单向高频正弦流量信号标定系统的建模与试验

Modeling and testing of unidirectional high-frequency sinusoidal flow signal calibration system

为了标定单向动态流量信号,提出单向高频流量信号标定系统.该系统用动态缸活塞运动速度记录流量的动态变化,用流量计记录流量的稳态值.建立系统的数学模型和AMESim仿真模型,评估所提系统的动态标定性能.仿真结果显示,在输入正弦流量信号和阶跃流量信号后,标定系统经调整后会达到稳定状态,即动态缸活塞处于设定的行程中位。在输入50 Hz的正弦流量信号后系统仍未出现幅值衰减,具有良好的标定能力.搭建试验台,输入单向高频正弦流量信号进行标定系统试验,使用标定流量理论公式计算系统的输出值.试验结果证明,当输入变频率为5~30 Hz的正弦流量信号时,标定系统的输出值没有幅值衰减和相位滞后.系统的表现与仿真结论一致,具有标定单向高频流量信号的可行性.

In order to calibrate the unidirectional dynamic flow signal,a unidirectional high-frequency flow signal calibration system was proposed to record the dynamic change of the flow rate with the dynamic cylinder piston movement speed and to record the steady state value of the flow rate with the flow meter.A mathematical model of the system and an AMESim simulation model were built to evaluate the dynamic calibration performance of the proposed system.The simulation results show that after input of the sinusoidal flow signal and step flow signal,the calibration system will reach a stable state after adjustment,that is,the dynamic cylinder piston is in the set stroke position.After the input of a 50 Hz sinusoidal flow signal,the system still does not appear amplitude attenuation,which has good calibration ability.A test bench was set up to input the unidirectional high-frequency sinusoidal flow signal for a calibration test,and the output value of the system was calculated using the theoretical formula for calibration flow.The test results prove that there is no amplitude decay and phase lag in the output value of the calibration system when the sinusoidal flow signal with an input frequency range of 5-30 Hz is input.The performance of the system is consistent with the simulation conclusions and has the feasibility of calibrating unidirectional high-frequency flow signals.