Structural Design Changes as a Solution to a Resonance Fatigue Problem of a Sports Car

1993 ◽  
Author(s):  
Herman Van der Auweraer ◽  
Christophe Liefooghe ◽  
Jan Leuridan ◽  
Paul Sas
Keyword(s):  
Structural Design ◽  
Design Changes

Exploratory design using constraints

1987 ◽  
Vol 1 (1) ◽  
pp. 59-71 ◽  
Author(s):  
Weng Tat Chan ◽  
Boyd C. Paulson
Keyword(s):  
Structural Design ◽  
Computer Aided Design ◽  
Design Solution ◽  
Simple Scheme ◽  
Dual Nature ◽  
Design Changes ◽  
Heuristic Procedures ◽  
Rules Of Thumb ◽  
Design Consistency ◽  
Aided Design

Engineering design involves the evaluation and satisfaction of a wide variety of constraints. The ability to represent and process these constraints in a computer is important for the verification of the output produced by computer-aided design programs. Constraints need not only check designs but can also be used to derive design solution s that satisfy constraints. The paper discusses how to represent the dual nature of constraints so that design consistency is maintained as the design evolves.Assumptions and rules of thumb are used frequently in design to propose initial solutions. We represent the logic behind the derivation of these assumptions as heuristic procedures and maintain the dependencies between these assumptions and their consequents as an aid to the management of design consistency. We also propose a simple scheme, involving the partitioning of the design modules, to effect design changes when constraint violations occur. An example from structural design illustrates the methodology.

scholarly journals Simplified Dispersion Relations for Floquet Waves in a Plate With Multiple Arrays of Attachments

1999 ◽  
Author(s):  
Dimitar Gueorguiev ◽  
J. Gregory McDaniel ◽  
Pierre DuPont
Keyword(s):  
Structural Design ◽  
Vibrational Energy ◽  
Finite Element Models ◽  
Large Array ◽  
Energy Localization ◽  
Floquet Waves ◽  
Design Changes ◽  
Array Structures ◽  
Multiple Array ◽  
Analytical Expressions

Abstract Recently, the authors developed analytical expressions for the dispersions of Floquet waves that propagate in a structure consisting of a plate with multiple arrays of line attachments. The dispersions of these Floquet waves, and in particular the imaginary parts of their wavenumbers, quantify the attenuation of vibrational energy in space as the frequency of a local excitation is varied. Understanding how the parameters of the attached structures, such as their spacings and impedances, affect the Floquet wave dispersions could provide further means to include consideration of energy localization or distribution in the structural design process. Such an understanding is developed in the present work by identifying those cases in which the treatment of certain arrays can be greatly simplified. In particular, limiting cases of small and large array spacings are investigated for which the treatment of particular arrays can be greatly simplified. Such simplifications are not immediately obvious without access to analytical expressions for the Floquet wavenumbers, as the dynamics of all arrays are coupled through the plate. Results presented here will aid the structural design community by indicating which design changes most effectively control energy distribution and by indicating when simplified finite element models of multiple-array structures are possible.

Rational Approximants in Structural Design Reanalysis

1984 ◽  
Vol 106 (1) ◽  
pp. 114-118 ◽  
Author(s):  
J. E. Whitesell
Keyword(s):  
Structural Design ◽  
Linear Equations ◽  
Substantial Improvement ◽  
Series Expansions ◽  
Rational Approximants ◽  
Design Changes ◽  
Power Series Expansions ◽  
Poor Convergence ◽  
Repetitive Analysis ◽  
Final Selection

The design of mechanical structures often involves the analysis of several candidate designs before a final selection is made. To avoid the high cost of repetitive analysis, rapid reanalysis methods based on power series expansions have been proposed. While these methods can be effective for small design changes, for larger changes poor convergence or divergence can occur. In this paper a reanalysis method based on rational approximants is presented. The method exploits the superior convergence behavior of rational approximants to gain a substantial improvement in convergence and accuracy. The method is applied to reanalysis problems involving linear equations and eigenproblems and is illustrated through representative examples.

Optimum structural design of seat frames for commercial vehicles

2021 ◽  
Vol 63 (2) ◽  
pp. 138-142
Author(s):  
Yahya Işık ◽  
Mücahit Göle
Keyword(s):  
Structural Design ◽  
Test Results ◽  
Commercial Vehicles ◽  
Passenger Seat ◽  
Design Changes ◽  
Alternative Materials ◽  
Alternative Material ◽  
Seat Frame ◽  
The Cost ◽  
Geometric Changes

Abstract Seat frames in commercial vehicles generally consist of components such as foot brackets, seats, back, head restraints and fasteners. In addition to mechanical properties, comfort is another important parameter. This study aims to reduce the cost of a commercial vehicle by means of alternative materials and design changes in the passenger seat frame. For this purpose, three different methods were used to optimize seat back pipes: reducing the cross-section, using thinner sections in the seat frame via alternative material and making design changes in the foot brackets. In the methods applied, mitigation and cost reductions were achieved. The suitability of the design changes in the seat through geometric changes was confirmed by international ECE R14 test results and finite element method analyses.

