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Multi-dimensional and complicated electromagnetic interference hardware-in-the-loop simulation method 被引量:2
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作者 Shuxia Guo Yafeng Wang +1 位作者 Ruibing Liu Ying Gao 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2015年第6期1142-1148,共7页
A typical electronic communication system, such as GPS receiver, unmanned aerial vehicle's (UAV's) data link, and radar, faces multi-dimensional and complicated electromagnetic interference in operating environmen... A typical electronic communication system, such as GPS receiver, unmanned aerial vehicle's (UAV's) data link, and radar, faces multi-dimensional and complicated electromagnetic interference in operating environment. To measure the anti- interference performance of the electronic communication system in the complicated electromagnetic interference environment, a method of multi-dimensional and complicated electromagnetic interference hardware-in-the-loop simulation in an anechoic room is proposed. It takes into account the characteristics of interference signals and the positional relationship among interference, the receiver and the transmitter of the electronic communication system. It uses the grey relational method and the angular domain mapping error correction method to control the relevant parameters, the microwave switch and so on, thus achieving the approximately actual mapping of the outdoor multi-dimensional and complicated electromagnetic interference in the anechoic room. To verify the effectiveness of this method, the multi-dimensional and complicated electromagnetic interference of the UAV's data link is simulated as an example. The results show that the degree of correlation between the calculated signal to interference ratio of the data link receiver in the actual scene and the measured signal to interference ratio of the data link receiver simulated with this method in the anechoic room is 0.968 1, proving that the method is effective for simulating the complicated electromagnetic interference. 展开更多
关键词 electromagnetic interference hardware-in-the-loopsimulation grey relational method scene mapping correlation error correction.
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Application of wide-field electromagnetic method in shale gas survey in Eastern Kunlun,Qinghai province,China 被引量:5
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作者 YU Zhong-hong YAN Ling-qin +4 位作者 CAI Zhi-jie WANG Jin-hai XU Yong-feng LIN Jia-fu MA Long 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第11期3388-3397,共10页
In order to study the distribution of shale gas reservoir in the Babaoshan Basin of Eastern Kunlun,the wide-field electromagnetic(WFEM)survey was carried out to obtain the spatial distribution characteristics of the u... In order to study the distribution of shale gas reservoir in the Babaoshan Basin of Eastern Kunlun,the wide-field electromagnetic(WFEM)survey was carried out to obtain the spatial distribution characteristics of the underground electrical volume resistivity based on the delineation of the scope of the Babaoshan Basin by regional gravity data.The basic characteristics of the basement,basin framework,and extension,vertical change,burial depth of dark mud shale in this area were identified,and the electrical distribution of the Babaoshan mud shale horizon was revealed,which has been proved to be a good geological effect by drilling.The exploration results show that the WFEM has significant effects on the exploration of shale gas occurrence strata,which meets the needs of investigation and evaluation of multi-layered and large-scale shale gas,and plays a good demonstration role in the follow-up shale gas exploration. 展开更多
关键词 wide field electromagnetic method shale gas Eastern Kunlun Babaoshan Basin
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Calculation of all-time apparent resistivity of large loop transient electromagnetic method with very fast simulated annealing 被引量:4
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作者 李建慧 朱自强 +2 位作者 冯德山 肖建平 彭凌星 《Journal of Central South University》 SCIE EI CAS 2011年第4期1235-1239,共5页
