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2019 27th Iranian Conference on Electrical Engineering (ICEE)最新文献

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Hybrid Photonic Crystal Cavity as a Sensitive Label-Free Biosensor 混合光子晶体腔作为灵敏的无标签生物传感器
Pub Date : 2019-04-01 DOI: 10.1109/IranianCEE.2019.8786436
Fatemeh Rahman Zadeh, H. Kaatuzian, Mohammad Danaie
In this paper, a two-dimensional (2D) photonic crystal (PC) structure with a triangular lattice is designed for using as a biosensor. It has the ability to detect bio-targets with refractive indices between 1.33 (water) and 1.5. As the refractive indices of sensitive holes change, a significant shift in the peak of transmission is observed. This structure consists of air holes in silicon slab with 0.48a thickness and 10 $a$ × 10a µm2 active area which has band gap and waveguide modes for TE polarization. Finite difference time domain (FDTD) and plane wave expansion (PWE) methods have been used for the analysis. We've used effective refractive index of silicon for 2D simulation. The simulation results yield a maximum sensitivity of 300 nm/RIU and a quality factor of 418. These results compared with previous experimental or simulated results show considerable improvements.
本文设计了一种具有三角形晶格的二维光子晶体(PC)结构,用于生物传感器。它具有探测折射率在1.33(水)和1.5之间的生物目标的能力。当敏感孔的折射率发生变化时,透射峰发生明显的位移。该结构由厚度为0.48a的硅板上的气孔和10 $a$ × 10aµm2的有源面积组成,具有带隙和用于TE极化的波导模式。采用时域有限差分法(FDTD)和平面波展开法(PWE)进行了分析。我们使用硅的有效折射率进行二维模拟。仿真结果表明,最大灵敏度为300 nm/RIU,质量因子为418。这些结果与以往的实验或模拟结果相比,有很大的改进。
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引用次数: 7
Adaptive Sliding Mode Control of Step-Up/Step-Down Z-Source DC-DC Converter 升压/降压z源DC-DC变换器的自适应滑模控制
Pub Date : 2019-04-01 DOI: 10.1109/IranianCEE.2019.8786536
S. Ahmadzadeh, G. Markadeh, Navidreza Abiadi
In this paper a Z-Source Converter (ZSC) with step-up/step-down characteristics and minimal number of passive elements is studied. The converter employs two active switches with complement gate commands. In order to regulate the output voltage of the converter a robust and adaptive non-linear control approach is presented. In this case an adaptive sliding mode control (ASMC) method is applied for the converter output voltage regulation. The feedback control law is applied based on sliding condition realization. The proposed sliding mode control (SMC) method guarantees asymptotic stability as well as robustness against input voltage variation and load resistance uncertainty. In order to demonstrate the capability of the proposed controller, simulation results, obtained by PSIM software, are presented.
本文研究了一种具有升压/降压特性、无源元件数量最少的z源变换器。转换器采用两个带有补码门命令的有源开关。为了调节变换器的输出电压,提出了一种鲁棒自适应非线性控制方法。在这种情况下,采用自适应滑模控制(ASMC)方法对变换器输出电压进行调节。采用基于滑动条件实现的反馈控制律。所提出的滑模控制(SMC)方法保证了系统的渐近稳定性以及对输入电压变化和负载电阻不确定性的鲁棒性。为了验证所提控制器的性能,给出了PSIM软件的仿真结果。
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引用次数: 2
Active Microfluidic Micromixer Design using Ionic Polymer-Metal Composites 基于离子聚合物-金属复合材料的主动微流控微混合器设计
Pub Date : 2019-04-01 DOI: 10.1109/IranianCEE.2019.8786743
Mohsen Annabestani, Hajar Mohammadzadeh, Afarin Aghassizadeh, S. Azizmohseni, M. Fardmanesh
In most of the microfluidic applications, it is necessary to have a mixed fluid from the beginning, but in microchannels, due to facing with low Reynolds flows, the fluids flow in the channel by the laminar regimes. Hence the mixing process is a challenging problem and researchers are trying to present fast and reliable micromixers. In this paper, using Ionic Polymer-Metal Composites (IPMCs), an active micromixer has been designed. To investigate the appropriateness of IPMC, using experimental and simulation tests, we show that the IPMC actuator is a potential candidate as an active element of microfluidic micromixers.