An Optimum Connecting Rod Design Study—A Lubrication Viewpoint

1986 ◽  
Vol 108 (3) ◽  
pp. 487-493 ◽  
Author(s):  
Pawan K. Goenka ◽  
Kong Ping Oh
Keyword(s):  
Structural Design ◽  
Gasoline Engine ◽  
Peak Pressure ◽  
Elastohydrodynamic Lubrication ◽  
Connecting Rod ◽  
Support Structure ◽  
Design Changes ◽  
Percent Improvement ◽  
Octahedral Shear Stress ◽  
Effect Of Support

The effect of support structure on the performance of a connecting rod bearing is analyzed by elastohydrodynamic lubrication theory. The support structure is modified iteratively until an optimum design is obtained. With the connecting rod of a typical gasoline engine as an example, it was found that a 150 percent improvement in film thickness and a 34 percent reduction in peak pressure can be obtained by changing the structural design. This design, however, increases the peak octahedral shear stress in the rod. Structural design changes considered were found to have surprisingly little effect on the power loss of the bearing.

Visual Interaction in Acoustic-Structural Analysis of Automobiles

1994 ◽  
Author(s):  
Vijoy Gaddipati ◽  
Judy M. Vance ◽  
Richard DeVries
Keyword(s):  
Structural Design ◽  
Sound Pressure ◽  
Low Frequency ◽  
Frequency Noise ◽  
Noise Levels ◽  
Passenger Compartment ◽  
Structural Vibrations ◽  
Design Variables ◽  
Design Changes ◽  
Graphical Technique

Abstract This paper describes a graphical technique used for investigating the effects of structural design changes on the sound pressure levels generated in an automobile compartment. Low frequency noise in the passenger compartment (in approximately the 20–85 Hz frequency range) is of primary interest, and particularly that noise which is generated by the structural vibrations of the wall panels and various other smaller parts of the compartment. A designer faced with reducing the noise levels at various frequencies typically has several hundred design variables as candidates for change. This paper describes a computer interface that facilitates understanding of the effect various design changes have on the noise levels. This interface allows the designer to investigate the design space to determine which variables hold the most promise for achieving the objectives of noise reduction and allows the designer to set targets or constraints, to a desired confidence level, using the sensitivity information of these design variables. The design targets set in this manner are then input to an optimization algorithm which solves for the optimized sound pressure level.

High-Precision Positioning of Galvano Scanners by Structural Design Using Node of Vibration Modes

2011 ◽  
Vol 131 (3) ◽  
pp. 275-282
Author(s):  
Kenta Seki ◽  
Hiroaki Matsuura ◽  
Makoto Iwasaki ◽  
Hiromu Hirai ◽  
Soichi Tohyama
Keyword(s):  
High Precision ◽  
Structural Design ◽  
Vibration Modes ◽  
Precision Positioning

Structural Design of Office Building

PCI Journal ◽  
1965 ◽  
Vol 10 (1) ◽  
pp. 91-94
Author(s):  
Felix Kulka
Keyword(s):  
Structural Design ◽  
Office Building

Influence of the distribution of the shear walls on the seismic response of the buildings

2020 ◽  
Vol 15 (1) ◽  
pp. 37-44
Author(s):  
El Mehdi Echebba ◽  
Hasnae Boubel ◽  
Oumnia Elmrabet ◽  
Mohamed Rougui
Keyword(s):  
Structural Analysis ◽  
Seismic Response ◽  
Natural Frequency ◽  
Structural Design ◽  
Structural Response ◽  
Shear Walls ◽  
Structural Elements ◽  
Analysis Software ◽  
Ansys Apdl ◽  
The Impact

Abstract In this paper, an evaluation was tried for the impact of structural design on structural response. Several situations are foreseen as the possibilities of changing the distribution of the structural elements (sails, columns, etc.), the width of the structure and the number of floors indicates the adapted type of bracing for a given structure by referring only to its Geometric dimensions. This was done by studying the effect of the technical design of the building on the natural frequency of the structure with the study of the influence of the distribution of the structural elements on the seismic response of the building, taking into account of the requirements of the Moroccan earthquake regulations 2000/2011 and using the ANSYS APDL and Robot Structural Analysis software.

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