共查询到16条相似文献,搜索用时 779 毫秒
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可控约束阻尼层板的控制实验研究 总被引:5,自引:0,他引:5
对具有可控约束阻尼层的板进行了振动控制实验研究. 以压电片作为作动器,根据测量的结构振动信号,反馈控制约束层的变形,抑制板的振动. 对试验件进行了试验模态分析,讨论了压电片的附加位置;采用比例反馈对试验件进行了控制试验;试验给出了控制效果和压电片面积的关系. 研究结果证明,这种利用粘弹性阻尼抑制结构的高频振动,利用压电材料的逆压电效应控制结构的低频振动的主被动杂交控制方式对薄壁结构的振动抑制效果显著,控制频率范围宽,可靠性高. 相似文献
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基于弹性、粘弹性和压电材料本构方程,应用能量法建立了主动约束层阻尼(ACLD)圆柱壳体的有限元动力学方程。通过对压电传感层自感电压的比例、微分反馈控制,对主动约束层阻尼(ACLD)圆柱壳体进行了主被动一体化振动控制,研究了复合圆柱壳体的动力学响应特性。讨论了主动约束层阻尼(ACLD)片体的位置、覆盖率、粘弹性层厚度及控制增益等关键参数对圆柱壳体振动特性的影响。研究表明:主动约束层阻尼(ACLD)片体的粘贴位置与模态有关,针对不同模态,应采用不同的粘贴位置;覆盖率、粘弹性层厚度及控制增益等直接影响到振幅衰减程度,通过对片体位置、覆盖率、粘弹性层厚度及控制增益等关键参数的优化,能有效降低主动约束层阻尼圆柱壳体的振动,具有十分重要的工程应用价值。 相似文献
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可控约束阻尼层板的杂交控制 总被引:5,自引:0,他引:5
用局部压电层控制约束阻尼约束层产生一种新的主、被动杂交控制形式,称为可控制 约束层。本文根据弹性材料、粘弹性材料、压电材料的本构关系和变形连续条件,建立了可控约束阻尼层板的控制微方程;从理论上证明了用离散小压电片组合来代替整体压电层而不影响作动效果,改善了结构的工艺性;利用Galerkin方法和GHM方法建立了系统的近似低阶方程对一试验模型进行了控制数值模拟和试验实现,结果表明这种杂交控制对控制 相似文献
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磁约束双层夹心悬臂梁的振动分析 总被引:1,自引:0,他引:1
采用在约束层端部上设置永磁体的新方法可使阻尼层获得比传统约束阻尼处理方法更高的剪应变,从而增强粘弹层的阻尼耗能,降低共振峰。本文应用Hamilton原理,推导了全覆盖双层约束阻尼悬臂梁的运动方程,对模型进行了实验验证;分析了不同物理和几何参数下该方法的减振效果。研究表明,磁约束能提高阻尼减振效果。随着阻尼层厚度的增加,无磁约束的共振峰降低较少,而有磁约束的共振峰急剧降低,减振效果明显。阻尼层剪切模量G的变化对磁约束减振效果的影响较大;当G小于一定值时,减振效果明显,但当G大于一定值时,减振效果急剧降低。在不同的约束层弹性模量和厚度下,磁约束仍起作用。此外,分析了具有较大控制力的主被动混合磁约束振动控制方法的可行性。 相似文献
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压电复合材料层合板自适应结构的振动控制 总被引:10,自引:0,他引:10
本文针对板壳型自适应结构,研究了压电材料作为作动器的自适应结构的振动控制。利用四节点压电复合材料层合板单元进行自适应结构的有限元动力分析;采用模态控制方法,将结构的各阶模态的阻尼比作为控制目标,并以此计算出各压电片的控制电压,达到控制结构振动的目的。算例给出了数值计算的结果。 相似文献
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采用压电机敏元件进行结构振动控制Ⅲ:控制系统设计与实验研究 总被引:5,自引:0,他引:5
采用作者在上篇导出的压电耦合体动力学模型,给出了压电主动阻尼控制系统的设计方法;导出了压电耦合梁系统的作动方程和检测方程的显式表达式。以此为基础,以简单梁为对象,对压电检测器和作动器的性能、粘结层的影响、压电主动阻尼控制及压电主、被动阻尼双控制进行了实验研究 相似文献
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主动约束层阻尼振动控制研究进展 总被引:4,自引:0,他引:4
主动约束层阻尼(Active Constrained Layer Damping, ACLD)是以可控的压电材料代替被动约束层中不可控的约束层,通过可控的约束层主动地控制黏弹性材料的剪切变形以进一步增大其对振动能量耗散的主动阻尼形式,它充分结合了主动控制与被动阻尼作用各自的优势,使得其在结构振动控制方面显示出极好的应用价值.本文首先解释了ACLD的基本结构和阻尼机理,然后综述了最近几年有关ACLD在结构建模,控制方案及结构优化等方面的最新研究进展,最后指出了应用前景并总结了进一步研究的问题. 相似文献
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The equations of motion governing the vibration of a cantilever beam with partially treated self-sensing active constrained
layer damping treatment(SACLD) are derived by application of the extended Hamilton principle. The assumed-modes method and
closed loop velocity feedback control law are used to analyze and control the flexural vibration of the beam. The influence
of the bonding layer and piezoelectric layer thickness, material properties, placements of the piezoelectric patch and feedback
control parameters on the actuation ability of the vibration suppression are investigated. Some design considerations for
pure passive, pure active control, and self-sensing active constrained layer damping are discussed.
The present work is supported by the National Natural Science Foundation of China (No. 59635140). 相似文献
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基于弹性、粘弹性、电磁学理论,应用Hamilton原理,导出了覆盖电磁约束层阻尼(EMCLD)主动控制方式的梁的控制方程,并针对覆盖EMCLD的悬臂梁,进行了主动控制仿真模拟,得到了较好的控制效果,分析了控制电流和阻尼层厚度对控制效果的影响.结果表明电磁约束阻尼技术具有结构简单、作动方式合理、耗能低的优点,是一种有效的振动主动控制方式. 相似文献
