Article(id=1263881612371026693, tenantId=1146029695717560320, journalId=1263187878914834467, issueId=1263881604263437054, articleNumber=null, orderNo=null, doi=10.16578/j.issn.1004.2539.2026.01.016, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1744300800000, receivedDateStr=2025-04-11, revisedDate=1748016000000, revisedDateStr=2025-05-24, acceptedDate=null, acceptedDateStr=null, onlineDate=1779262458173, onlineDateStr=2026-05-20, pubDate=1768406400000, pubDateStr=2026-01-15, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1779262458173, onlineIssueDateStr=2026-05-20, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1779262458173, creator=13041195026, updateTime=1779262458173, updator=13041195026, issue=Issue{id=1263881604263437054, tenantId=1146029695717560320, journalId=1263187878914834467, year='2026', volume='50', issue='1', pageStart='1', pageEnd='191', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1779262456241, creator=13041195026, updateTime=1779263107607, updator=13041195026, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1263884336399528882, tenantId=1146029695717560320, journalId=1263187878914834467, issueId=1263881604263437054, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1263884336403723187, tenantId=1146029695717560320, journalId=1263187878914834467, issueId=1263881604263437054, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=126, endPage=132, ext={EN=ArticleExt(id=1263881614086497037, articleId=1263881612371026693, tenantId=1146029695717560320, journalId=1263187878914834467, language=EN, title=Two-stage amplification mechanism based on flexible hinges, columnId=1263881613436379916, journalTitle=Journal of Mechanical Transmission, columnName=Design·Calculation, runingTitle=null, highlight=null, articleAbstract=
Objective

A novel two-stage compound amplification mechanism design scheme was proposed to address the friction and clearance issues inherent in traditional revolute pairs within the large stroke design of micro-displacement platforms. The aim was to achieve high-precision and significant stroke displacement amplification through structural innovation.

Methods

Utilizing the theory of material mechanics, a static model was established. A two-stage compound amplification structure that integrated a flexible hinge lever amplification mechanism with a bridge amplification mechanism was employed. Piezoelectric ceramics served as the driving source, and a parameter optimization model was developed using Matlab software. The impact of key structural parameters on both the amplification ratio and input stiffness was systematically analyzed to identify the optimal parameter combination. The optimized structure underwent validation through multi-physical field simulation via finite element analysis.

Results

Following optimization, the mechanism attains an impressive displacement amplification ratio of 13.1 times, with its natural frequency reaching 92.2 Hz. The maximum discrepancies between theoretical calculations and simulation results of the amplification ratio and natural frequency are recorded at 2.4% and 3.5%, respectively, thereby demonstrating the feasibility of this structural design.

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目的

为解决微位移平台大行程设计中传统转动副存在的摩擦与间隙问题,提出一种新型二级复合放大机构设计方案,旨在通过结构创新实现高精度、大行程的位移放大效果。

方法

基于材料力学理论建立静力学模型;采用柔性铰链杠杆放大机构与桥式放大机构相结合的二级放大结构,以压电陶瓷为驱动源,通过Matlab软件建立参数优化模型;系统分析关键结构参数对放大比例和输入刚度的影响规律,确定最优参数组合;采用有限元分析方法对优化后的结构进行多物理场仿真验证。

结果

优化后,机构实现了13.1倍位移放大比例,固有频率达92.2 Hz;放大比例、固有频率的理论计算与仿真结果的最大误差分别为2.4%、3.5%,证明了结构的可行性。

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张士军,男,1971年生,山东惠民人,博士,教授;硕士研究生导师;主要研究方向为微位移技术;
, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=iMAW778hemFxfZtrkURwQw==, magXml=LBTzKApyyYspg5E42dc+Dg==, pdfUrl=null, pdf=ykP04W0fZC5R/0H7gy8Iuw==, pdfFileSize=8922618, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=CCBNWiriK277se3GLxN9Gw==, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=UMU777K3ysERoCH8YQNOkQ==, mapNumber=null, authorCompany=null, fund=null, authors=

王学成,男,2001年生,山东高唐人,硕士研究生;主要研究方向为微位移技术;

