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Improving retrieval precision of NO

Jinpeng YANG

《机械工程前沿（英文）》 2009年 第4卷 第1期   页码 92-96 doi: 10.1007/s11465-009-0001-5

摘要： The NO density error retrieved by the traditional method of differential optical absorption spectroscopy (DOAS) was analyzed. The technique for reducing the error is proposed and used to obtain the NO density of Chengdu through DOAS.

关键词： absorption structure     low-frequency structure     absorption cross-section     NO2 density    

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Improvement to observability measures of LFO modes in power systems with DFIGs

Shenghu LI

《能源前沿（英文）》 2021年 第15卷 第2期   页码 539-549 doi: 10.1007/s11708-019-0617-z

摘要： Observation of the low-frequency oscillation (LFO) modes in power systems is important to design the damping scheme. The state equations of the power system with the doubly-fed induction generators (DFIGs) are derived to find the LFO modes related to the synchronous generator (SGs) and the DFIGs. The definition of the observability measure is improved to consider the initial output and the attenuation speed of the modes. The sensitivities of the observability measures to the control parameters are derived. The numerical results from the small and large-disturbance validate the LFO modes caused by the DFIGs, and different observability measures are compared. Adjustment of the control parameters is chosen based on the sensitivity model to improve the observability and damping ratio of the LFO mode, and the stability of the wind power system.

关键词： wind power system     low-frequency oscillation (LFO)     observability measure     sensitivity     doubly-fed induction generator (DFIG)    

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智能电网状态估计中用于提高数据完整性的超分辨率感知技术 Article

梁高琪, 刘国龙, 赵俊华, 刘艳丽, 顾津锦, 孙广中, 董朝阳

《工程（英文）》 2020年 第6卷 第7期   页码 789-800 doi: 10.1016/j.eng.2020.06.006

摘要：

智能电网是一个结合了可再生能源与先进信息和通信技术的国家关键基础设施，为社会提供经济且安全的电力供应。为了应对可再生能源的间歇性特点并确保智能电网的安全性，应该进行更高频率的状态估计运算，而高频率的状态估计运算需要更加完整的系统状态信息。本文从智能电网状态估计数据完整性角度出发，将如何基于低频数据恢复高频数据的问题视为一个超分辨率感知（super resolution perception, SRP）问题。然后提出了一种新颖的基于机器学习的SRP方法，即超分辨率状态估计网络（super resolution perception net for state estimation, SRPNSE）来提高状态估计的数据完整性。此方法主要包含三部分：特征提取、信息补全和数据重建。算例证明了我们提出的SRPNSE方法在状态估计中从低频数据恢复至高频数据的有效性和实用价值。

关键词： 状态估计     低频数据     高频数据     超分辨率感知     数据完整性    

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一种基于数据驱动的浅海低频声源目标位置估计方法 Research Articles

孙显彬1,2,贾鑫明1,郑轶2,王振2

《信息与电子工程前沿（英文）》 2021年 第22卷 第7期   页码 1020-1030 doi: 10.1631/FITEE.2000181

摘要： 由于水听器的布置成本高且水下声音传播模型复杂，在浅海环境中进行低频声源目标位置估计较为困难。提出一种基于数据驱动的压缩循环神经网络 （compressed recurrent neural network, C-RNN）模型。该模型首先将矢量水听器接收到的声源信号压缩为动态声强信号，然后将声源位置进行GeoHash编码用于该模型的先验训练，最后使用训练好的模型进行浅海低频声源目标的位置估计。与传统数学模型相比，所提C-RNN模型能在复杂声场环境和地形条件下以低参数工况实时估计声源位置。实验结果表明，该模型对浅海环境中低频声源目标位置的平均定位精度为56米。

关键词： 矢量水听器；浅海；低频；位置估计；循环神经网络    

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Frequency domain a9ctive vibration control of a flexible plate based on neural networks

Jinxin LIU, Xuefeng CHEN, Zhengjia HE

《机械工程前沿（英文）》 2013年 第8卷 第2期   页码 109-117 doi: 10.1007/s11465-013-0252-z

摘要：

A neural-network (NN)-based active control system was proposed to reduce the low frequency noise radiation of the simply supported flexible plate. Feedback control system was built, in which neural network controller (NNC) and neural network identifier (NNI) were applied. Multi-frequency control in frequency domain was achieved by simulation through the NN-based control systems. A pre-testing experiment of the control system on a real simply supported plate was conducted. The NN-based control algorithm was shown to perform effectively. These works lay a solid foundation for the active vibration control of mechanical structures.

