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  Subjects -> ENGINEERING (Total: 2173 journals)
    - CHEMICAL ENGINEERING (183 journals)
    - CIVIL ENGINEERING (171 journals)
    - ELECTRICAL ENGINEERING (95 journals)
    - ENGINEERING (1173 journals)
    - HYDRAULIC ENGINEERING (55 journals)
    - INDUSTRIAL ENGINEERING (57 journals)
    - MECHANICAL ENGINEERING (81 journals)

CIVIL ENGINEERING (171 journals)                  1 2     

ACI Structural Journal     Full-text available via subscription   (Followers: 9)
Acta Polytechnica : Journal of Advanced Engineering     Open Access  
Acta Structilia : Journal for the Physical and Development Sciences     Open Access   (Followers: 2)
Advances in Civil Engineering     Open Access   (Followers: 30)
Advances in Structural Engineering     Full-text available via subscription   (Followers: 18)
Ambiente Construído     Open Access   (Followers: 2)
American Journal of Civil Engineering and Architecture     Open Access   (Followers: 22)
Architectural Engineering     Open Access   (Followers: 6)
Archives of Civil Engineering     Open Access   (Followers: 8)
Archives of Hydro-Engineering and Environmental Mechanics     Open Access   (Followers: 2)
ATBU Journal of Environmental Technology     Open Access   (Followers: 2)
Australian Journal of Structural Engineering     Full-text available via subscription   (Followers: 5)
Baltic Journal of Road and Bridge Engineering     Full-text available via subscription   (Followers: 3)
BER : Building and Construction : Full Survey     Full-text available via subscription   (Followers: 10)
BER : Building Contractors' Survey     Full-text available via subscription   (Followers: 4)
BER : Building Sub-Contractors' Survey     Full-text available via subscription   (Followers: 3)
BER : Survey of Business Conditions in Building and Construction : An Executive Summary     Full-text available via subscription   (Followers: 4)
Berkeley Planning Journal     Open Access   (Followers: 5)
Bioinspired Materials     Open Access   (Followers: 1)
Bridge Structures : Assessment, Design and Construction     Hybrid Journal   (Followers: 15)
Building and Environment     Hybrid Journal   (Followers: 14)
Building Women     Full-text available via subscription  
Built Environment Project and Asset Management     Hybrid Journal   (Followers: 16)
Canadian Journal of Civil Engineering     Full-text available via subscription   (Followers: 15)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 4)
Case Studies in Nondestructive Testing and Evaluation     Open Access   (Followers: 1)
Case Studies in Structural Engineering     Open Access  
Cement and Concrete Composites     Hybrid Journal   (Followers: 12)
Change Over Time     Full-text available via subscription   (Followers: 4)
Civil and Environmental Engineering     Open Access   (Followers: 2)
Civil And Environmental Engineering Reports     Open Access   (Followers: 1)
Civil and Environmental Research     Open Access   (Followers: 16)
Civil Engineering     Hybrid Journal   (Followers: 13)
Civil Engineering = Siviele Ingenieurswese     Full-text available via subscription   (Followers: 5)
Civil Engineering and Architecture     Open Access   (Followers: 5)
Civil Engineering and Environmental Systems     Hybrid Journal   (Followers: 5)
Civil Engineering and Technology     Open Access   (Followers: 5)
Civil Engineering Dimension     Open Access   (Followers: 5)
Cohesion and Structure     Full-text available via subscription   (Followers: 2)
Composite Structures     Hybrid Journal   (Followers: 158)
Computer-aided Civil and Infrastructure Engineering     Hybrid Journal   (Followers: 9)
Computers & Structures     Hybrid Journal   (Followers: 26)
Concrete Research Letters     Open Access   (Followers: 2)
Constructii : Journal of Civil Engineering Research     Open Access   (Followers: 10)
Construction Engineering     Open Access   (Followers: 4)
Construction Management and Economics     Hybrid Journal   (Followers: 30)
Construction Science     Open Access   (Followers: 1)
Constructive Approximation     Hybrid Journal  
Curved and Layered Structures     Open Access  
DFI Journal : The Journal of the Deep Foundations Institute     Hybrid Journal  
Earthquake Engineering and Structural Dynamics     Hybrid Journal   (Followers: 13)
Enfoque UTE     Open Access   (Followers: 1)