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Mechanical Systems and Signal Processing2020136:106473., articleTitle=A novel amplification ratio model of a decoupled XY precision positioning stage combined with elastic beam theory and Castigliano’s second theorem considering the exact loading force, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1263881628502319981, tenantId=1146029695717560320, journalId=1263187878914834467, articleId=1263881612371026693, xref=null, ext=[AuthorCompanyExt(id=1263881628548457326, tenantId=1146029695717560320, journalId=1263187878914834467, articleId=1263881612371026693, companyId=1263881628502319981, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=School of Mechanical and Electrical Engineering, Shandong Jianzhu University, Jinan250101, China), AuthorCompanyExt(id=1263881628670092144, tenantId=1146029695717560320, journalId=1263187878914834467, articleId=1263881612371026693, companyId=1263881628502319981, language=CN, 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articleId=1263881612371026693, language=CN, label=图10, caption=二级放大机构1阶模态, figureFileSmall=khBn8QyH7U2VhEI47NXuzg==, figureFileBig=qNz5c2eb/hdwRcR25uSCWQ==, tableContent=null), ArticleFig(id=1263881662572650624, tenantId=1146029695717560320, journalId=1263187878914834467, articleId=1263881612371026693, language=EN, label=Tab. 1, caption=

Parameters before and after optimization

, figureFileSmall=null, figureFileBig=null, tableContent=
rtb l1 l2 l3 l4
优化前30.52034.5343.540.5
优化后30.56302.13936
), ArticleFig(id=1263881663008858244, tenantId=1146029695717560320, journalId=1263187878914834467, articleId=1263881612371026693, language=CN, label=表1, caption=

优化前后参数

, figureFileSmall=null, figureFileBig=null, tableContent=
rtb l1 l2 l3 l4
优化前30.52034.5343.540.5
优化后30.56302.13936
), ArticleFig(id=1263881663721889930, tenantId=1146029695717560320, journalId=1263187878914834467, articleId=1263881612371026693, language=EN, label=Tab. 2, caption=

Physical parameters of 7075Al

, figureFileSmall=null, figureFileBig=null, tableContent=
弹性模量/GPa屈服强度/MPa泊松比密度/(kg/m3
71.75030.332 810
), ArticleFig(id=1263881665412194449, tenantId=1146029695717560320, journalId=1263187878914834467, articleId=1263881612371026693, language=CN, label=表2, caption=

7075Al物理参数

, figureFileSmall=null, figureFileBig=null, tableContent=
弹性模量/GPa屈服强度/MPa泊松比密度/(kg/m3
71.75030.332 810
), ArticleFig(id=1263881666246860953, tenantId=1146029695717560320, journalId=1263187878914834467, articleId=1263881612371026693, language=EN, label=Tab. 3, caption=

Specific values before and after amplification

, figureFileSmall=null, figureFileBig=null, tableContent=
参数优化前优化后
理论计算仿真误差/%理论计算仿真误差/%
放大比例11.110.82.713.112.82.4
参数优化前优化后

理论计

算/MPa

仿真/MPa误差/%

理论计

算/MPa

仿真/MPa误差/%
最大应力50.447.36.551.955.16.5
参数优化前优化后

理论计

算/Hz

仿真/Hz误差/%

理论计

算/Hz

仿真/Hz误差/%
固有频率96.091.74.795.492.23.5
), ArticleFig(id=1263881667496763553, tenantId=1146029695717560320, journalId=1263187878914834467, articleId=1263881612371026693, language=CN, label=表3, caption=

放大前后具体数值

, figureFileSmall=null, figureFileBig=null, tableContent=
参数优化前优化后
理论计算仿真误差/%理论计算仿真误差/%
放大比例11.110.82.713.112.82.4
参数优化前优化后

理论计

算/MPa

仿真/MPa误差/%

理论计

算/MPa

仿真/MPa误差/%
最大应力50.447.36.551.955.16.5
参数优化前优化后

理论计

算/Hz

仿真/Hz误差/%

理论计

算/Hz

仿真/Hz误差/%
固有频率96.091.74.795.492.23.5
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基于柔性铰链的二级放大机构
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王学成 , 张士军 , 崔禧龙
机械传动 | 设计计算 2026,50(1): 126-132
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机械传动 | 设计计算 2026, 50(1): 126-132
基于柔性铰链的二级放大机构
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王学成 , 张士军 , 崔禧龙
作者信息
  • 山东建筑大学 机电工程学院,济南250101
  • 王学成,男,2001年生,山东高唐人,硕士研究生;主要研究方向为微位移技术;

通讯作者:

