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  Subjects -> ENGINEERING (Total: 1957 journals)
    - CHEMICAL ENGINEERING (150 journals)
    - CIVIL ENGINEERING (146 journals)
    - ELECTRICAL ENGINEERING (84 journals)
    - ENGINEERING (1124 journals)
    - HYDRAULIC ENGINEERING (43 journals)
    - INDUSTRIAL ENGINEERING (53 journals)
    - MECHANICAL ENGINEERING (73 journals)

CIVIL ENGINEERING (146 journals)                  1 2     

ACI Structural Journal     Full-text available via subscription   (2 followers)
Acta Polytechnica : Journal of Advanced Engineering     Open Access  
Acta Structilia : Journal for the Physical and Development Sciences     Open Access   (2 followers)
Advances in Civil Engineering     Open Access   (22 followers)
Advances in Structural Engineering     Full-text available via subscription   (18 followers)
Ambiente Construído     Open Access   (2 followers)
American Journal of Civil Engineering and Architecture     Open Access   (15 followers)
Architectural Engineering     Open Access   (3 followers)
Archives of Civil Engineering     Open Access   (7 followers)
Archives of Hydro-Engineering and Environmental Mechanics     Open Access   (2 followers)
ATBU Journal of Environmental Technology     Open Access  
Australian Journal of Structural Engineering     Full-text available via subscription   (2 followers)
Baltic Journal of Road and Bridge Engineering     Full-text available via subscription  
BER : Building and Construction : Full Survey     Full-text available via subscription   (8 followers)
BER : Building Contractors' Survey     Full-text available via subscription   (3 followers)
BER : Building Sub-Contractors' Survey     Full-text available via subscription   (2 followers)
BER : Survey of Business Conditions in Building and Construction : An Executive Summary     Full-text available via subscription   (3 followers)
Berkeley Planning Journal     Open Access   (5 followers)
Bridge Structures : Assessment, Design and Construction     Hybrid Journal   (10 followers)
Building and Environment     Hybrid Journal   (10 followers)
Building Women     Full-text available via subscription  
Built Environment Project and Asset Management     Hybrid Journal   (11 followers)
Canadian Journal of Civil Engineering     Full-text available via subscription   (10 followers)
Case Studies in Engineering Failure Analysis     Open Access   (3 followers)
Cement and Concrete Composites     Hybrid Journal   (6 followers)
Change Over Time     Full-text available via subscription   (3 followers)
Civil and Environmental Research     Open Access   (11 followers)
Civil Engineering     Hybrid Journal   (10 followers)
Civil Engineering = Siviele Ingenieurswese     Full-text available via subscription   (4 followers)
Civil Engineering and Environmental Systems     Hybrid Journal   (3 followers)
Civil Engineering and Technology     Open Access   (1 follower)
Civil Engineering Dimension     Open Access   (3 followers)
Cohesion and Structure     Full-text available via subscription   (1 follower)
Composite Structures     Hybrid Journal   (33 followers)
Computer-aided Civil and Infrastructure Engineering     Hybrid Journal   (7 followers)
Computers & Structures     Hybrid Journal   (13 followers)
Concrete Research Letters     Open Access   (1 follower)
Constructii : Journal of Civil Engineering Research     Open Access   (4 followers)
Construction Engineering     Open Access   (3 followers)
Construction Management and Economics     Hybrid Journal   (25 followers)
Construction Science     Open Access   (1 follower)
Constructive Approximation     Hybrid Journal   (1 follower)
Current Advances in Civil Engineering     Open Access  
Earthquake Engineering and Structural Dynamics     Hybrid Journal   (10 followers)
Enfoque UTE     Open Access   (1 follower)
Engineering Project Organization Journal     Hybrid Journal   (4 followers)
Engineering Structures     Hybrid Journal   (11 followers)
Engineering Structures and Technologies     Hybrid Journal   (2 followers)
Engineering, Construction and Architectural Management     Hybrid Journal   (15 followers)
European Journal of Environmental and Civil Engineering     Hybrid Journal   (2 followers)
Fatigue & Fracture of Engineering Materials and Structures     Hybrid Journal   (12 followers)
Frattura ed Integrità Strutturale : Fracture and Structural Integrity     Open Access   (1 follower)
Frontiers of Structural and Civil Engineering     Hybrid Journal   (4 followers)
Geomaterials     Open Access   (2 followers)
Geosystem Engineering     Hybrid Journal   (3 followers)
Geotechnik     Hybrid Journal  
Géotechnique Letters     Hybrid Journal   (1 follower)
HBRC Journal     Open Access   (1 follower)
HVAC&R Research     Hybrid Journal   (1 follower)
