检索结果-内蒙古大学图书馆

correction algorithm for calculating heat transfer in air-cooling condenser based on analyzing steam condensation locations

引用

ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS 2023年第3期45卷 6744-6755页

作者： Li, Mingtao Wang, Zihao Liu, Chunxiao Meng, Xunbiao Zhang, Yan Shi, Jinwen Sun, Xinfeng Li, Gaochao Gao, Lixiao Liu, Duwei Shaanxi Yulin Energy Grp Hengshan Coal Elect Co Lt Prod Technol Dept Yulin Shaanxi Peoples R China Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian Shaanxi Peoples R China Xian Thermal Power Res Inst Co Ltd Energy Conservat & Emiss Reduct Technol Ctr Xian Shaanxi Peoples R China Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn 28 Xianning West Rd Xian Shaanxi Peoples R China Xian Thermal Power Res Inst Co Ltd Energy Conservat & Emiss Reduct Technol Ctr Block ABoyuan Sci & Technol Plaza99Yanxiang Rd Xian Shaanxi Peoples R China

A correction algorithm based on analyzing the steam condensation locations is proposed to address the problem of large errors when calculating the heat transfer of the air-cooling condenser (ACC) in Fluent. By building a detailed geometric model of the ACC and using radiator boundary conditions to simplify the heat-sinking tube bundle, Fluent software was used to calculate the heat transfer of the ACC under four winter operating conditions, and then, the calculation results were further corrected by applying the correction algorithm. The results show that after using the correction algorithm, the errors between calculation results and experiment data are reduced from 4.20 similar to 36.98% to 0.01 similar to 1.79%. When the electric load of the air-cooling generator set or the ambient temperature was low, the condensation velocity increased, for which there would be a local steam-free area in the heat-sinking tube bundle of the ACC, leading to large errors when using the radiator model. At this point, the correction algorithm based on the analysis of steam condensation position can serve to improve the degree of accuracy. Meanwhile, this correction algorithm can be further expanded to use in the simulating calculation of an indirect air-cooling generator set, and it is able to correct the heat transfer calculation result of the air-cooling tower by analyzing the heat transfer condition of circulating water in the heat-sinking tube bundle, so that reliable data can be provided to guide the anti-freezing of the indirect air-cooling generator set.

关键词： Air-cooling condenser steam condensation location correction algorithm flow heat transfer calculation fluent

来源：评论

学校读者我要写书评

暂无评论

The study based on hydrogen-diesel co-direct injection system: A correction algorithm for circulating gas injection mass

引用

ENERGY 2025年 319卷

作者： Yang, Xiyu Yang, Fangliang Dong, Quan Shi, Cheng Li, Nan Zhang, Liang Yanshan Univ Sch Vehicle & Energy Qinhuangdao 066004 Peoples R China Yanshan Univ Hebei Engn Res Ctr Low Carbon Dev & Resource Utili Qinhuangdao 066004 Peoples R China Harbin Engn Univ Inst Power & Energy Engn Harbin 150001 Peoples R China

This study focuses on gas injection mass fluctuation in high-pressure hydrogen coupling direct injection technology for jet ignition, conducting research to optimize injection process stability. Investigating the fluctuation mechanism reveals that diesel pressure fluctuation induced by pilot injection is the fundamental cause for circulating gas injection mass fluctuation. It is found that the free diesel pressure oscillation within the fuel system and gas injection mass fluctuation at varying injection interval time both exhibit an under-damped oscillation pattern. In view of this, the research addresses stability optimization for gas injection mass from two aspects. On the one hand, the mechanism of the Helmholtz filter to reduce pressure fluctuation is explored in system structural aspect, and designed the structural parameters based on its resonant angular frequency. Then, the influence from different volumes on pressure fluctuation within the low-impedance region is analyzed. Through experimental verification, it is known that this method can reduce gas injection mass fluctuation, but it will decrease the total gas injection mass. On the other hand, an energizing time correction algorithm based on predictive model is proposed. By fitting and optimizing the each parameter sub-algorithms, the final corrected injection pulse width is obtained by combining the each parameter sub-algorithms. The results show that the Helmholtz filter can achieve a maximum reduction in gas injection mass fluctuation reaching 69.82 %. But compared with the original system, the total gas injection mass is reduced by about 7.4 %. The correction model can reduce the gas injection mass fluctuation reach up to 83.92 % and do not affect the total gas injection mass. The results can provide a theoretical basis for the advanced engine fuel injection process closed-loop control, and the experimental data can provide a reference for a dual-fuel injection system.