Engineering Project Organization Journal     Hybrid Journal   (Followers: 5)
Engineering Structures     Hybrid Journal   (Followers: 14)
Engineering Structures and Technologies     Hybrid Journal   (Followers: 2)
Engineering, Construction and Architectural Management     Hybrid Journal   (Followers: 16)
Environmental Geotechnics     Open Access   (Followers: 2)
European Journal of Environmental and Civil Engineering     Hybrid Journal   (Followers: 5)
Fatigue & Fracture of Engineering Materials and Structures     Hybrid Journal   (Followers: 14)
Frattura ed Integrità Strutturale : Fracture and Structural Integrity     Open Access  
Frontiers in Built Environment     Open Access  
Frontiers of Structural and Civil Engineering     Hybrid Journal   (Followers: 6)
Geomaterials     Open Access   (Followers: 2)
Geosystem Engineering     Hybrid Journal   (Followers: 3)
Geotechnik     Hybrid Journal   (Followers: 1)
Géotechnique Letters     Hybrid Journal   (Followers: 4)
HBRC Journal     Open Access   (Followers: 2)
Hormigón y Acero     Full-text available via subscription  
HVAC&R Research     Hybrid Journal   (Followers: 1)
Indoor and Built Environment     Hybrid Journal   (Followers: 2)
Infrastructure Asset Management     Full-text available via subscription  
Ingenio Magno     Open Access  
Insight - Non-Destructive Testing and Condition Monitoring     Full-text available via subscription   (Followers: 8)
International Journal for Service Learning in Engineering     Open Access  
International Journal of 3-D Information Modeling     Full-text available via subscription   (Followers: 1)
International Journal of Advanced Structural Engineering     Open Access   (Followers: 6)
International Journal of Concrete Structures and Materials     Open Access   (Followers: 8)
International Journal of Condition Monitoring     Full-text available via subscription  
International Journal of Construction Engineering and Management     Open Access   (Followers: 6)
International Journal of Geosynthetics and Ground Engineering     Full-text available via subscription   (Followers: 1)
International Journal of Protective Structures     Full-text available via subscription   (Followers: 6)
International Journal of Steel Structures     Hybrid Journal   (Followers: 4)
International Journal of Structural Engineering     Hybrid Journal   (Followers: 7)
International Journal of Structural Integrity     Hybrid Journal  
International Journal of Structural Stability and Dynamics     Hybrid Journal   (Followers: 5)
International Journal of Sustainable Built Environment     Open Access   (Followers: 4)
International Journal of Sustainable Construction Engineering and Technology     Open Access   (Followers: 11)
International Journal on Pavement Engineering & Asphalt Technology     Open Access   (Followers: 2)
Journal of Accessibility and Design for All     Open Access   (Followers: 6)
Journal of Advanced Research in Civil and Environmental Engineering     Open Access   (Followers: 1)
Journal of Bridge Engineering     Full-text available via subscription   (Followers: 18)
Journal of Building Engineering     Hybrid Journal  
Journal of Building Materials and Structures     Open Access  
Journal of Building Performance Simulation     Hybrid Journal   (Followers: 5)
Journal of Civil Engineering and Construction Technology     Open Access   (Followers: 3)
Journal of Civil Engineering and Management     Hybrid Journal   (Followers: 7)
Journal of Civil Engineering and Science     Open Access   (Followers: 13)
Journal of Civil Engineering Research     Open Access   (Followers: 12)
Journal of Civil Society     Hybrid Journal   (Followers: 3)
Journal of Civil Structural Health Monitoring     Hybrid Journal   (Followers: 3)

        1 2     

Journal Cover   Structural and Multidisciplinary Optimization
  [SJR: 1.825]   [H-I: 61]   [6 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1615-1488 - ISSN (Online) 1615-147X
   Published by Springer-Verlag Homepage  [2280 journals]
  • Drilling optimization of woven CFRP laminates under different tool wear
           conditions: a multi-objective design of experiments approach