Indoor and Built Environment     Hybrid Journal   (1 follower)
Ingenio Magno     Open Access  
Insight - Non-Destructive Testing and Condition Monitoring     Full-text available via subscription   (4 followers)
International Journal for Service Learning in Engineering     Open Access  
International Journal of 3-D Information Modeling     Full-text available via subscription   (2 followers)
International Journal of Advanced Structural Engineering     Open Access   (6 followers)
International Journal of Concrete Structures and Materials     Open Access   (5 followers)
International Journal of Construction Engineering and Management     Open Access   (3 followers)
International Journal of Protective Structures     Full-text available via subscription   (5 followers)
International Journal of Steel Structures     Hybrid Journal   (3 followers)
International Journal of Structural Engineering     Hybrid Journal   (6 followers)
International Journal of Structural Integrity     Hybrid Journal  
International Journal of Structural Stability and Dynamics     Hybrid Journal   (4 followers)
International Journal of Sustainable Built Environment     Open Access   (2 followers)
International Journal of Sustainable Construction Engineering and Technology     Open Access   (7 followers)
ISRN Civil Engineering     Open Access   (4 followers)
ISRN Power Engineering     Open Access   (1 follower)
Journal of Accessibility and Design for All     Open Access   (3 followers)
Journal of Bridge Engineering     Full-text available via subscription   (10 followers)
Journal of Building Performance Simulation     Hybrid Journal   (3 followers)
Journal of Civil Engineering and Construction Technology     Open Access   (2 followers)
Journal of Civil Engineering and Management     Hybrid Journal   (4 followers)
Journal of Civil Engineering and Science     Open Access   (8 followers)
Journal of Civil Engineering Research     Open Access   (8 followers)
Journal of Civil Society     Hybrid Journal   (2 followers)
Journal of Civil Structural Health Monitoring     Hybrid Journal  
Journal of Composites     Open Access   (3 followers)
Journal of Composites for Construction     Full-text available via subscription   (7 followers)
Journal of Computing in Civil Engineering     Full-text available via subscription   (16 followers)
Journal of Construction Engineering     Open Access   (3 followers)
Journal of Construction Engineering and Management     Full-text available via subscription   (19 followers)
Journal of Construction Engineering, Technology & Management     Full-text available via subscription   (2 followers)
Journal of Constructional Steel Research     Hybrid Journal   (6 followers)
Journal of Earth Sciences and Geotechnical Engineering     Open Access   (1 follower)
Journal of Fluids and Structures     Hybrid Journal   (1 follower)
Journal of Frontiers in Construction Engineering     Open Access   (1 follower)
Journal of Green Building     Full-text available via subscription   (6 followers)
Journal of Highway and Transportation Research and Development (English Edition)     Full-text available via subscription   (3 followers)
Journal of Infrastructure Systems     Full-text available via subscription   (12 followers)
Journal of Legal Affairs and Dispute Resolution in Engineering and Construction     Full-text available via subscription   (5 followers)
Journal of Marine Science and Engineering     Open Access   (1 follower)

        1 2     

Structural and Multidisciplinary Optimization    [5 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  [2187 journals]   [SJR: 1.273]   [H-I: 54]
  • NURBS modeling and structural shape optimization of cardiovascular stents
    • Abstract: Abstract Cardiovascular stents have been used since the 1990s to treat atherosclerosis, one of leading causes of death in the western world, and structural optimization has led to significant improvements in stent performance. Much of the potential variation in stent geometry, however, has remained unconsidered. This paper presents a non-uniform rational basis spline (NURBS) parameterization of a stent, the inclusion of structural fatigue resistance as a design consideration, and the results of a design optimization based on response surface techniques. Results show the feasibility and merits of the NURBS approach, which models a much broader range of shapes than was previously possible. Multi-objective optimization produces a range of geometrically diverse Pareto-optimal designs; these can be used to develop future clinical design guides, accounting for the variation observed across patients. We conclude by motivating future work with increasingly complex physical modeling and optimization capabilities.
