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Keyword: damping
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Journal Articles
Article Type: Research-Article
J. Appl. Mech. May 2014, 81(5): 051015.
Paper No: JAM-13-1440
Published Online: January 15, 2014
... Most composites exhibit a damping figure of merit, a crucial index of a material's dynamic behavior, lower than the value predicted by the Hashin–Shtrikman bound. This work found that the biomimetic hierarchical staggered composites inspired by bone structure can have a damping figure of merit tens of...
Journal Articles
Article Type: Special Section: Computational Fluid Mechanics And Fluid–Structure Interaction
J. Appl. Mech. January 2012, 79(1): 010902.
Published Online: December 13, 2011
...Thomas Miras; Jean-Sébastien Schotté; Roger Ohayon It is proposed to investigate in this paper the damped vibrations of an incompressible liquid contained in a deformable tank. A linearized formulation describing the small movements of the system is presented. At first, a diagonal damping is...
Journal Articles
Article Type: Research Papers
J. Appl. Mech. January 2012, 79(1): 011007.
Published Online: December 8, 2011
... ) are about 13 000 for the first mode ( x ) and 10 000 for the second mode ( ϕ ). A threshold value of linear damping coefficient can be used directly for vibration suppression of both vibration modes. Comparison with the available published work is reported. 27 10 2009 24 04 2011 08 12...
Journal Articles
Article Type: Research Papers
J. Appl. Mech. July 2011, 78(4): 041013.
Published Online: April 13, 2011
... damping ratio ζ eff , which depends on the resonator dimensions, and is proportional to the square root of the viscosity times the fluid density. 03 08 2010 06 03 2011 08 03 2011 13 04 2011 13 04 2011 damping frequency response mechanical stability plates (structures...
Journal Articles
Article Type: Research Papers
J. Appl. Mech. May 2011, 78(3): 031004.
Published Online: February 7, 2011
... decay. The results from the dynamic measurement are compared with conventional static test and presented in the form of aerodynamic magnification. The yaw moment derivative exceeds that determined statically across reduced frequency range measured. The yaw damping derivative was found to be a function...
Journal Articles
Article Type: Research Papers
J. Appl. Mech. March 2011, 78(2): 021017.
Published Online: December 20, 2010
...Arnaud F. M. Bizard; Digby D. Symons; Norman A. Fleck; David Durban A one dimensional analytical model is developed for the steady state, axisymmetric flow of damp powder within a rotating impervious cone. The powder spins with the cone but migrates up the wall of the cone (along a generator) under...
Journal Articles
Article Type: Research Papers
J. Appl. Mech. March 2011, 78(2): 021002.
Published Online: November 4, 2010
...Y. Zeng; W. Q. Zhu A stochastic averaging method for predicting the response of multi-degree-of-freedom quasi-nonintegrable-Hamiltonian systems (nonintegrable-Hamiltonian systems with lightly linear and (or) nonlinear dampings subject to weakly external and (or) parametric excitations of Poisson...
Journal Articles
Article Type: Technical Briefs
J. Appl. Mech. January 2011, 78(1): 014501.
Published Online: October 8, 2010
...Ivan Wang The half power method is a technique commonly used for calculating the system damping using frequency response curves. Past derivations typically assume a small damping ratio but do not keep track of the order of magnitude when simplifying results and focus mainly on displacement...
Journal Articles
Article Type: Research Papers
J. Appl. Mech. November 2010, 77(6): 061013.
Published Online: September 1, 2010
... the study consists of proving, in the case of classical damping, the independency of the stiffness subpartition corresponding to the measured degrees-of-freedom from the unmeasured ones. The same result is shown to be valid in the case of nonclassical damping but only for tridiagonal sparse stiffness...
Journal Articles
Article Type: Research Papers
J. Appl. Mech. July 2010, 77(4): 041003.
Published Online: March 31, 2010
... second-order approach is proposed for this type of problems. The proposed approximation utilizes the idea of generalized proportional damping and expressions of approximate eigenvalues of the system. A closed-form expression of the equivalent second-order system has been derived. The new expression is...
