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Journal articles on the topic 'Mechanical optimizations'

Author: Grafiati
Published: 9 June 2023

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1

Vlahopoulos, N., and C. G. Hart. "A Multidisciplinary Design Optimization Approach to Relating Affordability and Performance in a Conceptual Submarine Design." Journal of Ship Production and Design 26, no. 04 (2010): 273–89. http://dx.doi.org/10.5957/jspd.2010.26.4.273.

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A multidisciplinary design optimization (MDO) framework is used for a conceptual submarine design study. Four discipline-level performances—internal deck area, powering, maneuvering, and structural analysis—are optimized simultaneously. The four discipline-level optimizations are driven by a system level optimization that minimizes the manufacturing cost while at the same time coordinates the exchange of information and the interaction among the discipline-level optimizations. Thus, the interaction among individual optimizations is captured along with the impact of the physical characteristics
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2

Mo, Yu Zhen, and Jia Chu Xu. "Studies on Mechanical Properties and Optimization Model of PI/SiO2 Nanocomposite Based on Materials Studio." Advanced Materials Research 1049-1050 (October 2014): 54–57. http://dx.doi.org/10.4028/www.scientific.net/amr.1049-1050.54.

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The unit cell models of PI/SiO2 nanocomposite was built by Materials Studio. The stiffness matrix and mechanical properties parameters such as Young modulus, shear modulus, bulk modulus and Poisson ratio of the unit cells were achieved after molecular dynamic (MD) optimizations and calculations. The influence factors on the mechanical properties of nanocomposite were analyzed. Finally, the optimization model was achieved.
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Xu, Haoran, Lingen Chen, Yanlin Ge, and Huijun Feng. "Four-Objective Optimization of an Irreversible Stirling Heat Engine with Linear Phenomenological Heat-Transfer Law." Entropy 24, no. 10 (2022): 1491. http://dx.doi.org/10.3390/e24101491.

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This paper combines the mechanical efficiency theory and finite time thermodynamic theory to perform optimization on an irreversible Stirling heat-engine cycle, in which heat transfer between working fluid and heat reservoir obeys linear phenomenological heat-transfer law. There are mechanical losses, as well as heat leakage, thermal resistance, and regeneration loss. We treated temperature ratio x of working fluid and volume compression ratio λ as optimization variables, and used the NSGA-II algorithm to carry out multi-objective optimization on four optimization objectives, namely, dimension
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4

Lee, Youngmyung, Yong-Ha Han, Sang-ok Park, and Gyung-Jin Park. "Vehicle crash optimization considering a roof crush test and a side impact test." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 233, no. 10 (2018): 2455–66. http://dx.doi.org/10.1177/0954407018794259.

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The vehicle performances for the side impact test and the roof crush test are dependent on the side structure design of a vehicle. Crash optimization can be employed to enhance the performances. A meta-model-based structural optimization technique is generally utilized in the optimization process since the technique is simple to use. However, the meta-model-based optimization is not suitable for problems with many design variables such as topology and topometry optimizations. A crash optimization methodology is proposed to consider both the side impact test and the roof crush test. The equival
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Sun, S., Z. Fan, Y. Wang, and J. Haliburton. "Organic solar cell optimizations." Journal of Materials Science 40, no. 6 (2005): 1429–43. http://dx.doi.org/10.1007/s10853-005-0579-x.

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6

Du, Yun Peng, Guo Liang Hu, and Fei Dong. "Study on Structural Design and Optimization Analysis for 2V80 Engine Piston Based on Finite Element Analysis." Advanced Materials Research 753-755 (August 2013): 1188–91. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.1188.

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According to the experiment of engine bench test and piston's temperature field, the thermal boundary conditions and the mechanical conditions of piston are obtained. Under the condition of mechanical load and thermal load playing, the stress and strain of original engine is simulated and analyzed. Stress concentration and weak structure of original engine is found. The parameter of piston structure is optimized and the optimizations are put forward and analyzed to verify the optimizations' effectiveness. These provide a reference for the digital modeling and numerical analysis to solver engin
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Xiong, Zhe, Xiao-Hui Li, Jing-Chang Liang, and Li-Juan Li. "A Multi-Objective Hybrid Algorithm for Optimization of Grid Structures." International Journal of Applied Mechanics 10, no. 01 (2018): 1850009. http://dx.doi.org/10.1142/s1758825118500096.