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IntroductionTheconventionalpassiveconstrainedlayerdamping(PCLD)treatmentshavebeenextensivelyutilizedasasimpleandreliablemeansfordampingoutthevibrationofvariousstructures(MeadandMarkus1969[1],Y.K.Cheung1972[2],JohnsonandKienholz1982[3],CupialandNiziol… 相似文献
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《International Journal of Solids and Structures》2003,40(24):6767-6779
This paper has presented a new class of active and passive magnetic constrained layer damping (APMCLD) treatment for controlling vibration of three-layer clamped–clamped beams. Firstly, optimal placement strategies of discrete patches are investigated. The predictions of model are validated experimentally using three-layer clamped–clamped beams treated with fully or segmented passive magnetic constrained layer damping (MCLD) treatments. The results indicate that full MCLD treatment induces less improvement of damping characteristics. Also, the obtained results illustrate that, the improvement of damping performance using two-patched MCLD treatment becomes more apparent at the first mode compared to the corresponding performance using a single-patched MCLD treatment when the total length of damping layer is from 0.3L to 0.65L under considered magnetic force. Further, damping performances of APMCLD using several control strategies including simple PD controllers are investigated. The analytical results show that it induces less improvement of damping characteristics for higher modes using simple positive proportional feedback controllers whereas higher modes can been suppressed effectively using negative derivative feedback controllers. For broad band control of structural vibration, it is more effective using APMCLD treatments with combined proportional and derivative controllers. Moreover, the MCLD treatment still plays an important role in damping out structural vibrations even though active control systems fail. 相似文献
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A new model for a smart shell of revolution treated with active constrained layer damping (ACLD) is developed, and the damping effects of the ACLD treatment are discussed. The motion and electric analytical formulation of the piezoelectric constrained layer are presented first. Based on the authors~ recent research on shells of revolution treated with passive constrained layer damping (PCLD), the integrated first-order differential matrix equation of a shell of revolution partially treated with ring ACLD blocks is derived in the frequency domain. By virtue of the extended homogeneous capacity precision integration technology, a stable and simple numerical method is further proposed to solve the above equation. Then, the vibration responses of an ACLD shell of revolution are measured by using the present model and method. The results show that the control performance of the ACLD treatment is complicated and frequency-dependent. In a certain frequency range, the ACLD treatment can achieve better damping characteristics compared with the conventional PCLD treatment. 相似文献