Article(id=1322164686452277628, tenantId=1146029695717560320, journalId=1225396423026438145, issueId=1322164546295410919, articleNumber=null, orderNo=null, doi=null, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1738684800000, receivedDateStr=2025-02-05, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1793158225882, onlineDateStr=2026-10-28, pubDate=1764000000000, pubDateStr=2025-11-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1793158225882, onlineIssueDateStr=2026-10-28, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1793158225882, creator=13701087609, updateTime=1793158225882, updator=13701087609, issue=Issue{id=1322164546295410919, tenantId=1146029695717560320, journalId=1225396423026438145, year='2025', volume='45', issue='11', pageStart='1', pageEnd='284', issueExtLink='null', onlineDate='null', pubDate='1764000000000', pubDateStr='2025-11-25', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1793158192465, creator='13701087609', updateTime=1793158905697, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1322167537857573862, tenantId=1146029695717560320, journalId=1225396423026438145, issueId=1322164546295410919, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1322167537861768167, tenantId=1146029695717560320, journalId=1225396423026438145, issueId=1322164546295410919, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=1, endPage=9, ext={EN=ArticleExt(id=1322164688381657471, articleId=1322164686452277628, tenantId=1146029695717560320, journalId=1225396423026438145, language=EN, title=Study on Force Characteristics of Cutting and Crushing of Spiral Cutting Picks for Deep-Sea Cobalt-Rich Crusts, columnId=null, journalTitle=Mining Research and Development, columnName=null, runingTitle=null, highlight=null, articleAbstract=
Based on the spiral cutting pick cutting and crushing method, the cutting and crushing behavior of spiral drum cutting picks on the ore body and the cutting and crushing process were analyzed, and a dynamic model for ore body cutting and crushing based on pick cutting had been constructed. Based on the HMB contact model in EDEM, a simulation model of cutting picks cutting cobalt-rich crust ore bodies was established, a test platform for simulating ore body crushing was prepared, and verification tests on the cutting and crushing force characteristics of single-tooth and full-tooth cutting were carried out. Test and simulation results are basically consistent in overall trends. In the single-tooth spiral drum test, when the cutting speed increases from 0.05 m/s to 0.1 m/s, the cutting resistance increases by 12.2%. In the full-tooth spiral drum test, when the cutting depth increases from 10 mm to 30 mm, the cutting resistance increases by 110%, and the load fluctuation coefficient increases by 43.4%. With the vibration excitation-assisted crushing method, when the cutting depth is 20 mm and 30 mm, the cutting resistance decreases by 16% and 10% respectively. When the cutting depth is 30 mm, the load fluctuation coefficient increases by 16.7%. Test results show that compared with cutting speed, cutting resistance is more sensitive to cutting depth. The greater the cutting depth or the faster the cutting speed, the greater the load fluctuation. The adoption of the vibration excitation-assisted crushing method helps reduce the required cutting force, but the cutting vibration intensifies. The research results can provide technical support for the study on operating parameters of the cutting and crushing technology for deep-sea cobalt-rich crusts and the development of crushing heads.
