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The tension string system with concentrated viscous damping belongs to a hybrid dynamic system in mechanical models. Approximate methods are typically used to solve its inherent problems for engineering applications. In order to further clarify the vibration characteristics of the system, two centrally damped symmetrical damping string systems were taken as the basic research object, and their complex eigenvalues were solved analytically. The complex frequency equation and the eigenvalue expression of the system were derived, and the transformation of the complex frequency equation beyond the function form was treated as algebraic form, and the explicit solution of the complex eigenvalue of the system was given by the algebraic equation. The structure and properties of the complex eigenvalues of the system were analyzed, and the variation of vibration characteristics with damping coefficient was discussed. The results show that the eigenvalue solution of the system can be divided into three branches, in which the real part of the eigenvalue(the inverse is the decay rate) does not change with the order of the system motion, but the imaginary part of the eigenvalue(the frequency) increases with the order of the motion. The decay rate curves corresponding to each solution branch increase first and then decrease with the damping coefficient, and in the damping range of the decay rate curve, the frequencies of each order of the system are equal.
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郑罡(1972—),男,汉族,四川宜宾人,博士,研究员,博士研究生导师。研究方向:斜拉索振动控制、桥梁抗震设计及结构健康监测。E-mail:zhenggang@cqjtu.edu.cn。
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郑罡(1972—),男,汉族,四川宜宾人,博士,研究员,博士研究生导师。研究方向:斜拉索振动控制、桥梁抗震设计及结构健康监测。E-mail:zhenggang@cqjtu.edu.cn。
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Relationship curve between attenuation rate and damping, figureFileSmall=bE7P18US948cJy/GFhMZ5g==, figureFileBig=tboZn0ctafFgGwEWD1Fhfw==, tableContent=null), ArticleFig(id=1205909519658447382, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156908300135650039, language=CN, label=图2, caption=
衰减率随阻尼变化曲线, figureFileSmall=bE7P18US948cJy/GFhMZ5g==, figureFileBig=tboZn0ctafFgGwEWD1Fhfw==, tableContent=null), ArticleFig(id=1205909519733944855, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156908300135650039, language=EN, label=Fig.3, caption=
Relationship curve between frequency and damping, figureFileSmall=Z0O1boOWkScKkzQn+0HuPg==, figureFileBig=6PyyroW/lrpJsQ7NtgpXnA==, tableContent=null), ArticleFig(id=1205909519796859416, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156908300135650039, language=CN, label=图3, caption=
频率随阻尼变化曲线, figureFileSmall=Z0O1boOWkScKkzQn+0HuPg==, figureFileBig=6PyyroW/lrpJsQ7NtgpXnA==, tableContent=null), ArticleFig(id=1205909519876551193, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156908300135650039, language=EN, label=Fig.4, caption=
Relationship curve between damping ratio and damping, figureFileSmall=teZycd+DsM1E++oqJzJN7A==, figureFileBig=oolCMGcoS8aGgtDHWfwWJQ==, tableContent=null), ArticleFig(id=1205909519935271450, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156908300135650039, language=CN, label=图4, caption=
阻尼比随阻尼变化曲线, figureFileSmall=teZycd+DsM1E++oqJzJN7A==, figureFileBig=oolCMGcoS8aGgtDHWfwWJQ==, tableContent=null), ArticleFig(id=1205909519998186011, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156908300135650039, language=EN, label=Fig.5, caption=
The 1st order eigenfunction of the system for c<2, figureFileSmall=8Dfa/XgbARpuXol5mNt45g==, figureFileBig=VPQK88nXkCEWw020oDsjGA==, tableContent=null), ArticleFig(id=1205909520061100572, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156908300135650039, language=CN, label=图5, caption=
当c<2时系统的一阶本征函数, figureFileSmall=8Dfa/XgbARpuXol5mNt45g==, figureFileBig=VPQK88nXkCEWw020oDsjGA==, tableContent=null), ArticleFig(id=1205909520128209437, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156908300135650039, language=EN, label=Fig.6, caption=
The 1st order eigenfunction of the system for c>2, figureFileSmall=8IRf7OjqNvzDFh3wy/u5Kg==, figureFileBig=8aE8xCg2vfN3kNuvqjWdCA==, tableContent=null), ArticleFig(id=1205909520195318302, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156908300135650039, language=CN, label=图6, caption=
当c>2时系统的一阶本征函数, figureFileSmall=8IRf7OjqNvzDFh3wy/u5Kg==, figureFileBig=8aE8xCg2vfN3kNuvqjWdCA==, tableContent=null), ArticleFig(id=1205909520258232865, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156908300135650039, language=EN, label=Table 1, caption=
Eigenvalues of symmetric double concentrated damped string system with four spans
, figureFileSmall=null, figureFileBig=null, tableContent=
| 阶次 | 本征值 | 衰减率 | 频率 |
| 1 | -1.098 6±3.141 5i | 1.098 6 | π |
| 2 | -2.197 2±6.283 1i | 2.197 2 | 2π |
| 3 | -1.098 6±9.424 7i | 1.098 6 | 3π |
| 4 | -1.098 6±15.707 9i | 1.098 6 | 5π |
| 5 | -2.197 2±18.849 5i | 2.197 2 | 6π |
| 6 | -1.098 6±21.991 1i | 1.098 6 | 7π |
| 7 | -1.098 6±28.274 3i | 1.098 6 | 9π |
| 8 | -2.197 2±31.415 9i | 2.197 2 | 10π |
| 9 | -1.098 6±34.557 5i | 1.098 6 | 11π |
), ArticleFig(id=1205909520325341731, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156908300135650039, language=CN, label=表1, caption=
四分跨对称双集中阻尼弦系统的本征值
, figureFileSmall=null, figureFileBig=null, tableContent=
| 阶次 | 本征值 | 衰减率 | 频率 |
| 1 | -1.098 6±3.141 5i | 1.098 6 | π |
| 2 | -2.197 2±6.283 1i | 2.197 2 | 2π |
| 3 | -1.098 6±9.424 7i | 1.098 6 | 3π |
| 4 | -1.098 6±15.707 9i | 1.098 6 | 5π |
| 5 | -2.197 2±18.849 5i | 2.197 2 | 6π |
| 6 | -1.098 6±21.991 1i | 1.098 6 | 7π |
| 7 | -1.098 6±28.274 3i | 1.098 6 | 9π |
| 8 | -2.197 2±31.415 9i | 2.197 2 | 10π |
| 9 | -1.098 6±34.557 5i | 1.098 6 | 11π |
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