在大多数微流体应用中,从一开始就必须有混合流体,但在微通道中,由于面临低雷诺数流动,流体在通道中以层流形式流动。因此,混合过程是一个具有挑战性的问题,研究人员正在努力提出快速可靠的微型混合器。本文采用离子聚合物-金属复合材料(IPMCs)设计了一种有源微混合器。为了研究IPMC的适用性,通过实验和仿真测试,我们表明IPMC驱动器是微流控微混合器的潜在候选有源元件。
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引用次数: 12
Electromagnetic Attenuation Factor Based NDE Approach for Depth Detection of Hidden Defects Using HTS rf-SQUID 基于电磁衰减因子的HTS rf-SQUID深度缺陷无损检测方法
Pub Date : 2019-04-01 DOI: 10.1109/IranianCEE.2019.8786373
Behnoush Rostami, F. Shanehsazzadeh, M. Fardmanesh
We present a new approach for non-destructive evaluation (NDE) in homogeneous and isotropic metallic objects which contain defects at unknown depths based on single scan and multi frequency excitation. As known, there is an optimum frequency for each depth of defect. Finding the depth of an unknown defect requires us to find the optimal frequency. In conventional single frequency methods, the optimal frequency is obtained by applying a wide range of frequencies to the system separately and comparing the corresponding results in a time-consuming process. Conventional multi frequency inspections were introduced to obtain more information about test specimens. There are two ways to apply multiple excitation frequencies to the test sample. First way is to apply them sequentially to a single excitation coil which is still time consuming and the second method is to apply them simultaneously to multiple coils. In simultaneous excitation the testing time is shorter, but its processing of phase and amplitude signals is still challenging. We propose and examine the capability of the multi frequency eddy current (MFEC) method to detect the depth of hidden cracks in a shorter time period; using our HTS SQUID gradiometer-based system. The measurements are performed in a noisy environment, and a planar double-D shaped printed-circuit-board coil is used as the excitation coil. Comparing with the results of the consecutive single frequency excitation measurements, the obtained depths of the flaws using MFEC method was confirmed.
提出了一种基于单次扫描和多频激励的未知深度缺陷均质和各向同性金属物体无损检测方法。众所周知,对于缺陷的每个深度都有一个最佳频率。寻找未知缺陷的深度需要我们找到最佳频率。在传统的单频方法中,通过对系统分别施加大范围的频率并比较相应的结果来获得最优频率,这是一个耗时的过程。为了获得更多的试件信息,采用了常规的多频检测方法。有两种方法可以对测试样品施加多个激励频率。第一种方法是将它们依次应用于单个励磁线圈,这仍然是耗时的;第二种方法是将它们同时应用于多个线圈。同时激励的测试时间较短,但其相位和幅度信号的处理仍然具有挑战性。提出并验证了多频涡流(MFEC)方法在较短时间内检测隐藏裂纹深度的能力;使用我们的HTS SQUID梯度仪系统。测量是在噪声环境下进行的,采用平面双d形印刷电路板线圈作为激励线圈。通过与连续单频激励测量结果的比较,验证了MFEC方法得到的缺陷深度。
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引用次数: 2
Transformer Leakage Flux Frequencies Analysis under Internal Windings Faults 内部绕组故障下变压器漏磁频率分析
Pub Date : 2019-04-01 DOI: 10.1109/IranianCEE.2019.8786753
S. Hajiaghasi, M. M. Hosseini Ahmadi, Z. Rafiee, Ahmad Selemnia
Inter-turn winding faults are one of the most important faults occurs in transformers and if it not quickly detected, develop into serious faults that would result in harmful damage to transformer. In this paper, the effects of leakage flux variation under inter-turn winding fault conditions are studied. To analyze the transformer behavior under inter-turn winding faults, a three-phase transformer with actual dimensions is modelled using time stepping finite element method (TSFEM). For experimental investigation of leakage flux, four search coils are installed on the HV windings of the transformer and the frequency spectrum of search coils are analyzed. Search coils signature analysis for various situations of inter-turn faults and transformer operation are extracted. The obtained results show that leakage flux analysis can be used as an attractive and reliable method for transformer inter-turn fault detection.
