CAJ | 학술논문

在PWM 间歇喷雾式变量喷施系统中，隔膜泵间歇性吸排液等特点会在管路中形成压力脉动，且电磁阀快速启闭会在管路中形成液压冲击，二者综合作用致使各喷头的实际喷雾压力发生波动，导致其喷施流量和雾化特性出现畸变。因此，为了揭示其管路压力脉动的变化特性和液压冲击特性，构建了一套 PWM 间歇喷雾式变量喷施系统，并在不同隔膜泵转速、不同PWM控制信号频率和占空比下进行了压力脉动和液压冲击的综合测试研究。结果表明：随着隔膜泵转速的增加，压力脉动周期逐渐变小，幅值逐渐变大；随着 PWM 信号频率的增加，液压冲击和压力波动趋于压力脉动的形式，周期逐渐变小，幅值逐渐变大；而 PWM 信号占空比对液压冲击和压力波动的影响不明显。
재PWM 간헐분무식변량분시계통중，격막빙간헐성흡배액등특점회재관로중형성압력맥동，차전자벌쾌속계폐회재관로중형성액압충격，이자종합작용치사각분두적실제분무압력발생파동，도치기분시류량화무화특성출현기변。인차，위료게시기관로압력맥동적변화특성화액압충격특성，구건료일투 PWM 간헐분무식변량분시계통，병재불동격막빙전속、불동PWM공제신호빈솔화점공비하진행료압력맥동화액압충격적종합측시연구。결과표명：수착격막빙전속적증가，압력맥동주기축점변소，폭치축점변대；수착 PWM 신호빈솔적증가，액압충격화압력파동추우압력맥동적형식，주기축점변소，폭치축점변대；이 PWM 신호점공비대액압충격화압력파동적영향불명현。
In PWM intermittent variable spraying system , the intermittent imbibing and draining of diaphragm pump lead-ing to pressure pulsation , and the rapidly start/stop of solenoid valves leading to hydraulic impact , all these working to-gether generates the fluctuation of spraying pressure in every sprayer .And the pressure fluctuation leads to the distortion of the spraying quantity and atomization character .In order to study the characters of pressure pulsation and hydraulic im-pact , a PWM interval atomizing variable spraying system was constructed and comprehensive test and study of pressure pulsation and hydraulic impact in different diaphragm pump rotate speed , different rates of PWM controlling signals and different duty ratios was conducted .It turned out that , when diaphragm pump rotate speed increased , the pressure pulsa-tion period gradually decreased , and the amplitude of fluctuation gradually increased;when the rate of PWM controlling signals increased , hydraulic impact and pressure fluctuation tend to the form of pressure pulsation , period decreased and amplitude increased gradually;while PWM duty ratio affect hydraulic impact and pressure fluctuation less .