张士军,男,1971年生,山东惠民人,博士,教授;硕士研究生导师;主要研究方向为微位移技术;
Two-stage amplification mechanism based on flexible hinges
Xuecheng WANG , Shijun ZHANG , Xilong CUI
Affiliations
  • School of Mechanical and Electrical Engineering, Shandong Jianzhu University, Jinan250101, China
出版时间: 2026-01-15 doi: 10.16578/j.issn.1004.2539.2026.01.016
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目的

为解决微位移平台大行程设计中传统转动副存在的摩擦与间隙问题,提出一种新型二级复合放大机构设计方案,旨在通过结构创新实现高精度、大行程的位移放大效果。

方法

基于材料力学理论建立静力学模型;采用柔性铰链杠杆放大机构与桥式放大机构相结合的二级放大结构,以压电陶瓷为驱动源,通过Matlab软件建立参数优化模型;系统分析关键结构参数对放大比例和输入刚度的影响规律,确定最优参数组合;采用有限元分析方法对优化后的结构进行多物理场仿真验证。

结果

优化后,机构实现了13.1倍位移放大比例,固有频率达92.2 Hz;放大比例、固有频率的理论计算与仿真结果的最大误差分别为2.4%、3.5%,证明了结构的可行性。

微位移平台  /  柔性铰链  /  二级放大  /  有限元分析
Objective

A novel two-stage compound amplification mechanism design scheme was proposed to address the friction and clearance issues inherent in traditional revolute pairs within the large stroke design of micro-displacement platforms. The aim was to achieve high-precision and significant stroke displacement amplification through structural innovation.

Methods

Utilizing the theory of material mechanics, a static model was established. A two-stage compound amplification structure that integrated a flexible hinge lever amplification mechanism with a bridge amplification mechanism was employed. Piezoelectric ceramics served as the driving source, and a parameter optimization model was developed using Matlab software. The impact of key structural parameters on both the amplification ratio and input stiffness was systematically analyzed to identify the optimal parameter combination. The optimized structure underwent validation through multi-physical field simulation via finite element analysis.

Results

Following optimization, the mechanism attains an impressive displacement amplification ratio of 13.1 times, with its natural frequency reaching 92.2 Hz. The maximum discrepancies between theoretical calculations and simulation results of the amplification ratio and natural frequency are recorded at 2.4% and 3.5%, respectively, thereby demonstrating the feasibility of this structural design.