匝间绕组故障是变压器中最重要的故障之一,如果不及时发现,就会发展成严重的故障,对变压器造成危害。本文研究了匝间绕组故障条件下漏电通量变化的影响。为了分析变压器在匝间绕组故障下的行为,采用时间步进有限元法对实际尺寸的三相变压器进行了建模。为了进行漏磁的实验研究,在变压器的高压绕组上安装了四个搜索线圈,并对搜索线圈的频谱进行了分析。提取了各种匝间故障和变压器运行情况下的搜索线圈特征分析。结果表明,漏电通量分析是一种可靠的变压器匝间故障检测方法。
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引用次数: 1
Weighted I-Vector Based Text-Independent Speaker Verification System 基于加权i向量的文本无关说话人验证系统
Pub Date : 2019-04-01 DOI: 10.1109/IranianCEE.2019.8786420
Mohsen Mohammadi, H. R. Sadegh Mohammadi
Speaker recognition is one of the most common and user-friendly methods for biological signals based people identification. Nowadays, Speaker verification based on factor analysis and i-vector space has a great impact on the performance improvement of these systems. In this paper, a method is proposed for weighting the model and test vectors, which utilizes the statistical characteristics of target training vectors. The effect of the use of weighted vectors on the accuracy of scoring and the performance of the entire speaker verification system was evaluated for Mel-frequency cepstral coefficients (MFCC) and power-normalized cepstral coefficients (PNCC) feature vectors, and two scoring methods, i.e., the cosine distance and probabilistic linear discriminant analysis (PLDA). TIMIT database has been used in the evaluation of the system. The test results indicate that the use of proposed weighted vectors reduces the error rate of the speaker verification system significantly.
说话人识别是基于生物信号的人物识别中最常用、最友好的方法之一。目前,基于因子分析和i-向量空间的说话人验证对这些系统的性能提升有很大影响。本文提出了一种利用目标训练向量的统计特性对模型和测试向量进行加权的方法。针对Mel-frequency倒谱系数(MFCC)和功率归一化倒谱系数(PNCC)特征向量,以及余弦距离和概率线性判别分析(PLDA)两种评分方法,评估了加权向量的使用对评分精度和整个说话人验证系统性能的影响。该系统的评价使用了TIMIT数据库。实验结果表明,所提出的加权向量显著降低了说话人验证系统的错误率。
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引用次数: 1
New Finite-time Stability and Boundedness Conditions for Time-Delay Switched Linear Systems with Finite-Time Unstable and Unbounded Subsystems 具有有限时间不稳定和无界子系统的时滞切换线性系统的有限时间稳定性和有界性新条件
Pub Date : 2019-04-01 DOI: 10.1109/IranianCEE.2019.8786408
S. Pashaei, F. Hashemzadeh
In this paper, finite-time stability and finite-time boundedness of a class of switched delay systems with subsystems which are not finite-time stable and finite-time bounded is investigated. Based on Lyapunov-Krasovskii functional technique and the average dwell time approach new delay-dependent criteria which guarantee finite-time stability and finite-time boundedness of time-delay switched linear systems is proposed. In other words, the obtained necessary and sufficient conditions guarantee finite-time stability and finite-time boundedness of linear switched delay systems while some subsystems are not finite-time stable and finite-time bounded. Finally, simulation results are provided to show the effectiveness of the proposed method. The numerical results illustrate the effect of switching signals and the total dwell time of finite-time unstable and finite-time unbounded subsystems on finite-time stability and finite-time boundedness of time-delay switched linear systems.
研究了一类具有非有限稳定有限有界子系统的切换时滞系统的有限时间稳定性和有限时间有界性。基于Lyapunov-Krasovskii泛函技术和平均停留时间方法,提出了保证时滞切换线性系统有限时间稳定性和有限时间有界性的新的时滞相关准则。换句话说,所得到的充要条件保证了线性切换延迟系统的有限时间稳定性和有限时间有界性,而某些子系统则不具有有限时间稳定性和有限时间有界性。最后通过仿真结果验证了所提方法的有效性。数值结果说明了切换信号和有限时间不稳定和有限时间无界子系统的总停留时间对时滞切换线性系统的有限时间稳定性和有限时间有界性的影响。
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引用次数: 1
Study on Different Dimensions of C-type Corona Rings in 400 kV Insulator Strings Based on FEM Analysis of Electric Field Distribution 基于电场分布有限元分析的400kv绝缘子串c型电晕环不同尺寸研究
Pub Date : 2019-04-01 DOI: 10.1109/IranianCEE.2019.8786424
Roghieh Sardast, F. Faghihi, M. Vakilian
This paper presents analysis of electric field distribution and optimization of C-type corona rings for 400 kV V-insulator strings composed of ceramic insulator units which are the most common configuration of overhead transmission lines. These strings are equipped with corona rings to enhance the insulation performance regarding to the effect of these rings on the insulation function and potential and electric field distribution. 3D field simulations are performed for the C-type of corona rings with different dimensions by software based on FEM analysis.
