共查询到19条相似文献,搜索用时 343 毫秒
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针对双边LCLC对称补偿型电场耦合式无线电能传输系统补偿网络阶数高输出特性易受影响的问题,采用电路理论建立系统输出功率和效率与等效耦合电容、旁路并联电容、频率以及负载等易变参数之间的解析关系,并通过MATLAB仿真详细分析系统输出功率和效率与各参数的变化规律。仿真结果表明,系统效率对等效耦合电容的变化具有较高的鲁棒性,当旁路并联电容小于理论设计值时,不仅能够减小交叉耦合带来的影响也可使系统输出功率和效率都达到最优;系统效率在谐振频率值的两侧取得最大;输出功率随负载的等效阻抗增加而增加,系统效率不随负载变化。最后通过实验验证理论推导和仿真分析的正确性。 相似文献
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《仪器仪表学报》2020,(5)
目前,心脏起搏器谐振式无线充电系统存在比吸收率(SAR)安全问题。为最大限度避免SAR损伤,在频率10~100 kHz范围内,设计了一种基于LCC-C补偿的谐振式无线供能系统。同时考虑到频率、线圈偏移及补偿参数对系统传输性能的影响,建立了考虑等效串联电阻(ESR)的损耗电路模型。通过分析不同频率、LC参数和耦合系数条件下系统的输出功率和传输效率,综合确定了最佳频率及补偿参数。最后搭建实验系统检验系统供能效率、抗偏移能力、以及相应安全指标;结果表明,在两线圈圆心距横向偏移0~2/3条件下系统传输效率可达43.3%~73.2%,最大温升仅为0.8℃,且无需进行SAR评估,为提高人体植入式设备的安全性设计提供了一种有效的方法。 相似文献
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纳米尺度研究的发展对原子力显微镜的核心运动部件——纳米定位平台的定位精度与扫描速度提出了更高要求。针对平台运动耦合与谐振频率两项关键性能展开研究,设计了一种新型基于压电陶瓷驱动的二维高带宽低耦合纳米定位平台。结构设计上,首先提出高刚度并联解耦结构,然后基于内外侧柔性铰链刚度解耦假设,确立了高刚度低耦合设计方案。为进一步提升平台谐振频率,建立尺寸参数优化模型,以平台一阶谐振频率为优化目标进行优化设计。优化结果与有限元仿真结果误差小于6%,验证了设计方法的准确性。最后,加工样机并搭建实验系统。性能实验结果证明本文设计平台达到高带宽低耦合设计目标。平台性能与同类型现有平台相比,谐振频率提升20%,静态耦合降低80%,动态耦合降低30%,有助于原子力显微镜性能提升。 相似文献
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基于电容耦合的非接触电能传输系统模型研究 总被引:2,自引:1,他引:1
电容耦合的非接触电能传输(CPT)技术是基于高频电场耦合来实现的,与现有的电感耦合非接触电能传输(IPT)技术相比,CPT技术克服了磁场能量不能在金属屏蔽环境里进行传输的缺点,还可以减小能量损耗及电磁干扰(EMI)。本文分析了CPT系统的工作原理与等效电路模型。由于CPT系统包含电力电子开关和谐振网络,其时域微分方程模型呈现高阶非线性,本文给出了系统的广义状态空间平均模型(GSSA),将系统的时域非线性模型转换成为频域线性状态空间模型,并依据该模型对CPT系统进行了稳态和暂态动力学行为仿真,分析了电路参数变化对系统传输效率的影响。最后本文通过实验验证了模型及仿真结果。 相似文献
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针对目前无人机的定点降落精度不高,磁耦合谐振式无线电能传输技术在线圈处于非对准的情况下效率会急剧下降。以无线电能传输系统的抗偏移特性为出发点,从耦合线圈的结构和谐振补偿拓扑角度,开展了磁耦合谐振式无线电能传输技术的研究,应用了一种异面重叠的阵列线圈结构的能量传输磁耦合装置。并通过磁通理论分析了该设计结构的可行性,然后通过有限元仿真分析可知,阵列线圈结构的耦合装置使得线圈上方的磁场更加均匀,通过仿真和测试对比在阵列线圈正上方不同位置处的耦合系数,并通过电路仿真在该阵列线圈上方的各种耦合系数下的效率情况,分析可知接收线圈在该阵列线圈上方的耦合系数的变动对整个电路的谐振工作状态造成的影响非常小。搭建的实验系统证明了该系统的恒流输出特性和抗偏移特性。 相似文献
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0INTRODUCTIONVibrationtransmissionfromamachinesourcetoflexiblesupportingstructuresandtheasociatedsoundradiationfromthevibrat... 相似文献
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Xiong Yeping 《机械工程学报(英文版)》1999,12(2)
A new concept, namely, the equivalent mobility matrix of coupling subsystem is proposed, and the corresponding three-subsystem coupling progressive approach is explored. With the new efficient approach presented, the complexity in dealing with a more complicated dynamic coupling system is greatly reduced. The new modeling method is then combined with the theory of power flow to investigate the dynamics of the overall non-rigid isolation system from the viewpoint of energy. The interaction between the resilient machine of its main modes and the resonant behavior of the flexible foundation on power flow transmission is studied. Taking a machine tool mounted on a multi-story working plant as an example, the dynamic characteristics of the machine-foundation coupling system are analyzed, and their effects on power flow transmission are revealed under various service frequency bands. Some advisable control strategies and the design principle for machinery mounted on flexible structure are proposed. 相似文献
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Arnau A García JV Jimenez Y Ferrari V Ferrari M 《The Review of scientific instruments》2008,79(7):075110
