Static Torsional Stiffness from Dynamic Measurements Using Impedance Modeling Technique

2014 ◽  
pp. 307-316 ◽  
Author(s):  
Hasan G. Pasha ◽  
Randall J. Allemang ◽  
David L. Brown ◽  
Allyn W. Phillips
Keyword(s):  
Torsional Stiffness ◽  
Modeling Technique ◽  
Dynamic Measurements ◽  
Impedance Modeling

A generic impedance modeling technique

2020 ◽  
Vol 123 ◽  
pp. 153301
Author(s):  
Abdulwadood Al-Ali ◽  
Ahmed Elwakil ◽  
Brent Maundy ◽  
David Westwick
Keyword(s):  
Modeling Technique ◽  
Impedance Modeling

Design Optimization of Beams With Multi-Layers of Corrugations

2015 ◽  
Author(s):  
W. N. Cheng ◽  
C. C. Cheng
Keyword(s):  
Dynamic Characteristic ◽  
Frequency Equation ◽  
Optimal Number ◽  
Modeling Technique ◽  
Original Design ◽  
Reduction System ◽  
Straight Beam ◽  
Impedance Modeling ◽  
Corrugated Beam ◽  
Force Equilibrium

Optimal designs of beams with multi-layers of corrugations are introduced in this paper. The dynamic characteristic of corrugated structures is investigated firstly using the impedance modeling technique. The dynamic response of a beam with layers of corrugations is formulated by dividing a corrugated beam into two kinds of structural segments: one, the corrugation modeled as a curved beam using finite element method and the other, the liner treated as a straight beam formulated analytically. Then the frequency equation is derived by assembling the impedance of each structure segment based on conditions of force equilibrium and velocity compatibility. The accuracy of the impedance modeling technique are compared to different existing methods, e.g. FEM, Guyan reduction, improved reduction system (IRS), improved reduction system (DIRS), and iterative improved reduction system (IIRS). Finally, examples of optimal design of corrugated beams are presented. Results further show that with an optimal number of corrugated layers and optimal thickness of liner and medium of each layer, the corrugated beam has a desirable dynamic characteristic, e.g. the first bending natural frequency may increase 40% as compared to that of the original design.

An impedance modeling technique of a fluid‐loaded structure

2005 ◽  
Vol 117 (4) ◽  
pp. 2488-2488
Author(s):  
Chih‐Chun Cheng ◽  
Pi‐Wen Wang
Keyword(s):  
Modeling Technique ◽  
Impedance Modeling ◽  
Loaded Structure

Impedance Modeling Technique for a Fluid-Loaded Structure

AIAA Journal ◽  
2005 ◽  
Vol 43 (11) ◽  
pp. 2454-2465
Author(s):  
C. C. Cheng ◽  
P. W. Wang
Keyword(s):  
Modeling Technique ◽  
Impedance Modeling ◽  
Loaded Structure

Torsional Analysis of a Steel Cord-Rubber Tire Belt Structure

1996 ◽  
Vol 24 (4) ◽  
pp. 339-348 ◽  
Author(s):  
R. M. V. Pidaparti
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Composite Structures ◽  
Three Dimensional ◽  
Element Model ◽  
Torsional Stiffness ◽  
Element Analysis ◽  
Rubber Belt ◽  
Steel Cord ◽  
Torsional Analysis

Abstract A three-dimensional (3D) beam finite element model was developed to investigate the torsional stiffness of a twisted steel-reinforced cord-rubber belt structure. The present 3D beam element takes into account the coupled extension, bending, and twisting deformations characteristic of the complex behavior of cord-rubber composite structures. The extension-twisting coupling due to the twisted nature of the cords was also considered in the finite element model. The results of torsional stiffness obtained from the finite element analysis for twisted cords and the two-ply steel cord-rubber belt structure are compared to the experimental data and other alternate solutions available in the literature. The effects of cord orientation, anisotropy, and rubber core surrounding the twisted cords on the torsional stiffness properties are presented and discussed.

Fore-Aft Forces in Tire-Wheel Assemblies Generated by Unbalances and the Influence of Balancing

1991 ◽  
Vol 19 (3) ◽  
pp. 142-162 ◽  
Author(s):  
D. S. Stutts ◽  
W. Soedel ◽  
S. K. Jha
Keyword(s):  
Mathematical Model ◽  
Elastic Foundation ◽  
Torsional Oscillation ◽  
Vertical Direction ◽  
Torsional Stiffness ◽  
Rolling Motion ◽  
Vertical Force ◽  
Horizontal Force ◽  
Wheel Rim ◽  
Open Question

Abstract When measuring bearing forces of the tire-wheel assembly during drum tests, it was found that beyond certain speeds, the horizontal force variations or so-called fore-aft forces were larger than the force variations in the vertical direction. The explanation of this phenomenon is still somewhat an open question. One of the hypothetical models argues in favor of torsional oscillations caused by a changing rolling radius. But it appears that there is a simpler answer. In this paper, a mathematical model of a tire consisting of a rigid tread ring connected to a freely rotating wheel or hub through an elastic foundation which has radial and torsional stiffness was developed. This model shows that an unbalanced mass on the tread ring will cause an oscillatory rolling motion of the tread ring on the drum which is superimposed on the nominal rolling. This will indeed result in larger fore-aft than vertical force variations beyond certain speeds, which are a function of run-out. The rolling motion is in a certain sense a torsional oscillation, but postulation of a changing rolling radius is not necessary for its creation. The model also shows the limitation on balancing the tire-wheel assembly at the wheel rim if the unbalance occurs at the tread band.

Which dynamic measurements for fluid responsiveness? The right ones

2020 ◽  
Vol 86 (10) ◽  
Author(s):  
Pietro Bertini ◽  
Fabio Guarracino
Keyword(s):  
Fluid Responsiveness ◽  
Dynamic Measurements ◽  
The Right

Ensemble RBF Modeling Technique for Quality Design

2019 ◽  
Author(s):  
Linhan Ouyang ◽  
Liangqi Wan ◽  
Chanseok Park ◽  
Jianjun Wang ◽  
Yizhong Ma
Keyword(s):  
Modeling Technique ◽  
Quality Design
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