In large loop transient electromagnetic method(TEM),the late time apparent resistivity formula cannot truly reflect the geoelectric model,thus it needs to define the all-time apparent resistivity with the position inf... In large loop transient electromagnetic method(TEM),the late time apparent resistivity formula cannot truly reflect the geoelectric model,thus it needs to define the all-time apparent resistivity with the position information of measuring point.Utilizing very fast simulated annealing(VFSA) to fit the theoretical electromagnetic force(EMF) and measured EMF could obtain the all-time apparent resistivity of the measuring points in rectangular transmitting loop.The selective cope of initial model of VFSA could be confirmed by taking the late time apparent resistivity of transient electromagnetic method as the prior information.For verifying the correctness,the all-time apparent resistivities of the geoelectric models were calculated by VFSA and dichotomy,respectively.The results indicate that the relative differences of apparent resistivities calculated by these two methods are within 3%.The change of measuring point position has little influence on the tracing pattern of all-time apparent resistivity.The first branch of the curve of all-time apparent resistivity is close to the resistivity of the first layer medium and the last branch is close to the resistivity of the last layer medium,which proves the correctness of the arithmetics proposed. 展开更多
关键词 very fast simulated annealing (VFSA) large loop transient electromagnetic method rectangular loop all-time apparent resistivity
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Method for electromagnetic detection satellites scheduling based on genetic algorithm with alterable penalty coefficient 被引量:1
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作者 Jun Li Hao Chen +2 位作者 Zhinong Zhong Ning Jing Jiangjiang Wu 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2014年第5期822-832,共11页
The electromagnetic detection satellite (EDS) is a type of earth observation satellites (EOSs). The Information collected by EDSs plays an important role in some fields, such as industry, science and military. The... The electromagnetic detection satellite (EDS) is a type of earth observation satellites (EOSs). The Information collected by EDSs plays an important role in some fields, such as industry, science and military. The scheduling of EDSs is a complex combinatorial optimization problem. Current research mainly focuses on the scheduling of imaging satellites and SAR satellites, but little work has been done on the scheduling of EDSs for its specific characteristics. A multi-satellite scheduling model is established, in which the specific constrains of EDSs are considered, then a scheduling algorithm based on the genetic algorithm (GA) is proposed. To deal with the specific constrains of EDSs, a penalty function method is introduced. However, it is hard to determine the appropriate penalty coefficient in the penalty function. Therefore, an adaptive adjustment mechanism of the penalty coefficient is designed to solve the problem, as well as improve the scheduling results. Experimental results are used to demonstrate the correctness and practicability of the proposed scheduling algorithm. 展开更多
关键词 electromagnetic detection satellite (EDS) scheduling genetic algorithm (GA) constraint handling penalty function method alterable penalty coefficient.
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An Exact Analytical Method for Magnetic Field Computation and Electromagnetic Torque in a Concentric Magnetic Gear 被引量:12
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作者 JING Libing ZHANG Yuejin 《中国电机工程学报》 EI CSCD 北大核心 2012年第30期I0020-I0020,22,共1页
准确计算磁力齿轮电磁转矩是设计、分析磁力齿轮的关键,采用二维全局解析法计算同心式磁力齿轮气隙磁场。求解场域划分为内外转子永磁体、内外两层气隙和调磁定子的槽形区域,3类子区域的拉普拉斯方程和泊松方程通过边界连续条件建立联... 准确计算磁力齿轮电磁转矩是设计、分析磁力齿轮的关键,采用二维全局解析法计算同心式磁力齿轮气隙磁场。求解场域划分为内外转子永磁体、内外两层气隙和调磁定子的槽形区域,3类子区域的拉普拉斯方程和泊松方程通过边界连续条件建立联系。得到内外两层气隙区域的矢量磁位磁通密度解析表达式,有利于方便、快速、精确地计算任意转子位置的电磁转矩。计算了内外两层气隙磁场和内外转子电磁转矩,将气隙磁场波形和内外转子电磁转矩波形分别与二维有限元法计算波形作比较,结果吻合,证明了方法的正确性和有效性。 展开更多
关键词 磁场计算 精确分析 电磁转矩 齿轮 磁力 磁场分布 泊松方程 拉普拉斯
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Application of Multi-Grid Method to the Computation of Electromagnetic Scattering Problems
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作者 Wang, Chaofu Fang, Dagang 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 1997年第2期1-6,共6页
The multi-grid method has been known as an efficient iterative method for the linear systems and nonlinear systems that arise from finite difference approximations for partial differential equations. In this paper, th... The multi-grid method has been known as an efficient iterative method for the linear systems and nonlinear systems that arise from finite difference approximations for partial differential equations. In this paper, the multigrid method is extended to the application of solving integral equations which appear in electromagnetic scattering problems. The diakoptic theory is used for this purpose. Compared with other methods, the numerical results show that the multigrid method is powerful to solve electromagnetic scattering problems and can be used to compute electromagnetic scattering problems with electrically large bodies and complex structures. 展开更多
关键词 Multi-grid method Diakoptic theory Integral equation electromagnetic scattering problem.
