Dynamics of rotationally periodic structures

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Webadshelp[at]cfa.harvard.edu The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A WebThis research will focus on nonlinear vibrations and wave propagation to enable the development of new multi-functional metamaterial devices. The novel self-adaptive metamaterials use a sliding mass mechanism to tune the bandgap to different frequency ranges. This self-adaptive mechanism will be integrated in periodic and quasiperiodic ...

Dual-mode frequency splitting elimination of ring periodic structures ...

WebThe proposed method of analysis is based on the general theory of spatially periodic structures. The main feature of this theory is the possibility to apply Discrete Fourier Transform (DFT) ... Thomas D. L. Dynamics of rotationally periodic structures. Int. J. Numer. Methods Eng., 1979, 14, 81–102. Crossref. ISI. WebDynamics of rotationally periodic large space structure The analysis of large area rotationally periodic space structures presented in the paper combines the finite … imaginext buzz lightyear toys

Dynamical analysis of multi-stage cyclic structures

WebJun 1, 2007 · Rotationally periodic structures are used in many engineering applications such as turbine bladed disks or gear wheels. It is well known that the dynamics of such … WebDYNAMICS OF ROTATIONALLY PER1OL)IC STRUCTURES 83 analysis of the structure, provided it is linearly elastic. Furthermore it is not confined to vibration, but can be used … WebThe free and forced motions of a nonlinear periodic structure with cyclic symmetry are studied. The structure consists of a number of identical linear flexural members coupled … imaginext catwoman

Continuum Models for Beam- and Platelike Lattice Structures

Analysis of the railway track as a spatially periodic structure

WebFeb 8, 1980 · For a 100 m parabolic dish structure with 3642 structural members contained in 44 units, the periodic analysis involves less than 5% of the variables of a finite element analysis. The frequency response functions obtained are used to compare added coatings, gyroscopic, and tuned damping devices for reducing the responses of large … WebMay 1, 2011 · The model was extended to investigate the collective dynamics of periodic nonlinear two-dimensional arrays, and two applications have been considered: (i) a 2D array of coupled pendulums under ... imaginext charactersWebJul 1, 1999 · This paper proposes a multi-mode vibration suppression scheme for rotationally periodic structures. Identical active-passive hybrid piezoelectric networks … imaginext characters names

"WebRotationally periodic structures are used in many engineering applications such as turbine bladed disks or gear wheels. It is well known that the dynamics of such structures can be studied using the cyclic symmetry reduction. This method makes it possible to analyse the complete cyclic structure by considering a single elementary sector. " - Dynamics of rotationally periodic structures

Dynamics of rotationally periodic structures

Dynamical Analysis of Multi-Stage Cyclic Structures

WebJan 1, 1987 · To obtain the natural frequencies of rotationally periodic structures, a simple block solver is developed. Complex arithmetic is used to reduce the analysis region to a repeating substructure; characteristic matrices are considered to be cyclic in nature (S. Michimura et al., Bull. Jap. Soc. Mech. Engrs24,1968–1993, 1981).Most of the …

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WebApr 19, 2001 · The forced vibration of a rotationally periodic structure when subjected to travelling wave excitation is discussed, with emphasis placed on the steady-state response of doublet modes having either repeated or split frequencies. Such vibration modes have spatially modulated shapes defined by (1) the number of nodal diameters … Web2. Rotationally Periodic Structures. A bladed disk or drum equipped with blades is said to have cyclic symmetry, with an interblade phase angle of .It is possible to analyze the complete structure by considering only one substructure [13, 14].Considering two points at the same relative position in two adjacent sectors, the free vibration modes of cyclic …

WebOct 1, 2007 · D. L. Thomas, “Dynamics of Rotationally Periodic Structures”, International Journal for Nu- merical Methods in Engineering 14 , 81 (1979). J. Wildheim, “Excitation of Rotationally ... WebOct 3, 2011 · The proposed method of analysis is based on the general theory of spatially periodic structures. The main feature of this theory is the possibility to apply Discrete Fourier Transform (DFT) in order to reduce a large system of q (2 N + 1) linear stiffness equilibrium equations to a set of 2 N + 1 uncoupled systems of q equations each.

WebI. Romanescu's 12 research works with 353 citations and 4,379 reads, including: Passive Damping of Rotationally Periodic Structures with Tuned Piezoelectric Inductive Shunt WebMay 1, 2011 · The model was extended to investigate the collective dynamics of periodic nonlinear two-dimensional arrays, and two applications have been considered: (i) a 2D …

WebJul 1, 2007 · Periodic forced response of structures having three-dimensional frictional constraints. Journal of Sound and Vibration, 229 (4) (2000), pp. 775-792. ... Dynamics of rotationally periodic structures. International Journal for Numerical Methods in Engineering, 14 (1979), pp. 81-102.

WebJun 1, 1986 · Dynamics of rotationally periodic structures. Internat. J. Numer. Meths. Engrg. (1979) D.J. Mead Wave propagation and natural modes in periodic systems. J. Sound Vibration (1975) View more references. Cited by (71) Anisotropic yield models for lattice unit cell structures exploiting orthotropic symmetry. imaginext city dump truckWebApr 18, 2005 · Dynamics of rotationally periodic structures. Article. Jan 1979; INT J NUMER METH ENG; D. L. Thomas; The paper considers the finite element analysis of the free, undamped and the forced damped ... list of foods high in potassium chartWebThe status and some recent developments of continuum modeling for large repetitive lattice structures are summarized. Discussion focuses on a number of aspects including definition of an effective substitute continuum; characterization of the continuum model; and the different approaches for the generation of the properties of the continuum, namely, … imaginext cityWebJan 1, 1979 · Dynamics of rotationally periodic structures Thomas, D. L. 1979-01-01 00:00:00 Central Electricity Research Laboratories, Leatherhead, Surrey, England … imaginext cheapWebMay 1, 2002 · Dynamic analysis of a composite rotor. Sahli Souhila, B. Ahmed, Benadda Mohamed. Engineering. 2024. Rotor dynamic is a branch of applied mechanics that … list of foods high in silicaWebThe method has been implemented in a computer program and is illustrated by analyses of an alternator end winding, a cooling tower with legs, and a wheel of turbine blades. For forced vibration, it is shown that any arbitrary oscillatory force can be decomposed into … list of foods high in uric acid pdfWebFeb 8, 1980 · Space structures can be described in most cases as two dimensional periodic or rotationally periodic structures. Due to the extremely large number of … list of foods high in tyramine