一种双层回转柔性铰链的设计
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摘要
为了提高回转柔性铰链的平移刚度和回转角度,将直梁与曲面弧形板相结合,形成柔性铰链的变形体,进行了双层回转柔性铰链的设计。基于固定-导向梁的伪刚体模型和串并联弹簧的刚度等效方法,建立了铰链的回转刚度模型。同时,基于伪刚体法建立了柔性铰链的径向平移刚度模型;利用ANSYS软件建立了有限元仿真模型,与理论模型进行了比较,误差约为7%和3%,证明了刚度模型的正确性。通过回转刚度和平移刚度分析,得到所设计的柔性铰链静力学性能,其径向刚度为2 N/mm,可回转角度为30°。
To increase off-axis stiffness and rotating angle, a double-decker rotating flexible hinge is designed, with straight beams and curved plates combined as the flexible body. The model of rotational stiffness is established by pseudo rigid model of fixed-oriented beam and the equivalent method of series and parallel spring. The model of off-axis stiffness is established by the pseudo rigid body method. Then a finite element simulation model is established by using ANSYS software, and compared with the theoretical model. The results show that the rotational stiffness error is about 7% and the off-axis stiffness error is about 3%, which can prove the correctness of the stiffness models. The statics performance of the flexible hinge is clear by analyzing rotating stiffness and off-axis stiffness, whose off-axis stiffness is 2 N/mm and rotating angle is 30°.
To increase off-axis stiffness and rotating angle, a double-decker rotating flexible hinge is designed, with straight beams and curved plates combined as the flexible body. The model of rotational stiffness is established by pseudo rigid model of fixed-oriented beam and the equivalent method of series and parallel spring. The model of off-axis stiffness is established by the pseudo rigid body method. Then a finite element simulation model is established by using ANSYS software, and compared with the theoretical model. The results show that the rotational stiffness error is about 7% and the off-axis stiffness error is about 3%, which can prove the correctness of the stiffness models. The statics performance of the flexible hinge is clear by analyzing rotating stiffness and off-axis stiffness, whose off-axis stiffness is 2 N/mm and rotating angle is 30°.
引文
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[7]TREASE B P,MOON Y M,SKOTA.Design of large-displacement compliant joints[J].Journal of Mechanical Design,2005,127(4):788-798.
[8]MACHEKPOSHTID F,TOLOU N,HERDER J L.A review on compliant joints and rigid-body constant velocity universal joints toward the design of compliant homokinetic couplings[J].Journal of Mechanical Design,2015,137(3):032301.
[9]余跃庆,李清清.Y型柔性铰链的设计与实验[J].光学精密工程,2017,25(2):394-400.
[10]赵山杉,毕树生,宗光华,等.基于曲线柔性单元的新型大变形柔性铰链[J].机械工程学报,2009,45(4):8-12.
[11]邱丽芳,王栋,印思琪,等.X形柔性铰链等效刚度分析及结构特性研究[J].湖南大学学报(自然科学版),2017,44(8):63-69.
[12]GOLDFARB M,SPEICH J.A well-behaved revolute flexure jointfor compliant mechanism design[J].Journal of Mechanical Design,1999,121(3):424-429.
[2]于靖军,郝广波,陈贵敏,等.柔性机构及其应用研究进展[J].机械工程学报,2015,51(13):53-68.
[3]于靖军,裴旭,毕树生,等.柔性铰链机构设计方法的研究进展[J].机械工程学报,2010,46(13):2-13.
[4]PAROS J M,WEISBORD L.How to design flexurehinges[J].Machine Design,1965,37(27):151-156.
[5]ALEXANDRE E.GUERINOT,MAGLEBY S P,et al.Compliant joint design principles for high compressive load situations[J].Journal of Mechanical Design,2005,127(4):774-781.
[6]LUSK C P.Quantifying uncertainty for planar pseudo-rigid bodymodels[C].International Design Engineering Technical Conferences and Computers and Information in Engineering Conference.2011:67-73.
[7]TREASE B P,MOON Y M,SKOTA.Design of large-displacement compliant joints[J].Journal of Mechanical Design,2005,127(4):788-798.
[8]MACHEKPOSHTID F,TOLOU N,HERDER J L.A review on compliant joints and rigid-body constant velocity universal joints toward the design of compliant homokinetic couplings[J].Journal of Mechanical Design,2015,137(3):032301.
[9]余跃庆,李清清.Y型柔性铰链的设计与实验[J].光学精密工程,2017,25(2):394-400.
[10]赵山杉,毕树生,宗光华,等.基于曲线柔性单元的新型大变形柔性铰链[J].机械工程学报,2009,45(4):8-12.
[11]邱丽芳,王栋,印思琪,等.X形柔性铰链等效刚度分析及结构特性研究[J].湖南大学学报(自然科学版),2017,44(8):63-69.
[12]GOLDFARB M,SPEICH J.A well-behaved revolute flexure jointfor compliant mechanism design[J].Journal of Mechanical Design,1999,121(3):424-429.