关键词： active vibration control (AVC)     neural network (NN)     low frequency noise     frequency domain control     multi-frequency control    

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Comparative study of oscillating flow characteristics of cryocooler regenerator at low temperatures

Yonglin JU , Qingqing SHEN ,

《能源前沿（英文）》 2009年 第3卷 第1期   页码 80-84 doi: 10.1007/s11708-009-0008-y

摘要： A brief review is presented on previous experimental results and correlations on the friction factor of cryocooler regenerators operating at oscillating flow and pulsating pressure conditions, for different mesh sizes of packed woven screens, focusing on the effects of different operating frequencies ranging from 20 to 80 Hz, at room and cryogenic temperatures. A comparison of the friction factor data with those of other studies is presented to clarify the reason for the difference. Finally, a new oscillating flow correlation of regenerators, in terms of several non-dimensional parameters, is discussed and compared.

关键词： friction factor     regenerator     oscillating flow     high frequency    

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Correlation between carbon emissions and energy structure –Reliability analysis of low carbon target

Ben HUA

《能源前沿（英文）》 2011年 第5卷 第2期   页码 214-220 doi: 10.1007/s11708-010-0133-7

摘要： The influence of energy intensity on carbon intensity depends upon the fraction of energy mixes with high carbon emissions in the total energy mixes . The correlation of with a variety of primary energy mix fractions and technology advances such as CCS and CCHP is analyzed and deduced. Taking the long-term carbon reduction target in 2050 settled upon by the Copenhagen Agreement and the mid-term target suggested by the “450 Scenes Program” of the International Energy Agency (IEA) as constraints, the new pattern of the energy transition of the world in 2020, 2030, and 2050 are estimated and figured out. The peak value of energy consumption will lag behind the peak value of carbon emissions; the world energy structure shifting point will be in 2020–2025. Estimates show that China’s mid-2020 and long-term targets of energy-saving and emission reduction announced by the Chinese government might be achieved.

关键词： correlation     carbon emissions     energy consumption     high carbon emissions energy mix     target of emission reduction     reliability    

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Shaking table testing of hard layered soil-pile-structure interaction system

LI Peizhen, REN Hongmei, LU Xilin, SONG Heping, CHEN Yueqing

《结构与土木工程前沿（英文）》 2007年 第1卷 第3期   页码 346-352 doi: 10.1007/s11709-007-0046-7

摘要： Shaking table tests on a dynamic interaction system of hard layered soil, pile foundation and frame structure were carried out. The earthquake damage of the superstructure and foundation was reproduced. Based on these tests, several key issues about the seismic response of the dynamic soil-structure interaction (SSI) system were studied. The natural frequency of the system was less than that of the structure on rigid foundation if the SSI is not taken into account, while its damping ratio was larger than that of the structure. The mode shape of the system was different from that of the structure on the fixed base in that there were rocking and swinging at the foundation. Magnification or reduction of vibration transferred by soil was related to soil characteristic, excitation magnitude, and so on. Generally, sand magnifies vibration, while viscous powder soil dampens vibration. The components of the acceleration response at the top of the superstructure were based on the relative magnitude of the rocking stiffness, the swing stiffness of the foundation and the stiffness of the super-structure. The multi-direction excitations have little effect on the key issues of the horizontal SSI.

关键词： super-structure     Generally     Magnification     frequency     different    

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Research on acoustic-structure sensitivity using FEM and BEM

ZHANG Jun, ZHAO Wenzhong, ZHANG Weiying

《机械工程前沿（英文）》 2007年 第2卷 第1期   页码 62-67 doi: 10.1007/s11465-007-0010-1

摘要： Acoustic-structure sensitivity is used to predict the change of acoustic pressure when a structure design variable is changed. The sensitivity is significant for reducing noise of structure. Using FEM (finite element method) and BEM (boundary element method) acoustic-structure sensitivity was formulated and presented. The dynamic response and response velocity sensitivity with respect to structure design variable were carried out by using structural FEM, the acoustic response and acoustic pressure sensitivity with respect to structure velocity were carried out by using acoustic BEM. Then, acoustic-structure sensitivity was computed by linking velocity sensitivity in FEM and acoustic sensitivity in BEM. This method was applied to an empty box as an example. Acoustic pressure sensitivity with respect to structure thickness achieved in frequency ranges 1 100 Hz, and its change rule along with stimulating frequency and design variable were analyzed. Results show that acoustic-structure sensitivity method linked with FEM and BEM is effective and correct.

