共查询到19条相似文献,搜索用时 109 毫秒
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对基于超磁致伸缩驱动器的高速液压开关阀进行了初步的研究,设计了单和双联锥体式阀芯的高速开关阀结构,还对这种阀的主要性能参数做了简要分析。 相似文献
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利用超磁致伸缩致动器(Giant magnetostrictive actuator, GMA)应变率大、响应频率高的优点和脉冲喷射装置的结构特点设计了基于GMA的脉冲喷射开关阀,分别分析GMA和脉冲喷射开关阀本体在动态工作条件下的系统传递函数,综合分析后建立阀的流量、喷射速度与驱动电流之间的系统方框图和传递函数。Simulink的开关阀动态仿真结果显示,基于GMA的脉冲喷射开关阀的工作频带宽度大于400 Hz,可满足大部分喷射装置的工作要求。GMA位移扫频试验结果表明,该模型在低频范围内可正确反映开关阀的动态特性,高频范围内需考虑温度和磁滞的影响。 相似文献
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介绍了一种新型的液压高速开关阀 ,它采用了超磁致伸缩驱动器和锥体式阀芯结构。该阀具有很高的切换速度和频率 ,可以用来作为大流量高速开关阀的先导控制阀 ,也可以在小流量回路中直接作为控制阀使用。 相似文献
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设计了两种高速开关阀直接控制和先导控制的液压同步控制系统,采用液压脉宽调制(PWM)控制方式,结构简单,便于集成,可以实现高精度的位移同步控制. 相似文献
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《工业仪表与自动化装置》2015,(5)
设计了基于GMA的液压高速开关阀,针对所设计的高速开关阀进行了静动态特性研究,建立其数学模型,通过数字仿真表明新型高速开关阀的开关时间为1.7 ms和1.9 ms,空载流量达20 l/min以上,并且分析了各参数对高速开关阀的性能影响,得出等效质量越大,阀芯开启上升时间越快,阀芯位移波动现象越严重;黏性阻尼越大,阀芯开启时间越慢,但阀芯位移波动越小;线圈参数对高速开关阀的开关时间影响很大,相同电阻时线圈时间常数越小,则阀芯开关时间越短,反之则越慢。 相似文献
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The work-class remotely-operated-underwater-vehicles(ROVs) are mainly driven by hydraulic propulsion system,and the effeciency of hydraulic propulsion system is an important performance index of ROVs.However,the efficiency of traditional hydraulic propulsion system controlled by throttle valves is too low.Therefore,in this paper,for small and medium ROVs,a novel propulsion system with higher efficiency based on high speed on/off valve control hydraulic propeller is proposed.To solve the conflict between large flow rate and high frequency response performance,a two-stage high speed on/off valve-motor unit with large flow rate and high response speed simultaneously is developed.Through theoretical analysis,an effective fluctuation control method and a novel pulse-width-pulse-frequency-modulation(PWPFM) are introduced to solve the conflict among inherently fluctuation,valve dynamic performance and system efficiency.A simulation model is established to evaluate the system performance.To prove the advantage of system in energy saving,and test the dynamic control performance of high speed on/off valve control propeller,a test setup is developed and a series of comparative experiments is completed.The smimulation and experiment results show that the two-stage high speed on/off valve has an excellent dynamic response performance,and can be used to realize high accuracy speed control.The experiment results prove that the new propulsion system has much more advantages than the traditional throttle speed regulation system in energy saving.The lowest efficiency is more than 40%.The application results on a ROV indicate that the high speed on/off valve control propeller system has good dynamic and steady-state control performances.Its transient time is only about 1 s-1.5 s,and steady-state error is less than 5%.Meanwhile,the speed fluctuation is small,and the smooth propeller speed control effect is obtained.On the premise of good propeller speed control performance,the proposed high speed on/off valve control propeller can improve the effeciency of ROV propulsion system significantly,and provides another attractive ROV propulsion system choice for engineers. 相似文献
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高速开关阀作为高速带钢纠偏装置中的电液转换元件,响应速度快,抗污染能力强,并可方便地实现由计算机直接控制。 相似文献
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为解决流场中的问题,采用CFD方法,对某汽车发动机舱内的前端局部流场进行分析,包括:机舱前端设计不合理,存在漏风、热气回流等。基于CFD的分析结果,有针对性地提出了多个优化方案,对前端模块,风扇进行重新设计,并增设导流板,解决了上述问题,提高了冷却模块的流量。 相似文献
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Journal of Mechanical Science and Technology - The average flow rate of a high speed on/off valve (HSV) is usually obtained by a flow sensor, which leads to pressure loss, structural complexity,... 相似文献
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旋管式离心泵与传统叶片式离心泵在结构上存在较大差异,为研究旋管式离心泵的内流场特性,文中采用数值模拟的方法,构建了旋管式离心泵的流道模型并划分非结构网格,利用Fluent软件对旋管体内流场进行三维流场的数值模拟,并分析了0.6Q,1.0Q,1.4Q三种不同流量工况下的旋管体内流场的流速和压力场分布规律,流量在2.5~7... 相似文献
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