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A high output power 340 GHz balanced frequency doubler designed based on linear optimization method
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作者 LIU Zhi-Cheng ZHOU Jing-Tao +5 位作者 MENG Jin WEI Hao-Miao YANG Cheng-Yue SU Yong-Bo JIN Zhi JIA Rui 《红外与毫米波学报》 北大核心 2025年第2期184-191,共8页
In this paper,a linear optimization method(LOM)for the design of terahertz circuits is presented,aimed at enhancing the simulation efficacy and reducing the time of the circuit design workflow.This method enables the ... In this paper,a linear optimization method(LOM)for the design of terahertz circuits is presented,aimed at enhancing the simulation efficacy and reducing the time of the circuit design workflow.This method enables the rapid determination of optimal embedding impedance for diodes across a specific bandwidth to achieve maximum efficiency through harmonic balance simulations.By optimizing the linear matching circuit with the optimal embedding impedance,the method effectively segregates the simulation of the linear segments from the nonlinear segments in the frequency multiplier circuit,substantially improving the speed of simulations.The design of on-chip linear matching circuits adopts a modular circuit design strategy,incorporating fixed load resistors to simplify the matching challenge.Utilizing this approach,a 340 GHz frequency doubler was developed and measured.The results demonstrate that,across a bandwidth of 330 GHz to 342 GHz,the efficiency of the doubler remains above 10%,with an input power ranging from 98 mW to 141mW and an output power exceeding 13 mW.Notably,at an input power of 141 mW,a peak output power of 21.8 mW was achieved at 334 GHz,corresponding to an efficiency of 15.8%. 展开更多
关键词 linear optimization method(LOM) three-dimensional electromagnetic model(3D-EM) Harmonic impedance optimization Schottky planar diode Terahertz frequency doubler
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Modeling and finite element analysis of transduction process of electromagnetic acoustic transducers for nonferromagnetic metal material testing 被引量:13
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作者 郝宽胜 黄松岭 +2 位作者 赵伟 段汝娇 王珅 《Journal of Central South University》 SCIE EI CAS 2011年第3期749-754,共6页
Facing the problems lack of considering the non-uniform distribution of the static bias magnetic field and computing the panicle displacements in the simulation model of electromagnetic acoustic transducer (EMAT), a... Facing the problems lack of considering the non-uniform distribution of the static bias magnetic field and computing the panicle displacements in the simulation model of electromagnetic acoustic transducer (EMAT), a multi-field coupled model was established and the finite element method (FEM) was presented to calculate the entire transduction process. The multi-field coupled model included the static magnetic field, pulsed eddy current field and mechanical field. The FEM equations of the three fields were derived by Garlerkin FEM method. Thus, the entire transduction process of the EMAT was calculated through sequentially coupling the three fields. The transduction process of a Lamb wave EMAT was calculated according to the present model and method. The results show that, by the present method, it is valid to calculate the particle displacement under the given excitation signal and non-uniformly distributed static magnetic field. Calculation error will be brought about if the non-uniform distribution of the static bias magnetic field is neglected. 展开更多