      PubDate: 2014-01-26
  • A stress-based formulation of the free material design problem with the
           trace constraint and multiple load conditions
    • Abstract: Abstract The paper deals with minimization of the weighted sum of compliances related to the load cases applied non-simultaneously. The design variables are all components of the Hooke tensor, subject to the isoperimetric condition bounding the integral of the sum of the Kelvin moduli. This free material design problem is reduced to an equilibrium problem – in two formulations – of an effective body with locking. The stress-based formulation reduces to minimization of an integral of a certain norm of stress fields over the stress fields which equilibrate the given loads. The equivalent displacement-based formulation involves a locking locus defined by using a norm being dual to the previous one. The optimal Hooke tensor is determined by using the stress fields solving the auxiliary locking problem. To make the optimal Hooke tensor positive definite one should consider at least 3 load conditions in the 2D case and not less than 6 load conditions in the 3D case.
      PubDate: 2014-01-25
  • Integrated size and topology optimization of skeletal structures with
           exact frequency constraints
    • Abstract: Abstract The present paper studies the integrated size and topology optimization of skeletal structures under natural frequency constraints. It is found that, unlike the conventional compliance-oriented topology optimization problems, the considered problem may be strongly singular in the sense that the corresponding feasible domain may be disconnected and the global optimal solutions are often located at the tips of some separated low dimensional sub-domains when the cross-sectional areas of the structural components are used as design variables. As in the case of stress-constrained topology optimization, this unpleasant behavior may prevent the gradient-based numerical optimization algorithms from finding the true optimal topologies. To overcome the difficulties posed by the strongly singular optima, some particular forms of area/moment of inertia-density interpolation schemes, which can restore the connectedness of the feasible domain, are proposed. Based on the proposed optimization model, the probability of finding the strongly singular optimum with gradient-based algorithms can be increased. Numerical examples demonstrate the effectiveness of the proposed approach.
      PubDate: 2014-01-24
  • Backward walking simulation of humans using optimization
    • Abstract: Abstract The objective of this study is to formulate, simulate and study the backward walking motion of a full-body skeletal digital human model using an optimization approach. Predictive dynamics is used to simulate the task in which joint angle profiles are treated as primary unknowns in the formulation. The joint torques are treated as dependent variables that are evaluated directly from the equations of motion. For the performance measure, the normalized dynamic effort represented by the integral of the squares of all the normalized joint torques is minimized subject to the associated physical constraints. Backward walking at different speeds is simulated and analyzed. The backward walking is validated with motion capture data and the available data in the literature. The results of the backward walking motion are compared to those of the forward walking motion in order to study the differences between the two walking patterns. It is seen that the joint torque profiles for hip and knee of backward walk are quite similar to those of forward walk with reverse sequence, but with different time duration of flexion and extension activations. These findings can impact many fields, such as improvement of human performance, rehabilitation from injuries, and others.
      PubDate: 2014-01-24
  • Principal angles between subspaces and reduced order modelling accuracy in
    • Abstract: Abstract The paper considers robust parametric optimization problems using multi-point formulations and addresses the issue of the approximation of the gradient of the functional by reduced order models. The question of interest is the impact of such approximations on the search subspace in the multi-point optimization problem. The mathematical concept used to evaluate these approximations is the principal angles between subspaces and practical ways to evaluate these are provided. An additional indicator is provided when a descent minimization algorithm is used. The approach appears also to be an interesting tool for uncertainty quantification of the design in the presence of models of increasing complexity. The application of these concepts is illustrated in the design of the shape of an aircraft robust over a range of transverse winds.
      PubDate: 2014-01-24
  • Stress constrained compliance minimization by means of the small amplitude
           homogenization method
    • Abstract: Abstract Under the assumption of small contrast between the elasticity tensors of two materials, we derive an algorithm based on an approximate relaxation of a problem that minimizes the compliance under a constraint on stress. Numerical results are presented for the short cantilever problem, where we see that, for a 1 to 2 contrast in Young moduli, and when compared with a configuration that only minimizes compliance, one can get up to a 46 % reduction in peak stress, while compliance increases by only 1 %. The basis of the method is the small amplitude homogenization technique derived by Allaire and Gutiérrez, which relies on the use of H-measures introduced by Tartar to study the quadratic interaction of weakly convergent sequences of functions.
      PubDate: 2014-01-24
  • Shape optimization for the generalized Graetz problem
    • Abstract: Abstract We apply shape optimization tools to the generalized Graetz problem which is a convection-diffusion equation. The problem boils down to the optimization of generalized eigenvalues on a two phases domain. Shape sensitivity analysis is performed with respect to the evolution of the interface between the fluid and solid phase. In particular physical settings, counterexamples where there is no optimal domains are exhibited. Numerical examples of optimal domains with different physical parameters and constraints are presented. Two different numerical methods (level-set and mesh-morphing) are show-cased and compared.