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In this study, a novel multi-objective hybrid algorithm (MHGH, multi-objective HPSO-GA hybrid algorithm) is developed by crossing the heuristic particle swarm optimization (HPSO) algorithm with a genetic algorithm (GA) based on the concept of Pareto optimality. To demonstrate the effectiveness of the MHGH, the optimizations of four unconstrained mathematical functions and four constrained truss structural problems are tested and compared to the results using several other classic algorithms. The results show that the MHGH improves the convergence rate and precision of the particle swarm optimi
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Wan, Zhi-Qiang, Xiao-Zhe Wang, and Chao Yang. "Integrated aerodynamics/structure/stability optimization of large aircraft in conceptual design." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 232, no. 4 (2017): 745–56. http://dx.doi.org/10.1177/0954410016687143.

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The multidisciplinary design optimization is suitable for modern large aircraft, and it has the potential in conceptual phase of aircraft design especially. An integrated optimization method considering the disciplines of aerodynamics, structure and stability for large aircraft design in conceptual phase is presented. The objective is the minimum stiffness of a beam-frame wing structure subject to aeroelasticity, aerodynamics, and stability constraints. The aeroelastic responses are computed by commercial software MSC. Nastran, and the cruise stability is evaluated by the linear small-disturba
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9

López, Luis Fernando de Mingo, Francisco Serradilla García, José Eugenio Naranjo Hernández, and Nuria Gómez Blas. "Speed Proportional Integrative Derivative Controller: Optimization Functions in Metaheuristic Algorithms." Journal of Advanced Transportation 2021 (November 3, 2021): 1–12. http://dx.doi.org/10.1155/2021/5538296.

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Recent advancements in computer science include some optimization models that have been developed and used in real applications. Some metaheuristic search/optimization algorithms have been tested to obtain optimal solutions to speed controller applications in self-driving cars. Some metaheuristic algorithms are based on social behaviour, resulting in several search models, functions, and parameters, and thus algorithm-specific strengths and weaknesses. The present paper proposes a fitness function on the basis of the mathematical description of proportional integrative derivate controllers sho
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10

Nowak, M. "Improved aeroelastic design through structural optimization." Bulletin of the Polish Academy of Sciences: Technical Sciences 60, no. 2 (2012): 237–40. http://dx.doi.org/10.2478/v10175-012-0031-8.

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Abstract. The paper presents the idea of coupled multiphysics computations. It shows the concept and presents some preliminary results of static coupling of structural and fluid flow codes as well as biomimetic structural optimization. The model for the biomimetic optimization procedure was the biological phenomenon of trabecular bone functional adaptation. Thus, the presented structural bio-inspired optimization system is based on the principle of constant strain energy density on the surface of the structure. When the aeroelastic reactions are considered, such approach allows fulfilling the
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11

Zhao, Yi, Jianxiao Ma, Linghong Shen, and Yong Qian. "Optimizing the Junction-Tree-Based Reinforcement Learning Algorithm for Network-Wide Signal Coordination." Journal of Advanced Transportation 2020 (February 21, 2020): 1–11. http://dx.doi.org/10.1155/2020/6489027.

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This study develops three measures to optimize the junction-tree-based reinforcement learning (RL) algorithm, which will be used for network-wide signal coordination. The first measure is to optimize the frequency of running the junction-tree algorithm (JTA) and the intersection status division. The second one is to optimize the JTA information transmission mode. The third one is to optimize the operation of a single intersection. A test network and three test groups are built to analyze the optimization effect. Group 1 is the control group, group 2 adopts the optimizations for the basic param
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12

Zhai, Shou, Bo Jin, and Yilu Cheng. "Mechanical Design and Gait Optimization of Hydraulic Hexapod Robot Based on Energy Conservation." Applied Sciences 10, no. 11 (2020): 3884. http://dx.doi.org/10.3390/app10113884.

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Minimizing energy consumption is significant for the hydraulic walking robot to reduce its power unit weight and increase working hours. However, most robot leg designs are inefficient due to their bio-mimetic or mission-specific mechanical structure. This paper presents a structural optimization method of the hydraulic walking robot by optimizing its mechanical structure and gait parameters simultaneously. The mathematical model of the total power of the hydraulic hexapod robot (HHR) is established, which is derived based on a general template for designing the hydraulic walking robot. The ar
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Arasteh, Ehsan, and Francis Assadian. "A Comparative Analysis of Brake-by-Wire Smart Actuators Using Optimization Strategies." Energies 15, no. 2 (2022): 634. http://dx.doi.org/10.3390/en15020634.

