共查询到20条相似文献,搜索用时 894 毫秒
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针对连续参数型动力吸振器与弹性薄板构成的耦合系统,以功率流理论为基础,结合有限元方法,分析了连续参数型动力吸振器变阻尼复合梁的吸振特性。与试验结果进行对比可知,变阻尼层复合梁具有吸振频带宽、吸振效果好的特性。为了提升吸振器的吸振效果,通过ANSYS的优化模块,对连续参数型动力吸振器的吸振性能进行了优化设计,优化后的吸振器在多个频率段内吸振性能得以提升,验证了优化方法的有效性。 相似文献
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基于功率流的宽带复式动力吸振器优化设计 总被引:4,自引:0,他引:4
以简支薄板为主振系 ,对其附加复式动力吸振器 ,提出以输入系统的净功率流在整个激励频带内的总声功率级为控制量的优化设计方法。通过算例 ,将普通动力吸振器与复式动力吸振器的吸振效果进行对比 ,揭示了复式动力吸振器适合于弹性体振动控制的宽带吸振性能 ;对复式动力吸振器结构参数优化以及结构参数与安装位置的联合优化设计的研究 ,表明吸振器的安装位置对其吸振效果影响很大 ;另外还研究了质量比与吸振效果的关系 ,为复式动力吸振器在弹性振动控制中的推广应用奠定了基础。 相似文献
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提出一种用于主动式动力吸振器的开环控制方法,使输入主系统的净功率流最小。首先,基于叠加原理,推导输入主系统净功率流的解析表达式,针对特定的系统,计算净功率流值,搜索各激励频率下净功率流的最小值及其对应的主动控制力,对主动控制力进行曲线拟合,得出主动控制力与激振频率的函数关系,即为主动力控制率;最后,对主动式动力吸振器进行频域和时域仿真,结果表明,采用该控制方法的主动式动力吸振器相比于被动式动力吸振器,具有更好的吸振效果和更宽的抑振带宽。对功率流理论及动力吸振器主动控制的研究提供了一种新的思路和方法,具有一定的参考价值。 相似文献
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为满足动力吸振器系统固有频率性能要求,应用Isight集成软件平台进行有阻尼橡胶动力吸振器结构尺寸优化设计。以圆筒形橡胶元件为例,通过数值仿真研究橡胶动力吸振器质量块质量不变时,橡胶元件结构尺寸变化对振动系统固有频率的影响,结果表明动力吸振器系统固有频率随圆筒形橡胶元件结构尺寸的变化而改变。以圆筒形橡胶元件外圆半径、高度和质量块外径作为优化设计变量,以橡胶动力吸振器固有频率为优化目标,建立优化设计数学模型,基于Isight集成平台对橡胶动力吸振器尺寸进行优化。结果表明,优化所得动力吸振器系统固有频率值与目标值吻合较好,误差为4.6%,并通过产品实验验证了优化方法的有效性。 相似文献
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被动式动力吸振技术研究进展 总被引:8,自引:0,他引:8
综述被动式动力吸振技术的研究概况及其发展.根据结构特点和参数形式将动力吸振器分为单自由度型、组合型、多自由度型、连续参数型和非线性参数型等几种类型,针对其安装于不同主振系、在不同激励下的优化设计问题,总结归纳前人的相关研究成果,梳理当前的研究进展,并提炼今后的发展方向.目前用来抑制主振系单个振动模态的单自由度动力吸振器设计理论已经基本成熟,组合型动力吸振器的优化设计问题也得到了较充分的研究,多自由度型、连续型和非线性动力吸振器的设计和应用成为了研究热点.多自由度动力吸振器能够降低吸振代价,提高吸振效率,其结构设计、参数优化和工程应用等问题都有待进一步充分研究.非线性动力吸振器具有更丰富更复杂的动力学行为,有可能产生新现象、新效应,尤其值得更深入地研究.另外,附加多个吸振器后整个系统的动态响应分析方法也是值得关注的问题. 相似文献
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PASSIVE-ACTIVE CONTROL OF POWER FLOW IN AN ISOLATION SYSTEM MOUNTED ON FLEXIBLE FOUNDATIONS 总被引:1,自引:0,他引:1
Huo Rui 《机械工程学报(英文版)》2001,(2):111-115
0 INTRODUCTIONMachinesattachedtostructuresgenerateunwantedvibrationsandstructure bornenoise ,thereforeisolatorsareoftenusedasavibrationcontrolmeasure .Traditionally ,vibrationisolationisperformedby passivedevicessuchassprings ,dampersorextramasses .However,… 相似文献
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Huo Rui College of Mechanical Engineering Shandong University Jinan China Shi Yin College of Power Engineering Naval University of Engineering Wuhan China 《机械工程学报(英文版)》2005,18(2):246-250
In view of difficulties concerned with direct measurement of excitations inside source equipments and their significant influence on vibration isolation effectiveness, a dynamical model, for vibration isolation of a rigid machine with six-degree-of-freedom mounted on a flexible foundation through multiple mounts, is analyzed, in which the complicated and multiple disturbances inside the machine are described as an equivalent excitation spectrum. And a method for the estimation of the equivalent excitation spectrum according to system dynamic responses is discussed for the quantitative prediction of isolation effectiveness. Both theoretical analysis and experimental results are demonstrated. Further work shows the quantitative prediction of transmitted power flow in a flexible vibration isolation experiment system using the proposed equivalent excitation spectrum method, by comparison with its testing results. 相似文献
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General Model to Predict Power Flow Transmitted into Laminated Beam Bases in Flexible Isolation Systems 总被引:1,自引:0,他引:1
For estimating the vibration transmission accurately and performing vibration control efficiently in isolation systems, a novel general model is presented to predict the power flow transmitted into the complicate flexible bases of laminated beams. In the model, the laminated beam bases are simulated by the first-order shear deformation laminated plate theory, which is relatively simple and economic but accurate in predicting the vibration solutions of flexible isolation systems with laminated beam bases in comparison with classical laminated beam theories and higher order theories. On the basis of the presented model, substructure technique and variational principle are employed to obtain the governing equation of the isolation system and the power flow solution. Then, the vibration characteristics of the flexible isolation systems with laminated bases are investigated. Several numerical examples are given to show the validity and efficiency of the presented model. It is concluded that the presented model is the extension of the classical one and it can obtain more accurate power flow solutions. 相似文献