Micro displacement platform  /  Flexible hinge  /  Two-stage amplification  /  Finite element analysis
王学成, 张士军, 崔禧龙. 基于柔性铰链的二级放大机构. 机械传动, 2026 , 50 (1) : 126 -132 . DOI: 10.16578/j.issn.1004.2539.2026.01.016
Xuecheng WANG, Shijun ZHANG, Xilong CUI. Two-stage amplification mechanism based on flexible hinges[J]. Journal of Mechanical Transmission, 2026 , 50 (1) : 126 -132 . DOI: 10.16578/j.issn.1004.2539.2026.01.016
随着科技的快速发展,微纳米技术在多个领域中得到广泛应用,如半导体制造、生命科学和材料研究等[1-2]。这些领域对微米或纳米级位移的精确控制需求日益增长,因此,微位移平台的研究与开发成为一个重要课题。微位移平台是一种高精度、高稳定性的运动控制设备,能够在微小的位移范围内实现精确定位[3]。但在高精度与大行程方面,如今的微位移平台仍不能满足需求,需要设计一种行程放大机构,从而在确保精度的前提下实现大行程工作范围。
为了实现微位移定位平台高精度和高稳定性的位置定位,其传动系统,即放大机构尤为重要。传统的刚性铰链(如轴承或金属铰链)需依赖固定的转轴或机械连接,存在机械摩擦和间隙等缺点;而柔性铰链则相反,它通过精心设计的结构使材料在受到作用时产生弯曲或变形,从而实现旋转或折叠的功能,其设计依赖于材料的弹性、塑性或可变形特性[4-6]。目前较为常见的放大机构有杠杆式、桥式、SR式、混合式等[7]。这些放大机构具有结构简单、响应速度快、运行稳定、便于加工等特点,但由于其结构简单,放大倍数比较小,不适合大行程范围的应用[8]
KIM等[9]将两个桥式放大机构进行交叉组合,设计出一种空间桥式放大机构,通过建模与实验,其误差低于10%,其放大倍数基本上可达10倍,最大行程为50 μm。吴彤等[10]采用双层桥式机构设计了拱形放大机构,但放大倍数较小,仅为5.5倍,最大行程为60 μm。XU等[11]为提高传统桥式放大机构的侧向刚度,设计了一种复合桥式放大机构,放大比例达到12倍,同时将固有频率提高到74 Hz。LI等[12]将多个杠杆放大机构组合,在理想情况下可以实现较大倍数的位移放大,但其多级组合降低了本身的刚度,并会出现较大的累积误差,最终实际放大倍数仅为7.5。LING等[13]设计了一种两级菱形位移放大机构,利用滑动边界约束将整体的固有频率提高到2.2 kHz,最大行程可达0.06 mm。郝云锋等[14]则利用力学原理设计了多级嵌套菱形放大机构,较多级杠杆提高了一定的刚度,其理论放大比例可达14.5倍,最大工作行程为140 μm,但由于是多级杠杆,负载时的放大比例不能保证。FAN等[15]设计了一种对称差动杠杆放大机构,虽将固有频率提高到了930.58 Hz,但其放大比例仅达到6.5。DONG等[16]将杠杆与桥式机构相结合,设计了一款新型桥式放大机构,放大比例可达15倍,其桥式机构为最终输出机构,结构紧凑,但有制造复杂度高、输入刚度要求更高、动态特性低的缺点。桥式放大机构紧凑,放大性能较好;而杠杆机构结构简单,放大比例具有更好的可控性。因此,本文采用桥式放大机构为一级放大、杠杆放大机构为二级放大机构,使得其结构比较简单,且在动态特性和输入刚度方面可提升50%左右。
本文设计了一种利用压电陶瓷(PZT)驱动,结构紧凑、机构简单、放大比例较大的二级放大机构。对整体结构建模;利用材料力学相关理论,根据柔度矩阵与伪刚体等模型,获得放大比例的计算公式;采用Matlab软件的优化算法,引入约束条件,得出最优结构参数;最后,通过有限元分析对其进行了验证。
二级放大机构由一级桥式放大机构与二级杠杆放大机构串联所得,如图1所示。
图2所示,该机构通过两个压电陶瓷驱动,底部采用螺栓固定;一级传动部分为桥式机构,将输入位移传递到二级杠杆机构,再经过杠杆机构进行二级放大,在杠杆机构末端实现放大位移的输出。该机构结合了桥式放大机构的紧凑性与杠杆机构的稳定性,实现二级放大,提高了整体的放大倍数。该机构采用左右对称设计,可减小输出端y方向的寄生位移,进而提高放大机构在x方向的运动精度。由于桥式放大机构采用双桥臂,在非输出方向的刚度更大,能够更好地抵抗寄生运动等其他因素的干扰;不仅对输出方向影响很小,也提高了输出方向的刚度。
图2中,xinxout分别为机构的输入、输出位移;FinFout分别为机构的输入、输出载荷;b1为放大机构的厚度;m1m2m3m4分别为对应杆件的等效质量。
同时,为了保持机械接触稳定性,提高机械强度与抗疲劳性,在压电陶瓷的底端安装有预紧螺栓。压电陶瓷在交变电场下会反复伸缩,预紧螺栓通过施加恒定的压力,可消除压电陶瓷与相邻部件之间的间隙,防止因振动或冲击导致的接触不良。预紧力还能减少压电陶瓷因形变恢复不完全导致的响应迟滞,提升动态性能。
