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With the continuous development of aerospace industry, the load transfer structure of spacecraft is getting more and more complicated. In practical engineering, how to distribute the loads in a reasonable way is of great significance for the lightweight design of spacecraft and the guarantee of structural load carrying capacity, and it is also necessary to take into account the non-ideal boundary conditions of the overall structure to the local structure in the process of dynamic load transfer structure design. Based on this, this paper proposes a dynamic topology optimization design method for dynamic load transfer structure based on structural boundary condition equivalence, which can fully consider the influence of the overall structure on the local structure while designing the load transfer structure. The method firstly simplifies the connection boundary between the local structure and the overall structure into a spring unit and a centralized mass unit, optimizes the unit parameters through genetic algorithm to achieve the equivalence of boundary conditions, and finally establishes a topology optimization model of the load transfer structure based on the unit density variable in conjunction with the design objective of the dynamic compliance of the structure. Numerical examples verify the effectiveness of the new method and obtain the optimization design results with the variation of volume fraction, external load frequency and load constraint interval.
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随着航空航天事业的不断发展,飞行器的载荷传递结构也愈来愈复杂。在实际工程中,如何将载荷通过合理的方式进行分配,对于航天器的轻量化设计以及结构承载性的保证具有重要的意义,并且在动载荷传递结构设计的过程中还需要考虑整体结构对局部结构的非理想边界条件。基于此,本文提出了一种基于结构边界条件等效的动载荷传递结构动力学拓扑优化设计方法,可在设计载荷传递结构的同时充分考虑整体结构对局部结构的影响。该方法将局部结构与整体结构之间的连接边界简化为弹簧单元与集中质量单元,通过遗传算法对单元参数进行优化从而实现边界条件等效,结合结构动柔度设计目标建立基于单元密度变量的载荷传递结构拓扑优化模型。数值算例验证了该方法的有效性,并得到了优化设计结果随体积分数、外载荷频率以及载荷约束区间变化的规律。
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Flow chart of equivalent boundary conditions method, figureFileSmall=nGL3QDtln7CQtLUBXIFbOA==, figureFileBig=ptfLa4YKEOCqyZNu5wWEBQ==, tableContent=null), ArticleFig(id=1227653078304883532, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=图1, caption=
边界条件等效方法流程图, figureFileSmall=nGL3QDtln7CQtLUBXIFbOA==, figureFileBig=ptfLa4YKEOCqyZNu5wWEBQ==, tableContent=null), ArticleFig(id=1227653078430712658, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=EN, label=Fig. 2, caption=
Comparison of SIMP and RAMP, figureFileSmall=NObBIwl1klpIEfLhoW9Aiw==, figureFileBig=7ZpDCvR8eMp9zhQOSIEIQA==, tableContent=null), ArticleFig(id=1227653078548153173, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=图2, caption=
SIMP与RAMP的对比, figureFileSmall=NObBIwl1klpIEfLhoW9Aiw==, figureFileBig=7ZpDCvR8eMp9zhQOSIEIQA==, tableContent=null), ArticleFig(id=1227653078678176606, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=EN, label=Fig. 3, caption=
Schematic diagram of elastic substrate, figureFileSmall=0Qbwj3i0A3kFXG8tQHyK8w==, figureFileBig=4mOezSgWRlr/1bxF5iI4cg==, tableContent=null), ArticleFig(id=1227653078816588646, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=图3, caption=
弹性基板示意图, figureFileSmall=0Qbwj3i0A3kFXG8tQHyK8w==, figureFileBig=4mOezSgWRlr/1bxF5iI4cg==, tableContent=null), ArticleFig(id=1227653078946612078, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=EN, label=Fig. 4, caption=
