Article(id=1153780688638697707, tenantId=1146029695717560320, journalId=1146120084050784272, issueId=1153780685195170113, articleNumber=null, orderNo=null, doi=10.19562/j.chinasae.qcgc.2024.02.009, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1688227200000, receivedDateStr=2023-07-02, revisedDate=1690646400000, revisedDateStr=2023-07-30, acceptedDate=null, acceptedDateStr=null, onlineDate=1753012352380, onlineDateStr=2025-07-20, pubDate=1708790400000, pubDateStr=2024-02-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1753012352380, onlineIssueDateStr=2025-07-20, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1753012352380, creator=13701087609, updateTime=1753012352380, updator=13701087609, issue=Issue{id=1153780685195170113, tenantId=1146029695717560320, journalId=1146120084050784272, year='2024', volume='46', issue='2', pageStart='187', pageEnd='374', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=0, articleOrder=1, issueType=-1, specialIssue=null, createTime=1753012351559, creator=13701087609, updateTime=1753058330907, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1153973536604541183, tenantId=1146029695717560320, journalId=1146120084050784272, issueId=1153780685195170113, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1153973536604541184, tenantId=1146029695717560320, journalId=1146120084050784272, issueId=1153780685195170113, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=269, endPage=280, ext={EN=ArticleExt(id=1153780689058128108, articleId=1153780688638697707, tenantId=1146029695717560320, journalId=1146120084050784272, language=EN, title=Impedance Spectroscopy and Characteristic Frequency Analysis of the PEMFC Cold Start Process, columnId=1149809889280750125, journalTitle=Automotive Engineering, columnName=Selected Papers, runingTitle=null, highlight=null, articleAbstract=
In order to optimize the cold start process of PEMFC,it is essential to provide sufficient feedback data. Common impedance spectroscopy and equivalent circuits cannot provide sufficient and real-time feedback due to long acquisition period. Therefore,the cold start impedance model is developed in COMSOL,and the change of impedance spectroscopy is analyzed in combination with experiments. The characteristic frequencies of 1kHz,50Hz and 1Hz are proposed in the high,medium and low frequency ranges respectively to characterize the cold start process of the fuel cell. The results show the above characteristic frequencies vary significantly in the pre-,mid- and post-cold start phases,with the change in impedance at characteristic frequencies of 1 kHz,50Hz and 1Hz of 0.38,0.31 and 1.47 respectively. It improves the real-time performance of data acquisition while retaining feature information compared to obtaining the full impedance spectroscopy and fitting the equivalent circuit. Therefore,the impedance at the characteristic frequency points can be used to characterize the cold start process,which provides real-time monitoring for the internal state of the cold start.