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Since the automotive industry is shifting towards electrification, brake-by-wire technologies are becoming more prevalent. However, there has been little research comparing and optimizing brake-by-wire actuators in terms of their energy expenditure and response time. This paper investigates the comparison of three different smart brake-by-wire actuators, Electro-Hydraulic Brakes (EHB), Electro-Mechanical Brakes (EMB), and Electronic Wedge Brakes (EWB), first by defining an objective metric and then using both linear and nonlinear optimization techniques. Modeling of the actuators is performed
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14

Li, Q., Ji Hong Zhu, Y. H. Zhang, and W. H. Zhang. "The Topology Optimization of Ceramic-Resin Composite Structure under Thermal and Mechanical Loads." Applied Mechanics and Materials 341-342 (July 2013): 124–28. http://dx.doi.org/10.4028/www.scientific.net/amm.341-342.124.

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The ceramic-resin composite structure is generally used as the investment casting pattern. Due to the coefficient of thermal expansion (CTE) of resin is higher than that of ceramic, the thermal expansion of the resin pattern will lead to the crack of the ceramic shell during the burnout procedure. Simultaneously, the stiffness of the whole structure should be maintained at a certain level. In this paper, topology optimizations with respect to the cavity configuration of the resin pattern were developed to find out the optimal designs. A method involves the assist element was also introduced to
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15

Salicio-Paz, Asier, Ixone Ugarte, Jordi Sort, Eva Pellicer, and Eva García-Lecina. "Full Optimization of an Electroless Nickel Solution: Boosting the Performance of Low-Phosphorous Coatings." Materials 14, no. 6 (2021): 1501. http://dx.doi.org/10.3390/ma14061501.

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Univariate and multivariate optimizations of a novel electroless nickel formulation have been carried out by means of the Taguchi method. From the compositional point of view, adjustment of the complexing agent concentration in solution is crucial for fine-tuning free Ni2+ ions concentration and, in turn, the mechanical properties of the resulting coatings. The Ni (II) concentration and the pH are the main parameters which help restrict the incorporation of phosphorous into the Ni layers. On the other hand, the stirring rate, the pH and the reducing agent concentration are the most influential
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16

Yin, Jian, Qiang Hao, Yu Liu, Shengfang Zhang, and Zhihua Sha. "Multiobjective optimization of internal and surface structure of high-speed and heavy-duty brake disc." Advances in Mechanical Engineering 14, no. 1 (2022): 168781402110704. http://dx.doi.org/10.1177/16878140211070459.

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The brake disc plays a crucial role to keep the stable braking of a high-speed and heavy-duty disc brake. There is always high temperature, brake vibration, and even serious deformation under braking pressure and frictional resistance. To improve brake performance, this paper aims to find new internal and surface structures of the brake disc. An equivalent moving load (EML) topology optimization method for internal structure is proposed. Topography optimization method oriented to displacement and stress control for surface structure is carried out. Multiobjective functions containing thermal-s
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17

Han, Ding, Tang Jin-yuan, Zhou Zhen-yu, and Cui Wei. "Tooth flank reconstruction and optimizations after simulation process modeling for the spiral bevel gear." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 13 (2015): 2260–72. http://dx.doi.org/10.1177/0954406215592922.

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Tooth flank reconstruction and optimization methodologies after simulation process modeling are presented, in order to provide accurate model and tooth data for digitized design and manufacture of the spiral bevel gear. Firstly, a simulation process modeling utilizing universal machine settings is developed for an initial solid model. Then, due to its poor accuracy, tooth flank reconstruction exploiting the Non-Uniform B-Spline fitting method is carried out. Finally, some tooth flank optimizations are introduced for higher tooth flank precision and accurate tooth data: (1) Overall tooth flank
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18

Zhou, Chen, Zhijin Wang, and Paul M. Weaver. "Thermal-Mechanical Optimization of Folded Core Sandwich Panels for Thermal Protection Systems of Space Vehicles." International Journal of Aerospace Engineering 2017 (2017): 1–12. http://dx.doi.org/10.1155/2017/3030972.