Schematic diagram of equivalent boundary conditions, figureFileSmall=arUNw0biu5mLrKRlT1eY6g==, figureFileBig=o9yDy8Nc8hyyTed68CWyxg==, tableContent=null), ArticleFig(id=1227653080301372279, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=图4, caption=
边界条件等效示意图, figureFileSmall=arUNw0biu5mLrKRlT1eY6g==, figureFileBig=o9yDy8Nc8hyyTed68CWyxg==, tableContent=null), ArticleFig(id=1227653080448172926, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=EN, label=Fig. 5, caption=
Pareto solution sets for multi-objective optimization problem, figureFileSmall=YI9+wU08CYJ7W5VV65dZAA==, figureFileBig=fhQUg+aDaZOQHe3ajjRauQ==, tableContent=null), ArticleFig(id=1227653080561419144, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=图5, caption=
多目标优化问题Pareto解集, figureFileSmall=YI9+wU08CYJ7W5VV65dZAA==, figureFileBig=fhQUg+aDaZOQHe3ajjRauQ==, tableContent=null), ArticleFig(id=1227653080678859667, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=EN, label=Fig. 6, caption=
Optimization results, figureFileSmall=qmMWwMoUTYOxk6gdxvXA3A==, figureFileBig=K2ZB6YfS9KZLBLoy4hKkgQ==, tableContent=null), ArticleFig(id=1227653080762745756, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=图6, caption=
优化结果, figureFileSmall=qmMWwMoUTYOxk6gdxvXA3A==, figureFileBig=K2ZB6YfS9KZLBLoy4hKkgQ==, tableContent=null), ArticleFig(id=1227653080867603366, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=EN, label=Fig. 7, caption=
Variation of objective function, figureFileSmall=R28sRk2/FZK8zNBoUsvRXg==, figureFileBig=n/4OI/m0OdFDO7MA+Nadtg==, tableContent=null), ArticleFig(id=1227653080964072360, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=图7, caption=
目标函数变化, figureFileSmall=R28sRk2/FZK8zNBoUsvRXg==, figureFileBig=n/4OI/m0OdFDO7MA+Nadtg==, tableContent=null), ArticleFig(id=1227653081098290099, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=EN, label=Fig. 8, caption=
Schematic diagram of L-shape plate, figureFileSmall=Zc6l/JeBCUxqfj8/HmodPQ==, figureFileBig=QEIZ1n0eChVvXhVCWu1qcQ==, tableContent=null), ArticleFig(id=1227653081228313528, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=图8, caption=
L形板示意图, figureFileSmall=Zc6l/JeBCUxqfj8/HmodPQ==, figureFileBig=QEIZ1n0eChVvXhVCWu1qcQ==, tableContent=null), ArticleFig(id=1227653081341559745, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=EN, label=Fig. 9, caption=
Schematic diagram of equivalent boundary conditions, figureFileSmall=QJOfyOEAJJQc+0DWdU5SMw==, figureFileBig=m5RizSp4GCfJeWx7FmGeMw==, tableContent=null), ArticleFig(id=1227653081446417353, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=图9, caption=
边界条件等效示意图, figureFileSmall=QJOfyOEAJJQc+0DWdU5SMw==, figureFileBig=m5RizSp4GCfJeWx7FmGeMw==, tableContent=null), ArticleFig(id=1227653081580635088, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=EN, label=Fig. 10, caption=
Pareto solution sets for multi-objective optimization problem, figureFileSmall=Qlo3ZunVt4Qwm4rZVktvZg==, figureFileBig=b8yQYN2P3t2Nc6EBEtLFBA==, tableContent=null), ArticleFig(id=1227653081702269913, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=图10, caption=
多目标优化问题Pareto解集, figureFileSmall=Qlo3ZunVt4Qwm4rZVktvZg==, figureFileBig=b8yQYN2P3t2Nc6EBEtLFBA==, tableContent=null), ArticleFig(id=1227653081802933216, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=EN, label=Fig. 11, caption=
