An Optimum Embossment of Rectangular Section in Panel to Minimize Noise Power

In this paper, the authors propose a new method for optimum design of embossed panel sections on vibrating panel-like structures to reduce noise. It is proposed in the method to use the mapping of sound pressure level on the vibrating panel’s surface for best positioning of an embossed panel section, which means a raised panel section, in other words, and to apply the particle swarm optimization algorithm for determining the best dimensions of the embossed panel section. The optimum design method is applied to a rectangular aluminum panel whose size is 0.45m×0.4m with thickness 0.001m under the boundary condition of clamping four edge lines. Then, according to the optimum design, an embossed section is actually made in each panel by embossing using a press machine, and experiments are carried out to the panels for verification. The application study is carried out for two cases of different positions of a point force excitation on the panels. The two applications demonstrate that the embossed panel sections designed by the optimization method can realize good reduction of sound power.

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An Optimum Bending Groove Design of Panel to Minimize Noise Power

Volume 1 ◽

10.1115/esda2004-58106 ◽

2004 ◽

Author(s):

Jin-Young Jeon ◽

Masaaki Okuma ◽

Yusuke Nakura

Keyword(s):

Optimum Design ◽

Sound Pressure ◽

Particle Swarm Optimization Algorithm ◽

Design Method ◽

Optimization Method ◽

Noise Power ◽

Good Reduction ◽

Swarm Optimization ◽

Application Study ◽

Force Excitation

In this paper, the authors propose a new method for optimum design of bending grooves on vibrating panel-like structures to reduce noise. It is proposed in the method to use the mapping of sound pressure level on the vibrating panel’s surface for best positioning of a bending groove and to apply the particle swarm optimization algorithm (PSOA) for determining the best dimensions of the bending groove. The optimum design method is applied to a rectangular aluminum panel whose size is 0.45×0.4m with thickness 0.001m under the boundary condition of clamping four edge lines. Then, a panel with a bending groove is actually made according to the optimum design, and an experiment is carried out to the panel for verification. The application study is carried out for two cases of different position of a point force excitation on the panel. The two applications demonstrate that the bending grooves designed by the optimization method can realize good reduction of sound power.

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An Optimum Design Method for a Thermal-Fluid Device Incorporating Multiobjective Topology Optimization With an Adaptive Weighting Scheme

Journal of Mechanical Design ◽

10.1115/1.4038209 ◽

2018 ◽

Vol 140 (3) ◽

Cited By ~ 11

Author(s):

Yuki Sato ◽

Kentaro Yaji ◽

Kazuhiro Izui ◽

Takayuki Yamada ◽

Shinji Nishiwaki

Keyword(s):

Topology Optimization ◽

Heat Exchange ◽

Pressure Drop ◽

Optimum Design ◽

Heat Sink ◽

Pareto Front ◽

Design Method ◽

Optimization Method ◽

Microchannel Heat Sink ◽

Topology Optimization Method

This paper proposes an optimum design method for a two-dimensional microchannel heat sink under a laminar flow assumption that simultaneously provides maximal heat exchange and minimal pressure drop, based on a topology optimization method incorporating Pareto front exploration. First, the formulation of governing equations for the coupled thermal-fluid problem and a level set-based topology optimization method are briefly discussed. Next, an optimum design problem for a microchannel heat sink is formulated as a bi-objective optimization problem. An algorithm for Pareto front exploration is then constructed, based on a scheme that adaptively determines weighting coefficients by solving a linear programming problem. Finally, in the numerical example, the proposed method yields a Pareto front approximation and enables the analysis of the trade-off relationship between heat exchange and pressure drop, confirming the utility of the proposed method.

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Multi-level objective optimization method for high rise frame shear wall structure

10.2749/ghent.2021.0917 ◽

2021 ◽

Author(s):

Jie Yao ◽

Xin Zhao

Keyword(s):

Optimum Design ◽

Design Method ◽

Shear Wall ◽

Optimization Method ◽

Development Trend ◽

Wall Structure ◽

Building Structures ◽

Practical Engineering ◽

Beso Method ◽

Multi Level

<p>Automatic optimum design is the future development trend of structural design. The main purpose of this study is to propose an automatic optimum design method for building structures. Based on the Bidirectional Evolutionary Structural Optimization(BESO) method, this paper introduces the concept of multi-level objective, and proposes Multi-level objective Optimization Method(MLOOM). By reducing the constraint redundancy of structural members, this method can reduce the structural cost as much as possible and allocate the structural materials reasonably. MLOOM is close to the practical engineering experience, and improves the efficiency and effect of optimization based traditional algorithm. Taking two story and ten story steel frame shear wall structure as examples, the efficiency and economy of the optimization method are illustrated.</p>

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An Update on Improved Flange Design Methods

Volume 3: Design and Analysis ◽

10.1115/pvp2007-26643 ◽

2007 ◽

Author(s):

Warren Brown

Keyword(s):

Design Method ◽

Design Methods ◽

Project Development ◽

Design Improvement ◽

Panel Session ◽

Improved Methods ◽

Made In

This paper details further progress made in the PVRC project “Development of Improved Flange Design Method for the ASME VIII, Div.2 Rewrite Project” presented during the panel session on flange design at the 2006 PVP conference in Vancouver. The major areas of flange design improvement indicated by that project are examined and the suggested solutions for implementing the improved methods into the Code are discussed. Further analysis on aspects such as gasket creep and the use of leakage-based design has been conducted. Shortcomings in the proposed ASME flange design method (ASME BFJ) and current CEN flange design methods (EN-1591) are highlighted and methods for resolution of these issues are suggested.