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The integrated thermal protection system (ITPS) is a complicated system that addresses both mechanical and thermal considerations. An M-pattern folded core sandwich panel packed with low-density insulation material provides inherently low mass for a potential ITPS panel. Herein, we identify the most influential geometric parameters and establish a viable, computationally efficient optimization procedure. Variables considered for optimization are geometric dimensions of the ITPS, while temperature and deflection are taken as constraints. A one-dimensional (1D) thermal model based on a modified
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19

Wu, Wei-Guo, Fu-Rui Xiong, Jian-Qiao Sun, and Yong-Gang Leng. "Dynamic modeling of aircraft landing gear and multi-objective optimization with simple cell mapping method." Transactions of the Canadian Society for Mechanical Engineering 43, no. 1 (2019): 80–91. http://dx.doi.org/10.1139/tcsme-2017-0083.

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To study the dynamic characteristics of aircraft landing gear and carry out successive optimizations, a mathematical model of flexible landing gear is established by the Hamiltonian principle. The dynamic model includes a tire force estimation derived from the impact model. Dynamic analysis with the flexible model is then conducted. Stress distribution is obtained from the dynamic analysis, which can be used for fatigue analysis, optimization design, etc. To achieve better dynamic characteristics in terms of vibration reduction, a multi-objective optimization problem is formulated and solved v
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20

Li, H. D., and L. He. "Toward Intra-Row Gap Optimization for One and Half Stage Transonic Compressor." Journal of Turbomachinery 127, no. 3 (2005): 589–98. http://dx.doi.org/10.1115/1.1928934.

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Multistage effects on both aerodynamics and aeromechanics have been identified as significant. Thus, design optimizations for both aerodynamic performance and aeromechanical stability should be done in the unsteady multistage environment. The key issue preventing such a procedure to be carried out is the enormous computing time cost of multistage unsteady simulations. In this paper, a methodology based on the single-passage shape-correction method integrated with an interface disturbance truncation technique has been developed. The capability, efficiency, and accuracy of the developed methodol
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21

Céa, Jean, Stéphane Garreau, Philippe Guillaume, and Mohamed Masmoudi. "The shape and topological optimizations connection." Computer Methods in Applied Mechanics and Engineering 188, no. 4 (2000): 713–26. http://dx.doi.org/10.1016/s0045-7825(99)00357-6.

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22

Chen, H., and N. C. Baines. "Analytical Optimization Design of Radial and Mixed Flow Turbines." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 206, no. 3 (1992): 177–87. http://dx.doi.org/10.1243/pime_proc_1992_206_028_02.

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The optimization of radial and mixed flow turbine design, based on simple one-dimensional aerodynamic principles, is described. The objective is to minimize energy losses by reducing the inlet and exit velocities of the rotor. The procedure is based on the specification of a loading coefficient. Previous work has shown that turbines of this type have loading coefficients that lie in a narrow band, and so suitable values can be readily determined. A more detailed specification of losses is unnecessary for the optimization. Optimizations are described for zero and non-zero inlet blade angles, an
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23

Weber, Tobias A., Jan-Christoph Arent, Lucas Steffens, Johannes M. Balvers, and Miro Duhovic. "Thermal optimization of composite autoclave molds using the shift factor approach for boundary condition estimation." Journal of Composite Materials 51, no. 12 (2017): 1753–67. http://dx.doi.org/10.1177/0021998317699868.

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Thermal optimization of autoclave molds is essential to increase part quality, reduce manufacturing costs and increase autoclave capacity. Previous experience-based tooling designs allowed an optimization only after the mold was manufactured and tested. Manufacturing process simulation provides the capability for virtual tooling optimization within the design phase. Thereby, the range of possible optimizations increases and the tooling cost decreases. In order to use manufacturing process simulation efficiently, fast but accurate simulation methods must be available. The so-called shift factor
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24

Item, Cem C., and Oktay Baysal. "Wing Section Optimization for Supersonic Viscous Flow." Journal of Fluids Engineering 120, no. 1 (1998): 102–8. http://dx.doi.org/10.1115/1.2819632.

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To improve the performance of a highly swept supersonic wing, it is desirable to have an automated design method that also includes a higher fidelity to the flow physics. With this impetus, an aerodynamic optimization methodology incorporating the thin-layer Navier-Stokes equations and sensitivity analysis had previously been developed. Prior to embarking upon the full wing design task, the present investigation concentrated on the identification of effective optimization problem formulations and testing the feasibility of the employed methodology, by defining two-dimensional test cases. Start
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Tao, Ran, Ruofu Xiao, Di Zhu, and Fujun Wang. "Multi-objective optimization of double suction centrifugal pump." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 6 (2017): 1108–17. http://dx.doi.org/10.1177/0954406217699020.