      PubDate: 2014-01-10
  • A consistent frame for sensitivity filtering and the vertex assigned
           morphing of optimal shape
    • Abstract: Abstract The paper discusses the filtering of shape sensitivities as a mesh independent regularization method for very large problems of shape optimal design. The vertices of the simulation discretization grids are directly used as design morphing handles allowing for the largest possible design space. Still, however, there has been a lack of theory to consistently merging the sensitivity filtering into the standard optimization technology which is an ongoing topic of discussion in the community. The actual paper tries to overcome this burden. As a result it will be shown that there is a perfect transition between the sensitivity filtering and all the other shape parameterization techniques used for the shape optimization, as there are CAD-based techniques, subdivision surfaces or morphing box technologies. It appears that sensitivity filtering belongs to the most general and powerful control technologies available for shape optimal design. The success will be demonstrated by various illustrative examples which span from basic aspects to sophisticated applications in structural and fluid mechanics.
      PubDate: 2014-01-10
  • Metamodel-assisted optimization based on multiple kernel regression for
           mixed variables
    • Abstract: Abstract While studies in metamodel-assisted optimization predominantly involve continuous variables, this paper explores the additional presence of categorical data, representing for instance the choice of a material or the type of connection. The common approach consisting in mapping them onto integers might lead to inconsistencies or poor approximation results. Therefore, an investigation of the best coding is necessary; however, to build accurate and flexible metamodels, a special attention should also be devoted to the treatment of the distinct nature of the variables involved. Consequently, a multiple kernel regression methodology is proposed, since it allows for selecting separate kernel functions with respect to the variable type. The validation of the advocated approach is carried out on six analytical benchmark test cases and on the structural responses of a rigid frame. In all cases, better performances are obtained by multiple kernel regression with respect to its single kernel counterpart, thereby demonstrating the potential offered by this approach, especially in combination with dummy coding. Finally, multi-objective surrogate-based optimization is performed on the rigid frame example, firstly to illustrate the benefit of dealing with mixed variables for structural design, then to show the reduction in terms of finite element simulations obtained thanks to the metamodels.
      PubDate: 2014-01-10
  • The use of topology optimization in disposing carbon fiber reinforcement
           for concrete structures
    • Abstract: Abstract A topology optimization procedure is presented as a tool for determining the distribution of external strengthening of concrete slabs, using Carbon Fiber Reinforced Polymer (CFRP). Although the procedure is applied to slabs in this work, the technique can be used in any concrete structure to be reinforced. Numerical simulations are performed using the Finite Element Method, in combination with the automated topology optimization procedure, to indicate the optimal region for placement of the reinforcement. The influence of some aspects of the slab’s structural behavior on the optimization results is presented: concrete cracking, boundary conditions and reinforcement rate. A brief discussion is given of the similarity between the topology optimization results obtained by the maximum stiffness and ultimate strength criteria. Gains are found in the stiffness and strength of reinforced parts. A comparison with conventional reinforcement techniques demonstrates that topology optimization can be a useful tool for defining the region of reinforcement, allowing for material cost savings.
      PubDate: 2014-01-10
  • A survey of structural and multidisciplinary continuum topology
           optimization: post 2000
    • Abstract: Abstract Topology optimization is the process of determining the optimal layout of material and connectivity inside a design domain. This paper surveys topology optimization of continuum structures from the year 2000 to 2012. It focuses on new developments, improvements, and applications of finite element-based topology optimization, which include a maturation of classical methods, a broadening in the scope of the field, and the introduction of new methods for multiphysics problems. Four different types of topology optimization are reviewed: (1) density-based methods, which include the popular Solid Isotropic Material with Penalization (SIMP) technique, (2) hard-kill methods, including Evolutionary Structural Optimization (ESO), (3) boundary variation methods (level set and phase field), and (4) a new biologically inspired method based on cellular division rules. We hope that this survey will provide an update of the recent advances and novel applications of popular methods, provide exposure to lesser known, yet promising, techniques, and serve as a resource for those new to the field. The presentation of each method’s focuses on new developments and novel applications.