    • Abstract: Abstract The cutting tool geometry is known to be an influential factor on damage induced during drilling of composite materials. Conversely, the geometry of the tool is affected under multiple drilling cycles due to highly abrasive nature of fibers. Building on earlier reports, the aim of this work is to create a better understanding of cutting parameters on the quality of drilled woven carbon fiber reinforced polymer (CFRP) laminates, given different tool wear conditions. Namely, a full factorial design of experiments has been conducted to quantify the significance of each process parameter (cutting velocity, feed rate and tool point angle), as well as their interactions, on the generation of entry- and exist- delaminations as well as the thrust force for different tool types. Finally, using a response surface methodology, a multi-objective optimization strategy has been presented to select optimum ranges of design parameters that can minimize the aforementioned output variables collectively. Such knowledge may be useful to explore further improvements toward defect-free drilling of woven CFRP composites.
      PubDate: 2015-10-06
  • Stress-based design of thermal structures via topology optimization
    • Abstract: Abstract The design of thermal structures in the aerospace industry, including exhaust structures on embedded engine aircraft and hypersonic thermal protection systems, poses a number of complex design challenges. These challenges are particularly well addressed by the material layout capabilities of structural topology optimization; however, no topology optimization methods are readily available with the necessary thermoelastic considerations for these problems. This is due in large part to the emphasis on cases of maximum stiffness design for structures subjected to externally applied mechanical loads in the majority of topology optimization applications. In addition, while limited work in the literature has investigated thermoelastic topology optimization, a direct treatment of thermal stresses is not well documented. Such a treatment is critical in the design of thermal structures where excessive thermal stresses are a primary failure mode. In this paper, we present a method for the topology optimization of structures with combined mechanical and thermoelastic (temperature) loads that are subject to stress constraints. We present the necessary steps needed to address both the design-dependent thermal loads and accommodate the challenges of stress-based design criteria. A relaxation technique is utilized to remove the singularity phenomenon in stresses and the large number of stress constraints is handled using a scaled aggregation technique that has been shown previously to satisfy prescribed stress limits in mechanical problems. Finally, the stress-based thermoelastic formulation is applied to two numerical example problems to demonstrate its effectiveness.
      PubDate: 2015-10-06
  • Crashworthiness optimisation of the front-end structure of the lead car of
           a high-speed train
    • Abstract: Abstract To improve the crashworthiness of vehicles, the crashworthiness of the vehicle structure itself has to be optimised. Through the collision analysis of a certain high-speed train, this research found that the front-end structure is most important in the crashworthiness optimisation design of the vehicle; the constitutive material models required for this numerical simulation of an entire vehicle were obtained by performing loading tests at different strain rates; according to the highly non-linear characteristics of the ensuing structural deformation under impact loading, this research used specific energy absorption (SEA) as an objective function to construct a multi-parameter optimisation model of the front-end structure of the vehicle . Based on this, the optimisation analysis was conducted. In the optimisation, the optimal SEA value (3.6988 kJ/kg) of the structure is obtained by 130-step iteration using a modified method of feasible directions (MMFD)—a gradient optimisation method; the optimal value obtained after 101 iterations by applying a direct search method—Hooke-Jeeves (HJ) algorithm is 3.6454 kJ/kg; and the optimal value acquired after 192 iterations of a global optimisation method—adaptive simulated annealing (ASA)—is 3.6132 kJ/kg. Moreover, the optimum results were validated by collision analysis of the optimal structure using a MMFD model. The variation analysis of the structural SEA with each variable show that the optimisation model is able to extend the range of each design variable.