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Double suction centrifugal pumps are widely used for water supplying system. In this study, the original design of a double centrifugal pump lacked sufficient head at the design flow rate condition. Therefore, the most important objective was to optimize the design to improve the head. A strategy inspired by “liquid–gas cavitation process” is innovatively used for intelligent global search of better pump designs with both higher head and wider-higher efficiency. This strategy has advantages including flexibility, parallelism, and feasibility on overstepping the local-best. The computational fl
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26

Yoshimura, Masataka, Masahiko Taniguchi, Kazuhiro Izui, and Shinji Nishiwaki. "Hierarchical Arrangement of Characteristics in Product Design Optimization." Journal of Mechanical Design 128, no. 4 (2005): 701–9. http://dx.doi.org/10.1115/1.2198256.

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This paper proposes a machine product design optimization method based on the decomposition of performance characteristics, or alternatively, extraction of simpler characteristics, that is especially responsive to the detailed features or difficulties presented by specific design problems. The optimization problems examined here are expressed using hierarchical constructions of the decomposed and extracted characteristics and the optimizations are sequentially repeated, starting with groups of characteristics having conflicting characteristics at the lowest hierarchical level and proceeding to
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27

Batay, Sagidolla, Bagdaulet Kamalov, Dinmukhamed Zhangaskanov, et al. "Adjoint-Based High-Fidelity Concurrent Aerodynamic Design Optimization of Wind Turbine." Fluids 8, no. 3 (2023): 85. http://dx.doi.org/10.3390/fluids8030085.

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To evaluate novel turbine designs, the wind energy sector extensively depends on computational fluid dynamics (CFD). To use CFD in the design optimization process, where lower-fidelity approaches such as blade element momentum (BEM) are more popular, new tools to increase the accuracy must be developed as the latest wind turbines are larger and the aerodynamics and structural dynamics become more complex. In the present study, a new concurrent aerodynamic shape optimization approach towards multidisciplinary design optimization (MDO) that uses a Reynolds-averaged Navier–Stokes solver in conjun
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28

Gong, Yunyi, Yoshitsugu Otomo, and Hajime Igarashi. "Multi-objective topology optimization of magnetic couplers for wireless power transfer." International Journal of Applied Electromagnetics and Mechanics 64, no. 1-4 (2020): 325–33. http://dx.doi.org/10.3233/jae-209337.

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In this paper, the multi-objective topology optimizations of wireless power transfer (WPT) devices with two different coil geometries are proposed for obtaining the designs with good balance between transfer efficiency and safety. For this purpose, the proposed method adopts the normalized Gaussian network (NGnet) and Non-dominated Sorting Genetic Algorithm II (NSGA-II). In addition, the optimization under the different constraint on ferrite volume is carried out to verify its influence on optimization results. It has been shown that the proposed method successfully provides the Pareto solutio
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29

Antonova, Valeria, Stanislav Alekseev, Aleksei Tarasov, Natalia Scheglova, Oleg Klyavin, and Aleksei Borovkov. "Analysis and use of SIMP method in optimization of a car hood design." E3S Web of Conferences 140 (2019): 04017. http://dx.doi.org/10.1051/e3sconf/201914004017.

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The article shows the relevance of creating digital twins and conducting topological and topographic optimizations as part of improving the physical and mechanical properties of car parts using the example of a car hood. A description of the existing optimization methods is given and the principle of the SIMP method is described. The results of optimizing the design of the hood of the car using this method are presented. We demonstrate that using modern approaches to modelling and optimization of automobile parts makes it possible to achieve targets in the design and redesign, to achieve suffi
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Mahbod, Mahshid, Masoud Asgari, and Christian Mittelstedt. "Architected functionally graded porous lattice structures for optimized elastic-plastic behavior." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 234, no. 8 (2020): 1099–116. http://dx.doi.org/10.1177/1464420720923004.