      PubDate: 2014-01-01
  • Thermal-composite design optimization for heat flux shielding, focusing,
           and reversal
    • Abstract: Abstract The optimization of thermal-composite structural designs for heat flux shielding, focusing, and reversal is explained in this paper. Heat conduction in anisotropic solids is reviewed, and a detailed two-phase material microstructure description for non-symmetric inclusions embedded in a matrix medium is provided. Objective functions related to heat flux shielding and focusing are derived from a general energy formulation of thermal compliance by using information related to the magnitude of the thermal gradients. Additionally, a multi-term objective function for heat flux reversal is developed based on the directionality of the thermal gradients. A computational optimization technique is then employed to examine the validity of these three design objectives in the context of an established benchmark example. The results of these numerical experiments are shown to be in good agreement with experimental results from the literature. Additionally, the optimization method is shown to be capable of handling structures with arbitrary geometry. Logical extensions of the method include the development of novel structural layouts for thermal circuits, thermal cloaks, and negative differential thermal resistance materials.
      PubDate: 2014-01-01
  • A comparison between optimization-based human motion prediction methods:
           data-based, knowledge-based and hybrid approaches
    • Abstract: Abstract In this paper an optimization-based hybrid dynamic motion prediction method is presented. The method is hybrid as the prediction relies both on actually performed motions for reference (following a data-based approach) and on the definition of appropriate performance measures (following a knowledge-based approach). The prediction is carried out through the definition of a constrained non-linear optimization problem, in which the objective function is composed of a weighted combination of data-based and knowledge-based contributions. The weights of each contribution are varied in order to generate a battery of hybrid predictions, which range from purely data-based to purely knowledge-based. The results of the predictions are analyzed and compared against actually performed motions both qualitatively and quantitatively, using a measure of realism defined as the distance of the predicted motions from the mean of the actually performed motions. The method is applied to clutch pedal depression motions and the comparison between the different approaches favors the hybrid solution, which seems to combine the strengths of both data- and knowledge-based approaches, enhancing the realism of the predicted motion.
      PubDate: 2014-01-01
  • Structural dynamic topology optimization based on dynamic reliability
           using equivalent static loads
    • Abstract: Abstract An approach for reliability-based topology optimization of interval parameters structures under dynamic loads is proposed. We modify the equivalent static loads method for non linear static response structural optimization (ESLSO) to solve the dynamic reliability optimization problem. In our modified ESLSO, the equivalent static loads (ESLs) are redefined to consider the uncertainties. The new ESLs including all the uncertainties from geometric dimensions, material properties and loading conditions generate the same interval response field as dynamic loads. Based on the definition of the interval non-probabilistic reliability index, we construct the static reliability topology optimization model using ESLs. The method of moving asymptotes (MMA) is employed as the optimization problem solver. The applicability and validity of the proposed model and numerical techniques are demonstrated with three numerical examples.
      PubDate: 2014-01-01
  • Stochastic minimax optimal control strategy for uncertain
           quasi-Hamiltonian systems using stochastic maximum principle
    • Abstract: Abstract A stochastic minimax optimal control strategy for uncertain quasi-Hamiltonian systems is proposed based on the stochastic averaging method, stochastic maximum principle and stochastic differential game theory. First, the partially completed averaged Itô stochastic differential equations are derived from a given system by using the stochastic averaging method for quasi-Hamiltonian systems with uncertain parameters. Then, the stochastic Hamiltonian system for minimax optimal control with a given performance index is established based on the stochastic maximum principle. The worst disturbances are determined by minimizing the Hamiltonian function, and the worst-case optimal controls are obtained by maximizing the minimal Hamiltonian function. The differential equation for adjoint process as a function of system energy is derived from the adjoint equation by using the Itô differential rule. Finally, two examples of controlled uncertain quasi-Hamiltonian systems are worked out to illustrate the application and effectiveness of the proposed control strategy.
      PubDate: 2014-01-01
  • Optimal design of elastic plastic frames accounting for seismic protection
    • Abstract: Abstract The optimal design of elastic perfectly plastic steel frames with or without suitable protection devices and subjected to static as well as seismic loadings is studied. Two minimum volume problem formulations are proposed, on the grounds of the so-called statical approach, accounting for three different resistance limits: the purely elastic limit, the (elastic) shakedown limit and the instantaneous collapse limit. The adopted load combinations are characterized by the presence of fixed loads, of quasi-static perfect cyclic loads and dynamic (seismic) loads. The linear elastic effects of the dynamic actions are studied by utilizing a modal technique. The proposed treatment is referred to the most recent Italian code related to the structural analysis and design. The solution of the optimization problem is reached by using an appropriate linearization iterative technique specialized to the proposed formulations. Flexural frames and cross-braced frames are studied, and the related minimum volume structures are reached for assigned features of the base isolation device. The Bree diagrams of the obtained optimal designs are also determined in order to characterize their structural behaviour.