Optimization results, figureFileSmall=zr8TgjIlX5gWtDzyZNm6wQ==, figureFileBig=yl/0EDNl2UZfdrDbWhqWTA==, tableContent=null), ArticleFig(id=1227653081899402212, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=图11, caption=
优化结果, figureFileSmall=zr8TgjIlX5gWtDzyZNm6wQ==, figureFileBig=yl/0EDNl2UZfdrDbWhqWTA==, tableContent=null), ArticleFig(id=1227653082008454122, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=EN, label=Fig. 12, caption=
Variation of objective function, figureFileSmall=scIKYo+lfvvf1mUEfp0VGA==, figureFileBig=+raASJOKXHa2sdc8adp2OA==, tableContent=null), ArticleFig(id=1227653082096534511, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=图12, caption=
目标函数变化, figureFileSmall=scIKYo+lfvvf1mUEfp0VGA==, figureFileBig=+raASJOKXHa2sdc8adp2OA==, tableContent=null), ArticleFig(id=1227653082197197810, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=EN, label=Fig. 13, caption=
Schematic diagram of the cabin section structure, figureFileSmall=YeUM1PftZoUH5R1AUThoog==, figureFileBig=OeNmvHk7X7y+CyclxcP6UQ==, tableContent=null), ArticleFig(id=1227653082356581373, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=图13, caption=
舱段结构示意图, figureFileSmall=YeUM1PftZoUH5R1AUThoog==, figureFileBig=OeNmvHk7X7y+CyclxcP6UQ==, tableContent=null), ArticleFig(id=1227653082532741123, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=EN, label=Fig. 14, caption=
Schematic diagram of equivalent boundary conditions, figureFileSmall=KBq84HJU78YjZwEVh9uwwA==, figureFileBig=+Rpgeq2Pord83SLKMq7VFg==, tableContent=null), ArticleFig(id=1227653082612432904, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=图14, caption=
边界条件等效示意图, figureFileSmall=KBq84HJU78YjZwEVh9uwwA==, figureFileBig=+Rpgeq2Pord83SLKMq7VFg==, tableContent=null), ArticleFig(id=1227653082704707597, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=EN, label=Fig. 15, caption=
Pareto solution sets for multi-objective optimization problem, figureFileSmall=XITfOeU+z2YA4cQXe+xc0g==, figureFileBig=o3hEWs4nrULIXj70egXhCg==, tableContent=null), ArticleFig(id=1227653082796982289, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=图15, caption=
多目标优化问题Pareto解集, figureFileSmall=XITfOeU+z2YA4cQXe+xc0g==, figureFileBig=o3hEWs4nrULIXj70egXhCg==, tableContent=null), ArticleFig(id=1227653083010891807, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=EN, label=Fig. 16, caption=
Optimization results, figureFileSmall=1RxBFEK98y3rJqyFaOr/Hg==, figureFileBig=kVxEmEBPGQX9MeZ4BsbEAg==, tableContent=null), ArticleFig(id=1227653083098972197, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=图16, caption=
优化结果, figureFileSmall=1RxBFEK98y3rJqyFaOr/Hg==, figureFileBig=kVxEmEBPGQX9MeZ4BsbEAg==, tableContent=null), ArticleFig(id=1227653083187052584, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=EN, label=Fig. 17, caption=
Variation of objective function, figureFileSmall=/a0TaN8f4mRv5uGhTpuwyw==, figureFileBig=Y70Y9s1+6t35erAAKSwfDA==, tableContent=null), ArticleFig(id=1227653083279327277, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=图17, caption=
目标函数变化, figureFileSmall=/a0TaN8f4mRv5uGhTpuwyw==, figureFileBig=Y70Y9s1+6t35erAAKSwfDA==, tableContent=null), ArticleFig(id=1227653083371601970, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=EN, label=Tab. 1, caption=
