脉冲宽度调制
占空比
磁性流量计
流量控制阀
流量测量
控制阀
控制理论(社会学)
流量控制(数据)
流量(数学)
体积流量
流量系数
质量流量计
热式质量流量计
调制(音乐)
机械
声学
工程类
计算机科学
机械工程
电气工程
物理
电压
电信
人工智能
控制(管理)
作者
Kanchit Pawananont,Thananchai Leephakpreeda
出处
期刊:Journal of Dynamic Systems Measurement and Control-transactions of The Asme
[ASME International]
日期:2018-08-09
卷期号:141 (1)
被引量:9
摘要
Control of on–off valves for linear flow characteristics is a challenging design problem due to nonlinearity of valve mechanism and fluidic properties under various operating conditions. In this study, averaging pulse width modulation (PWM) is proposed as a control valve signal by implementing PWM with predetermined duty period so that overflow at the open position and underflow at the closed position are divided proportionately around desired mean flow rates during entire cycle periods. Multichannels in a parallel pattern are implemented to yield linear flow characteristics with higher resolution than a single channel. With pressure and temperature measurements, the volumetric flow rate is determined by an empirical model of flow characteristics across flow control valves at given operating conditions. The experimental results on achieving the desired volumetric flow rate of air under actual flow conditions without a flow meter are presented for viability of the proposed methodology in practical uses.
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