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为优化质子交换膜燃料电池(PEMFC)冷启动过程,提供足量的反馈数据十分必要,常见的阻抗谱和等效电路因其获取周期较长,无法提供足量且实时的反馈。为此,本文在COMSOL中建立冷启动阻抗模型,结合试验分析其阻抗谱变化,分别在高、中、低频区间提出特征频率1 kHz、50 Hz和1 Hz用于表征燃料电池冷启动过程。研究发现,上述特征频率在冷启动的前、中、后3个阶段变化显著,在特征频率1 kHz、50 Hz和1 Hz下阻抗的变化倍率分别为0.38、0.31和1.47。相较于获取完整的阻抗谱和拟合等效电路,在保留了特征信息的情况下提高了采集数据的实时性。因此,可利用特征频率点的阻抗表征冷启动过程,为实时监测冷启动内部状态提供条件。
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Study of anode and cathode starvation effects on the impedance characteristics of proton exchange membrane fuel cells[J]. Journal of Electroanalytical Chemistry,2016,775: 273-279., articleTitle=null, refAbstract=null), Reference(id=1173212222676419083, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=[13], rfOrder=12, authorNames=null, journalName=null, refType=null, unstructuredReference=YANG M C,HSUEH C H. Impedance analysis of working PEMFCs in the presence of carbon monoxide[J]. Journal of the Electrochemical Society,2006,153(6): A1043-A1048., articleTitle=null, refAbstract=null), Reference(id=1173212222756110860, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=[14], rfOrder=13, authorNames=null, journalName=null, refType=null, unstructuredReference=YUAN X Z,LI H,YU Y,et al. Diagnosis of contamination introduced by ammonia at the cathode in a polymer electrolyte membrane fuel cell[J]. International Journal of Hydrogen Energy,2012,37(17): 12464-12473., articleTitle=null, refAbstract=null), Reference(id=1173212222831608333, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=[15], rfOrder=14, authorNames=null, journalName=null, refType=null, unstructuredReference=HUO S,JIAO K,PARK J W. On the water transport behavior and phase transition mechanisms in cold start operation of PEM fuel cell[J]. Applied Energy,2019,233-234: 776-788., articleTitle=null, refAbstract=null), Reference(id=1173212222928077326, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=[16], rfOrder=15, authorNames=null, journalName=null, refType=null, unstructuredReference=REZAEI NIYA S M,PHILLIPS R K,HOORFAR M. Process modeling of the impedance characteristics of proton exchange membrane fuel cells[J]. Electrochimica Acta,2016,191: 594-605., articleTitle=null, refAbstract=null), Reference(id=1173212223003574799, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=[17], rfOrder=16, authorNames=null, journalName=null, refType=null, unstructuredReference=MENG H. A PEM fuel cell model for cold-start simulations[J]. Journal of Power Sources,2008,178(1): 141-150., articleTitle=null, refAbstract=null), Reference(id=1173212223209095696, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=[18], rfOrder=17, authorNames=null, journalName=null, refType=null, unstructuredReference=PUKRUSHPAN J T. Modeling and control