, authors=Min JIANG
1, 2, 3, Xinjiang LU
2, Bingzheng CHEN
1, 3, Yang AI
1, 3, Wei LIU
1, 3, authorsList=Min JIANG, Xinjiang LU, Bingzheng CHEN, Yang AI, Wei LIU, authorCompany=null, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1322164695113515442, articleId=1322164686452277628, tenantId=1146029695717560320, journalId=1225396423026438145, language=CN, title=深海富钴结壳螺旋截齿截割破碎受力特性研究, columnId=1226462294582936453, journalTitle=矿业研究与开发, columnName=深部、深海矿产资源勘探与开发, runingTitle=null, highlight=null, articleAbstract=
基于螺旋截齿截割破碎方法,分析了矿体的螺旋滚筒截齿截割破碎行为和截割破碎过程,构建了基于截齿截割的矿体截割破碎动力学模型。基于EDEM的HMB接触模型,建立了截齿截割富钴结壳矿体的仿真模型,制备了模拟矿体破碎试验平台,进行了单齿和全齿的截割破碎受力特性验证试验。试验与仿真结果整体趋势基本一致,在单齿滚筒试验中,当截割速度从0.05 m/s增加至0.1 m/s时,截割阻力增长了12.2%;在全齿螺旋滚筒试验中,当截割深度从10 mm增加至30 mm时,截割阻力增长了110%,载荷波动系数增长了43.4%;采用激振辅助破碎方法,当截割深度为20 mm与30 mm时,截割阻力分别下降了16%和10%,在截割深度为30 mm时,载荷波动系数增长了16.7%。试验结果表明:相对于截割速度,截割阻力对截割深度更敏感,截割深度越大或截割速度越快,载荷波动越大;采用激振辅助破碎方法有助于降低所需截割力,但截割振动加剧。研究成果可为深海富钴结壳截割破碎技术作业参数研究和破碎头的研制提供技术支撑。
, authors=江敏
1, 2, 3, 陆新江
2, 陈秉正
1, 3, 艾杨
1, 3, 刘伟
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1.Changsha Institute of Mining Research Co., Ltd., Changsha, Hunan 410012, China
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1.长沙矿山研究院有限责任公司,湖南 长沙 410012
2.中南大学,湖南 长沙 410083
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江敏(1987—),男,湖南株洲人,博士,高级工程师,主要从事深海采矿技术与装备研究。E-mail:jimi87@126.com
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江敏(1987—),男,湖南株洲人,博士,高级工程师,主要从事深海采矿技术与装备研究。E-mail:jimi87@126.com
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1.Changsha Institute of Mining Research Co., Ltd., Changsha, Hunan 410012, China
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1.长沙矿山研究院有限责任公司,湖南 长沙 410012
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34 (8): 243-244., articleTitle=Simulation and analysis on coal cutting process based on EDEM, refAbstract=null)], funds=[Fund(id=1322164702097031688, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, awardId=2021YFC2801702, language=CN, fundingSource=国家重点研发计划项目(2021YFC2801702), fundOrder=null, country=null), Fund(id=1322164702172529161, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, awardId=2021JC0010, language=CN, fundingSource=湖南省自然科学基金项目(2021JC0010), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1322164695327424947, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, xref=1., ext=[AuthorCompanyExt(id=1322164695335813556, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, companyId=1322164695327424947, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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3.国家金属采矿工程技术研究中心,湖南 长沙 410012)])], figs=[ArticleFig(id=1322164699131658724, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=EN, label=Fig.1, caption=
Deep-sea mining system, figureFileSmall=W6JkCdVwpwLNtZLHiK1A9w==, figureFileBig=UquPKazEg0zMHTguZVRJtg==, tableContent=null), ArticleFig(id=1322164699211350501, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=CN, label=图1, caption=
深海采矿系统, figureFileSmall=W6JkCdVwpwLNtZLHiK1A9w==, figureFileBig=UquPKazEg0zMHTguZVRJtg==, tableContent=null), ArticleFig(id=1322164699400094182, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=EN, label=Fig.2, caption=
