Active/Passive Vibration Control and Nonlinear Dynamics of Structures最新文献_第2页

Longitudinal Wave Response of an Elastic-Viscoelastic-Elastic Laminate With a Shear Voigt Damping Core 带剪切阻尼芯的弹粘弹弹层合板纵波响应

Active/Passive Vibration Control and Nonlinear Dynamics of Structures Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0556

B. E. Douglas

{"title":"Longitudinal Wave Response of an Elastic-Viscoelastic-Elastic Laminate With a Shear Voigt Damping Core","authors":"B. E. Douglas","doi":"10.1115/imece1997-0556","DOIUrl":"https://doi.org/10.1115/imece1997-0556","url":null,"abstract":"\u0000 The equations of motion for the longitudinal (i.e. in-plane) wave response of an elastic-viscoelastic-elastic laminated beam containing a generalized shear Voigt viscoelastic core are derived along with closed form expressions for the complex flexural wavenumbers. Comparisons with experiment are made in a mechanical mobility format. The existence of this form of damping is supported through the agreement observed between theory and high resolution sine wave dwell measurements of the driving point mechanical mobility of two damped laminates. The generalized shear Voigt damping core is shown to have a significant effect on the damping performance for anti-resonance modes of the laminate with free-free boundary constraints within the spectral band governed by out-of-phase, in-plane motion between the base and constraining layers. This spectral band for shear Voigt damping is determined from consideration of the limiting case of a lumped parameter mass-spring-mass model. In addition, the resonance modes of the free-free laminate showed a waveguide behavior where the damping is equivalent to the internal damping of the base structure. Finally, this analysis coupled with experimental results show the shear Voigt damping mechanism is dominant in elastic-viscoelastic laminates with relatively soft damping cores and/or stiff constraining layers.","PeriodicalId":297791,"journal":{"name":"Active/Passive Vibration Control and Nonlinear Dynamics of Structures","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130437028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the Performance vs. Energy Consumption Tradeoff With Semi-Active Vibration Control Using an MR-Fluid Damper 利用磁流变液阻尼器半主动振动控制的性能与能耗权衡

Active/Passive Vibration Control and Nonlinear Dynamics of Structures Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0559

Jin Lee, W. Clark, Sung Hwan Kim

引用次数: 2

Enhancing the Performance of Constrained Layer Damping by Confining Vibrational Energy 约束振动能提高约束层阻尼性能

Active/Passive Vibration Control and Nonlinear Dynamics of Structures Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0557

D. Allaei, D. Tarnowski

{"title":"Enhancing the Performance of Constrained Layer Damping by Confining Vibrational Energy","authors":"D. Allaei, D. Tarnowski","doi":"10.1115/imece1997-0557","DOIUrl":"https://doi.org/10.1115/imece1997-0557","url":null,"abstract":"\u0000 A feasibility study was conducted to demonstrate that the combination of Constrained Layer Damping (CLD) and Vibration Control by Confinement (VCC) is an effective and viable approach to today’s noise and vibration problems. The objective of this paper is to report on the degree of improvement of CLD when used in conjunction with VCC. Two panel-type structures, resembling a simplified model of the panel section of a car door, are examined. The entire upper surface of the first panel was covered by CLD. On the other hand, only 63% of the second panel is covered by CLD. A confining rib was added to the second panel to localize the vibrational energy to the remaining 37% of its surface over which no CLD was added. The finite element method was employed to model both structures and generate the numerical results presented in this article. Four equally distributed points were identified to excite and measure the response. The plate was subjected to transient and harmonic excitations. Our preliminary results clearly show that not only VCC can be used as a stand-alone mechanism to suppress or isolate vibrations but also can be combined with CLD to significantly improve performance. Furthermore, additional ramifications of the VCC approach as they apply to passive or active vibration control systems are discussed.","PeriodicalId":297791,"journal":{"name":"Active/Passive Vibration Control and Nonlinear Dynamics of Structures","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116758342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Localization of Vibration Propagation in Randomly Disordered Weakly Coupled Two-Dimensional Cantilever-Spring Arrays 随机无序弱耦合二维悬臂-弹簧阵列振动传播的局部化

Active/Passive Vibration Control and Nonlinear Dynamics of Structures Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0571