of fuel cell systems and fuel processors[D]. University of Michigan,2003., articleTitle=null, refAbstract=null), Reference(id=1173212223297176081, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=[19], rfOrder=18, authorNames=null, journalName=null, refType=null, unstructuredReference=THOMPSON E L,CAPEHART T W,FULLER T J,et al. Investigation of low-temperature proton transport in nafion using direct current conductivity and differential scanning calorimetry[J]. Journal of the Electrochemical Society,2006,153(12): A2351-A2362., articleTitle=null, refAbstract=null), Reference(id=1173212225243333138, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=[20], rfOrder=19, authorNames=null, journalName=null, refType=null, unstructuredReference=PISTONO A,RICE-YORK C A,BOOVARAGAVAN V. Electrochemical impedance spectroscopy detection of saturation level in a frozen polymer electrolyte membrane fuel cell[J]. Journal of the Electrochemical Society,2011,158(2): B233-B238., articleTitle=null, refAbstract=null), Reference(id=1173212225306247699, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=[21], rfOrder=20, authorNames=null, journalName=null, refType=null, unstructuredReference=Hydrogen and Fuel Cell Technologies Office. DOE technical targets for fuel cell systems and stacks for transportation applications[EB/OL]. [2017]. https://www.energy.gov/eere/fuelcells/doe-technical-targets-fuel-cell-systems-and-stacks-transportation-applications., articleTitle=null, refAbstract=null)], funds=[Fund(id=1173212221644620286, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, awardId=22XD1423800, language=CN, fundingSource=
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低温启动阻抗试验测试台, figureFileSmall=Q/dUfOKLZcXUZ60rZZD6wQ==, figureFileBig=h8BnTYrqKq7baEHrafq/YA==, tableContent=null), ArticleFig(id=1173212217139937758, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, language=EN, label=null, caption=null, figureFileSmall=LPFOiJotRqQ4JYlZUntIsQ==, figureFileBig=goteXy4P41onqKEkzSpERw==, tableContent=null), ArticleFig(id=1173212217265766879, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, language=CN, label=图3, caption=
低温启动动态阻抗谱仿真结果, figureFileSmall=LPFOiJotRqQ4JYlZUntIsQ==, figureFileBig=goteXy4P41onqKEkzSpERw==, tableContent=null), ArticleFig(id=1173212217341264352, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, language=EN, label=null, caption=null, figureFileSmall=yAgRAjHmMuy+pu3pvUtxDA==, figureFileBig=D0Ez2PDgfIbSu3QztRgm7w==, tableContent=null), ArticleFig(id=1173212217408373217, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, language=CN, label=图4, caption=
低温启动动态阻抗谱试验结果, figureFileSmall=yAgRAjHmMuy+pu3pvUtxDA==, figureFileBig=D0Ez2PDgfIbSu3QztRgm7w==, tableContent=null), ArticleFig(id=1173212217475482082, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, language=EN, label=null, caption=null, figureFileSmall=qdP/TWZsdIxIy8eI0U9rxQ==, figureFileBig=lzWin7KjD4AVnmvXr2lSrA==, tableContent=null), ArticleFig(id=1173212217525813731, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, language=CN, label=图5, caption=