Cutting and crushing movement process of cutting picks for cobalt-rich crusts, figureFileSmall=o8k+P22sTMvTJSTCEt5kaw==, figureFileBig=uKrJTshN5E8taZcHYCCG/A==, tableContent=null), ArticleFig(id=1322164699463008743, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=CN, label=图2, caption=
富钴结壳的截齿截割破碎运动过程, figureFileSmall=o8k+P22sTMvTJSTCEt5kaw==, figureFileBig=uKrJTshN5E8taZcHYCCG/A==, tableContent=null), ArticleFig(id=1322164699534311912, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=EN, label=Fig.3, caption=
Movement trajectory and speed of the nth cutting pick on the spiral drum, figureFileSmall=JOAMGWzC4Csce8LqD4hGRw==, figureFileBig=/yz1yrdvGrtQrXW31Ow5RQ==, tableContent=null), ArticleFig(id=1322164699626586601, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=CN, label=图3, caption=
螺旋滚筒第n个截齿的运动轨迹及速度, figureFileSmall=JOAMGWzC4Csce8LqD4hGRw==, figureFileBig=/yz1yrdvGrtQrXW31Ow5RQ==, tableContent=null), ArticleFig(id=1322164699689501162, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=EN, label=Fig.4, caption=
Schematic of cutting pick force decomposition, figureFileSmall=43N0CoZ8peTlSqCb3qhlqg==, figureFileBig=B7QQ5iTwvASaJoh1um6S7A==, tableContent=null), ArticleFig(id=1322164699756610027, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=CN, label=图4, caption=
截齿受力分解示意, figureFileSmall=43N0CoZ8peTlSqCb3qhlqg==, figureFileBig=B7QQ5iTwvASaJoh1um6S7A==, tableContent=null), ArticleFig(id=1322164699832107500, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=EN, label=Fig.5, caption=
Simulation model of cutting and crushing ore body, figureFileSmall=a7XDoXHZ+WJiZHssR6d0Vw==, figureFileBig=OSmceGhGiTW64lSsTAzWJQ==, tableContent=null), ArticleFig(id=1322164699899216365, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=CN, label=图5, caption=
截割破碎矿体仿真模型, figureFileSmall=a7XDoXHZ+WJiZHssR6d0Vw==, figureFileBig=OSmceGhGiTW64lSsTAzWJQ==, tableContent=null), ArticleFig(id=1322164699974713838, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=EN, label=Fig.6, caption=
Simulation schematic of the cutting and crushing process, figureFileSmall=1rFRe6MJlok0pQlHDgNnhA==, figureFileBig=1eDI7mhn9Xh7Wq+Db83J5g==, tableContent=null), ArticleFig(id=1322164700066988527, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=CN, label=图6, caption=
截割破碎过程仿真示意, figureFileSmall=1rFRe6MJlok0pQlHDgNnhA==, figureFileBig=1eDI7mhn9Xh7Wq+Db83J5g==, tableContent=null), ArticleFig(id=1322164700146680304, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=EN, label=Fig.7, caption=
Cutting force conditions of cutting picks at a cutting speed of 0.8 m/s with different cutting depths, figureFileSmall=1/1OCOAtSp3p9RycN5gh3Q==, figureFileBig=lH5PFe3drzAy2VoCtvS0UA==, tableContent=null), ArticleFig(id=1322164700209594865, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=CN, label=图7, caption=
截割速度0.8 m/s条件下不同截割深度的截齿受力情况, figureFileSmall=1/1OCOAtSp3p9RycN5gh3Q==, figureFileBig=lH5PFe3drzAy2VoCtvS0UA==, tableContent=null), ArticleFig(id=1322164700306063858, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=EN, label=Fig.8, caption=
Cutting force conditions of cutting picks at a cutting depth of 20 mm with different cutting speeds, figureFileSmall=KoxDZPJ/lNS5mswIAn8cZg==, figureFileBig=wrvdIQYYFEvN/RRRD6pbeA==, tableContent=null), ArticleFig(id=1322164700385755635, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=CN, label=图8, caption=