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In this paper, the elastic–plastic mechanical properties of regular and functionally graded additively manufactured porous structures made by a double pyramid dodecahedron unit cell are investigated. The elastic moduli and also energy absorption are evaluated via finite element analysis. Experimental compression tests are performed which demonstrated the accuracy of numerical simulations. Next, single and multi-objective optimizations are performed in order to propose optimized structural designs. Surrogated models are developed for both elastic and plastic mechanical properties. The results s
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Li, Zhongkai, Guangdong Tian, Gang Cheng, Houguang Liu, and Zhihong Cheng. "An integrated cultural particle swarm algorithm for multi-objective reliability-based design optimization." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 228, no. 7 (2013): 1185–96. http://dx.doi.org/10.1177/0954406213502589.

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Uncertainties in design variables and problem parameters are often inevitable in multi-objective optimizations, and they must be considered in an optimization task if reliable Pareto optimal solutions are to be sought. Multi-objective reliability-based design optimization has been raised as a question in design for reliability, but the disadvantages of fixed evolutionary parameters, nonuniformly distributed Pareto optimal solutions and high computational cost hinder engineering applications of reliability-based design. To deal with it, this work proposes an integrated multi-objective cultural-
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Yang, Wenjia, S. L. Ho, and Shiyou Yang. "A vector wind driven optimization algorithm for multi-objective optimizations of electromagnetic devices." International Journal of Applied Electromagnetics and Mechanics 59, no. 1 (2019): 55–62. http://dx.doi.org/10.3233/jae-171186.

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Yang, Fan, Zhufeng Yue, Lei Li, and Weizhu Yang. "Aerodynamic optimization method based on Bezier curve and radial basis function." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 232, no. 3 (2016): 459–71. http://dx.doi.org/10.1177/0954410016679433.

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Aerodynamic design is of great importance in the overall design of flight vehicles. In this study, an approach to aerodynamic design optimization is proposed by integrating Bezier curve parameterization and radial basis interpolation to enable large variation of aerodynamic profile during optimization. The Bezier curve uses the shape of a given airfoil and the radial basis function interpolation is applied to smoothly transfer the perturbation to the mesh in the whole flow field. Using design of experiments technique, the prominent design parameters that significantly affect the aerodynamic pe
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Zhang, Zhi-yong, Xin Liu, Cai-xia Huang, and Da Pan. "Noise source identification for industrial sewing machines based on non-linear partial least squares regression model." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 16 (2016): 2817–27. http://dx.doi.org/10.1177/0954406215602280.

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This paper introduces an application of non-linear partial least squares for vibro-acoustic regression modeling and for an industrial sewing machine. In the vibro-acoustic regression model, the vibration accelerations of reference points are defined as explanatory variables, while the noise sound pressure of target points is defined as response variables, and the number of explanatory variables is determined initially by a correlation analysis in the time domain. To improve predictive accuracy while a non-linear relationship exists between the explanatory and response variables, the explanator
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Mashkovtsev, Denis, Wataru Mizukami, Jacek Korchowiec, Anna Stachowicz‐Kuśnierz, and Yuriko Aoki. "Elongation method with intermediate mechanical and electrostatic embedding for geometry optimizations of polymers." Journal of Computational Chemistry 41, no. 25 (2020): 2203–12. http://dx.doi.org/10.1002/jcc.26389.

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Kim, Taekyun, Jihoon Kim, and Tae Hee Lee. "Structure-Circuit Resistor Integrated Design Optimization of Piezoelectric Energy Harvester Considering Stress Constraints." Energies 16, no. 9 (2023): 3766. http://dx.doi.org/10.3390/en16093766.

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A piezoelectric energy harvester (PEH) transduces mechanical energy into electrical energy, which can be utilized as an energy source for self-powered or low-power devices. Therefore, maximizing the power of a PEH is a crucial design objective. It is well known that structural designs are firstly conducted for controlling resonance characteristics, and then circuit designs are pursued through impedance matching for improving power. However, a PEH contains solid mechanics, electrostatics, and even a circuit-coupled multi-physics system. Therefore, this research aims to design a PEH considering
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Frost, T. H., B. Agnew, and A. Anderson. "Optimizations for Brayton-Joule Gas Turbine Cycles." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 206, no. 4 (1992): 283–88. http://dx.doi.org/10.1243/pime_proc_1992_206_045_02.