冷启动时水结冰过程 (a)燃料电池内部;(b)冷启动第1阶段,反应产生水膜吸水;(c)冷启动第2阶段,反应产生的液态水逐步堵住气孔;
(d)冷启动第3阶段,大量水结冰完全堵住气孔。
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等效电路模型, figureFileSmall=VxckgKnpVdchaguczcEyJg==, figureFileBig=OL0WM4xiIjwPd1HPGRPQaQ==, tableContent=null), ArticleFig(id=1173212217722946022, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, language=EN, label=null, caption=null, figureFileSmall=edQzV9FE1piMc2Xbu+pzxA==, figureFileBig=2yNVannDoUIBmGD9xBYnSA==, tableContent=null), ArticleFig(id=1173212217798443495, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, language=CN, label=图7, caption=
仿真拟合结果, figureFileSmall=edQzV9FE1piMc2Xbu+pzxA==, figureFileBig=2yNVannDoUIBmGD9xBYnSA==, tableContent=null), ArticleFig(id=1173212217907495400, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, language=EN, label=null, caption=null, figureFileSmall=QbOmFgPhY96hSa9B93tYIQ==, figureFileBig=afM5r1eLgB9NYrdsXVtdpQ==, tableContent=null), ArticleFig(id=1173212217974604265, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, language=CN, label=图8, caption=
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仿真数据不同频率区间阻抗变化, figureFileSmall=YRs+5e0BRgRh2zEZa9Tgyg==, figureFileBig=eTNd+Eb07Ks7ixl0+sxQAw==, tableContent=null), ArticleFig(id=1173212218284982764, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, language=EN, label=null, caption=null, figureFileSmall=gLr3MdMFMp8FUESqtgh20g==, figureFileBig=N0ILrTsZW0hEskg0tsbEdg==, tableContent=null), ArticleFig(id=1173212218343703021, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, language=CN, label=图10, caption=
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| 参数 | 数值 |
| BP,GDL,CL,膜厚度/μm | 1 050,215,10,18 |
| 反应面积/cm2 | 25 |
| 质子交换膜等效摩尔质量/(kg∙mol-1) | 0.976 |
| CL中电解质体积分数 | 0.2 |
| GDL,CL接触角/(°) | 120,100 |
| GDL,CL孔隙率 | 0.75,0.4 |
| BP,GDL,CL电导率/(S∙m-1) | 20 000,300,300 |
| 质子交换膜密度/(kg∙m-3) | 2 010 |
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PEMFC的基本物理参数
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| 参数 | 数值 |
| BP,GDL,CL,膜厚度/μm | 1 050,215,10,18 |
| 反应面积/cm2 | 25 |
| 质子交换膜等效摩尔质量/(kg∙mol-1) | 0.976 |
| CL中电解质体积分数 | 0.2 |
| GDL,CL接触角/(°) | 120,100 |
| GDL,CL孔隙率 | 0.75,0.4 |
| BP,GDL,CL电导率/(S∙m-1) | 20 000,300,300 |
| 质子交换膜密度/(kg∙m-3) | 2 010 |
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| 参数 | 方程/数值 |
| 氢气的动力黏度 /(kg∙m-1∙s-1) | |
| 氧气的动力黏度 /(kg∙m-1∙s-1) | |
| 水蒸气的动力黏度 /(kg∙m-1∙s-1) | |
| 液态水的动力黏度 /(kg∙m-1∙s-1) | |
| 氢气的扩散率 /(m2∙s-1) | |
| 氧气的扩散率 /(m2∙s-1) | |
| 水蒸气的扩散率 /(m2∙s-1) | |
| 气体组分 有效扩散率 ( )/(m2∙s-1) | |
| 过冷却水和冰的密度 /(kg∙m-3) | |
| 过冷却水表面张力系数 /(N∙m-1) | |
| 表观传递系数 | |
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质量传输参数和方程