对于柔性放大机构,最重要的评估性能是其放大倍数。现阶段较为成熟的放大比例计算模型有虚功原理、伪刚体模型、几何分析和柔度矩阵法等。由于本机构是杠杆与桥式机构的组合,为了方便计算,采用几种模型的结合进行理论计算。对于桥式放大机构,利用柔度矩阵与虚功原理;对于杠杆机构,则采用刚体模型与几何分析的方法。由于为对称设计,只考虑一半进行计算。双桥臂机构如图3所示。
图3中,t为柔性铰链厚度;l1为梁结构长度;r为圆形柔性铰链的半径;θ为两铰链夹角;l2为两铰链高度差;d1为连接梁的宽度。
用柔度矩阵法中平移矩阵和旋转矩阵求解双链桥式放大结构,可能出现计算复杂、过程烦琐、求解困难等问题。为了更好地进行参数优化,将上下直圆柔性铰链模型简化成水平直圆柔性铰链模型,使等效后放大机构的厚度b=2b1,在确保后期仿真结果具有足够准确性的前提下,简化了计算。
根据卡氏第二定律,桥式位移放大机构复合柔性铰链的柔度方程为
T=CW=c1000c2c30c3c4W
式中,C为柔度矩阵;W为广义力,W=[FyFzFx]T为变形量,T=[ΔyΔzΔx]
对于直圆柔性铰链[17],有
c1=1Eb[π(rt)12-π2]
c2=9πr5/22Ebt5/2+3πr3/22Ebt3/2
c3=9πr3/22Ebt5/2
c4=9πr1/22Ebt5/2
式中,E为材料的弹性模量。
根据文献[18]可得,桥式放大机构输入位移xin与输出位移xout的关系为
xin1/2xout1/2=C11C12C21C22FinFout1
式中C11C12C21C22均为柔度矩阵中的元素,具体表达式如下:
C11=c1+c4l224=1Eb[π(rt)12-π2]+9πr1/2l228Ebt5/2
C12=c3l22-c4l1l24=9πr3/2l24Ebt5/2-9πr1/2l1l28Ebt5/2
C21=c3l22+c4l1l24=9πr3/2l24Ebt5/2+9πr1/2l1l28Ebt5/2
C22=c2-c4l124=9πr5/22Ebt5/2+3πr3/22Ebt3/2-9πr1/2l128Ebt5/2
根据式(6),当Fout=0时,双链桥式放大机构的放大倍数为
R1=xout1xin1=C21C11
此时,输入刚度为
Kin=Finxin1=12C11
xin=0时,输出刚度为
Kout=Foutxout1=14(C11C22-C12C21)
对于杠杆机构,采用伪刚体模型理论进行建模,可有效反映其放大效果,如图4所示。
根据几何关系,杠杆机构的放大比例为
R2=xoutxin2=l3+l4l3 
其中xin2=xout1
结合双链桥式机构与杠杆机构,整体的放大比例为
R=R1R2
对于整体的动力学分析,由于结构只存在y向的确定运动,所以,可以当作1个自由度输出来进行分析。取输入、输出位移为广义坐标:xq=xinxout;此时整体的机构动能可用广义坐标表示。m1m3整体做平动,m2m4既做平动也做转动。由此可以得到,整体的动能为
T=212m1[xin22+xout122]+412m2[(xin4)2+(xout14)2]+412m2[(xin4)2+(3xout14)2]+811212m2l22α12+12m3xout12+211212m4l32α22+212m4xout12+14xout2
式中,α1m1的转角,α1sin α1=xout12/l1α2m2的转角,α2sin α2=l3l3+l4。根据式(11)、式(14)、式(15)可推导出
xout1=xinR1xout=xinR
将式(16)及推导计算式代入拉格朗日运动方程,则二级放大机构的等效质量与等效刚度分别为
M=14m11+R2+18m2(1+163R2+12m3R2+m41+1348R2
K=6ER2kα2R2kαl12l3+3EIl12
式中,kα为柔性铰链的转动刚度;kα=Ebt212{-0.008 9+1.355 6[t/(2r)]-0.522 7[t/(2r)]2}I为截面的二次矩,I=bh312
整体的固有频率为
f=12πK/M
在设计中,位移放大比例是较为重要的考虑因素,而尺寸参数正是决定这一性能的关键所在。所以,应着重分析其对放大比例的影响,进而直观确定各个参数的影响,为后期更好的设计奠定基础。图5所示为直圆形铰链的尺寸参数对放大比例的影响的分析结果。
图5(a)可知,放大机构的放大比例与连接梁的长度l1近乎为递增的线性变化,但观测y轴可明显发现其对放大比例的影响较小,只在较小的幅度发生变化;输入刚度则呈下降趋势,随着l1的增加而减小。由图5(b)可知,柔性铰链的偏移量l2是对放大比例有强烈影响的因素;随着l2的逐渐增大,放大比例先快速达到最大值,然后开始缓慢下降;输入刚度与l1趋势几乎一致,但其影响程度较小。
图5(c)图5(d)则可看出,柔性铰链厚度t与等效后放大机构的厚度b对放大比例的影响较高,都是呈递减趋势,但柔性铰链的厚度下降的趋势更为明显;输入刚度虽都呈上升趋势且影响程度一致,但前者明显有快速上升区间,后者则较为平稳。所以,若要提高放大比例与输入刚度,需要根据情况对l1l2tb进行调整。