关键词： sensitivity method     BEM     acoustic pressure     pressure sensitivity     frequency    

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Analysis and design of pulse frequency modulation dielectric barrier discharge for low power applications

Tang-tang GUO,Xing-liang LIU,Shi-qiang HAO,Chi ZHANG,Xiang-ning HE

《信息与电子工程前沿（英文）》 2015年 第16卷 第3期   页码 249-258 doi: 10.1631/FITEE.1400185

摘要： For low power dielectric barrier discharge (DBD) used in small-size material treatment or portable devices, highstep transformer parasitic capacitance greatly influences the performance of the resonant converter as it is of the same order of magnitude as the equivalent capacitance of DBD load. In this paper, steady-state analysis of the low power DBD is presented, considering the inevitable parasitic capacitance of the high-step transformer. The rectifier-compensated first harmonic approximation (RCFHA) is applied to linearize the equivalent load circuit of DBD at low frequency and the derived expressions are accurate and convenient for the analysis and design of the power supply. Based on the proposed linear equivalent load circuit, the influence of transformer parasitic capacitance on the key parameters, including the frequency range and the applied electrode voltage, is discussed when the power is regulated with pulse frequency modulation (PFM). Also, a design procedure is presented based on the derived expressions. A prototype is constructed according to the design results and the accuracy of the design is verified by experimental results.

关键词： Dielectric barrier discharge     Rectifier-compensated first harmonic approximation     Parasitic capacitance     Power converter design    

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解决未来低惯量电力系统的频率控制难题——英国视角 Perspective

洪启腾, Md Asif Uddin Khan, Callum Henderson, Agustí Egea-Àlvarez, Dimitrios Tzelepis, Campbell Booth

《工程（英文）》 2021年 第7卷 第8期   页码 1057-1063 doi: 10.1016/j.eng.2021.06.005

摘要：

为实现全球艰巨的脱碳目标，电力系统需大规模整合可再生能源发电，这大大降低了系统惯量。除了系统惯量的降低，英国的输电系统还有一些特有的难题：其容量相对较小，同时又与其他输电系统分离，并且可再生资源在整个系统中的分布很大程度上不均匀。本文聚焦英国的输电系统，就低惯量系统中频率控制的相关挑战以及可能的解决方案提出了见解和建议。本文重点讨论了在不同时间尺度上发挥作用的三种主要技术：同步调相机、惯量模拟和快速频率响应。文中借鉴了英国最近的研究和开发项目，评估了其相对优势和局限性及其在解决未来低惯量系统频率控制难题方面的作用。

关键词： 快速频率控制     惯量模拟     同步补偿     低惯量系统    

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Multi-harmonic forced vibration and resonance of simple beams to moving vehicles

《结构与土木工程前沿（英文）》   页码 981-993 doi: 10.1007/s11709-023-0979-5

摘要： This study modeled the moving-vehicle-induced forcing excitation on a single-span prismatic bridge as a multiple frequency-multiplication harmonic load on the modal coordinates of a linear elastic simple Euler–Bernoulli beam, and investigated the forced modal oscillation and resonance behavior of this type of dynamic system. The forced modal responses consist of multiple frequency-multiplication steady-state harmonics and one damped mono-frequency complementary harmonic. The analysis revealed that a moving load induces high-harmonic forced resonance amplification when the moving speed is low. To verify the occurrence of high-harmonic forced resonance, numerical tests were conducted on single-span simple beams based on structural modeling using the finite element method (FEM) and a moving sprung-mass oscillator vehicle model. The forced resonance amplification characteristics of the fundamental mode for beam response estimation are presented with consideration to different end restraint conditions. The results reveal that the high-harmonic forced resonance may be significant for the investigated beams subjected to vehicle loads moving at specific low speeds. For the investigated single-span simple beams, the moving vehicle carriage heaving oscillation modulates the beam modal frequency, but does not induce notable variation of the modal oscillation harmonic structure for the cases that vehicle of small mass moves in low speed.