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| 参数 | 方程/数值 |
| 氢气的动力黏度 /(kg∙m-1∙s-1) | |
| 氧气的动力黏度 /(kg∙m-1∙s-1) | |
| 水蒸气的动力黏度 /(kg∙m-1∙s-1) | |
| 液态水的动力黏度 /(kg∙m-1∙s-1) | |
| 氢气的扩散率 /(m2∙s-1) | |
| 氧气的扩散率 /(m2∙s-1) | |
| 水蒸气的扩散率 /(m2∙s-1) | |
| 气体组分 有效扩散率 ( )/(m2∙s-1) | |
| 过冷却水和冰的密度 /(kg∙m-3) | |
| 过冷却水表面张力系数 /(N∙m-1) | |
| 表观传递系数 | |
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| 参数 | 公式/数值 |
| 反应气体 /(mol∙m-3∙s-1) | |
| 水蒸气 /(kg∙m-3∙s-1) | |
| 过冷水 /(kg∙m-3∙s-1) | |
| 膜水 /(kg∙m-3∙s-1) | |
| 冰 /(kg∙m-3∙s-1) | |
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反应气体、水蒸气、过冷水、膜水、冰的源项汇总
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| 参数 | 公式/数值 |
| 反应气体 /(mol∙m-3∙s-1) | |
| 水蒸气 /(kg∙m-3∙s-1) | |
| 过冷水 /(kg∙m-3∙s-1) | |
| 膜水 /(kg∙m-3∙s-1) | |
| 冰 /(kg∙m-3∙s-1) | |
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| 水的状态 | 相变传输 |
| 水蒸气和液态水 /(kg∙m-3∙s-1) | |
| 水蒸气和冰 /(kg∙m-3∙s-1) | |
| 液态水和冰 /(kg∙m-3∙s-1) | |
| 膜态水和水蒸气 /(mol∙m-3∙s-1) | |
| 膜态水和过冷水 /(mol∙m-3∙s-1) | |
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不同水状态之间的相变和传输源项
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| 水的状态 | 相变传输 |
| 水蒸气和液态水 /(kg∙m-3∙s-1) | |
| 水蒸气和冰 /(kg∙m-3∙s-1) | |
| 液态水和冰 /(kg∙m-3∙s-1) | |
| 膜态水和水蒸气 /(mol∙m-3∙s-1) | |
| 膜态水和过冷水 /(mol∙m-3∙s-1) | |
), ArticleFig(id=1173212219119649270, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 方程/数值 |
| 可逆热 /(W∙m-3) | |
| 活化热 /(W∙m-3) | |
| 欧姆热 /(W∙m-3) | |
| 相变潜热 /(W∙m-3) | |
| PEM,CL,GDL,BP比热容 / (J∙kg-1∙K-1) | |
| PEM,CL,GDL,BP固有热导率 /(W∙m-1∙K-1) | |
| 过冷却水和水蒸气的相变潜热 /(J∙kg-1) | |
| 过冷却水和冰的相变潜热 /(J∙kg-1) | |
| 膜态水和水蒸气的相变潜热 /(J∙kg-1) | |
| 反应中的熵变量 /(J∙kmol-1∙K-1) | |
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热量源项的计算方程及热量传输参数
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| 参数 | 方程/数值 |
| 可逆热 /(W∙m-3) | |
| 活化热 /(W∙m-3) | |
| 欧姆热 /(W∙m-3) | |
| 相变潜热 /(W∙m-3) | |
| PEM,CL,GDL,BP比热容 / (J∙kg-1∙K-1) | |
| PEM,CL,GDL,BP固有热导率 /(W∙m-1∙K-1) | |
| 过冷却水和水蒸气的相变潜热 /(J∙kg-1) | |
| 过冷却水和冰的相变潜热 /(J∙kg-1) | |
| 膜态水和水蒸气的相变潜热 /(J∙kg-1) | |
| 反应中的熵变量 /(J∙kmol-1∙K-1) | |
), ArticleFig(id=1173212219308392952, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 数值 |
| 启动温度/℃ | -20 |
| 膜初始湿度λ | 3 |
| 启动电流密度/(mA∙cm-2) | 10 |
| 激励电流密度/(mA∙cm-2) | 1 |
| 频率范围/ Hz | 0.5~104 |
), ArticleFig(id=1173212221237772793, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, language=CN, label=表6, caption=
零下启动动态阻抗谱仿真及试验条件
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| 参数 | 数值 |
| 启动温度/℃ | -20 |
| 膜初始湿度λ | 3 |
| 启动电流密度/(mA∙cm-2) | 10 |
| 激励电流密度/(mA∙cm-2) | 1 |
| 频率范围/ Hz | 0.5~104 |
), ArticleFig(id=1173212221334241786, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 频率区间 | 方差 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 |
| 高频区间 | 7.78×10-4 | 0.39/ 10 kHz | 0.40/ 8 kHz | 0.40/ 5 kHz | 0.41/ 4 kHz | 0.42/ 2.5 kHz | 0.42/ 2 kHz | 0.43/ 1.6 kHz | 0.44/ 1.25 kHz | 0.44/ 1 kHz | 0.45/ 800 Hz | 0.46/ 500 Hz | 0.47/ 400 Hz | 0.48/ 250 Hz |
