stabilization effect. The results of this paper provide a basis for high accuracy pneumatic servo control technology and a useful exploration to reduce the fluctuation of gas pressure during gas flow.
【学位授予单位】：中国计量学院
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TH138.2

【参考文献】