低速风洞微机控制闭环调速

本文提出一种用于调节低速风洞流速的测量及控制系统。该系统以微计算机为核心,不断采集风洞实验段的流速数据,并根据测量结果与指定值的比较去调节和控制风洞的电机转速,使风洞能准确地按指定风速运行或按予定的程序升速或降速,实现了低速风洞的闭环自动调速。本文给出了该系统的构成原理和性能实验结果。测试结果表明,本系统的超调量小于5％,稳态误差小于0.3％,调节时间小于50秒。

A Closed_loop Speed Control System for Low Speed wind Tunnel

A closed-loop speed control system for low speed wind tunnel is proposed. In this system, differential pressure and temperature signals are fed into a microcomputer. The flow velocity at the test section computed there by is compared with the inputted desired velue and a signal is sent to the controlled motor to adjust the flow velocity antomatically. The principle of construction and testing results are given. The amount of over-adjustment is less than 5%, steady-state error is less than 0.3% and the adjusting time is less than 50 seconds.