截割深度20 mm条件下不同截割速度的截齿受力情况, figureFileSmall=KoxDZPJ/lNS5mswIAn8cZg==, figureFileBig=wrvdIQYYFEvN/RRRD6pbeA==, tableContent=null), ArticleFig(id=1322164700465447412, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=EN, label=Fig.9, caption=
Influence of cutting parameters on the average cutting force of cutting picks, figureFileSmall=cKoebf4AWiSreNcJ6jmYaw==, figureFileBig=HqpPMOMj8B4sIYV9ii3Qfg==, tableContent=null), ArticleFig(id=1322164700540944885, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=CN, label=图9, caption=
截割参数对截齿平均受力的影响, figureFileSmall=cKoebf4AWiSreNcJ6jmYaw==, figureFileBig=HqpPMOMj8B4sIYV9ii3Qfg==, tableContent=null), ArticleFig(id=1322164700629025270, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=EN, label=Fig.10, caption=
Test scheme for cutting and crushing force of ore bodies, figureFileSmall=YMaJcfKV+d+ipGMJ2WtPGw==, figureFileBig=5TBBpCLpnnh9ra0sTJn4zA==, tableContent=null), ArticleFig(id=1322164700704522743, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=CN, label=图10, caption=
矿体截割破碎受力试验方案, figureFileSmall=YMaJcfKV+d+ipGMJ2WtPGw==, figureFileBig=5TBBpCLpnnh9ra0sTJn4zA==, tableContent=null), ArticleFig(id=1322164700780020216, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=EN, label=Fig.11, caption=
Cutting resistance at different cutting depths with a cutting speed of 0.075 m/s, figureFileSmall=Tjlf/BBELfCDgtn3GMsCgQ==, figureFileBig=e2C12FCKWmw8L169rY7PZg==, tableContent=null), ArticleFig(id=1322164700847129081, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=CN, label=图11, caption=
截割速度0.075 m/s时不同截割深度下的截割阻力, figureFileSmall=Tjlf/BBELfCDgtn3GMsCgQ==, figureFileBig=e2C12FCKWmw8L169rY7PZg==, tableContent=null), ArticleFig(id=1322164700935209466, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=EN, label=Fig.12, caption=
Cutting resistance at different cutting speeds with a cutting depth of 20 mm, figureFileSmall=jM9Epc5YFQ7AHoeWEMWsJA==, figureFileBig=yWq1YdHyvfjDgUJcjzKasQ==, tableContent=null), ArticleFig(id=1322164701010706939, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=CN, label=图12, caption=
截割深度20 mm时不同截割速度下的截割阻力, figureFileSmall=jM9Epc5YFQ7AHoeWEMWsJA==, figureFileBig=yWq1YdHyvfjDgUJcjzKasQ==, tableContent=null), ArticleFig(id=1322164701077815804, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=EN, label=Fig.13, caption=
Cutting resistance at different cutting depths during the cutting and crushing process of the full-tooth spiral drum, figureFileSmall=4kOKoIxJ2zwMRBlvevLdRw==, figureFileBig=pHMs3p8I2Msx6Wn/biBrVg==, tableContent=null), ArticleFig(id=1322164701144924669, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=CN, label=图13, caption=
全齿螺旋滚筒截割破碎过程中不同截割深度下的截割阻力, figureFileSmall=4kOKoIxJ2zwMRBlvevLdRw==, figureFileBig=pHMs3p8I2Msx6Wn/biBrVg==, tableContent=null), ArticleFig(id=1322164701216227838, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=EN, label=Fig.14, caption=
Comparison of cutting resistance with and without vibration excitation at different cutting depths, figureFileSmall=JPhq7dUE7zWrWLw11khFXw==, figureFileBig=e8UvtVZOykidm4+MNhKbgQ==, tableContent=null), ArticleFig(id=1322164701279142399, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=CN, label=图14, caption=
不同截割深度下有无激振的截割阻力对比, figureFileSmall=JPhq7dUE7zWrWLw11khFXw==, figureFileBig=e8UvtVZOykidm4+MNhKbgQ==, tableContent=null), ArticleFig(id=1322164701350445568, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=EN, label=Table 1, caption=