      PubDate: 2015-10-06
  • Professor George Rozvany (1930–2015)
    • PubDate: 2015-09-30
  • Crashworthiness design of vehicle structure with tailor rolled blank
    • Abstract: Abstract Lightweight and crashworthiness design have been two main challenges in the vehicle industry. These two performances often conflict with each other. To not sacrifice vehicle crashworthiness performance when performing vehicle lightweight design, a novel inner part of front longitudinal beam (FLB-inner) structure with a tailor rolled blank (TRB) concept is proposed in this work, and the corresponding design method is also proposed to minimize the weight of FLB-inner. Firstly, a full-scale vehicle finite element model is adopted and experimentally verified. Secondly, the conventional uniform thickness FLB-inner panel is replaced with a TRB structure, herein, the FLB-inner is divided into four segments with different thickness according to the crashworthiness requirements of frontal impact. Then the material constitutive model and finite element modeling for TRB is established. Thirdly, the optimal Latin hypercube sampling (OLHS) technique is used to generate sampling points and the objective and constraints function values are calculated using commercial software LS-DYNA. Based on the simulation results, the ε-SVR surrogate models are constructed. Finally, the artificial bee colony (ABC) algorithm is applied to obtain the optimal thickness distribution of FLB-inner. The results indicated that the weight of the FLB-inner is reduced by 15.21 %, while the crashworthiness is mproved in comparison with the baseline design.
      PubDate: 2015-09-30
  • Adjoint methods of sensitivity analysis for Lyapunov equation
    • Abstract: Abstract The existing direct sensitivity analysis of optimal structural vibration control based on Lyapunov’s second method is computationally expensive when applied to finite element models with a large number of degree-of-freedom and design variables. A new adjoint sensitivity analysis method is proposed in this paper. Using the new method the sensitivity of the performance index, a time integral of a quadratic function of state variables, with respect to all design variables is calculated by solving two Lyapunov matrix equations. In consideration of computational cost reduction, the new adjoint method is further extended to the reduced order model by Guyan method. This makes the method applicable to large finite element models. Two numerical examples demonstrate the accuracy and efficiency of the proposed method.
      PubDate: 2015-09-29
  • A practical multiscale approach for optimization of structural damping
    • Abstract: Abstract A simple and practical multiscale approach suitable for topology optimization of structural damping in a component ready for additive manufacturing is presented. The approach consists of two steps: First, the homogenized loss factor of a two-phase material is maximized. This is done in order to obtain a range of isotropic microstructures that have a connected stiff material phase. Second, the structural damping of the component is maximized using material interpolations based on the homogenized properties of the microstructures. In order to achieve convergence towards a discrete set of material phases in the macroscopic problem, a material interpolation that favors values close to the predefined material densities is introduced.
      PubDate: 2015-09-29
  • Challenges of using topology optimization for the design of pressurized
           stiffened panels
    • Abstract: Abstract Topology optimization has been successfully used in several case studies in aerospace and automotive industries to generate innovative design concepts that lead to weight savings. This motivates the exploration of this new approach for the design of an aircraft flat pressure bulkhead. However, no studies were conducted on this type of structure. Therefore, this paper presents and discusses the challenges associated with the design of flat pressurized plate using topology optimization (SIMP (Solid Isotropic Material with Penalization) method). A simply supported rectangular plate is used as the design case and a typical layout is defined as a comparison basis. The mass of the interpreted design concepts are obtained with a simplified sizing approach taking into consideration stress and displacement constraints. Results show that the topology layout is not unique as is sensitive to optimization parameters. Moreover, the interpretation of the layout is challenging as they are driven by complex interactions. Finally, the performance of the topology design concept is at most comparable with the typical layout and no significant improvement is obtained. The study highlights the importance of performing an extensive topology study in order to better understand the behavior of the design before creating a concept. An improved topology design process is finally proposed in order to provide guidance to industrial designers.