A new configuration of automatic capacitance compensation (ACC) technique based on an oscillatorlike working interface, which permits the tracking of the series resonant frequency and the monitoring of the motional resistance and the parallel capacitance of a thickness-shear mode quartz crystal microbalance sensor, is introduced. The new configuration permits an easier calibration of the system which, in principle, improves the accuracy. Experimental results are reported with 9 and 10 MHz crystals in liquids with different parallel capacitances which demonstrate the effectiveness of the capacitance compensation. Some frequency deviations from the exact series resonant frequency, measured by an impedance analyzer, are explained by the specific nonideal behavior of the circuit components. A tentative approach is proposed to solve this problem that is also common to previous ACC systems. 相似文献
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针对电能传输中网侧电流谐波污染严重、电流补偿性能易受主参数影响变化较大等特点,以额定电流 25 A 的并联有源电力滤波器为研究对象,讨论了直流侧电压、直流侧电容 2 个重要主参数的设计方法及对补偿性能的影响,按照跟踪补偿电流和抑制开关频率处的谐波要求,详细分析了滤波电感的选取方法。采用设计的参数和 SPWM 控制策略,在 MATLAB / Simulink 中对系统进行了仿真实验,结果表明系统主参数设计方法可靠有效,优化了电流的补偿性能。 相似文献
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针对光雷一体化测量系统中复杂谐振对伺服单元的不利影响,提出了采用自适应陷波器及观测器滤波反馈组合实现谐振补偿的方法。首先,结合机械结构及频响测试结果分析了系统的谐振特性,指出系统存在雷达天线谐振、雷达机体谐振和天线高阶及轴系耦合谐振等3类主要谐振模式,并求得谐振特性随俯仰角变化的规律。讨论了对这种复杂谐振的补偿方法,提出采用自适应陷波器补偿雷达天线和雷达机体谐振,并利用Kalman观测器滤波反馈抑制天线高阶及轴系耦合谐振的方法。结果表明:经过谐振组合补偿后,各类谐振均得到有效抑制,速度环闭环带宽期望值达到了115 rad/s,阶跃过程过渡时间为0.35 s,在保证闭环控制稳定性的同时满足了系统带宽要求。 相似文献
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鉴于传统Pound-Drever-Hall(PDH)锁相稳频技术在稳定光腔时存在锁定的动态范围很窄且抗干扰能力差等问题,建立一种可拓宽PDH系统动态范围的稳频锁腔方法。采用传统的PDH误差信号除以透射功率来新定义一个PDH误差信号,拓宽了传统的PDH稳频锁腔的线性区域。此外,采用了卡尔曼滤波器,当存在噪声时,也能估计反射镜的状态,并设计了反馈控制系统,使得PDH稳频系统可在更宽的动态范围内快速锁定。仿真结果表明,在存在扰动和噪声情况下,该方法也可以使PDH稳频系统的动态范围增加50倍。 相似文献
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Time?varying mesh stiffness(TVMS) and gear errors include short?term and long?term components are the two main internal dynamic excitations for gear transmission. The coupling relationship between the two factors is usually neglected in the traditional quasi-static and dynamic behaviors analysis of gear system. This paper investigates the influence of short?term and long?term components of manufacturing errors on quasi?static and dynamic behaviors of helical gear system considering the coupling relationship between TVMS and gear errors. The TVMS, loaded static transmission error(LSTE) and loaded composite mesh error(LCMS) are determined using an improved loaded tooth contact analysis(LTCA) model. Considering the structure of shaft, as well as the direction of power flow and bearing location, a precise generalized finite element dynamic model of helical gear system is developed, and the dynamic responses of the system are obtained by numerical integration method. The results suggest that lighter loading conditions result in smaller mesh stiffness and stronger vibration, and the corresponding resonance speeds of the system become lower. Long?term components of manufacturing errors lead to the appearance of sideband frequency components in frequency spectrum of dynamic responses. The sideband frequency components are predominant under light loading conditions. With the increase of output torque, the mesh frequency and its harmonics components tend to be enhanced relative to sideband frequency components. This study can provide effective reference for low noise design of gear transmission. 相似文献