关键词： Dual-fuel injection Hydrogen Gas injection mass fluctuation Helmholtz filter correction algorithm

来源：评论

学校读者我要写书评

暂无评论

A correction algorithm of geometric unsharpness for neutron radiographs via adaptive fusion and total variation

引用

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 2024年 1066卷

作者： Wu, Huajie Wang, Qihong Wu, Yifan Lyu, Yongqiang Gan, Quan Shi, Xueyan Wang, Wen Song, Jing Chinese Acad Sci Hefei Inst Phys Sci Hefei 230031 Peoples R China Univ Sci & Technol China Hefei 230026 Peoples R China SuperRay Technol Co Ltd Qingdao 266041 Peoples R China Int Acad Neutron Sci Qingdao 266199 Peoples R China Neutron Times Innovat Sci & Technol Co Ltd Qingdao 266043 Peoples R China Shandong Key Lab Neutron Sci & Technol Qingdao 266199 Peoples R China

The mobility of accelerator-based neutron sources has laid the foundation for the miniaturization of neutron radiography facilities in response to the increasing industrial requirements. Compared to traditional reactors and spallation neutron sources, miniaturized neutron radiography facilities based on accelerator neutron sources face challenges in achieving a sufficiently high collimation ratio. It leads to a pronounced level of geometric unsharpness on neutron radiographs, which arises from a finite source size and beam divergence. The presence of blurriness in radiographs significantly impairs the ability to accurately visualize the internal structures of the test objects, thus hindering observation. An algorithm combining adaptive fusion with total variation was proposed to correct the geometric unsharpness for neutron radiographs in this paper. In contrast to most traditional restoration algorithms that relied on regularization terms or filters, our proposed method offered both initial restoration and further restoration. The initial restoration procedure involved the utilization of the Richardson- Lucy algorithm coupled with the l 0 smoothing method. This adaptive fusion technique was employed to enhance the sharpness of edges and denoise the neutron radiographs. Finally, the result of the adaptive fusion was embedded into a deblurring model based on total variation to further preserve the edges and restore more details during further restoration. In the experiments, it was demonstrated that our correction algorithm effectively preserved the prominent edges and the details in both the simulated and real neutron radiographs of thin and thick objects, exhibiting fewer ringing effects than traditional algorithms. It is worth mentioning that our work is primarily applicable and significant to neutron generators, but not for reactors or spallation neutron sources that can deliver much better images.

关键词： Neutron radiograph Geometric unsharpness correction algorithm Image restoration

来源：评论

学校读者我要写书评

暂无评论

Extraction algorithm for the Characteristics of the Microwave Connector with correction algorithm

Extraction Algorithm for the Characteristics of the Microwav...

引用

Asia-Pacific Microwave Conference (APMC)

作者： Shin, Yunsang Nam, Sangwook Seoul Natl Univ Sch Elect Engn Seoul South Korea Seoul Natl Univ INMC Seoul South Korea

ISBN: (纸本)9784902339567

This paper introduces an algorithm that accurately extracts the characteristics of the microwave connector. The characteristics of the microwave connector can be extracted by measuring the thru 1 and thru 2 structure. The thru 1 structure is one in which two connector structures face each other. The thru 2 structure is one that has the known line which assumes that the characteristics are obtained by calculation. The characteristics of the connector structure were accurately extracted by applying T model of the thru 1 and thru 2 structures to the proposed algorithm in the 0.1-18 GHz range.