      PubDate: 2015-09-28
  • Robust optimization in determining failure criteria of a planetary gear
           assembly considering fatigue condition
    • Abstract: Abstract The paper presents a computational approach to predict the load withstanding capacity of a planetary gear assembly. The application of Taguchi’s Design of Experiment has been employed for obtaining a linear regression model to predict a nominal safety factor value, indicating the maximum applicable load of the gear assembly based on the chosen input parameters for reducing power transmission failure of the gear assembly leading to better performance during running condition. The application of this approach is to demonstrate the advantage of combining Taguchi’s method for Design of Experiment (DoE) with Computer Aided Engineering (CAE) to reach the desired solution.
      PubDate: 2015-09-27
  • Topology optimization of periodic structures using BESO based on
           unstructured design points
    • Abstract: Abstract A topology optimization method is proposed for periodic structures when unit cells have different geometries and irregular FE meshes. The relationships between the elements and unstructured design points are established according to the Shepard interpolation functions. Then, the BESO method is applied by switching the density of the design points between solid and void iteratively until an optimized solution is achieved. Due to the separation of finite element analysis and design variables, the optimized topology of periodic structures can be clearly described by unstructured design points. Finally, numerical examples are presented to demonstrate the validity and effectiveness of the proposed heuristic method.
      PubDate: 2015-09-26
  • Multi-objective structural robust optimization under stress criteria based
           on mixed plate super-elements and genetic algorithms
    • Abstract: Abstract This paper presents a methodology for the multi-objective (MO) robust optimization of plate structures under stress criteria, based on Mixed Super-Elements (MSEs). The optimization is performed with a classical Genetic Algorithm (GA) method based on Pareto-optimal solutions. It considers antagonist objectives among them stress criteria and thickness parameters distributed along the plate. This work aims at providing fast and efficient objective calculations. Our method is based on the implementation of MSEs for each zone of the plate featured by its own thickness. They are constructed with a Mixed Finite Element Model (MFEM) based on a displacement-stress mechanical formulation, and is enhanced with a sub-structuring modal reduction method in order to reduce the size of each constant thickness MSE. Those methods combined enable a fast and stress-wise efficient structure analysis, which improves the performance of the repetitive GA. A few cases minimizing the mass and the maximum Von Mises stress within a plate structure under dynamic loads put forward the relevance of our method with promising results. For the sake of robustness, both discrete frequencies and frequency bands are studied. The MO optimization is able to satisfy multiple damage criteria with different thickness distributions. It brings simplicity, saves computational time and the Pareto-front presentation with stress objective provides a good overview of the possibilities for the designers.
      PubDate: 2015-09-25
  • Topology optimization of piezo modal transducers with null-polarity phases
    • Abstract: Abstract Piezo modal transducers in 2d can be designed theoretically by tailoring polarity of the surface electrodes. However, it is also necessary to include null-polarity phases of known width separating areas of opposite polarity in the manufacturing process in order to avoid short-circuiting. Otherwise the performance of such devices could be spoiled. In this work, we propose an appropriate topology optimization interpolation function for the electrode profile such that the effect of this new phase (hereafter gap-phase) is included in the formulation of the design problem. The approach is density-based, where the interface is controlled by including the gradient norm in the electrode profile interpolation. Through a detailed case study in 1d, conclusions on how to control the width of this gap-phase are extracted, and subsequently extended to the 2d case.
