Asymptotic modal analysis for dynamic stresses of a plate

1987 ◽  
Vol 81 (5) ◽  
pp. 1267-1272
Author(s):  
Yuji Kubota ◽  
Earl H. Dowell
Keyword(s):  
Modal Analysis ◽  
Dynamic Stresses

scholarly journals THE HUMAN RACHIS: CAN IT BE CONSIDERED A SHOCK ABSORBER (THAT WAS PRODUCED BY EXAPTATION) RATHER THAN A COLUMN?

2014 ◽  
Vol 6 (1) ◽  
Author(s):  
M. Tanga ◽  
F. Ghelli ◽  
G. Gelati
Keyword(s):  
Modal Analysis ◽  
Shock Absorber ◽  
Elastic System ◽  
Axial Direction ◽  
Continuous Line ◽  
Dynamic Stresses ◽  
Mechanical Feature ◽  
Physiological Conditions ◽  
Typical Function ◽  
Eigenvectors And Eigenvalues

Our paper is focused on two fundamental points: the first one is a terminological proposal and the second one is a question. Obviously these two things are strictly related one another. The terminological proposal is aimed to name “vertebral shock absorber” the human rachis (globally considered, when it is in physiological conditions) in its most typical function: to sustain static/dynamic stresses, that moreover are directed according to its axial direction, obviously when this coincides with gravitational line. This aspects can be studied by modal analysis and by the model of Eigenvectors and Eigenvalues. According to our opinion, the mechanical feature must be considered as prevalent if compared with the structural one. Following it human rachis is usually named “column”. This mechanic sustain is distributed on three lines that are summarily parallel and are linked one another (by isthmuses and vertebral arches to build an horizontal ring) so they can be considered a unique compact viscous-elastic system. Each one of these three vertical sub-structure is built as a stacking of metameric elements (modules) along a continuous line.

Blade Life: A Comparison by Cumulative Damage Theories

1999 ◽  
Vol 123 (4) ◽  
pp. 886-892 ◽  
Author(s):  
J. S. Rao ◽  
A. Pathak ◽  
A. Chawla
Keyword(s):  
Modal Analysis ◽  
Turbine Blade ◽  
Flow Path ◽  
Cumulative Damage ◽  
Practical Application ◽  
Dynamic Stresses ◽  
Linear And Nonlinear ◽  
Comparison Of The Results

A turbine blade is modeled as a rotating pretwisted beam and subjected to aerodynamic excitation from the flow path interference. The resonant stresses are determined using a modal analysis. With the help of steady steam bending and centrifugal stresses and the dynamic stresses, life estimates are made using the linear and nonlinear cumulative damage theories and a comparison of the results is presented. Based on these results, recommendations are made on the usefulness of different theories for practical application.

scholarly journals Blade Life — A Comparison by Cumulative Damage Theories

1999 ◽  
Author(s):  
J. S. Rao ◽  
A. Pathak ◽  
A. Chawla
Keyword(s):  
Modal Analysis ◽  
Turbine Blade ◽  
Flow Path ◽  
Cumulative Damage ◽  
Practical Application ◽  
Dynamic Stresses ◽  
Linear And Nonlinear ◽  
Comparison Of The Results

A turbine blade is modeled as a rotating pretwisted beam and subjected to aerodynamic excitation from the flow path interference. The resonant stresses are determined using a modal analysis. With the help of steady steam bending and centrifugal stresses and the dynamic stresses, life estimates are made using the linear and nonlinear cumulative damage theories and a comparison of the results is presented. Based on these results, recommendations are made on the usefulness of different theories for practical application.

scholarly journals Design of Engine Mount Bracket for a FSAE Car for Deferent Loading Condition

2019 ◽  
Vol 5 (9) ◽  
pp. 28-30
Author(s):  
Sanskar Singh ◽  
Vandana Singh ◽  
Kajol Kumari
Keyword(s):  
Modal Analysis ◽  
High Performance ◽  
Vibrational Energy ◽  
Ride Quality ◽  
Element Analysis ◽  
Dynamic Stresses ◽  
Engine Mounts ◽  
Engine Mount ◽  
And Performance ◽  
Strength And Durability

 Engine mounts have an important function of containing firmly the power-train components of a vehicle. Correct geometry and positioning of the mount brackets on the chassis ensures a good ride quality and performance. As an FSAE car intends to be a high performance vehicle, the brackets on the frame that support the engine undergo high static and dynamic stresses as well as huge amount of vibrations. Hence, dissipating the vibrational energy and keeping the stresses under a pre-determined level of safety should be achieved by careful designing and analysis of the mount brackets. Keeping this in mind the current paper discusses the modeling, Finite Element Analysis, Modal analysis and mass optimization of engine mount brackets for a FSAE car. As the brackets tend to undergo continuous vibrations and varying stresses, the fatigue strength and durability calculations also have been done to ensure engine safety. Keywords: FEA; Modal Analysis; Static Analysis; Optimization; Mounting Bracket

Modal Analysis of Turbulent Flow near an Inclined Bank–Longitudinal Structure Junction

2021 ◽  
Vol 147 (3) ◽  
pp. 04020100
Author(s):  
Nasser Heydari ◽  
Panayiotis Diplas ◽  
J. Nathan Kutz ◽  
Soheil Sadeghi Eshkevari
Keyword(s):  
Turbulent Flow ◽  
Modal Analysis ◽  
Longitudinal Structure

Effect of Bass Bar Tension on Modal Parameters of a Violin's Top Plate

2015 ◽  
Vol 39 (1) ◽  
pp. 145-149 ◽  
Author(s):  
Ewa B. Skrodzka ◽  
Bogumił B.J. Linde ◽  
Antoni Krupa
Keyword(s):  
Modal Analysis ◽  
Experimental Modal Analysis ◽  
Mode Shapes ◽  
Modal Parameters ◽  
Normal Value ◽  
Modal Damping

Abstract Experimental modal analysis of a violin with three different tensions of a bass bar has been performed. The bass bar tension is the only intentionally introduced modification of the instrument. The aim of the study was to find differences and similarities between top plate modal parameters determined by a bass bar perfectly fitting the shape of the top plate, the bass bar with a tension usually applied by luthiers (normal), and the tension higher than the normal value. In the modal analysis four signature modes are taken into account. Bass bar tension does not change the sequence of mode shapes. Changes in modal damping are insignificant. An increase in bass bar tension causes an increase in modal frequencies A0 and B(1+) and does not change the frequencies of modes CBR and B(1-).

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