关键词： characterization algorithm correction algorithm microwave connector microwave measurement

来源：评论

学校读者我要写书评

暂无评论

Quantitative Analysis Method and correction algorithm Based on Directivity Beam Pattern for Mismatches between Sensitive Units of Acoustic Dyadic Sensors

引用

SENSORS 2023年第12期23卷 5709-5709页

作者： Yang, Lingmeng Zhu, Zhezheng Chen, Wangnan Gao, Chengchen Hao, Yilong Yang, Zhenchuan Peking Univ Sch Integrated Circuits Beijing 100871 Peoples R China

Acoustic dyadic sensors (ADSs) are a new type of acoustic sensor with higher directivity than microphones and acoustic vector sensors, which has great application potential in the fields of sound source localization and noise cancellation. However, the high directivity of an ADS is seriously affected by the mismatches between its sensitive units. In this article, (1) a theoretical model of mixed mismatches was established based on the finite-difference approximation model of uniaxial acoustic particle velocity gradient and its ability to reflect the actual mismatches was proven by the comparison of theoretical and experimental directivity beam patterns of an actual ADS based on MEMS thermal particle velocity sensors. (2) Additionally, a quantitative analysis method based on directivity beam pattern was proposed to easily estimate the specific magnitude of the mismatches, which was proven to be useful for the design of ADSs to estimate the magnitudes of different mismatches of an actual ADS. (3) Moreover, a correction algorithm based on the theoretical model of mixed mismatches and quantitative analysis method was successfully demonstrated to correct several groups of simulated and measured beam patterns with mixed mismatches.

关键词： acoustic dyadic sensor mismatch quantitative analysis correction algorithm

来源：评论

学校读者我要写书评

暂无评论

Research on English Translation correction algorithm

Research on English Translation Correction Algorithm

引用

作者： Deng, Yanyan Ganzhou Teachers College Ganzhou341000 China

To improve the accuracy of the translation software English results, this article, taking the research of translation correction algorithms, this paper discusses mainly the present situation of the English translation software, demonstrated to improve the accuracy of translation in the necessity, after the correction algorithm were analyzed, and a basic algorithm model, finally for validation algorithm model, first for translation in the process of system design, and then on the basis of this system, The advantages of the proposed algorithm can be verified by comparison with the two mainstream translation systems. Through this study, the algorithm system can effectively improve the accuracy of English translation results, and has certain advantages compared with mainstream translation systems. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： correction algorithm English translation Machine translation

来源：评论

学校读者我要写书评

暂无评论

Stray Light correction algorithm for High Performance Optical Instruments: The Case of Metop-3MI

引用

REMOTE SENSING 2022年第6期14卷 1354-1354页

作者： Clermont, Lionel Michel, Celine Stockman, Yvan Univ Lege Ctr Spatial Liege STAR Inst B-4031 Liege Belgium

Stray light is a critical aspect for high performance optical instruments. When stray light control by design is insufficient to reach the performance requirement, correction by post-processing must be considered. This situation is encountered, for example, in the case of the Earth observation instrument 3MI, whose stray light properties are complex due to the presence of many ghosts distributed on the detector array. We implement an iterative correction method and discuss its convergence properties. Spatial and field binning can be employed to reduce the computation time but at the cost of a decreased performance. Interpolation of the stray light properties is required to achieve high performance correction. For that, two methods are proposed and tested. The first interpolate the stray light in the field domain while the second applies a scaling operation based on a local symmetry assumption. Ultimately, the scaling method is selected and a stray light reduction by a factor of 58 is obtained at 2 sigma (129 at 1 sigma) for an extended scene illumination.

关键词： stray light radiometric accuracy Earth observation correction algorithm ghost reflections

来源：评论

学校读者我要写书评

暂无评论

Evaluation of energy correction algorithm for signals of PET in heavy-ion cancer therapy device

引用

NUCLEAR ENGINEERING AND TECHNOLOGY 2020年第1期52卷 101-108页

作者： Niu, Xiaoyang Yan, Junwei Wang, Xiaohui Yang, Haibo Ke, Lingyun Chen, Jinda Du, Chengming Zhang, Xiuling Zhao, Chengxin Kong, Jie Su, Hong Chinese Acad Sci Inst Modern Phys Lanzhou 730000 Peoples R China Univ Chinese Acad Sci Sch Nucl Sci & Technol Beijing 100049 Peoples R China Chinese Acad Sci Shenzhen Inst Adv Technol Shenzhen 518055 Peoples R China

In order to solve the contradiction between requirements of high sampling rate for acquiring accurate energy information of pulses and large amount of data to be processed timely, the method with an algorithm to correct errors caused by reducing the sampling rate is normally used in front-end read-out system, which is conductive to extract accurate energy information from digitized waveform of pulse. The functions and effects of algorithms, which mainly include polynomial fitting with different fitting times, double exponential function fitting under different sampling modes, and integral area algorithm, are analyzed and evaluated, and some meaningful results is presented in this paper. The algorithm described in the paper has been used preliminarily in a prototype system of Positron Emission Tomography (PET) for heavy-ion cancer therapy facility. (C) 2019 Korean Nuclear Society, Published by Elsevier Korea LLC.

