The modal analysis is an important step during the project of structures. Throughout it, it is possible to know structural properties that may help when it is necessary to analyze the integrity of the system. Many studies and researches are being developed to understand more deeply the phenoms that involve mechanical vibrations, especially because of their importance. One of these phenoms, for example, crucial in aeroelasticity, is the flutter, that requires the coupling of two different...

Topics: Modal analysis, Natural frequencies, Plastic deformation.

This work presents a new approach to find the exact solutions for the free vibration analysis of a beam based on the Timoshenko type with different boundary conditions. The solutions are obtained by the method of Lagrange multipliers in which the free vibration problem is posed as a constrained variational problem. The Legendre orthogonal polynomials are used as the beam eigenfunctions. Natural frequencies and mode shapes of various Timoshenko beams are presented to demonstrate the efficiency...

Topics: Timoshenko Beam, Natural Frequencies, Mode Shapes, Legendre Polynomials, Lagrange Multipliers

Modal analysis helps to determine the system frequencies and to obtain the eigen modes of various structural members subjected to vibration. In this research, modal analysis and harmonic analysis of a cantilever beam with different sections of same weight and material i.e., rectangle, T-section and I-section are carried out using ANSYS software to see the mode shapes and to observe the dynamic response of the cantilever beam and to identify the best configuration of the beam.

Topics: Modal Analysis, Mode Shapes, Natural Frequencies, Harmonic Analysis, Dynamic Response & Ansys

A digital computer program, originally developed by George E. Fink, capable of determining the in-and/or out-of-plane vibration frequencies of a single plane piping system, using the basic transfer method, is modified and augmented by the writer. The program is modified to use the writer's method to reduce the amount of calculation and is augmented to use Marguerre and Uhrig's modifying frequency determinant method and Pestel and Mahrenholtz' s remainder method for higher natural frequencies....

Topics: Mechanical engineering, piping systems, vibration analysis, computer program, transfer matrix,...

Hat section has excellent properties, in bending about its both principal axes. Due to this property, hat section is generally used to increase the strength of the parent structure. Therefore, hat stiffened structures, finds many industrial applications like in automobile, airplane, and naval ships. In all such applications, an inherent structure that finds is a hat stiffened plate. This paper has presented an analysis of diagonally hat stiffened plate structure for the detection of damage...

Topics: Hat-Stiffened Plate, Natural Frequencies, Conjugates Beam Method, Modal Analysis & Damage...

The vibratory screening machine is used in different industries like mining, pharmaceutical, food etc. In the past, the study of screening machine has been done on the basis of its design parameters like diameter of wire, length, mesh size, throwing index etc. The work regarding vibration parameters is not widely done in the past. A little work on mathematical modeling has been done on the rectangular type vibratory screening machine. In this paper modal and harmonic analysis has been done to...

Topics: Modal Analysis, Harmonic Analysis, Natural frequencies of Vibrating screening Machine, Mechanical...

In this study, the sound radiation characteristic of an annular circular plate with parabolically varying thickness with different taper ratios and different excitation locations are analysed.The mass of the plate is kept constant for all thickness variations. Rayleigh integral is applied to determine the acoustic radiation coupling between interacting structural modes of the plate. Further, this method is applied to determine the self and mutual radiation from out of plane (m, n) th modes. The...

Topics: Thick Annular Plate, Natural Frequencies, Taper Ratio, Sound Power, Tapered Plate & Parabolic...

In structural engineering, a finite element model is often used to estimate its dynamic or static behavior, and in conjunction with measured data, to monitor the health of a structure. This research is focusing on the use of experimental data for the improvement of a finite element model such that it accurately represents the structure, and in the localization of artificial damage in the model. The method of Artificial Boundary Conditions in model update and damage identification is used. To...

Topics: artificial boundary conditions, finite element model, model update, damage identification, natural...

Efforts to establish a helicopter research program in structural dynamics at NPS were greatly enhanced when the U. S. Army donated two OH-6A light observation helicopters. One of the helicopters is reserved for ground vibration testing and dynamics research. Vibration measurements are extremely important in predicting and understanding an aircraft's dynamic behavior and durability. A comparison of a helicopters natural frequencies and those frequencies transmitted to the airframe through the...