关键词： forced vibration     linear Euler beam     moving load     harmonic structure     frequency modulation     end restraints    

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极低频探地工程——无线电磁法

陆建勋, 卓贤军, 刘勇, 赵国泽, 底青云

《工程（英文）》 2022年 第10卷 第3期   页码 13-20 doi: 10.1016/j.eng.2021.12.003

关键词： 工程成就    

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Enhanced methane recovery and exoelectrogen-methanogen evolution from low-strength wastewater in an up-flow

Zechong Guo, Lei Gao, Ling Wang, Wenzong Liu, Aijie Wang

《环境科学与工程前沿（英文）》 2018年 第12卷 第4期 doi: 10.1007/s11783-018-1074-3

摘要：

Methane yield increased 22 times from low-strength wastewater by applying conductive fillers.

Conductive fillers accelerated the start-up stage of anaerobic biofilm reactor.

Conductive fillers altered methanogens structure.

关键词： Low-strength wastewater     Methane production     Conductive filler     Microbial community structure    

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极低频探地（WEM）工程

卓贤军,陆建勋,赵国泽,底青云

《中国工程科学》 2011年 第13卷 第9期   页码 42-50

摘要：

“极低频探地（WEM）工程”是国家发展和改革委员会批准的“十一五”国家重大科学技术基础设施建设项目之一，用于资源探测和地震预测及其他前沿科学研究。 文章对工程项目背景、建设内容、关键技术和试验成果作了全面介绍，在此基础上，对工程的应用前景作了展望。

关键词： WEM法     资源探测     地震预测    

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标题 作者 时间 类型 操作

Improving retrieval precision of NO

Jinpeng YANG

期刊论文

Improvement to observability measures of LFO modes in power systems with DFIGs

Shenghu LI

期刊论文

智能电网状态估计中用于提高数据完整性的超分辨率感知技术

梁高琪, 刘国龙, 赵俊华, 刘艳丽, 顾津锦, 孙广中, 董朝阳

期刊论文

一种基于数据驱动的浅海低频声源目标位置估计方法

孙显彬1,2,贾鑫明1,郑轶2,王振2

期刊论文

Frequency domain a9ctive vibration control of a flexible plate based on neural networks

Jinxin LIU, Xuefeng CHEN, Zhengjia HE

期刊论文

Comparative study of oscillating flow characteristics of cryocooler regenerator at low temperatures

Yonglin JU , Qingqing SHEN ,

期刊论文

Correlation between carbon emissions and energy structure –Reliability analysis of low carbon target

Ben HUA

期刊论文

Shaking table testing of hard layered soil-pile-structure interaction system

LI Peizhen, REN Hongmei, LU Xilin, SONG Heping, CHEN Yueqing

期刊论文

Research on acoustic-structure sensitivity using FEM and BEM

ZHANG Jun, ZHAO Wenzhong, ZHANG Weiying

期刊论文

Analysis and design of pulse frequency modulation dielectric barrier discharge for low power applications

Tang-tang GUO,Xing-liang LIU,Shi-qiang HAO,Chi ZHANG,Xiang-ning HE

期刊论文

解决未来低惯量电力系统的频率控制难题——英国视角

洪启腾, Md Asif Uddin Khan, Callum Henderson, Agustí Egea-Àlvarez, Dimitrios Tzelepis, Campbell Booth

期刊论文

Multi-harmonic forced vibration and resonance of simple beams to moving vehicles

期刊论文

极低频探地工程——无线电磁法

陆建勋, 卓贤军, 刘勇, 赵国泽, 底青云

期刊论文

Enhanced methane recovery and exoelectrogen-methanogen evolution from low-strength wastewater in an up-flow

Zechong Guo, Lei Gao, Ling Wang, Wenzong Liu, Aijie Wang

期刊论文

极低频探地（WEM）工程

卓贤军,陆建勋,赵国泽,底青云

期刊论文