共查询到20条相似文献,搜索用时 234 毫秒
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针对电动助力转向系统(EPS)在单独Simulink仿真时可视化界面差、多参数修改复杂、不利于仿真曲线综合分析的缺点,采用Labview SIT仿真接口工具包,基于Simulink和Labview两者优点对EPS的助力特性进行联合仿真分析;建立了EPS系统的数学模型,设计了参数控制和输出显示的Labview用户界面,并给出了具体的联合仿真实现过程;联合仿真结果符合单独Simulink仿真时的输出结果,同时,验证了所设计的EPS助力控制算法的可行性;试验表明,联合仿真的可视性好、方便调整参数等,为EPS系统的控制器设计和参数标定提供了一种快速有效的设计方法。 相似文献
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为了使驾驶员能主动感知车辆侧倾状态、防止车辆侧翻,提出了一种新型基于电动助力转向的防侧翻预警系统;利用横向载荷转移率的门限值作为防侧翻预警控制的触发条件,采用助力电机电流补偿控制,当车辆侧倾较大,即横向载荷转移率超过门限值时,预警控制系统使驾驶员操纵转向盘力矩增大,结合侧翻报警灯工作,提醒驾驶员车辆正处于危险工况;MATLAB/Simulink中的仿真分析验证了防侧翻预警控制器能有效的提高车辆的操稳性。 相似文献
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在核电站蒸汽发生器复杂环境下,为准确控制机器人完成管板检测任务,提出了一种基于STM8处理器的爬壁机器人运动控制方法。针对机器人两个不同轴线驱动轮的结构特点,运用运动学理论建立了机器人运动方程,分析了机器人的运动特性。设计了爬壁机器人硬件控制电路,为提高机器人的控制精度,采用了位置环,速度环和电流环三环PID软件控制策略。最后,对此控制方法进行了相关实验验证。实验结果表明,爬壁机器人控制电路设计合理可靠,三环PID算法实现了较好的运动效果,满足设计要求。 相似文献
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超导电动悬浮列车以超导磁体作为核心部件, 具有环境影响小、 高速下自稳定、 安全性能好等优点, 已成为高速轨道交通的重要发展方向之一. 然而, 传统的磁体线圈结构存在绕组内磁场过于集中的问题, 导致磁体的临界电流下降显著, 列车的悬浮及安全性能也受到影响. 针对现有悬浮磁体结构自场集中导致的临界电流衰减问题,本文提出了一种梯形高温超导磁体线圈结构. 建立了一种可以提升磁体临界电流计算效率的均质自洽模型, 设计了梯形结构线圈的结构参数并完成了磁体线圈的绕制. 实验和计算结果表明, 自洽模型计算的磁体临界电流与实验测量值吻合良好, 验证了模型的准确性. 利用该模型对日本山梨试验线上的全尺寸车载高温超导磁体进行了结构优化设计. 研究发现, 优化后的车载磁体绕组内磁场集中程度明显下降, 车载磁体的临界电流及目标区域的磁场强度显著提高. 本研究相关成果可为电动悬浮列车车载磁体的结构设计提供参考. 相似文献
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为了提高LED光源色温和亮度的调节精度和准确度,结合色温由低向高变化时光色所呈现的渐变特点,提出了一种低色温白光LED灯珠、高色温白光LED灯珠加红绿蓝光LED灯珠补偿式调光的方法.将色温分成三个部分进行调节,每个部分选用不同的LED灯珠组合来进行调光.实验结果表明:不同组合情况下的LED光源的初始输出色温相对于目标值的偏差范围在1%以内;亮度可以在保证色温不变的情况下独立进行调节,初始输出值与目标值的偏差范围在1%以内;经过微调之后可以达到目标值;达到了色温和亮度独立调节的要求;光源发光稳定,不会因为长时间工作而影响调节精度. 相似文献
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Muonic and pionic X-rays of the L- and M-series in C and O have been measured with a Si(Li) detector in the energy range between 7 keV and 60 keV. The target consisted of mylar (C5H4O2). Energies and intensities of 21 transitions have been determined. The strong interaction shift of the pionic 2p level in O was measured and found to be +4.1 ±2.3 eV. The measured width of this level is 11±6 eV. The measured yields have been compared with cascade calculations. 相似文献
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A technique combining image processing and laser interferometry for visualizing and detecting the deformation of transparent cylindrical and spherical sample is proposed. This deformation includes geometric deformation such as volume transition in profilometry and physical deformation such as refractive index change in tomography. Phase contour lines are used for quantitative analysis and graphical representation of the deformation. This method allows us to visually detect the spatial variation of the deformation field and to evaluate the test quality such as misalignment of optical system. A theoretical analysis using phase contour map to characterize the deformation field is described in detail. A method using phase contour map to qualify the interferometric test is proposed. Analysis of test examples is carried out. Suggestions on using phase contour line method to ameliorate test system design are finally discussed. 相似文献
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We show that good approximations to the exact equivalent local potential (ELP) and damping factor of a nonlocal Perey-Buck potential can be calculated in the partial wave WKB approximation of Horiuchi. The exact ELP and damping factor are obtained by means of a method previously given by one of us. We also confirm that an approximate ELP proposed by Bauhoff et al. is of comparable accuracy as the Horiuchi approximation. Thesel-dependent ELP's exhibit reduced attraction in the interior and provide a test for higher order WKB approximations. We subsequently obtain an equivalent velocity dependent potential (EVDP) which is even exactly wave function equivalent to the original nonlocal potential. This almost local potential, unlike the trivial equivalent local potential, is smooth and well-behaved and is therefore particularly useful in nuclear reactions where the off-shell behaviour of the potential is important. 相似文献
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Sergio Doplicher 《Foundations of Physics》2010,40(7):719-732
It was shown in the early seventies that, in Local Quantum Theory (that is the most general formulation of Quantum Field Theory,
if we leave out only the unknown scenario of Quantum Gravity) the notion of Statistics can be grounded solely on the local
observable quantities (without assuming neither the commutation relations nor even the existence of unobservable charged field
operators); one finds that only the well known (para)statistics of Bose/Fermi type are allowed by the key principle of local
commutativity of observables. In this frame it was possible to formulate and prove the Spin and Statistics Theorem purely
on the basis of First Principles. 相似文献
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Mario Rabinowitz 《International Journal of Theoretical Physics》2009,48(3):706-722
Discrepancies and accords between quantum (QM) and classical mechanics (CM) related to expectation values and periods are
generally found for both the harmonic oscillator (SHO) and a free particle in a box (FPB), which may apply generally. These
indicate non-locality is expected throughout QM. The FPB energy states violate the Correspondence Principle. Previously unexpected
accords are found and proven that 〈x
2〉
CM
=〈x
2〉
QM
and τ
CM
=τ
QMb
(beat period i.e. beats between the phases for adjoining energy states) for the SHO for all quantum numbers, n. However, for the FPB the beat periods differ at small n. It is shown that a particle’s velocity in an infinite square well varies, no matter how wide the box, nor how far the particle
is from the walls. The quantum free particle variances share an indirect commonality with the Aharonov-Bohm and Aharonov-Casher
effects in that there is a quantum action in the absence of a force. The concept of an “Expectation Value over a Partial Well
Width” is introduced. This paper raises the question as to whether these inconsistencies are undetectable, or can be empirically
ascertained. These inherent variances may need to be fixed, or nature is manifestly more non-classical than expected. 相似文献
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