Topics: Helicopter, Vibration analysis, Vibration testing, Natural frequencies, Mode shapes, Structural...

In this paper, a simplified equation of motion is developed to simulate a submerged cable subjected to two degree of freedom using method of influence coefficient. A submerged cable as a continuous system with distributed masses is idealized as a lumped mass system with distributed masses lumped at two chosen points called the nodal points. The lumped masses are assumed to undergo normal mode oscillation at the chosen nodal points. A numerical example is given to illustrate the performance and...

Topics: KEYWORDS: Dynamic model, simulate, submerged cable, Two-degree of freedom, natural frequencies,...

Sensitivity-based finite element model updating and structural damage detection has been limited by the number of modes available in a vibration test and also by the corresponding amount of natural frequency sensitivity data. The method of Artificial Boundary Conditions (ABC) has been shown to greatly increase the number of modes and corresponding sensitivity data by artificially constraining the structure under test, producing a large number of alternative test configurations and associated...

Topics: artificial boundary conditions, artificial beam modification, finite element model, model update,...

Mathematical simulation of dynamic processes of micro-assemblies instrument devices elements is an actual issue, allowing accept design and technological solutions to ensure the required level of vibration strength and vibration stability of micro-assemblies in operating conditions in the early stages of design. The aim of the work is to increase reliability and provide tactical and technical characteristics of the instrument devices through the design and technological methods. Micro assembly...

Topics: Instrument Devices, micro-assembly, Heterogeneous Structure, Natural Frequencies, Wave Shape, The...

This thesis is part of the helicopter research program established at The Naval Postgraduate School (NPS). NPS currently has two OH-6A light observation helicopters which were obtained from the U.S. Army. One of these is dedicated to ground vibration testing and dynamics research. Previous research on the OH-6A at NPS established baseline vibration test data. The data includes natural frequencies, principal mode shapes and damping characteristics. This thesis continues previous research of the...

Topics: HELICOPTERS, Helicopter, OH-6A, Vibration Analysis, Finite Element Modeling, Modal Analysis,...

From the bitsavers.org collection, a scanned-in computer-related document. ibm :: proceedings :: IBM Computation Seminar Aug51

Topics: storage, program, equations, selector, ibm, method, fuselage, bending, computation, control panel,...

J. S. Rao - History of Rotating Machinery Dynamics

Topics: rotor, methods, vibration, blade, finite, shaft, matrix, stiffness, equation, element, finite...

Bell System Technical Journal, 4: 2. April 1925 pp 280-326. Some Contemporary Advances in Physics - VII Waves and Quanta. (Darrow, Karl K.)

Topics: energy, electrons, electron, frequency, quanta, momentum, atom, radiation, vii, frequencies,...

Tom Proulx - Sensors, Instrumentation and Special Topics, Volume 6

Topics: frequency, acoustic, damage, model, figure, structural, measurement, mode, data, vibration, natural...

Mohammad I. Younis - MEMS Linear and Nonlinear Statics and Dynamics

Topics: mems, beam, frequency, nonlinear, damping, equation, force, response, cantilever, electrostatic,...

Vytautas Ostasevicius, Rolanas Dauksevicius - Microsystems Dynamics

Topics: microcantilever, vibration, rotor, frequency, micromotor, mems, electrostatic, vibrations, poles,...

From the bitsavers.org collection, a scanned-in computer-related document. mit :: ai :: aim :: AITR-1009

Topics: mode, robot, vibration, modal, shape, figure, model, data, chapter, modes, mode shape, shape data,...

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Potential of neural networks for structural damage localization Potencial de redes neuronales para localización de daño estructural Miguel Abambres*, Marília Marcy , Graciela Doz *Autor para Correspondencia / Corresponding Author, e-mail: abambres@netcabo.pt DOI: https://doi.org/10.18272/aci.v11i2.1305 Editado por / Edited by: Eva O.L. Lantsoght Recibido / Received: 2018/11/15 Aceptado / Accepted: 2018/12/17 Publicado en línea /pdf online first: 2019/01/30 Final PDF: 2019/05/30 Abstract...

Topics: Structural Health Monitoring, Damage Localization, Steel Beams, Dynamic Properties, Natural...