关键词： Positron emission tomography correction algorithm Energy extraction

来源：评论

学校读者我要写书评

暂无评论

Accurate correction method and algorithm of fluorescence secondary inner filter effect (sIEF) in fluorescence quantitative analysis

引用

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023年 288卷 122147页

作者： Li, Wanxiang Fu, Yuchao Liu, Tianyuan Li, Haochen Huang, Meizhen Shanghai Jiao Tong Univ Sch Elect Informat & Elect Engn Dept Instrument Sci & Engn Shanghai 200240 Peoples R China Shanghai Jiao Tong Univ Sch Elect Informat & Elect Engn Dept Elect Engn Shanghai 200240 Peoples R China

Fluorescence spectroscopy is a reliable and widely used analytical method. The fluorescence inner filter effect (IFE) is one of the main obstacles in the application of fluorescence spectroscopy and an error source in fluo-rescence analysis, resulting in the fluorescence spectrum distortion, the spectral shape distortion, and the nonlinearity between fluorescence intensity and fluorophore concentration. An optimized parameter reflecting the self-absorption effect -the fluorescence attenuation absorption index of secondary inner filter effect (sIFE) nopt -is proposed in this paper. Considering the received fluorescence in a direction perpendicular to the incident light, it is related to the solute-solvent system of the fluorescent substance, neither the geometric parameters of the cuvette and the light beam nor the concentration of the fluorescent substance. nopt can accurately reflect the degree to which the fluorescence is affected by the sIFE and correct for any non-ideality of the shapes of exci-tation/emission beams. The principle and determination method of nopt are explained in detail. Accordingly, an algorithm for the fluorescence spectroscopic correction by nopt is designed. To verify the method, the fluorescence spectra and absorbance spectra of the solutions of fluorescein sodium, rhodamine B, rhodamine 6G, and chlorophyll-a with a series of concentration gradients were measured, respectively. The influence of solvent effect on sIFE correction was also studied. The experiments show that different solute-solvent systems of the fluorescent substances have their own nopt. The novel algorithm can determine the nopt, correct the intensity attenuation and the peak red-shift of the fluorescence spectrum caused by the sIFE, expand the linear range of the concentration predicted by the fluorescence intensity, reduce the error of the prediction model, and improve the measurement accuracy.

关键词： Secondary inner filter effect (sIFE) Fluorescence and absorbance spectroscopy The fluorescence attenuation absorption index of sIFE correction algorithm

来源：评论

学校读者我要写书评

暂无评论

Demonstration of a large viewing angle and high-resolution floating three-dimensional display based on the multichannel and multivariable correction algorithm

引用

OPTICAL ENGINEERING 2020年第10期59卷 102410-102410页

作者： Du, Jingyan Sang, Xinzhu Yu, Xunbo Gao, Xin Gao, Chao Yan, Binbin Beijing Univ Posts & Telecommun State Key Lab Informat Photon & Opt Commun Beijing Peoples R China

Floating three-dimensional (3-D) display can provide a natural and realistic 3-D scene. Nowadays, because of stray light and aberration, most floating 3-D displays cannot realize a large viewing angle and high resolution simultaneously, and it directly deteriorates the viewing effect of the 3-D scene. A large viewing angle floating and high-resolution 3-D display based on multichannel and multivariable (MCMV) correction algorithm are presented. The optical system consists of a time-sequential autostereoscopic 3-D display with the directional backlight, a floating lens, and an eye tracker. The 3-D display with the directional backlight provides loss-free resolution for the system. To realize a large viewing angle floating 3-D display, MCMV correction algorithm based on eye tracking is proposed. The 3-D images can be reconstructed by the optical system within the viewing angle of 60 deg. The feasibility of the proposed display method is verified with the experimental results. (C) 2020 Society of Photo-Optical Instrumentation Engineers (SPIE)

关键词： floating three-dimensional display large viewing angle correction algorithm

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：