Abstract: The high-frequency unidirectional sinusoidal flow signal can be used in a wide range of applications such as dynamic flow calibration and transient hydrodynamic measurement. A high-frequency unidirectional sinusoidal flow control valve is proposed, its structure and working principle are introduced, the mathematical model of this flow control valve is established, and its model is simulated and studied using Matlab software. Finally, an experimental platform is built to experimentally verify the high-frequency unidirectional sinusoidal flow signal generation performance of this prototype flow control valve. When step signals of different amplitudes are applied, the flow does not overshoot; and the maximum response time was about 0.8 s. When the valve is made to generate a unidirectional sinusoidal flow signal from 5 to 50 Hz, the flow amplitude of the valve output starts to decrease only after 40 Hz, and the sinusoidal flow amplitude decreases by about 8% when the valve reaches the highest sinusoidal flow signal output frequency of the design, 50 Hz. At this point, a step signal is applied to the valve to change the mean value of the resulting sinusoidal flow signal. Its step response to the mean value does not overshoot and does not affect the occurrence of the sinusoidal flow signal amplitude. The experimental results show that the valve can effectively generate a unidirectional sinusoidal flow with a maximum magnitude of 25 L/min, a frequency of 40 Hz; and an adjustable mean flow range of 0～10 L/min.

Key words: high-frequency flow signals, unidirectional sinusoidal flow, flow control valve, transfer function, experimental research