共查询到20条相似文献,搜索用时 93 毫秒
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分析了电磁作用力的原理,对基于电磁感应原理可变阻尼电磁阻尼器进行了新型结构及磁路设计,对设计出的这种阻尼器进行了具体参数设定与应用分析. 相似文献
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介绍了高线性度模拟光电耦合器HCNR201对模拟电压进行隔离的基本原理和典型应用电路.研制了一种基于HCNR201的交直流电压传感器,能实现对交流、直流或交直流混合的电压信号进行隔离.输入衰减部分采用阻容分压器的结构,保证了传感器的带宽.利用线性光耦在有效工作区域内传输比恒定的特性,通过对其工作电流的特殊设置,实现了双极性模拟电压信号的隔离.给出了测试数据和分析结果. 相似文献
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《机械设计与制造》2016,(11)
机械臂运行过程中,关节伺服系统的负载转动惯量和阻尼系数呈现时变特性,现有方法在未知负载转矩的情况下无法完成转动惯量和阻尼系数同时辨识。提出一种基于离散模型参考自适应算法在线同时辨识负载转动惯量和阻尼系数的方法,通过对关节伺服系统电机的机械方程离散化得到含有转动惯量和阻尼系数的模型自适应参考模型,采用朗道离散时间递推参数辨识机制推导模型自适应率进行参数辨识;利用参数辨识结果和设定的误差阈值在线优化控制参数。此方法能在线同时辨识转动惯量和阻尼系数并根据辨识结果优化速度环PI控制器参数值,提高速度的动态响应性能。仿真结果证明了参数辨识方法和控制器参数在线优化方法的有效性。 相似文献
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轴向柱塞泵流量脉动的研究 总被引:2,自引:0,他引:2
徐世君 《机械制造与自动化》2007,36(3):39-41,43
对轴向柱塞泵流量脉动进行了分析研究,通过对流量方程进行傅里叶变换,求得流量方程的另一种表达式,即泵的流量可以分成常量部分以及脉动部分,同时对脉动部分的各次谐波幅值进行了研究和讨论,得出了在系统中加阻尼后,能起到阻容滤波的作用,在一定程度上减小了压力脉动的幅值. 相似文献
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E. V. Grabovskii V. V. Dzhangobegov G. M. Oleinik 《Instruments and Experimental Techniques》2012,55(5):574-579
An inductive divider for measuring voltages near a radiating load, which is a hollow cylindrical assembly compressed by a 3-MA current pulse, is described. Some results that were obtained in experiments on the Angara-5-1 facility using this divider are presented. The nanosecond resolution of the sensor and closeness of its position to the load allow observation of the moment of breakdown of wires using the obtained voltage signals. Analysis of voltage and current signals allows evaluation of the energy deposition to the wires before the breakdown and the parameters of plasma that is generated around them. 相似文献
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介绍了国外起重机分动器的产品情况,并结合汽车起重机的整车特点分析了汽车起重机分动器的设计技术难点,从分动器的主要技术参数确定、整体方案设计和高强度齿轮传动、强制润滑和散热系统、全时驱动差速器、前输出结构及壳体设等方面介绍了百吨级汽车起重机分动器的设计,通过对分动器进行台架和装车试用,验证了分动器总成的开发效果。 相似文献
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D. Yu. Akimov A. I. Bolozdynya Yu. V. Efremenko T. D. Krakhmalova V. A. Kaplin A. V. Kumpan Yu. A. Melikyan E. M. Onishchenko V. V. Sosnovtsev A. V. Shakirov 《Instruments and Experimental Techniques》2014,57(5):615-619
A control circuit for the operation of Hamamatsu R11410-20 photomultiplier tubes (PMTs), which is intended for use in the RED 100 liquid-xenon emission detector, was developed. To prevent the photocathode degradation due to intense flashes that are associated with signals from high-energy cosmic-ray muons, the circuit forms a voltage pulse that is fed to the PMT photocathode and “blocks” the interelectrode gap between the photocathode and the first dynode. Thus, electron current through this gap is stopped for some time, which suffices for the complete collection of ionization electrons in the RED 100 detector after a cosmic muon passes its sensitive volume. The parameters of the circuit are selected such that the PMT relaxation time after the termination of a blocking pulse, which is determined by the transient processes in the divider, is ~200 μs for a divider with a total resistance of 20 MΩ. This is acceptable for the intended application of the RED 100 detector in an experiment on the search for coherent neutrino scattering off xenon nuclei. 相似文献
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Koviljka Stankovi?Miloš Vujisi? Dragan Kova?evi?Predrag Osmokrovi? 《Measurement》2011,44(9):1713-1722