比较理论值与仿真值,可得到较小误差,证明理论模型的正确性。但初始参数仅凭个人经验来进行设计,对最终结果存在一定的不确定性,整体的放大比例不能达到最优值,其放大比例为11.1,仍有提升的空间,所以,需要进行整体参数的优化。综合考虑机构的固有频率及输入刚度,以其为约束条件,以放大比例为最终优化目标,进行设计。
因为整体要有较高的抗干扰能力,需要较高的固有频率,所以,固有频率的约束条件为
g1=fmin-fs<0
式中fmin为所约束的最小固有频率;fs为机构整体的固有频率。
对于输入刚度,机构的输入刚度Kin要小于压电陶瓷的输出刚度KPZT,否则机构运动确定性不能保证。则输入刚度的约束条件为
g2=Kin-KPZT<0
以固有频率与输入刚度为约束条件,以放大比例为最终优化目标,所得到的模型为
min1Rs.t. gi<0
考虑到加工及整体结构尺寸的要求,添加以下约束:
0.3 mmt1 mm
10 mml140 mm
1.5 mml23.5 mm
0.5 mmr4 mm
5 mmb8 mm
根据结构,分别有l3=l1+3rl4=l1+2r。压电陶瓷输入刚度KPZT=275 N/m,最低固有频率fmin=50 Hz。将整体数学模型代入Matlab软件中的fmincon优化函数进行求解,能够得到最终的最优尺寸参数,如表1所示。
将最优参数导入Workbench仿真软件并进行有限元分析,通过优化前后仿真值的对比,可以更明确地得到参数优化的结果,进一步验证理论模型的准确性与整体结构的可行性。所用材料为7075Al,这种铝合金具有较高的疲劳强度且质量较轻,符合放大机构所需要求,其主要物理参数如表2所示。
为保证仿真结果的准确性,对整体采用2 mm的网格划分,并在细节处采用0.1 mm的网格划分,如图6所示。在压电陶瓷处添加1 µm的位移输入,通过对输出位移的仿真得到放大机构的放大比例。具体数值如表3所示。
由于放大机构应用于光学器件,其负载较低,对输出端给定y轴负向5 N的负载(图7为放大效果),总体放大比例为11.95,具有较高的输出刚度。图8为二级放大机构的变形图,输出位移从之前的21.5 µm提高到25.5 µm,整体放大比例从11.1提高到13.1,提高了18.0%;图9为应力分布图,应力从47 MPa降低到16 MPa,降低了约66%;图10为放大机构的1阶模态分析图,固有频率从之前的91.7 Hz提高到了92.2 Hz,具有较高的固有频率。有限元仿真与理论计算的误差均控制在7%以内,具有较高的准确性与可行性。造成误差的主要原因:理论结果为柔性铰链理想条件下所获得,而仿真会使柔性铰链中心轴线发生小量偏移。
1)将桥式放大机构与杠杆放大机构相结合,通过压电陶瓷进行驱动,可以实现输入位移的放大。通过分析各部分参数对放大比例与输入刚度的影响,得知柔性铰链的厚度与连接梁铰链的偏移量对整体放大比例具有较为显著的影响。
2)推导出放大机构放大比例与固有频率的数学表达式,并通过Matlab软件中的fmincon,以固有频率、输入刚度为约束条件,以放大比例为目标进行了参数优化,使放大比例从11.1提升至13.1,提高了约18%。
3)通过Workbench软件对放大机构进行有限元仿真,通过静、动态分析,得到误差低于7%的仿真值,验证了理论模型的准确性与可行性。
4)通过仿真分析,提出的放大机构结合了桥式放大机构的高放大比例、高稳定性与杠杆机构的高力学性能,为微位移平台放大机构的研究提供了更好的研究思路。
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2026年第50卷第1期
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doi: 10.16578/j.issn.1004.2539.2026.01.016
  • 接收时间:2025-04-11
  • 首发时间:2026-05-20
  • 出版时间:2026-01-15
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  • 收稿日期:2025-04-11
  • 修回日期:2025-05-24
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    山东建筑大学 机电工程学院,济南250101

通讯作者:

张士军,男,1971年生,山东惠民人,博士,教授;硕士研究生导师;主要研究方向为微位移技术;
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2种不同金属材料的力学参数

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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
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