关键词 metal material nondestructive testing electromagnetic acoustic transducer multi-field coupling Garlerkin method finite element
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Calculation and application of full-wave airborne transient electromagnetic data in electromagnetic detection 被引量:3
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作者 JI Yan-ju ZHU Yu +2 位作者 YU Ming-mei LI Dong-sheng GUAN Shan-shan 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第4期1011-1020,共10页
Airborne electromagnetic transient method enjoys the advantages of high-efficiency and the high resolution of electromagnetic anomalies,especially suitable for mining detection around goaf areas and deep exploration o... Airborne electromagnetic transient method enjoys the advantages of high-efficiency and the high resolution of electromagnetic anomalies,especially suitable for mining detection around goaf areas and deep exploration of minerals.In this paper,we calculated the full-wave airborne transient electromagnetic data,according to the result of numerical research,the advantage of switch-off time response in electromagnetic detection was proofed via experiments.Firstly,based on the full-wave airborne transient electromagnetic system developed by Jilin University(JLU-ATEMI),we proposed a method to compute the full-waveform electromagnetic(EM)data of 3D model using the FDTD approach and convolution algorithm,and verify the calculation by the response of homogenous half-space.Then,through comparison of switch-off-time response and off-time response,we studied the effect of ramp time on anomaly detection.Finally,we arranged two experimental electromagnetic detection,the results indicated that the switch-off-time response can reveal the shallow target more effectively,and the full-waveform airborne electromagnetic system is an effective technique for shallow target detection. 展开更多
关键词 airborne electromagnetic transient method full-waveform FDTD approach convolution algorithm anomaly detection
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Extracting useful high-frequency information from wide-field electromagnetic data using time-domain signal reconstruction 被引量:1
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作者 LING Fan YANG Yang +6 位作者 LI Gang ZHOU Chang-yu HUANG Min WANG Xin ZHANG Heng ZHU Yu-zhen SUN Huai-feng 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第11期3767-3778,共12页
The wide-field electromagnetic method is widely used in hydrocarbon exploration,mineral deposit detection,and geological disaster prediction.However,apparent resistivity and normalized field amplitude exceeding 2048 H... The wide-field electromagnetic method is widely used in hydrocarbon exploration,mineral deposit detection,and geological disaster prediction.However,apparent resistivity and normalized field amplitude exceeding 2048 Hz often exhibit upward warping in data,making geophysical inversion and interpretation challenging.The cumulative error of the crystal oscillator in signal transmission and acquisition contributes to an upturned apparent resistivity curve.To address this,a high-frequency information extraction method is proposed based on time-domain signal reconstruction,which helps to record a complete current data sequence;moreover,it helps estimate the crystal oscillator error for the transmitted signal.Considering the recorded error,a received signal was corrected using a set of reconstruction algorithms.After processing,the high-frequency component of the wide-field electromagnetic data was not upturned,while accurate high-frequency information was extracted from the signal.Therefore,the proposed method helped effectively extract high-frequency components of all wide-field electromagnetic data. 展开更多