W. Xie

{"title":"Localization of Vibration Propagation in Randomly Disordered Weakly Coupled Two-Dimensional Cantilever-Spring Arrays","authors":"W. Xie","doi":"10.1115/imece1997-0571","DOIUrl":"https://doi.org/10.1115/imece1997-0571","url":null,"abstract":"\u0000 In this paper, the method of regular perturbation for a linear algebraic system is applied to study localization of vibration propagation in randomly disordered weakly coupled two-dimensional cantilever-spring arrays under external harmonic excitations. Iterative equations are obtained to express the displacement vector of the cantilevers on the Mth “layer” in the Mth-order perturbation in terms of those on the (M − 1)th “layer” in the (M − 1)th-order perturbation. Localization factors, which characterize the average exponential rates of decay of the amplitudes of vibration, are defined in terms of the angles of orientation. First-order approximate results of the localization factors are obtained using a combined analytical-numerical approach. The localization factors are symmetric about the horizontal and vertical axes passing through the cantilever that is being externally excited. For the systems under consideration, the direction in which vibration is dominant corresponds to the smallest localization factor; whereas the “diagonal” directions correspond to the largest localization factor.","PeriodicalId":297791,"journal":{"name":"Active/Passive Vibration Control and Nonlinear Dynamics of Structures","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114443528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nonlinear Phenomena in a Stochastically Excited Dynamic System 随机激励动力系统中的非线性现象

Active/Passive Vibration Control and Nonlinear Dynamics of Structures Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0570

N. van de Wouw, A. de Kraker, D. van Campen

引用次数: 0

Nonlinear Systems With Multiplicative and Additive Perturbation Under State Space Constraints 状态空间约束下具有乘性和加性扰动的非线性系统

Active/Passive Vibration Control and Nonlinear Dynamics of Structures Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0568

F. Colonius, W. Kliemann

{"title":"Nonlinear Systems With Multiplicative and Additive Perturbation Under State Space Constraints","authors":"F. Colonius, W. Kliemann","doi":"10.1115/imece1997-0568","DOIUrl":"https://doi.org/10.1115/imece1997-0568","url":null,"abstract":"\u0000 Realistic models of mechanical systems often depend on various parameters, such as controlled inputs, material constants, tunable parameters, and uncertainties. Uncertain parameters can be (time varying) deterministic perturbations or stochastic excitations whose influence on the system depends on the perturbation dynamics (multiplicative or additive), the perturbation range, and its statistics in the stochastic case. For a given operating region of the system, i.e. for a set of state space constraints, the behavior of the system within this region depends strongly on the type of perturbation dynamics and on its range. We present some basic theory for additively and multiplicatively perturbed systems, where the uncertainty can be a family of time varying functions, or a Markov diffusion process. The uncertainty range plays the role of a bifurcation parameter and determines concepts like discontinuities of control sets and supports of invariant measures, stability radii, and invariance radii with respect to the constraint set. It turns out that in many instances the stochastic and the deterministic bifurcation scenarios agree, and the cases in which they differ are related to a nonuniform behavior of the stochastically perturbed system. The example of a model of ship roll motion is treated in detail, revealing some of the fundamental agreements and disagreements of the two bifurcation scenarios.","PeriodicalId":297791,"journal":{"name":"Active/Passive Vibration Control and Nonlinear Dynamics of Structures","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115252127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Passive Control of Multi-Jointed Structures 多节点结构的被动控制

Active/Passive Vibration Control and Nonlinear Dynamics of Structures Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0561

M. Ettouney, R. Daddazio, N. Abboud

{"title":"Passive Control of Multi-Jointed Structures","authors":"M. Ettouney, R. Daddazio, N. Abboud","doi":"10.1115/imece1997-0561","DOIUrl":"https://doi.org/10.1115/imece1997-0561","url":null,"abstract":"\u0000 Reducing the amplitude of structural response generated by noise sources such as machine vibrations using passive control measures is of interest to design engineers. This study will focus on the role of joints in multi-jointed structures in the passive control of structural response.\u0000 In a multi-jointed structure, joints play a major role in the response of the structure. First, joints regulate the equilibrium of the whole structure. In such a role, they can act, for example, to transform a pure axial wave in a horizontal member in the structure into a pure flexural wave in a vertical member connected to it at a joint. Second, they are the “recipients” of the noise sources from the secondary beams and floors of the structure. In such a role, joints act as a filter between the noise source and the rest of the structure. These two roles point to the possibility of modifying joints so as to passively control the response of a multi-jointed structure.\u0000 In this study, the addition of energy loss mechanisms, which are concentrated at the joints is evaluated. These energy loss mechanisms include adding filler materials with high loss factor. The different parameters affecting the structural response will be evaluated. These parameters include the amount of added material to the joints, relative loss factors of both structure and the added material and the degree of reductions in structural responses. In all the cases studied, a consideration of the practical engineering detailing of such systems will be discussed.","PeriodicalId":297791,"journal":{"name":"Active/Passive Vibration Control and Nonlinear Dynamics of Structures","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130317536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Active Vibration Control Using Modal Techniques 基于模态技术的主动振动控制