Journal Articles
Article Type: Research Papers
J. Appl. Mech. January 2010, 77(1): 011014.
Published Online: October 5, 2009
... effect of magnetic viscous damping, a new theoretical model is constructed in this study to predict the natural frequency of a soft ferromagnetic beam plate placed in an in-plane magnetic field. The numerical results of the present study are displayed graphically and compared with the experimental data...
Journal Articles
Article Type: Research Papers
J. Appl. Mech. January 2010, 77(1): 011001.
Published Online: September 23, 2009
... flexible cylinder and some examples are presented. The effect of material viscoelasticity and structural damping on the stability margins of the flexible cylinder is examined, and some parameter studies on the governing parameters of the critical spinning speed are carried out. 30 08 2008 06 06...
Journal Articles
Article Type: Research Papers
J. Appl. Mech. November 2009, 76(6): 061018.
Published Online: July 27, 2009
... is friction, along interfaces arising from defects between and within the “splats” created during application. An analysis, similar to that for the dissipation in a lap joint, is developed for an idealized microstructure characteristic of such coatings. A measure of damping (loss modulus) is...
Journal Articles
Article Type: Research Papers
J. Appl. Mech. November 2009, 76(6): 061010.
Published Online: July 23, 2009
... dissipation effects. The study provides a basis to predict the particle impact damping containing plastic deformation and to model the impact damped vibration system enrolling microparticles as a damping agent. 03 03 2008 23 03 2009 23 07 2009 damping elastic deformation elastic...
Journal Articles
Article Type: Research Papers
J. Appl. Mech. September 2009, 76(5): 051008.
Published Online: June 18, 2009
... Ghosh and Mukherjee, and undamped vibrations are addressed there. The effect of damping due to the surrounding fluid modeled as Stokes flow is included in the present paper. Here, the elastic field modeled by the FEM is coupled with the applied electric field and the fluid field, both modeled by the BEM...
Journal Articles
Article Type: Research Papers
J. Appl. Mech. July 2009, 76(4): 041007.
Published Online: April 22, 2009
... 2009 damping eigenvalues and eigenfunctions Lyapunov methods method of moments noise partial differential equations resonance stability stochastic processes parametric resonance moment Lyapunov exponents bounded noise The equations of motion for many engineering problems...
Journal Articles
Article Type: Research Papers
J. Appl. Mech. May 2009, 76(3): 031005.
Published Online: March 5, 2009
...Jun Yu; Maura Imbimbo; Raimondo Betti In this paper, a methodology is presented for the identification of the complete mass, damping, and stiffness matrices of a dynamical system using a limited number of time histories of the input excitation and of the response output. Usually, in this type of...
Journal Articles
Article Type: Research Papers
J. Appl. Mech. November 2008, 75(6): 061020.
Published Online: August 21, 2008
... has its apex at the origin of the inertial reference frame. The results show that at low speed both the weave- and wobble-mode stabilities are at a maximum when the machine is perpendicular to the road surface. This trend is reversed at high speed, since the weave- and wobble-mode dampings are...
Journal Articles
Article Type: Research Papers
J. Appl. Mech. November 2008, 75(6): 061005.
Published Online: August 15, 2008
.... Stationarity properties are examined based on the perturbation theory. It is shown that Rayleigh quotients with stationary properties exist for systems with proportional viscous and nonviscous damping forces. It is also shown that the stationarity property of Rayleigh quotients in the case of nonproportional...
Journal Articles
Article Type: Research Papers
J. Appl. Mech. September 2008, 75(5): 051005.
Published Online: July 2, 2008
...Yitshak M. Ram; Kumar Vikram Singh In general, it is not possible to obtain total motion absorption of a certain degree of freedom in a harmonically excited damped system by passive control. This paper presents a method of obtaining total absorption in viscously damped system by active control...