Statistical properties of some basic mass-produced passive electrical circuits used in measurements are analyzed in this paper, using methods for expressing measurement uncertainty of indirectly measured quantities. The focus of this paper is on electrical circuits whose defining parameters are obtained as non-linear functions of component parameters. Variants of voltage divider and Wheatstone bridge circuits significant for measurement practice are investigated in detail. Even if distributions with symmetrical probability density functions (PDFs), such as uniform or normal, are adopted for the parameters of the components comprising a circuit, non-linearity of the circuit function gives rise to asymmetry in the PDF of the circuit’s parameter. The asymmetry of the PDF causes the mean and the nominal value of the circuit parameter to differ. 相似文献
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Yu. I. Isakova A. I. Pushkarev G. E. Kholodnaya 《Instruments and Experimental Techniques》2011,54(2):183-186
The design, main design formulas, and test results of a small-size differential high-voltage divider are presented. The conditions
determining correctness of using the divider for measuring nanosecond high-voltage signals are obtained. It is shown that
the differential voltage divider has some limitations in low- and high-frequency regions. Experiments have been performed
on a TэY-500 pulsed electron accelerator with the following characteristics: the accelerating voltage is 350–450 kV, the base
pulse duration is 100 ns, the rise time is <5 ns, and the complete pulse electron energy is up to 250 J. The pulse repetition
rate is 1–3 pulses/s. To restore the shape of the measured voltage, it is necessary that the output signal from the voltage
divider be integrated. The measurement error does not exceed ±10%. 相似文献
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G. S. Vorobyov M. V. Petrovsky A. A. Rybalko Yu. V. Shulga 《Instruments and Experimental Techniques》2012,55(1):56-58
Circuits and principle of operation of quasioptical power dividers based on two-row periodic structures, formed by grids of
metal bars and a dielectric waveguide placed along their longitudinal axis, are described. The experimental studies of power
divider prototypes in a frequency range of 60–80 GHz have shown a possibility of regulating the emitted power level in the
main divider arm by changing longitudinal and angular coordinates of the two-row periodic structure, which can be used for
designing quasioptical attenuators. 相似文献
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将全球卫星导航系统(GNSS)接收机用于手持移动设备必须降低正交二分频器等大功耗模块的功耗,因此,本文提出了工作于1V电压以下的正交二分频器.使用提出的正交二分频器可使电路在各工艺角下高速稳定的工作,并大大降低模块的功耗.首先,介绍已有的高速二分频器.接着,计算了所提出结构的直流静态偏置,并对提岀的锁存器进行小信号建模和分析.最后,根据小信号模型分析得到的条件和GNSS接收机的应用要求,设计了提出的低功耗结构.实验结果表明:提出的二分频器最高工作频率为6.55 GHz,最低可工作到0.25 GHz,消耗电流为0.8mA,占用面积为0.014 4 mm2.提出的电路结构在0.13 μm CMOS工艺上实现,可稳定工作于1V电压下,目前已成功应用于低功耗的移动GNSS接收机中. 相似文献
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V. A. Kalinnikov N. A. Kuchinskii V. S. Smirnov A. G. Tikhonov N. V. Khomutov 《Instruments and Experimental Techniques》2006,49(2):223-227
A high-voltage transistor voltage divider for photomultiplier tubes consists of a high-resistance linear resistive divider specifying potential distributions between dynodes and emitter followers maintaining this distribution. The divider features a low dissipation power and stable gain of the photomultiplier tube, when the average anode current varies in the entire measurement range. 相似文献