      PubDate: 2014-01-01
  • Design optimization of a laser printer cleaning blade for minimizing
           permanent set
    • Abstract: Abstract When a cleaning blade in a laser printer is excessively deformed, immoderate permanent set can result, leading to weaker nip pressure between the cleaning blade and OPC drum that worsens its cleaning performance and printing quality. In this study, the correlation of the permanent set with stress and strain was investigated through tensile tests with rubber test specimens. Based on the experimental results, the maximum von-Mises stress value was used to quantify the permanent set. A design optimization problem was formulated to minimize the maximum von-Mises stress while satisfying the design constraints for maintaining appropriate contact between the cleaning blade and the OPC drum. We employed metamodel-based design optimization using design of experiments, metamodeling and an optimization algorithm to circumvent the difficulty of structural analyses at some design points. Using the proposed design approach, the optimal maximum von-Mises stress was reduced by 40.2 % compared to the initial stress value while all the design constraints were satisfied. In order to verify the validity of our design optimization result, we manufactured the cleaning blades according to the optimum design solution and performed permanent set and printer tests. The test results clearly showed the validity of our design optimization result.
      PubDate: 2014-01-01
  • Rules for trajectory updating in decision based design
    • Abstract: Abstract Optimization is an indispensable tool in decision based design (DBD). There is an emerging consensus in DBD that the only correct objective to maximize is the decision maker’s utility from a design. However, a utility function assessed a priori may not capture the preferences of the decision maker over the entire design space. As a result, when the optimizer searches for the optimal design, it may traverse (or end up) in regions in the design space where the preference order among different solutions is different from that used to build the utility function. For a highly non-convex design space, this can lead to convergence to a grossly suboptimal design depending on where we start the solution search. In this article, we propose two approaches to address this issue. First, we track the trajectory of the solution as generated by the optimizer and generate ranking questions that are presented to the designer to verify the correctness of the utility function, and second we propose backtracking rules if a local utility function is very different from the initially assessed function. We demonstrate our methodology using a mathematical example and a welded-beam design problem.
      PubDate: 2014-01-01
  • Structural topology optimization on dynamic compliance at resonance
           frequency in thermal environments
    • Abstract: Abstract This paper [r] carries out topology optimization to minimize structural dynamic compliance at resonance frequencies in thermal environments. The resonance response is the main dynamic component, minimization of which could possibly change structural dynamic characteristics significantly. A bi-material square plate subjected to uniform temperature rise and driven by harmonic load is investigated in pre-buckling state. The compressive stress induced by thermal environment is considered as pre-stress in dynamic analysis, which could reduce stiffness of the structure and alter the optimal topology. Sensitivity analysis is carried out through adjoint method efficiently. As natural frequencies are constantly changing during the optimization, the associated sensitivity should be calculated in which multiple-frequency case is briefly discussed. Mode switching may occur during the optimization, and mode tracking technique is adopted. Numerical results show that the topology is mainly determined by the excited modes, and could be altered by the location of the applied load if different modes are excited. The natural frequencies become larger in optimal design and the dynamic compliance decreases in nearby frequency band. The critical buckling temperature increases as optimization proceeds, indicating the structure is always in pre-buckling state.
      PubDate: 2014-01-01
  • Parameter-free optimum design method of stiffeners on thin-walled
    • Abstract: Abstract In this paper, we present a shape optimization method for designing stiffeners on thin-walled or shell structures. Solutions are proposed to deal with a stiffness maximization problem and a volume minimization problem, which are subject to a volume constraint and a compliance constraint, respectively. The boundary shapes of the stiffeners are determined under a condition where the stiffeners are movable in the in-plane direction to the surface. Both problems are formulated as distributed-parameter shape optimization problems, and the shape gradient functions are derived using a material derivative method and an adjoint variable method. The optimal free-boundary shapes of the stiffeners are obtained by applying the derived shape gradient function to the $H^{1}$ gradient method for shells, which is a parameter-free shape optimization method proposed by one of the authors. Several stiffener design examples are presented to validate the proposed method and demonstrate its practical utility.
      PubDate: 2014-01-01
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