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从能量平衡的角度建立了静电驱动柔性振膜微泵的平衡方程,基于对压缩过程中振膜动能的考虑,改进了最小能量法压缩模型,结合均匀压力载荷下圆薄膜大挠度形变理论对静电驱动柔性振膜微泵进行理论分析.对振膜与腔体壁面贴合的压缩过程中各能量相互转化的关系进行分析,并与最小能量法模型进行了对比.结果表明,能量平衡法考虑了薄膜振动过程中的动能,故薄膜与腔体具有更大的贴合面积,且以薄膜与腔体完全贴合时作为零应力参考状态降低压缩过程中的薄膜形变势能,计算得到的静电微泵的压缩效率更高,在驱动电压为300 V时,改进的双腔模型中振膜贴合半径为4.06 mm,所得最大压升为87.08 kPa.基于改进的模型,对双腔微泵压升的影响因素进行讨论,发现降低柔性薄膜厚度会使输出压力有所上升,并且减小腔体表面介电层厚度、减小腔体深度与半径可以有助于提高微泵的压升. 相似文献
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为了平面二自由度冗余驱动并联机器人更好地跟踪目标轨迹,在已有计算力矩控制的基础上加入CMAC神经网络作为补偿.CMAC结构中,轨迹跟踪误差与同步误差构造的耦合误差及其变化率组成网络的输入,经过学习后得到补偿力矩.Matlab的仿真结果表明:加入了CMAC网络补偿后,轨迹的跟踪误差与支链的同步误差都能够收敛到0,与经典的计算力矩法比较,精度有较大的提升.在计算力矩法的基础上加入CMAC网络,确实能够实现目标轨迹精确的同步跟踪. 相似文献
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Coordination of Networked Nonlinear Multi-Agents Using a High-Order Fully Actuated Predictive Control Strategy
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Guo-Ping Liu 《IEEE/CAA Journal of Automatica Sinica》2022,9(4):615-623
This paper is concerned with the coordinative control problem of networked nonlinear multi-agents (NNM) with communication delays. A high-order fully actuated (HOFA) model is introduced to describe the nonlinear multi-agents. Based on this model, a HOFA predictive coordination method is proposed to compensate for the communication delays actively and achieve simultaneous stability and consensus. This method largely simplifies the design of networked nonlinear multi-agents and makes the control performance be same for networked nonlinear multi-agents with and without communication delays. The analysis on the closed-loop systems derives the simultaneous stability and consensus criteria of networked nonlinear multi-agents using the HOFA predictive coordination method. With the presented way of designing HOFA predictive coordination controllers, a simulated example demonstrates the advantages of the proposed method. 相似文献
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While strategies employing early or late direct-injection of fuel can improve emissions, they also can lead to impingement of liquid-phase fuel on the piston and/or cylinder wall due to low in-cylinder temperatures and densities during the injection event. Previous work has shown that liquid-phase fuel films formed in this way can lead to pronounced degradations in efficiency and emissions. To avoid these problems, a quantitative understanding of fuel-property effects on the liquid penetration length is needed, and this understanding must include conditions where in-cylinder thermodynamic conditions and the injection rate vary with time. This work reports liquid penetration lengths measured in an optical engine under such time-varying conditions. Diagnostics included laser light scattering for measurement of the liquid length and conventional pressure-data acquisition for heat-release analysis. Unsteady liquid penetration was characterized for different injection timings, injection pressures, intake-manifold pressures, and fuel volatilities to gain an understanding of the relative importance of these factors. Fuel volatility was studied by using two fuels, 2,2,4,4,6,8,8-heptamethylnonane (HMN) and 2,2,4-trimethylpentane (TMP), which have very different volatility characteristics. Measured liquid lengths changed as in-cylinder conditions changed, with increasing temperature and density during the compression stroke causing a decrease in liquid length, and decreasing temperature and density during the expansion stroke causing an increase in liquid length. Intake-manifold pressure and fuel volatility were found to be primary factors governing liquid length. Heat loss from the charge gas to the engine and local charge cooling due to fuel vaporization were found to have a secondary influence on liquid length. Injection pressure was found to have little effect. 相似文献
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