      PubDate: 2015-09-23
  • Multi-objective design optimization strategies for small-scale
           vertical-axis wind turbines
    • Abstract: Abstract Extracting energy from wind has been an interesting and serious topic over the last few decades and a lot of work has been done on the subject. This paper discusses in detail possible approaches to optimization of a somewhat less known type of wind turbines, particularly suitable for small consumers. In order to perform full aerodynamic and structural shape optimization of a small-scale vertical-axis wind turbine, a Double-multiple streamtube model code, known to provide good results in stationary working regimes, was complemented by a finite element analysis and implemented into a multi-objective particle swarm algorithm. For the purpose of shortening the total time needed for aerodynamic computation, the performed numerical simulations were two-dimensional and experimentally measured static airfoil data were used. The used aerodynamic model was validated against the available experimental data of similar wind turbines. The subsequent structural analyses of the composite turbine blades were performed by applying computed maximal aerodynamic forces together with gravitational and inertial loads. By employing various input and output parameters different multi-objective optimization strategies were analyzed and compared and their applicability was demonstrated. Investigated input parameters included: wind turbine rotor diameter, blade length, chord and airfoil, composite shell thickness, laminate lay-up and ply orientations, while optimization goal functions and constraints comprised rated power, cut-in and optimal wind speed, blade mass, tip deflection, failure index and blade natural frequencies. The fidelity and accuracy of proposed methodologies can be increased by employing more complex numerical models which can easily be implemented into the code.
      PubDate: 2015-09-22
  • Truss optimization with discrete design variables: a critical review
    • Abstract: Abstract This review presents developed models, theory, and numerical methods for structural optimization of trusses with discrete design variables in the period 1968 – 2014. The comprehensive reference list collects, for the first time, the articles in the field presenting deterministic optimization methods and meta heuristics. The field has experienced a shift in focus from deterministic methods to meta heuristics, i.e. stochastic search methods. Based on the reported numerical results it is however not possible to conclude that this shift has improved the competences to solve application relevant problems. This, and other, observations lead to a set of recommended research tasks and objectives to bring the field forward. The development of a publicly available benchmark library is urgently needed to support development and assessment of existing and new heuristics and methods. Combined with this effort, it is recommended that the field begins to use modern methods such as performance profiles for fair and accurate comparison of optimization methods. Finally, theoretical results are rare in this field. This means that most recent methods and heuristics are not supported by mathematical theory. The field should therefore re-focus on theoretical issues such as problem analysis and convergence properties of new methods.
      PubDate: 2015-09-21
  • Dynamic response topology optimization in the time domain using model
           reduction method
    • Abstract: Abstract The dynamic response topology optimization problems are usually computationally expensive, so it is necessary to employ the model reduction methods to reduce computational cost. This work will investigate the effectiveness of the mode displacement method(MDM) and mode acceleration method(MAM) for time-domain response problems within the framework of density-based topology optimization. Three objective functions, the mean dynamic compliance, mean strain energy and mean squared displacement are considered. It is found that, in general cases, MDM is not suitable for time-domain response topology optimization problems due to its low accuracy of approximation, while MAM works well for problems of a wide range, and when there are many time steps, the MAM based topology optimization approach is more efficient than the direct integration based approach. So for practical applications, when the problem needs many time steps, the MAM based approach is preferred and otherwise, the direct integration based approach is suggested.
      PubDate: 2015-09-19
  • Design and optimization of a new composite bumper beam in high-speed
           frontal crashes
    • Abstract: Abstract Normally, automobile bumper system absorbs the collision kinetic energy by deflection in low-speed crash and by deformation in high-speed crash. The main component of this system is the bumper beam, generally made of steel. The purpose of this paper is to improve energy absorption and light the weight of bumper by applying Fruit Fly Optimization Algorithm (FOA) in frontal bumper beam. The simulation of the frontal crash by using the Finite Element (FE) model is based on the New Car Assessment Program (NCAP). The most important parameters including the type of materials, thicknesses and layup of composite layers are studied by Rescaled Range Analysis (RRA). Then, the diminution of the value of Head Injury Criterion (HIC) is treated as optimization objective in the simulation of FE model, the thicknesses of composite beam are designed and analyzed through Fruit Fly Optimization Algorithm (FOA). In addition, the optimization results are compared with the results analyzed by Genetic Algorithm (GA). It can be observed from the results that the value of HIC is reduced by 6.37 %, the new composite beam will be just 4.84 % lighter than the steel part, and its peak value of collision energy absorption is 1.36 times larger than that of the steel part. In conclusion, the FOA can be applied in design of the new composite bumper beam in improving energy absorption and lightweight.