The first three order natural frequencies of global structure and local structure
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| 固有频率阶数 | 整体结构固有频率/Hz | 局部结构固有频率/Hz |
|---|
| 1阶 | 189.46 | 920.26 |
| 2阶 | 489.55 | 1710.67 |
| 3阶 | 608.45 | 1894.91 |
), ArticleFig(id=1227653084726362163, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=表1, caption=
整体结构与局部结构前3阶固有频率
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| 固有频率阶数 | 整体结构固有频率/Hz | 局部结构固有频率/Hz |
|---|
| 1阶 | 189.46 | 920.26 |
| 2阶 | 489.55 | 1710.67 |
| 3阶 | 608.45 | 1894.91 |
), ArticleFig(id=1227653084827025463, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=EN, label=Tab. 2, caption=
Relative errors of natural frequencies and MAC values of main modes
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| 固有频率与主振型阶数 | 固有频率相对误差 | 主振型MAC值 |
|---|
| 1阶 | 5.86% | 0.98 |
| 2阶 | 2.42% | 1.00 |
| 3阶 | 4.62% | 0.97 |
), ArticleFig(id=1227653084940271675, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=表2, caption=
固有频率相对误差及主振型MAC值
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| 固有频率与主振型阶数 | 固有频率相对误差 | 主振型MAC值 |
|---|
| 1阶 | 5.86% | 0.98 |
| 2阶 | 2.42% | 1.00 |
| 3阶 | 4.62% | 0.97 |
), ArticleFig(id=1227653085007380542, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=EN, label=Tab. 3, caption=
Comparison of optimization results among global structure, local structure under ideal fixed support boundary conditions and local structure after boundary condition equivalence
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| 结构特性 | 整体结构 | 理想固支边界条件 | 边界条件等效 |
|---|
| 动柔度模值/J | 23.14×10−6 | 23.06×10−6 | 24.29×10−6 |
| 初始结构基频/Hz | 334.93 | 715.74 | 365.58 |
| 优化结构基频/Hz | 252.66 | 785.10 | 260.35 |
| 优化结果 |  |  |  |
), ArticleFig(id=1227653085103849537, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=表3, caption=
整体结构、理想固支边界条件下的局部结构和边界条件等效后的局部结构优化结果对比
, figureFileSmall=null, figureFileBig=null, tableContent=
| 结构特性 | 整体结构 | 理想固支边界条件 | 边界条件等效 |
|---|
| 动柔度模值/J | 23.14×10−6 | 23.06×10−6 | 24.29×10−6 |
| 初始结构基频/Hz | 334.93 | 715.74 | 365.58 |
| 优化结构基频/Hz | 252.66 | 785.10 | 260.35 |
| 优化结果 |  |  |  |
), ArticleFig(id=1227653085208707141, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=EN, label=Tab. 4, caption=
Comparison of optimization results between global structure and local structure after boundary condition equivalence under different volume fractions
, figureFileSmall=null, figureFileBig=null, tableContent=
| 体积分数 | 整体结构优化后基频/Hz | 整体结构优化结果 | 局部结构优化后基频/Hz | 局部结构优化结果 |
|---|
| 30% | 279.94 |  | 271.75 |  |
| 40% | 265.79 |  | 261.54 |  |
| 50% | 252.66 |  | 260.35 |  |
| 60% | 241.24 |  | 252.04 |  |
| 70% | 230.00 |  | 238.48 |  |
), ArticleFig(id=1227653085338730568, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=表4, caption=
不同体积分数下整体结构和边界条件等效后的局部结构优化结果对比
, figureFileSmall=null, figureFileBig=null, tableContent=
| 体积分数 | 整体结构优化后基频/Hz | 整体结构优化结果 | 局部结构优化后基频/Hz | 局部结构优化结果 |
|---|
| 30% | 279.94 |  | 271.75 |  |
| 40% | 265.79 |  | 261.54 |  |
| 50% | 252.66 |  | 260.35 |  |
| 60% | 241.24 |  | 252.04 |  |
| 70% | 230.00 |  | 238.48 |  |
), ArticleFig(id=1227653085418422347, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=EN, label=Tab. 5, caption=
Comparison of optimization results under different volume fractions
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| 体积分数 | 动柔度模值/J | 优化结果 |
|---|
| 40% | 37.05×10−6 |  |