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Traditionally, the simple Brayton–Joule cycle has been optimized for maximum output and for minimum compressor work with inter-cooling and maximum turbine work with reheat. To these Woods et al. (1) have added optimization for peak efficiency of the simple cycle with internal irreversibilities. The results now presented include both maximum output and peak efficiency for both regenerative and intercool/reheat cycles with internal irreversibilities. Two special cases, for a regenerative cycle and for a non-regenerative cycle with both reheat and intercooling, are identified where the conditions
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Zhao, Lingying, Min Ye, and Xinxin Xu. "Intelligent optimization of EV comfort based on a cooperative braking system." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 235, no. 10-11 (2021): 2904–16. http://dx.doi.org/10.1177/09544070211004461.

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To address the comfort of an electric vehicle, a coupling mechanism between mechanical friction braking and electric regenerative braking was studied. A cooperative braking system model was established, and comprehensive simulations and system optimizations were carried out. The performance of the cooperative braking system was analyzed. The distribution of the braking force was optimized by an intelligent method, and the distribution of a braking force logic diagram based on comfort was proposed. Using an intelligent algorithm, the braking force was distributed between the two braking systems
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An, Haichao, Shenyan Chen, Yanjie Liu, and Hai Huang. "Optimal design of the stacking sequences of a corrugated central cylinder in a satellite." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 233, no. 2 (2016): 239–53. http://dx.doi.org/10.1177/1464420716672097.

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This Case Study is to describe an application of a two-level approximation method in optimally determining the stacking sequences of a practical corrugated central cylinder. Being housed in the center of a practical satellite, this cylinder can support many of the structural components and functional devices in the satellite. For the purpose of reducing its mass meanwhile maintaining good mechanical properties, the stacking sequences of this cylinder are to be optimally designed under given constraints in this paper. To address this problem, an optimization model was first established by minim
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Messai, Hala, Salim Meziani, and Athmane Fouathia. "The prediction of the cyclic mechanical behavior of stainless steel 304L at room temperature." World Journal of Engineering 18, no. 5 (2021): 675–83. http://dx.doi.org/10.1108/wje-07-2020-0259.

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Purpose The purpose of this paper is to highlight the performance of the Chaboche model in relation to the database identification, tests with imposed deformations were conducted at room temperature on 304L stainless steel specimens. Design/methodology/approach The first two tests were performed in tension-compression between ±0.005 and ±0.01; in the third test, each cycle is composed of the combination of a compression tensile cycle between ±0.01 followed by a torsion cycle between ±0.01723 (non-proportional path), and the last, uniaxial ratcheting test with a mean stress between 250 MPa and
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Li, Xiaoyong, Xiao Chai, and Hong Liu. "Conceptual design optimization of a wide-body commercial aircraft using a competitiveness model." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 234, no. 2 (2019): 208–20. http://dx.doi.org/10.1177/0954410019862082.

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The conceptual design optimization of wide-body commercial aircraft is very challenging today. This paper deals with the conceptual design optimization problem of a next-cycle wide-body commercial aircraft, which has many similarities to the one being co-developed by China and Russia. The most difficult weaknesses are that the design requirements cannot be traded off during the conceptual design optimization process. To overcome this issue, a competitiveness model is built up for the wide-body commercial aircraft. The analytic hierarchy process is applied to formulate the competitiveness model
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Dinner, P. J., and H. Yoshida. "ITER fuel cycle options and optimizations." Fusion Engineering and Design 16 (December 1991): 11–22. http://dx.doi.org/10.1016/0920-3796(91)90179-t.

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Leal, Pedro BC, Marcelo A. Savi, and Darren J. Hartl. "Aero-structural optimization of shape memory alloy-based wing morphing via a class/shape transformation approach." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 232, no. 15 (2017): 2745–59. http://dx.doi.org/10.1177/0954410017716193.

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Because of the continuous variability of the ambient environment, all aircraft would benefit from an in situ optimized wing. This paper proposes a method for preliminary design of feasible morphing wing configurations that provide benefits under disparate flight conditions but are also each structurally attainable via localized active shape change operations. The controlled reconfiguration is accomplished in a novel manner through the use of shape memory alloy embedded skin components. To address this coupled optimization problem, multiple sub-optimizations are required. In this work, the opti
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Song, Yi, Zhou Yi Wang, Ai Hong Ji, and Zhen Dong Dai. "Mechanical Performance Tests of Bamboo Beetles Otidognathus davidis fairs' Abdominal Shells." Applied Mechanics and Materials 461 (November 2013): 241–46. http://dx.doi.org/10.4028/www.scientific.net/amm.461.241.

