共查询到18条相似文献,搜索用时 390 毫秒
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本文使用一种五点开关PWM控制算法对高速开关阀控气动执行器进行位置伺服控制。分析了开关阀的启闭滞后现象,并提出了一种修正方法,该方法可有效地消除系统的静态误差。实验结果表明,用高速开关阀可以实现快速、精确的气动执行器位置伺服控制。 相似文献
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使用一种五点开关PWM控制算法对高速开关阀气动执行器进行位置伺服控制。分析了开关阀的启闭滞后现象.并提出了一种修正方法,该方法可有效地消除系统的静态误差。实验结果表明,用高速开关阀可以实现快速、精确的气动执行器位置伺服控制。 相似文献
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基于AMESim的电磁高速开关阀动静态特性研究 总被引:6,自引:1,他引:5
在分析电磁高速开关阀磁路及机液结构的基础上,采用AMESim建立了电磁高速开关阀模型,基于该模型在不同占空比及不同工作频率情况下进行了仿真,分析了PWM信号、电流、阀芯位移关系,从控制角度提出了改善电磁高速开关阀性能的思路。 相似文献
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根据气动泵气压控制系统的需求,设计了基于高速开关阀的气动泵气压控制系统.首先对数字阀的概念、优点和分类进行了概述.介绍了气压控制系统结构,分析了以PWM方式工作的高速开关阀控制原理.采用单片机,设计了气压控制系统硬件结构,开发了驱动电路.最后阐述了PWM信号的产生程序和PWM控制方式.该系统具有开闭效果好、功耗低等优点,而且PWM信号频率和占空比均可调节,表明了高速开关阀在气压控制系统中有广泛的使用价值. 相似文献
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本文使用一种五点开关PWM控制算法对高速开关阀控气动执行器进行位置伺服控制.分析了开关阀的启闭滞后现象,并提出了一种修正方法,该方法可有效地消除系统的静态误差.实验结果表明,用高速开关阀可以实现快速、精确的气动执行器位置伺服控制. 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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高速开关阀以其结构简单、响应速度快、抗污染能力强、稳定性好等优点得到了广泛的应用。水液压高速开关阀的工作介质黏性低,更容易因性能退化发生故障。提出了一种基于机器学习的水液压高速开关阀性能退化状态识别及退化趋势预测方法。搭建了高速开关阀性能测试试验台,将电流信号的变化作为高速开关阀的性能退化指标。根据高速开关阀性能退化程度,将其退化状态定义为正常期、退化期和严重退化期3个阶段。采用BP神经网络(BPNN)方法对高速开关阀的退化状态进行了识别,并采用粒子群优化长短期记忆模型(PSO-LSTM)方法对高速开关阀的退化趋势进行了预测。使用高速开关阀的性能退化试验数据对提出模型的有效性进行了检验,结果表明该方法具有较高的预测精度。 相似文献
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The methods of improving the dynamic performance of high speed on/off solenoid valve include increasing the magnetic force of armature and the slew rate of coil current, decreasing the mass and stroke of moving parts. The increase of magnetic force usually leads to the decrease of current slew rate, which could increase the delay time of the dynamic response of solenoid valve. Using a high voltage to drive coil can solve this contradiction, but a high driving voltage can also lead to more cost and a decrease of safety and reliability. In this paper, a new scheme of parallel coils is investigated, in which the single coil of solenoid is replaced by parallel coils with same ampere turns. Based on the mathematic model of high speed solenoid valve, the theoretical formula for the delay time of solenoid valve is deduced. Both the theoretical analysis and the dynamic simulation show that the effect of dividing a single coil into N parallel sub-coils is close to that of driving the single coil with N times of the original driving voltage as far as the delay time of solenoid valve is concerned. A specific test bench is designed to measure the dynamic performance of high speed on/off solenoid valve. The experimental results also prove that both the delay time and switching time of the solenoid valves can be decreased greatly by adopting the parallel coil scheme. This research presents a simple and practical method to improve the dynamic performance of high speed on/off solenoid valve. 相似文献
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为研究影响数字比例阀先导级高速开关阀响应特性的主要因素,以常闭高速开关阀为研究对象,阐述了该阀结构特征及工作原理,分析了数学机理,运用ANSYS电磁仿真软件建立高速开关阀轴对称二维瞬态电磁模型。通过对高速开关阀电磁特性分析及实验测试,验证了所建模型的正确性。基于该模型在不同线圈匝数、阀芯质量、线圈内阻、复位弹簧刚度、衔铁与挡铁吸合接触面积时,对高速开关阀阀芯运动各阶段进行动态模拟,分析了影响高速开关阀响应特性的主要设计参数。结果表明:线圈匝数对高速开关阀响应速度的影响最大,当线圈匝数增加67%时,高速开关阀开启时间延长27.8%,关闭时间延长11.6%,总响应时间延长21.6%;线圈内阻、阀芯质量与复位弹簧刚度3个因素对高速开关阀响应速度的影响次之,环形接触面积对高速开关阀总响应时间影响较小,磁轭壁厚对高速开关阀运动各阶段响应时间基本没有影响。 相似文献