本文对架空输电线路中最常见的由陶瓷绝缘子单元组成的400 kV v型绝缘子串的c型电晕环的电场分布进行了分析和优化。这些字符串配有电晕环提高绝缘性能对于这些戒指绝缘功能的影响和潜在的和电场分布。在有限元分析的基础上,利用软件对不同尺寸的c型日冕环进行了三维场模拟。
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引用次数: 1
Chattering-free Higher Order Sliding Mode and Unscented Kalman Filter for Blood Glucose Level Control 无抖振高阶滑模和无气味卡尔曼滤波控制血糖水平
Pub Date : 2019-04-01 DOI: 10.1109/IranianCEE.2019.8786476
F. Jarollahi, A. Karsaz
A new hybrid scheme is proposed for the blood glucose (BG) regulatory system in type-l diabetes mellitus (T1DM) patients. Some of hybrid glucose-insulin controllers have combined the artificial intelligence such as fuzzy logic and metaheuristic algorithm with well-known Palumbo model. However, most of those approaches have focused on the glucose reference tracking, and the glucose sensor errors as well as various unmeasurable disturbances have not been well studied. In this paper, a hybrid method based on higher order sliding mode (HoSM) and unscented Kalman filter (UKF) has been presented. The high performance of the proposed hybrid scheme for desired BG level tracking and chattering reduction in presence of daily glucose level disturbances has been verified.
提出了一种新的混合方案,用于1型糖尿病(T1DM)患者的血糖(BG)调节系统。一些混合血糖-胰岛素控制器将模糊逻辑和元启发式算法等人工智能与著名的Palumbo模型相结合。然而,这些方法大多集中在葡萄糖参考跟踪上,葡萄糖传感器误差以及各种不可测量的干扰尚未得到很好的研究。本文提出了一种基于高阶滑模(HoSM)和无气味卡尔曼滤波(UKF)的混合方法。在日常葡萄糖水平干扰的情况下,所提出的混合方案在理想的BG水平跟踪和颤振减少方面的高性能已经得到验证。
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引用次数: 0
Event-based Control and Scheduling Co-Design in Networked Control Systems with Bandwidth Limitation 带宽限制下网络控制系统的事件控制与调度协同设计
Pub Date : 2019-04-01 DOI: 10.1109/IranianCEE.2019.8786642
A. Nazarzadeh, M. Montazeri
Event-based networked control systems (EBNCS) are a new branch of networked control systems (NCS) which some concept of digital systems such as sampling rate are eliminated, and data is transmitted based on system dynamics and disturbances. Using the network in these control systems induced new limitations, That the most important of those is bandwidth limit. Scheduling methods are the solution to handle this limitation in NCS. Although This concept has been developed and its algorithms have been extended in time-based NCS, these methods are not usable in event-based NCS; because in these systems, event scheduling requires the simultaneous design of the event-triggering rule and the control algorithm with respect of the bandwidth limit. In this paper, the above issue is examined and lead to a new co-design of control and scheduling. The design is based on linear matrix inequality (LMI) and guaranteed stability and performance due to the Lyapunov approach. This method is evaluated with numerical simulation on four coupled inverted pendulums.
基于事件的网络控制系统(EBNCS)是网络控制系统(NCS)的一个新分支,它消除了采样率等数字系统的概念,并根据系统的动力学和扰动进行数据传输。在这些控制系统中使用网络会产生新的限制,其中最重要的是带宽限制。调度方法是在NCS中处理这一限制的解决方案。虽然这一概念已经得到了发展,其算法也在基于时间的网络控制中得到了扩展,但这些方法在基于事件的网络控制中是不可用的;因为在这些系统中,事件调度要求在带宽限制方面同时设计事件触发规则和控制算法。本文对上述问题进行了研究,并提出了一种新的控制与调度协同设计。该设计基于线性矩阵不等式(LMI),并通过Lyapunov方法保证了稳定性和性能。通过四个耦合倒立摆的数值模拟对该方法进行了验证。
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引用次数: 4
期刊
2019 27th Iranian Conference on Electrical Engineering (ICEE)
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