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Lightweight and maintainable rotary-wing UAV frame from configurable design to detailed design

Advances in Mechanical Engineering ◽

10.1177/16878140211034999 ◽

2021 ◽

Vol 13 (7) ◽

pp. 168781402110349

Author(s):

Huiqiang Guo ◽

Mingzhe Li ◽

Pengfei Sun ◽

Changfeng Zhao ◽

Wenjie Zuo ◽

...

Keyword(s):

Design Method ◽

Geometric Model ◽

Optimization Method ◽

Frame Structure ◽

Manufacturing Cost ◽

Detailed Design ◽

High Manufacturing Cost ◽

The Military ◽

Rotary Wing ◽

Novel Design

Rotary-wing unmanned aerial vehicles (UAVs) are widespread in both the military and civilian applications. However, there are still some problems for the UAV design such as the long design period, high manufacturing cost, and difficulty in maintenance. Therefore, this paper proposes a novel design method to obtain a lightweight and maintainable UAV frame from configurable design to detailed design. First, configurable design is implemented to determine the initial design domain of the UAV frame. Second, topology optimization method based on inertia relief theory is used to transform the initial geometric model into the UAV frame structure. Third, process design is considered to improve the manufacturability and maintainability of the UAV frame. Finally, dynamic drop test is used to validate the crashworthiness of the UAV frame. Therefore, a lightweight UAV frame structure composed of thin-walled parts can be obtained and the design period can be greatly reduced via the proposed method.

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Surrogate-Based Optimization of Horizontal Axis Hydrokinetic Turbine Rotor Blades

Energies ◽

10.3390/en14134045 ◽

2021 ◽

Vol 14 (13) ◽

pp. 4045

Author(s):

David Menéndez Arán ◽

Ángel Menéndez

Keyword(s):

Turbine Blade ◽

Design Method ◽

Optimization Method ◽

Turbine Rotor ◽

Computational Effort ◽

Rotor Blades ◽

Linear Functions ◽

Cavitation Inception ◽

Hydrokinetic Turbine ◽

Blade Geometry

A design method was developed for automated, systematic design of hydrokinetic turbine rotor blades. The method coupled a Computational Fluid Dynamics (CFD) solver to estimate the power output of a given turbine with a surrogate-based constrained optimization method. This allowed the characterization of the design space while minimizing the number of analyzed blade geometries and the associated computational effort. An initial blade geometry developed using a lifting line optimization method was selected as the base geometry to generate a turbine blade family by multiplying a series of geometric parameters with corresponding linear functions. A performance database was constructed for the turbine blade family with the CFD solver and used to build the surrogate function. The linear functions were then incorporated into a constrained nonlinear optimization algorithm to solve for the blade geometry with the highest efficiency. A constraint on the minimum pressure on the blade could be set to prevent cavitation inception.

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Optimum design method for four-bar function generator using AIS and genetic algorithms

2013 IEEE INISTA ◽

10.1109/inista.2013.6577639 ◽

2013 ◽

Author(s):

Morteza Saeidi Javash ◽

Mir Mohammad Ettefagh ◽

Yousof Ebneddin Hamidi

Keyword(s):

Genetic Algorithms ◽

Optimum Design ◽

Design Method ◽

Function Generator

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A Mathematical Principle and Application on Design of Planar Six-Bar Mechanism with unto Three-Ordered Intermission at Limit Position(s)

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.37-38.9 ◽

2010 ◽

Vol 37-38 ◽

pp. 9-13

Author(s):

Hong Xin Wang ◽

Ning Dai

Keyword(s):

Design Method ◽

Optimization Method ◽

Basic Function ◽

Mathematical Principle ◽

Transmission Characteristics ◽

Basic Functions ◽

Combined Mechanism ◽

Limit Position ◽

Derivatives Of ◽

Better Than

A non-iterative design method about high order intermittent mechanisms is presented. The mathematical principle is that a compound function produced by two basic functions, and then one to three order derivatives of the compound function are all zeroes when one order derivative of each basic function is zero at the same moment. The design method is that a combined mechanism is constructed by six bars; the displacement functions of the front four-bar and back four-bar mechanisms are separately built, let one order derivatives of two displacement functions separately be zero at the same moment, and then get geometrical relationships and solution on the intermittent mechanism. A design example shows that this method is simpler and transmission characteristics are better than optimization method.

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