关键词 wide-field electromagnetic method crystal oscillator error time series signal resampling signal reconstruction
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The Time-Frequency Characteristics of Pulse Propagation Through Plasma
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作者 Dong Xiaoting Liu Yaxun & Wang Wenbing(Electromagnetic and Communication Laboratory, School of Electronic and Information Engineering,Xi’an Jiaotong University 710049, P. R. China) 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2000年第2期55-60,共6页
In this paper, propagated δ pulses through different distance of plasma are calculated,and their time-frequency characteristics are studied using CWD (Choi-William distribution). It is found that several horizontal s... In this paper, propagated δ pulses through different distance of plasma are calculated,and their time-frequency characteristics are studied using CWD (Choi-William distribution). It is found that several horizontal spectra appear at early arrival time like discrete spectrum, at last time a hyperbolic curve lies in the time-frequency spectrum which corresponds to the frequency-group delay curve of plasma. To understand the time-frequency the property of a signal is helpful for obtaining the plasma parameters. 展开更多
关键词 electromagnetic scattering Scattering center time-frequency analysis
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Sparsity-based efficient simulation of cluster targets electromagnetic scattering
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作者 TIAN Yuguang LIU Yixin +3 位作者 CHEN Xuan CHEN Penghui WANG Jun CHEN Junwen 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2023年第2期299-306,共8页
An efficient and real-time simulation method is proposed for the dynamic electromagnetic characteristics of cluster targets to meet the requirements of engineering practical applications.First,the coordinate transform... An efficient and real-time simulation method is proposed for the dynamic electromagnetic characteristics of cluster targets to meet the requirements of engineering practical applications.First,the coordinate transformation method is used to establish a geometric model of the observation scene,which is described by the azimuth angles and elevation angles of the radar in the target reference frame and the attitude angles of the target in the radar reference frame.Then,an approach for dynamic electromagnetic scattering simulation is proposed.Finally,a fast-computing method based on sparsity in the time domain,space domain,and frequency domain is proposed.The method analyzes the sparsity-based dynamic scattering characteristic of the typical cluster targets.The error between the sparsity-based method and the benchmark is small,proving the effectiveness of the proposed method. 展开更多
关键词 geometric model of the observation scene dynamic electromagnetic scattering simulation sparsity-based method
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Novel electromagnetism-like mechanism method for multiobjective optimization problems 被引量:1
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作者 Lixia Han Shujuan Jiang Shaojiang Lan 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2015年第1期182-189,共8页