      PubDate: 2015-09-19
  • Layout optimization of continuum structures considering the probabilistic
           and fuzzy directional uncertainty of applied loads based on the cloud
    • Abstract: Abstract This paper reports an efficient approach for uncertain topology optimization in which the uncertain optimization problem is equivalent to that of solving a deterministic topology optimization problem with multiple load cases. Probabilistic and fuzzy property of the directional uncertainty of the applied loads is considered in the topology optimization; the cloud model is employed to describe that property which can also take the correlations of the probability and fuzziness into account. Convergent and mesh-independent bi-directional evolutionary structural optimization (BESO) algorithms are utilized to obtain the final optimal solution. The proposed method is suitable for linear elastic problems with uncertain applied loads, subject to volume constraint. Several numerical examples are presented to demonstrate the capability and effectiveness of the proposed approach. In-depth discussions are also given on the effects of considering the probability and fuzziness of the directions of the applied loads on the final layout.
      PubDate: 2015-09-18
  • The extreme property of twisted spherical shell
    • Abstract: Abstract The optimization for torsion compliance of the section of shell of revolution is studied. The section of shell with the normal to the symmetrical axis end planes is considered. The load is applied to the free end of the shell. Parallel displacement of the free edge is caused by the applied torque. The problem of optimizing the rigidity is the minimization of the compliance with total mass constraint. The mass of the shell’s material is regarded as fixed. The radius of the shell and the thickness are unknowns. The principal curvatures of the optimal shell proved to be positive and equal. Consequently, the optimal shape is sphere.
      PubDate: 2015-09-17
  • On the influence of model reduction techniques in topology optimization of
    • Abstract: Abstract Employing the floating frame of reference formulation in the topology optimization of dynamically loaded components of flexible multibody systems seems to be a natural choice. In this formulation the deformation of flexible bodies is approximated by global shape functions, which are commonly obtained from finite element models using model reduction techniques. For topology optimization these finite element models can be parameterized using the solid isotropic material with penalization (SIMP) approach. However, little is known about the interplay of model reduction and SIMP parameterization. Also securing the model reduction quality despite major changes of the design during the optimization has not been addressed yet. Thus, using the examples of a flexible frame and a slider-crank mechanism this work discusses the proper choice of the model reduction technique in the topology optimization of flexible multibody systems.
      PubDate: 2015-09-10
  • An adaptive RBF-based multi-objective optimization method for
           crashworthiness design of functionally graded multi-cell tube
    • Abstract: Abstract Multi-objective optimization (MOO) problems involving expensive black-box functions are common in various engineering design problems. Currently, metamodel-based multi-objective optimization methods using static metamodels are routinely used to solve these MOO problems. The major challenge to static metamodel-based MOO methods lies in solution accuracy, which heavily depends on the accuracy of the metamodels. While sequential or successive methods can be used to improve the accuracy of a metamodel in a small local region, they are not appropriate for MOO problems because the Pareto optima do not fall into the same small region in the design space. In this study, a novel metamodel-based MOO method using adaptive radial basis functions (ARBFs) was developed for efficiently and effectively solving MOO problems. The ARBFs are globally metamodels that are adaptively improved at various local regions where the Pareto optimal designs are located. The performance of this novel method was first evaluated using six mathematical functions. In addition, the ARBF-based MOO method was also used in a practical application, i.e., the crashworthiness optimization of a new kind of thin-walled structure named functionally graded multi-cell tube (FGMT) that was shown to be a good energy absorber in vehicle bodies.
      PubDate: 2015-09-05
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