Active/Passive Vibration Control and Nonlinear Dynamics of Structures Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0563

Tyler F. Hooper, R. Greif

{"title":"Active Vibration Control Using Modal Techniques","authors":"Tyler F. Hooper, R. Greif","doi":"10.1115/imece1997-0563","DOIUrl":"https://doi.org/10.1115/imece1997-0563","url":null,"abstract":"\u0000 By aligning the coordinates of the control algorithm with the modal coordinates of the flexible structure being controlled, Independent Modal Space Control (IMSC) uses the orthogonality of the mode shapes to minimize the computational requirements of control systems. With an objective of minimizing settling time, a comparison is made of several vibration control algorithms, which use IMSC theory.\u0000 For optimal control, this paper presents an incremental search technique to estimate the preferred R values for a given set of initial conditions. Modified Independent Modal Space Control (MISMC) utilizes a time sharing strategy to share a small number of actuators between a greater number of modes. This technique produced discontinuities in the actuator forces which results in spillover and reduces its effectiveness. The Total Independent Modal Space Control (TIMSC) method, introduced in this paper, avoids significant force discontinuities by using all the available modal information.\u0000 Additional (non-optimal) comparisons include a method for varying R values during the control process, and also control strategies involving actuator force saturation.","PeriodicalId":297791,"journal":{"name":"Active/Passive Vibration Control and Nonlinear Dynamics of Structures","volume":"209 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134333263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Efficient Algorithms for Non-Smooth Dynamics 非光滑动力学的高效算法

Active/Passive Vibration Control and Nonlinear Dynamics of Structures Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0566

Thomas Roßmann, F. Pfeiffer, C. Glocker

引用次数: 6

P-Bifurcations in the Stochastic Version of the Duffing-van der Pol Equation Duffing-van der Pol方程随机版本的p分岔

Active/Passive Vibration Control and Nonlinear Dynamics of Structures Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0574

Y. Liang, N. Namachchivaya

{"title":"P-Bifurcations in the Stochastic Version of the Duffing-van der Pol Equation","authors":"Y. Liang, N. Namachchivaya","doi":"10.1115/imece1997-0574","DOIUrl":"https://doi.org/10.1115/imece1997-0574","url":null,"abstract":"\u0000 In this paper, we shall re-examine the stochastic version of the Duffing-van der Pol equation. As in [2], [9], [19], [22], we shall introduce a multiplicative and an additive stochastic excitation in our case, i.e.x¨=(α+σ1ξ1)x+βx˙+ax3+bx2x˙+σ2ξ2, where, α and β are the bifurcation parameters, ζ1 and ζ2 are white noise processes with intensities σ1 and σ2, respectively. The existence of the extrema of the probability density function is presented for the stochastic system. The method used in this paper is essentially the same as what has been used in [19]. We first reduce the above system to a weakly perturbed conservative system by introducing an appropriate scaling. The corresponding unperturbed system is then studied. Subsequently, by transforming the variables and performing stochastic averaging, we obtain a one-dimensional Itv equation of the Hamiltonian H. The probability density function is found by solving the Fokker-Planck equation. The extrema of the probability density function are then calculated in order to study the so-called P-Bifurcation. The bifurcation pictures for the stochastic version Duffing-van der Pol oscillator with a = −1.0, b = −1.0 over the whole (α, β)-plane are given. The related mean exit time problem has also been studied.","PeriodicalId":297791,"journal":{"name":"Active/Passive Vibration Control and Nonlinear Dynamics of Structures","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127930653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1