| 50% | 34.99×10−6 |  |
| 60% | 33.59×10−6 |  |
| 70% | 32.56×10−6 |  |
), ArticleFig(id=1227653085519085647, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=表5, caption=
不同体积分数比下的优化结果对比
, figureFileSmall=null, figureFileBig=null, tableContent=
| 体积分数 | 动柔度模值/J | 优化结果 |
|---|
| 40% | 37.05×10−6 |  |
| 50% | 34.99×10−6 |  |
| 60% | 33.59×10−6 |  |
| 70% | 32.56×10−6 |  |
), ArticleFig(id=1227653085649109073, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=EN, label=Tab. 6, caption=
Comparison of optimization results under different external load frequencies
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| 外载荷频率/Hz | 动柔度模值/J | 优化结果 |
|---|
| 20 | 34.91×10−6 |  |
| 50 | 34.99×10−6 |  |
| 100 | 35.34×10−6 |  |
| 200 | 36.78×10−6 |  |
), ArticleFig(id=1227653085829464146, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=表6, caption=
不同外载荷频率下的优化结果对比
, figureFileSmall=null, figureFileBig=null, tableContent=
| 外载荷频率/Hz | 动柔度模值/J | 优化结果 |
|---|
| 20 | 34.91×10−6 |  |
| 50 | 34.99×10−6 |  |
| 100 | 35.34×10−6 |  |
| 200 | 36.78×10−6 |  |
), ArticleFig(id=1227653085938516053, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=EN, label=Tab. 7, caption=
Comparison of optimization results under the relative widths of different constraint intervals
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| 约束区间相对宽度 | 输出载荷/mN | A:B | 动柔度模值/J | 优化结果 |
|---|
| A | B |
|---|
| 1% | 2596.06 | 1310.66 | 1.98 | 35.27×10−6 |  |
| 5% | 2407.58 | 1261.23 | 1.91 | 34.95×10−6 |  |
| 10% | 2393.62 | 1325.88 | 1.81 | 34.99×10−6 |  |
| 20% | 2382.02 | 1487.57 | 1.60 | 34.78×10−6 |  |
), ArticleFig(id=1227653086022402135, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=表7, caption=
不同约束区间相对宽度下的优化结果对比
, figureFileSmall=null, figureFileBig=null, tableContent=
| 约束区间相对宽度 | 输出载荷/mN | A:B | 动柔度模值/J | 优化结果 |
|---|
| A | B |
|---|
| 1% | 2596.06 | 1310.66 | 1.98 | 35.27×10−6 |  |
| 5% | 2407.58 | 1261.23 | 1.91 | 34.95×10−6 |  |
| 10% | 2393.62 | 1325.88 | 1.81 | 34.99×10−6 |  |
| 20% | 2382.02 | 1487.57 | 1.60 | 34.78×10−6 |  |
), ArticleFig(id=1227653086110482522, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=EN, label=Tab. 8, caption=
Relative errors of natural frequencies and MAC values of main modes
, figureFileSmall=null, figureFileBig=null, tableContent=
| 固有频率与主振型阶数 | 固有频率相对误差 | 主振型MAC值 |
|---|
| 1阶 | 0.18% | 0.99 |
| 2阶 | 13.55% | 0.64 |
), ArticleFig(id=1227653086232117339, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=表8, caption=
固有频率相对误差及主振型MAC值
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| 固有频率与主振型阶数 | 固有频率相对误差 | 主振型MAC值 |
|---|
| 1阶 | 0.18% | 0.99 |
| 2阶 | 13.55% | 0.64 |
), ArticleFig(id=1227653086311809118, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=EN, label=Tab. 9, caption=
Relative errors of natural frequencies and MAC values of main modes
, figureFileSmall=null, figureFileBig=null, tableContent=
| 固有频率与主振型阶数 | 固有频率相对误差 | 主振型MAC值 |
|---|
| 1阶 | 4.6% | 0.98 |
| 2阶 | 10% | 0.98 |
), ArticleFig(id=1227653086408278113, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591808662827616, language=CN, label=表9, caption=
固有频率相对误差及主振型MAC值
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| 固有频率与主振型阶数 | 固有频率相对误差 | 主振型MAC值 |
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| 1阶 | 4.6% | 0.98 |
| 2阶 | 10% | 0.98 |
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