| 中频区间 | 3.56×10-4 | 0.49/ 200 Hz | 0.50/ 160 Hz | 0.51/ 125 Hz | 0.51/ 100 Hz | 0.52/ 80 Hz | 0.51/ 50 Hz | 0.51/ 40 Hz | 0.51/ 25 Hz | 0.52/ 20 Hz | 0.57/ 16 Hz | | | |
| 低频区间 | 0.02 | 0.97/ 10 Hz | 0.99/ 8 Hz | 1.05/ 5 Hz | 1.07/ 4 Hz | 1.15/ 2 Hz | 1.22/ 1 Hz | 1.28/ 0.8 Hz | 1.41/ 0.5 Hz | | | | | |
), ArticleFig(id=1173212221401350651, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, language=CN, label=表7, caption=
高、中、低频区间各频率点变化倍率仿真结果
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| 频率区间 | 方差 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 |
| 高频区间 | 7.78×10-4 | 0.39/ 10 kHz | 0.40/ 8 kHz | 0.40/ 5 kHz | 0.41/ 4 kHz | 0.42/ 2.5 kHz | 0.42/ 2 kHz | 0.43/ 1.6 kHz | 0.44/ 1.25 kHz | 0.44/ 1 kHz | 0.45/ 800 Hz | 0.46/ 500 Hz | 0.47/ 400 Hz | 0.48/ 250 Hz |
| 中频区间 | 3.56×10-4 | 0.49/ 200 Hz | 0.50/ 160 Hz | 0.51/ 125 Hz | 0.51/ 100 Hz | 0.52/ 80 Hz | 0.51/ 50 Hz | 0.51/ 40 Hz | 0.51/ 25 Hz | 0.52/ 20 Hz | 0.57/ 16 Hz | | | |
| 低频区间 | 0.02 | 0.97/ 10 Hz | 0.99/ 8 Hz | 1.05/ 5 Hz | 1.07/ 4 Hz | 1.15/ 2 Hz | 1.22/ 1 Hz | 1.28/ 0.8 Hz | 1.41/ 0.5 Hz | | | | | |
), ArticleFig(id=1173212221460070908, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 频率区间 | 方差 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 |
| 高频区间 | 1.84×10-3 | 0.25/ 10 kHz | 0.26/ 8 kHz | 0.26/ 6 kHz | 0.28/ 5 kHz | 0.30/ 4 kHz | 0.36/ 2.5 kHz | 0.38/ 1 kHz | 0.36/ 796 Hz | 0.32/ 505 Hz | 0.30/ 315 Hz | 0.30/ 198 Hz | | | | |
| 中频区间 | 3.19×10-4 | 0.30/ 158 Hz | 0.30/ 125 Hz | 0.30/ 100 Hz | 0.31/ 79 Hz | 0.31/ 63 Hz | 0.31/ 50 Hz | 0.31/ 38 Hz | 0.32/ 31 Hz | 0.32/ 24 Hz | 0.33/ 19 Hz | 0.35/ 15 Hz | 0.36/ 12 Hz | | | |
| 低频区间 | 0.65 | 0.67/ 10 Hz | 0.69/ 8 Hz | 0.71/ 6.3 Hz | 0.74/ 5 Hz | 0.78/ 4 Hz | 0.84/ 3.2 Hz | 0.87/ 2.5 Hz | 0.97/ 2 Hz | 1.09/ 1.6 Hz | 1.26/ 1.3 Hz | 1.47/ 1 Hz | 1.74/ 0.8 Hz | 2.06/ 0.6 Hz | 2.57/ 0.5 Hz | 3.57/ 0.4 Hz |
), ArticleFig(id=1173212221539762685, tenantId=1146029695717560320, journalId=1146120084050784272, articleId=1153780688638697707, language=CN, label=表8, caption=
高、中、低频区间各频率点变化倍率试验结果
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| 频率区间 | 方差 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 | 倍率/ 频率点 |
| 高频区间 | 1.84×10-3 | 0.25/ 10 kHz | 0.26/ 8 kHz | 0.26/ 6 kHz | 0.28/ 5 kHz | 0.30/ 4 kHz | 0.36/ 2.5 kHz | 0.38/ 1 kHz | 0.36/ 796 Hz | 0.32/ 505 Hz | 0.30/ 315 Hz | 0.30/ 198 Hz | | | | |
| 中频区间 | 3.19×10-4 | 0.30/ 158 Hz | 0.30/ 125 Hz | 0.30/ 100 Hz | 0.31/ 79 Hz | 0.31/ 63 Hz | 0.31/ 50 Hz | 0.31/ 38 Hz | 0.32/ 31 Hz | 0.32/ 24 Hz | 0.33/ 19 Hz | 0.35/ 15 Hz | 0.36/ 12 Hz | | | |
| 低频区间 | 0.65 | 0.67/ 10 Hz | 0.69/ 8 Hz | 0.71/ 6.3 Hz | 0.74/ 5 Hz | 0.78/ 4 Hz | 0.84/ 3.2 Hz | 0.87/ 2.5 Hz | 0.97/ 2 Hz | 1.09/ 1.6 Hz | 1.26/ 1.3 Hz | 1.47/ 1 Hz | 1.74/ 0.8 Hz | 2.06/ 0.6 Hz | 2.57/ 0.5 Hz | 3.57/ 0.4 Hz |
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