Particle parameters and bonding parameters of the simulation model of cobalt-rich crust ore body
, figureFileSmall=null, figureFileBig=null, tableContent=
| 颗粒参数 | 黏结参数 |
|---|
| 颗粒半径/mm | 接触半径/mm | 静摩擦因数 | 动摩擦因数 | 单位法向刚度/(N/m) | 单位切向刚度/(N/m) | 法向强度/Pa | 切向强度/Pa |
|---|
| 1 | 1.1 | 0.7 | 0.1 | 1×1010 | 5×109 | 3×107 | 2×106 |
), ArticleFig(id=1322164701425943041, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=CN, label=表1, caption=
富钴结壳矿体仿真模型的颗粒参数与黏结参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 颗粒参数 | 黏结参数 |
|---|
| 颗粒半径/mm | 接触半径/mm | 静摩擦因数 | 动摩擦因数 | 单位法向刚度/(N/m) | 单位切向刚度/(N/m) | 法向强度/Pa | 切向强度/Pa |
|---|
| 1 | 1.1 | 0.7 | 0.1 | 1×1010 | 5×109 | 3×107 | 2×106 |
), ArticleFig(id=1322164701509829122, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=EN, label=Table 2, caption=
Load fluctuation coefficients under different working conditions
, figureFileSmall=null, figureFileBig=null, tableContent=
| 截割速度0.8 m/s | 截割速度0.8 m/s | 截割速度0.8 m/s | 截割速度0.6 m/s | 截割速度1 m/s |
|---|
| 截割深度10 mm | 截割深度20 mm | 截割深度30 mm | 截割深度20 mm | 截割深度20 mm |
|---|
| 0.194 8 | 0.245 5 | 0.281 7 | 0.240 5 | 0.258 6 |
), ArticleFig(id=1322164701593715203, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=CN, label=表2, caption=
不同工况下的载荷波动系数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 截割速度0.8 m/s | 截割速度0.8 m/s | 截割速度0.8 m/s | 截割速度0.6 m/s | 截割速度1 m/s |
|---|
| 截割深度10 mm | 截割深度20 mm | 截割深度30 mm | 截割深度20 mm | 截割深度20 mm |
|---|
| 0.194 8 | 0.245 5 | 0.281 7 | 0.240 5 | 0.258 6 |
), ArticleFig(id=1322164701706961412, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=EN, label=Table 3, caption=
Mechanical testing conditions of ore body cutting and crushing
, figureFileSmall=null, figureFileBig=null, tableContent=
| 工况 | 截割深度/m | 截割速度/(m/s) | 滚筒转速/(r/min) | 有无激振 | 齿数 |
|---|
| 工况 1 | 0.01,0.02,0.03 | 0.075 | 45 | 无 | 单齿、全齿 |
| 工况 2 | 0.02 | 0.05,0.075,0.1 | 45 | 无 | 单齿 |
| 工况 3 | 0.02,0.03 | 0.075 | 45 | 有 | 全齿 |
), ArticleFig(id=1322164701795041797, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=CN, label=表3, caption=
矿体截割破碎力学测试试验工况
, figureFileSmall=null, figureFileBig=null, tableContent=
| 工况 | 截割深度/m | 截割速度/(m/s) | 滚筒转速/(r/min) | 有无激振 | 齿数 |
|---|
| 工况 1 | 0.01,0.02,0.03 | 0.075 | 45 | 无 | 单齿、全齿 |
| 工况 2 | 0.02 | 0.05,0.075,0.1 | 45 | 无 | 单齿 |
| 工况 3 | 0.02,0.03 | 0.075 | 45 | 有 | 全齿 |
), ArticleFig(id=1322164701895705094, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=EN, label=Table 4, caption=
Average drive motor hydraulic pressure and load fluctuation coefficient with and without vibration excitation at different cutting depths
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| 序号 | 截割深度/m | 有无激振 | 平均驱动马达液压压力/MPa | 载荷波动系数 |
|---|
| 1 | 0.02 | 无 | 10.58 | 0.259 1 |
| 2 | 0.02 | 有 | 9.21 | 0.275 3 |
| 3 | 0.03 | 无 | 14.29 | 0.296 7 |
| 4 | 0.03 | 有 | 13.07 | 0.346 2 |
), ArticleFig(id=1322164701992174087, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164686452277628, language=CN, label=表4, caption=
不同截割深度下有无激振的平均驱动马达液压压力及载荷波动系数
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| 序号 | 截割深度/m | 有无激振 | 平均驱动马达液压压力/MPa | 载荷波动系数 |
|---|
| 1 | 0.02 | 无 | 10.58 | 0.259 1 |
| 2 | 0.02 | 有 | 9.21 | 0.275 3 |
| 3 | 0.03 | 无 | 14.29 | 0.296 7 |
| 4 | 0.03 | 有 | 13.07 | 0.346 2 |
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