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The main purpose of this paper is to apply structural intensity technique to indicate the magnitude and direction of vibration energy flow for a rotating system, so as to modify and control the energy flow path to reduce the vibrational problems. Numerical simulations are carried out for a rotating flexible disk-spindle system supported by ball bearing and flexible shaft by the finite element method, and the vibrational energy transmission caused by an eccentric mass is analyzed by using structural intensity technique. The structural intensities in hybrid 1D, 2D and 3D elements, which are used to model different components of HDD, are obtained. Three different damping effects on the diversion and dissipation of energy flow are investigated. The calculated results show that different types of damping or dampers have different effect on energy flow path in HDD. Through numerical simulation, a more reasonable design scheme may be explored by scientifically arranging damping components for HDD to further suppress its vibration and noise problems. 相似文献
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0INTRODUCTIONVibrationtransmissionfromamachinesourcetoflexiblesupportingstructuresandtheasociatedsoundradiationfromthevibrat... 相似文献
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Xiong Yeping 《机械工程学报(英文版)》1999,12(2)
A new concept, namely, the equivalent mobility matrix of coupling subsystem is proposed, and the corresponding three-subsystem coupling progressive approach is explored. With the new efficient approach presented, the complexity in dealing with a more complicated dynamic coupling system is greatly reduced. The new modeling method is then combined with the theory of power flow to investigate the dynamics of the overall non-rigid isolation system from the viewpoint of energy. The interaction between the resilient machine of its main modes and the resonant behavior of the flexible foundation on power flow transmission is studied. Taking a machine tool mounted on a multi-story working plant as an example, the dynamic characteristics of the machine-foundation coupling system are analyzed, and their effects on power flow transmission are revealed under various service frequency bands. Some advisable control strategies and the design principle for machinery mounted on flexible structure are proposed. 相似文献
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Optimization of secondary suspension of piecewise linear vibration isolation systems 总被引:1,自引:0,他引:1
Sagar Deshpande Sudhir Mehta G. Nakhaie Jazar 《International Journal of Mechanical Sciences》2006,48(4):341-377
A comprehensive optimal design solution is presented for piecewise-linear vibration isolation systems. First, primary suspension optimum parameters are established, followed by an investigation of jump-avoidance conditions for the secondary suspension. Within the no-jump zones, an optimal design solution is then obtained for the secondary system and overall results are discussed.Averaging method is employed to obtain an implicit function for frequency response of a bilinear system under steady-state conditions. This function is examined for jump-avoidance and a condition is derived which when met ensures that the undesirable phenomenon of ‘jump’ does not occur and the system response is functional and unique. Optimal stiffness and damping parameters for the primary suspension are extracted from a recently established work for passive linear vibration systems. For each point of the primary suspension optimal curve, jump-free zones are identified. Iterating this process, a boundary surface between no-jump (unique response) and jump (multiple-response) areas is established. Keeping optimal parameters for the primary suspension system fixed, the secondary suspension stiffness and damping parameters are varied inside the no-jump zones to explore optimum solutions for the secondary.The root mean square (RMS) of the absolute acceleration is minimized against the RMS of the relative displacement (η). It is observed that there is a certain band of parameters defined by primary damping, within which a valid frequency response can be obtained. An optimum numerical solution is sought within this band of parameters. Optimal solution curves are achieved for the secondary suspension. These can be used in conjunction with the optimal curve for the primary suspension to select design parameter values for the best possible vibration isolation performance in a given application. 相似文献
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复杂机械系统多维耦合振动传递矩阵分析 总被引:9,自引:0,他引:9
以特性传递矩阵描述复杂机械系统中子结构输入、输出力与速度矢量关系,提出了复杂振源激励、多弹性支承与基础板结构三维耦合隔振系统传递矩阵力学模型。考虑隔振支承多维波动效应,推证了弹性支承耦合振动传递矩阵,为复杂系统功率流特性及隔振器多维驻波效应研究确立了有效途经。数值模拟计算表明,基础板结构的前两阶弯曲共振模态是高频域系统功率流提高的主要原因。振源力矩或垂向激振力诱发的隔振器纵向谐振使系统功率流明显提高:增大基础板厚度,驻波共振峰值提高。 相似文献
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为了研究偏心激励下非对称双层隔振系统的功率流特性,建立了在偏心激励下,基座简化为梁的4自由度非对称双层隔振柔性系统的动力学模型。通过对其实例的数值分析和计算,得到了输出功率流的频率谱曲线,并通过研究不对称参数对功率流响应的影响,得出了对应不同位置的偏心激励应采用不同的不对称参数使系统传递的功率流最低的结论。 相似文献