As a new-style stochastic algorithm, the electromagnetism-like mechanism(EM) method gains more and more attention from many researchers in recent years. A novel model based on EM(NMEM) for multiobjective optimizat... As a new-style stochastic algorithm, the electromagnetism-like mechanism(EM) method gains more and more attention from many researchers in recent years. A novel model based on EM(NMEM) for multiobjective optimization problems is proposed, which regards the charge of all particles as the constraints in the current population and the measure of the uniformity of non-dominated solutions as the objective function. The charge of the particle is evaluated based on the dominated concept, and its magnitude determines the direction of a force between two particles. Numerical studies are carried out on six complex test functions and the experimental results demonstrate that the proposed NMEM algorithm is a very robust method for solving the multiobjective optimization problems. 展开更多
关键词 electromagnetism-like mechanism(EM) method multi-objective optimization problem PARTICLE Pareto optimal solutions
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Comparison of three formulations for eddy-current problems in a spiral coil electromagnetic acoustic transducer
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作者 石文泽 吴运新 +3 位作者 龚海 赵志然 范吉志 谭良辰 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第4期817-824,共8页
Three differential equations based on different definitions of current density are compared. Formulation I is based on an incomplete equation for total current density (TCD). Formulations II and {I1 are based on inc... Three differential equations based on different definitions of current density are compared. Formulation I is based on an incomplete equation for total current density (TCD). Formulations II and {I1 are based on incomplete and complete equations for source current density (SCD), respectively. Using the weak form of finite element method (FEM), three formulations were applied in a spiral coil electromagnetic acoustic transducer (EMAT) example to solve magnetic vector potential (MVP). The input impedances calculated by Formulation III are in excellent agreement with the experimental measurements. Results show that the errors for Formulations I & II vary with coil diameter, coil spacing, lift-off distance and external excitation frequency, for the existence of eddy-current and skin & proximity effects. And the current distribution across the coil conductor also follows the same trend. It is better to choose Formulation I instead of Formulation Ili to solve MVP when the coil diameter is less than twice the skin depth for Formulation I is a low cost and high efficiency calculation method. 展开更多
关键词 electromagnetic acoustic transducer (EMAT) eddy current finite element method (FEM) skin and proximity effects spiral coil
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Some issues on 2.5-D transient electromagnetic forward
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作者 XIONG Bin MAO Ya-dan 《Journal of Central South University of Technology》 2005年第z1期177-182,共6页
Numerical calculation for two integral transforms in 2.5-D transient electromagnetic forward is a difficult and key task, namely, the inverse Fourier transform and the inverse Laplace transform. Some effective algorit... Numerical calculation for two integral transforms in 2.5-D transient electromagnetic forward is a difficult and key task, namely, the inverse Fourier transform and the inverse Laplace transform. Some effective algorithms for them were described. Based on the known algorithms in DC resistivity on wave-number distribution and selection, we proposed a principle on how to choose the least wave-number concerning the central-loop transient electromagnetic method. First, observe the behavior of transformation function curve with regard to wave-number in Fourier domain. In the light of its asymptote, ascertain the coverage scope of wave-number. Compared with analytic solution, the least wave-number in Fourier domain can be derived. Furthermore, the Laplace numerical inversion algorithm which needs only a few Laplace variables in pure real domain was also introduced here. The procedure was applied to forward modeling on transient electromagnetic field of a vertical magnetic dipole over uniform half-space to demonstrate them effectiveness and general applicability. 展开更多