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The biomaterials with excellent properties such as high strength-weights ratio and so on will inspire inspirations about bionic composite materials to satisfy the scalding hypercriticisms for aerial materials. The investigations of biomaterial mechanical performances are of great advantages in bionic designs and bionic manufactures. The mechanical performances of Bamboo BeetlesOtidognathus Davidis Fairs abdominal shells were tested with a nanoindenter in this paper. The experiments results demonstrated that the harnesses and modulus are different at different test areas. The mechanical perform
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Murphy, Ryan, Chikwesiri Imediegwu, Robert Hewson, and Matthew Santer. "Multiscale structural optimization with concurrent coupling between scales." Structural and Multidisciplinary Optimization 63, no. 4 (2021): 1721–41. http://dx.doi.org/10.1007/s00158-020-02773-3.

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AbstractA robust three-dimensional multiscale structural optimization framework with concurrent coupling between scales is presented. Concurrent coupling ensures that only the microscale data required to evaluate the macroscale model during each iteration of optimization is collected and results in considerable computational savings. This represents the principal novelty of this framework and permits a previously intractable number of design variables to be used in the parametrization of the microscale geometry, which in turn enables accessibility to a greater range of extremal point propertie
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Cota, Luis Guillermo, and Pablo de la Mora. "On the structure of lithium peroxide, Li2O2." Acta Crystallographica Section B Structural Science 61, no. 2 (2005): 133–36. http://dx.doi.org/10.1107/s0108768105003629.

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The two published lithium peroxide structures, both ascribed to the hexagonal P\bar 6 space group, were subjected to reinterpretation, and another more symmetric structure, now belonging to the P63/mmc space group, was found. Detailed density-functional quantum mechanical calculations and crystal structure optimizations were carried out on both structures and the energetic arguments obtained therewith helped to rule out one of them.
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Yin, Qiaozhi, Hong Nie, Xiaohui Wei, and Ming Zhang. "Aircraft electric anti-skid braking and combined direction control system using co-simulation and experimental methods." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 234, no. 2 (2019): 173–91. http://dx.doi.org/10.1177/0954410019852825.

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The work reported in this paper concentrates on the design and application of an electric ground control system combining the braking and steering mechanisms on a small unmanned aerial vehicle. A virtual prototype of a small unmanned aerial vehicle is built with a multibody dynamic software LMS Virtual.Lab Motion. An electric anti-skid braking system and a new combined direction control system considering the sensors models are established with MATLAB/Simulink. Optimizations are carried out using a global optimization command patternsearch first and then a local optimization method fminsearch
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Zhou, Zaiwei, Nuo Chen, Hongchuan Zhong, et al. "Textile-Based Mechanical Sensors: A Review." Materials 14, no. 20 (2021): 6073. http://dx.doi.org/10.3390/ma14206073.

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Innovations related to textiles-based sensors have drawn great interest due to their outstanding merits of flexibility, comfort, low cost, and wearability. Textile-based sensors are often tied to certain parts of the human body to collect mechanical, physical, and chemical stimuli to identify and record human health and exercise. Until now, much research and review work has been carried out to summarize and promote the development of textile-based sensors. As a feature, we focus on textile-based mechanical sensors (TMSs), especially on their advantages and the way they achieve performance opti
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Todoroki, Akira, Kentarou Suenaga, and Yoshinobu Shimamura. "Stacking sequence optimizations using modified global response surface in lamination parameters." Advanced Composite Materials 12, no. 1 (2003): 35–55. http://dx.doi.org/10.1163/156855103322320365.

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Padhy, Chinmaya, and Pariniti Singh. "Optimization of Machining Parameters using Taguchi Coupled Grey Relational Approach while Turning Inconel 625." Journal of Mechanical Engineering 18, no. 2 (2021): 161–76. http://dx.doi.org/10.24191/jmeche.v18i2.15151.

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In manufacturing industries preparation of quality surfaces is very important. The surface roughness will influence the quality and effectiveness of the subsequent coatings for protection against corrosion, wear resistance etc. For achieving desired surface roughness, factors like cutting force (N) and material removal rate (mm3/sec) plays an important role towards final product optimization. This study helps to determine the contribution of each machining parameters [cutting speed (v), feed rate (f) and depth-of-cut (d)] and their interaction to investigate their optimum values during dry tur
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