关键词 transient electromagnetic method 2.5-D FORWARD modeling INVERSE FOURIER TRANSFORM INVERSE LAPLACE TRANSFORM wave-number
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The Computation of the Transient Electromagnetic Response for Ramp Turn-off of a Large Fixed Rectangle Transmitting Loop
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作者 Liu Zheng Yang Sheng 《石油地球物理勘探》 EI CSCD 北大核心 2012年第A02期135-140,共6页
关键词 石油 地球物理勘探 地质调查 油气资源
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基于2D-3D电磁场-路耦合新计算方法的百万千瓦级半速汽轮发电机端部区域多物理场研究 被引量:1
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作者 韩继超 王昕宇 +1 位作者 邱家玉 戈宝军 《中国电机工程学报》 北大核心 2025年第1期217-227,I0018,共12页
核能相对于传统火电具有更加广阔的应用前景,发展高效安全的核电半速汽轮发电机是核电技术发展的关键。作为电力系统的核心装备,随着百万千瓦级核电半速汽轮发电机单机容量的不断提高,其端部区域损耗和发热问题日趋严重。为了提高核电... 核能相对于传统火电具有更加广阔的应用前景,发展高效安全的核电半速汽轮发电机是核电技术发展的关键。作为电力系统的核心装备,随着百万千瓦级核电半速汽轮发电机单机容量的不断提高,其端部区域损耗和发热问题日趋严重。为了提高核电半速汽轮发电机端部电磁场和损耗的计算精度,提出一种2D-3D电磁场-路耦合新计算方法,研究1 407 MV·A核电半速汽轮发电机端部区域内电磁场和端部构件损耗的分布规律,采用磁场储能法和解析法计算得到定子端部漏抗,将定子端部漏抗应用于核电半速汽轮发电机外电路中,对二维瞬态电磁场、三维端部瞬态电磁场以及负载外电路进行了耦合计算,考虑转子旋转、材料特性以及复杂端部构件实际尺寸等因素,研究核电半速汽轮发电机端部电磁场、端部构件磁密和涡流密度的分布情况,确定核电半速汽轮发电机端部构件的损耗。建立了核电半速汽轮发电机三维端部区域流固耦合模型,将新计算方法得到的端部结构件损耗值作为热源,流体网络计算得到端部区域入口速度和出口压力值作为边界条件,计算得到端部区域内复杂流体流动和端部构件温度的分布规律,并与实测值进行对比,验证了所提计算方法的可行性。 展开更多
关键词 半速汽轮发电机 新计算方法 端部电磁场 损耗 温度分布
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阻抗电桥法测量交流分流器时间常数
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作者 冯建 石雷兵 +2 位作者 周碧红 胡俊杰 许峰 《计量学报》 北大核心 2025年第1期75-79,共5页
介绍了四端交流分流器的等效模型,以零磁通电流互感器为电流比例标准,构建了测量交流分流器时间常数这一主要参数的交流电桥,采用多位双级感应分压器对标准交流电阻的电压进行分压,利用差分测量电路实现对被测分流器和标准交流电阻电压... 介绍了四端交流分流器的等效模型,以零磁通电流互感器为电流比例标准,构建了测量交流分流器时间常数这一主要参数的交流电桥,采用多位双级感应分压器对标准交流电阻的电压进行分压,利用差分测量电路实现对被测分流器和标准交流电阻电压差值的测量,通过双路同步采样系统实现电桥信号的测量,并采用离散傅里叶变换算法计算出电压幅值比和相位差,从而计算出被测交流分流器的阻值和时间常数。验证实验表明,测量装置可在20 Hz~3 kHz频率范围内实现100 A以下交流分流器的精密测量,时间常数最佳测量不确定度为8 ns。 展开更多
关键词 电磁计量 交流分流器 时间常数 阻抗电桥法
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时频电磁法三维自适应有限元正演及含油储层灵敏度分析研究
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作者 李宗杰 蔡盼盼 +3 位作者 李清坤 秦策 高文龙 王绪本 《石油地球物理勘探》 北大核心 2025年第3期806-816,共11页
时频电磁法在油气勘探领域应用非常广泛。三维正演模拟能够获得地下三维电性结构的电磁响应,是电磁数据定性解释和电磁勘探观测系统设计的重要工具,也是三维反演的基础。利用时频电磁三维自适应有限元正演模拟算法,求解电场需满足的二... 时频电磁法在油气勘探领域应用非常广泛。三维正演模拟能够获得地下三维电性结构的电磁响应,是电磁数据定性解释和电磁勘探观测系统设计的重要工具,也是三维反演的基础。利用时频电磁三维自适应有限元正演模拟算法,求解电场需满足的二阶偏微分方程,并基于电磁场连续性条件估计后验误差,据此指导网格自适应加密,实现电磁响应的高效、精确模拟。相比传统正演方法,该方法能够在保证计算精度的前提下,有效减少计算量。通过数值算例验证算法的计算精度和效率,然后对油气模型进行模拟,分析时频电磁响应对储层的灵敏度。该研究为利用时频电磁法进行油气勘探提供了重要的参考。 展开更多
关键词 时频电磁法 三维正演 自适应有限元 油气勘探 电磁响应
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新一代电感基准装置的研究与建立
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作者 杨雁 陈妍 +3 位作者 王维 黄璐 戴冬雪 陆文俊 《计量学报》 北大核心 2025年第1期1-6,共6页
采用改进型的麦克斯韦-维恩电桥法,提出一种基于无感电阻法的电桥电阻时间常数影响量补偿方法,研制新型电感基准传递电桥,建立了我国新一代电感基准装置。基于容抗与感抗的等效替代法,提出一种将电感量值直接溯源至电容单位的新方法,缩... 采用改进型的麦克斯韦-维恩电桥法,提出一种基于无感电阻法的电桥电阻时间常数影响量补偿方法,研制新型电感基准传递电桥,建立了我国新一代电感基准装置。基于容抗与感抗的等效替代法,提出一种将电感量值直接溯源至电容单位的新方法,缩短了电感量值溯源链,并验证了麦克斯韦-维恩电桥法复现电感量值的结果。新一代电感基准装置在1 kHz频率下,可复现10 mH、100 mH电感量值,测量不确定度优于2μH/H(k=1)。新电感基准装置的建立完善了我国交流阻抗计量溯源新体系,确保全国电感量值的准确统一,并将应用于新一轮的电感国际关键比对(CCEM-K3)。 展开更多
关键词 电磁计量 电感基准 麦克斯韦-维恩电桥法 无感电阻法 等效替代法 阻抗 量值溯源
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