Search results for " Optimal Design"

showing 10 items of 14 documents

MULTICRITERIA OPTIMAL DESIGN OF CONTINUOUS CIRCULAR PLATES

2010

The paper is devoted to a quite general version of the multicriteria optimal (minimum volume) design of axisymmetric circular plates. The constitutive material is considered as elastic perfectly plastic without any ductility limit and the actions are assumed as quasi-statically variable within a given load domain. In the design problem formulation different resistance criteria are considered, in order to investigate all the possible structural limit responses, and for each one a suitably chosen safety factor is chosen. The optimal design problem is formulated as the search for the minimum structure volume according with a statical approach. The features of the optimal structures will be stu…

Elastic plastic circular plates Multicriteria optimal design Elastic behaviour Shakedown Instantaneous collapse.Settore ICAR/08 - Scienza Delle Costruzioni
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Influence of protecting devices on the optimal design of elastic plastic structures

2008

The paper concerns the minimum volume design of structures constituted by elastic perfectly plastic material. The relevant optimal design problem is formulated on the grounds of a statical approach and two different resistance limits are considered: in particular, it is required that the optimal structure satisfies the elastic shakedown limit and the instantaneous collapse limit, imposing for each different condition a suitably chosen safety factor. For sake of generality, the structure is thought as discretized into compatible finite elements and subjected to loads quasi-statically acting as well as to dynamic (seismic) loads. The effects of the dynamic actions are studied on the grounds o…

Elastic plastic structures dynamic actions optimal design shakedown behaviour base isolation energy dissipationSettore ICAR/08 - Scienza Delle Costruzioni
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Numerical validation of LRPH behaviour by FEM analysis

2019

LRPH connection is a special steel device mainly usable to join beam elements of plane or spatial steel frames. It is identified as Limited Resistance Rigid Perfectly Plastic Hinge and it is covered by patent n. 102017000088597 at the Italian Ministry of Economic Development and identified in the International Patent System with the number PCT/IB2018/055766. The fundamental innovations of this device are the mutual independence of their own resistance and stiffness features and the respect of assigned constraints related to the elastic and limit behavior of the joined elements. Within the frame structural scheme, the device plays the role of a rigid perfectly plastic hinge, and it is consti…

LRPH Optimal design FEM analysis steel structures
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Minimum displacement design of base isolation devices

2014

Minimum displacement optimal design base isolation devicesSettore ICAR/08 - Scienza Delle Costruzioni
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Nontraditional configuration of tuned liquid column damper inerter for base-isolated structures

2023

In this paper, the concept of a novel passive control device, namely the Nontraditional Tuned Liquid Column Damper Inerter (NT-TLCDI), is investigated in combination with seismic base isolation (BI), to control lateral displacement demands in base-isolated structures during seismic events. The considered NT-TLCDI is a revision of the ordinary configuration of the recently proposed Tuned Liquid Column Damper Inerter (TLCDI). Unlike the traditional TLCDI layout, which involves a secondary liquid mass in a U-shaped tank coupled with a grounded inerter and connected to the isolation system by a spring-dashpot system, in the NT-TLCDI configuration, the damper is in parallel with the inerter rath…

Nontraditional TLCDI Base isolation Inerter Optimal designMechanics of MaterialsMechanical EngineeringGeneral Materials ScienceCondensed Matter PhysicsSettore ICAR/08 - Scienza Delle CostruzioniCivil and Structural Engineering
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Automatic EMI filter design for power electronic converters oriented to high power density

2018

In this paper, a complete computer aided procedure based on the power density concept and aimed at the automatic design of EMI filters for power electronic converters is presented. It is rule-based, and it uses suitable databases built-up by considering information on passive components available from commercial datasheets. The power density constraint is taken into consideration by imposing the minimization of the filter volume and/or weight; nevertheless, the system in which the automatically designed filter is included satisfies the electromagnetic compatibility standards limits. Experimental validations of the proposed procedure are presented for two real case studies, for which the per…

Optimal designEMI filterComputer Networks and CommunicationsComputer sciencelcsh:TK7800-836002 engineering and technologyelectrical drivesElectrical driveEMI filter; power converter; power density; optimal design; electrical drives0202 electrical engineering electronic engineering information engineeringElectronic engineeringElectrical and Electronic EngineeringElectrical drives; EMI filter; Optimal design; Power converter; Power density; Control and Systems Engineering; Signal Processing; Hardware and Architecture; Computer Networks and Communications; Electrical and Electronic EngineeringPower densitylcsh:Electronics020208 electrical & electronic engineeringElectromagnetic compatibility020206 networking & telecommunicationsConvertersPower converterPower (physics)Power densityFilter designSettore ING-IND/31 - ElettrotecnicaComputer Networks and CommunicationFilter (video)Control and Systems EngineeringHardware and Architecturevisual_artElectronic componentSignal Processingvisual_art.visual_art_medium
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Optimization of structures with unrestricted dynamic shakedown constraints

2015

The unrestricted dynamic shakedown theory is here utilized with the aim to formulate different optimal design problems for structures mainly subjected to seismic loads. In particular, reference is made to plane frame structures constituted by elastic perfectly plastic material subjected to load combinations characterized by the presence of simultaneous fixed and seismic actions. The design problems, formulated on the ground of a statical approach, are devoted to structures with and without seismic protection devices, with special emphasis to seismic isolators. For the proposed design problem formulations different constraints are utilized; actually, for structures without protection devices…

Optimal designEngineeringControl and OptimizationServiceability (structure)business.industryProblem FormulationsSeismic loadingdynamic shakedown optimal designStructural engineeringComputer Graphics and Computer-Aided DesignComputer Science ApplicationsShakedownModalControl and Systems EngineeringBase isolationbusinessEngineering design processSettore ICAR/08 - Scienza Delle CostruzioniSoftware
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Discrete variable design of frames subjected to seismic actions accounting for element slenderness

2015

An optimal design problem formulation of elastic plastic frames under different combinations of fixed and seismic loads is presented. The optimal structure must behave elastically for the fixed loads, shakedown for serviceability conditions and prevent instantaneous collapse for fixed and high seismic loads. P-Delta effects and element buckling are considered. An appropriate modal technique is utilized. The design variables can have components in a continuous field or, alternatively, in chosen discrete sets or, yet, both kind of variables can be present. The design problem is formulated on the ground of a statical approach. The applications are related to steel frames.

Optimal designEngineeringServiceability (structure)business.industryMechanical EngineeringSeismic loadingStructural engineeringComputer Science ApplicationsShakedownModaldiscrete variables optimal design dynamic loading element buckling P-delta effectsBucklingDynamic loadingModeling and SimulationGeneral Materials ScienceDiscrete variablebusinessSettore ICAR/08 - Scienza Delle CostruzioniCivil and Structural Engineering
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On the Theoretical Limits of Noise-Gain-Mismatch Tradeoff in the Design of Multi-Stage Cascaded Transistor Amplifiers

2007

The problem of evaluating the limit performances of cascaded single-ended multi-stage transistor amplifiers is addressed. In particular, a theoretically rigorous approach is proposed for the determination of a family of optimal design curves (ODC's) which express the best (maximum optimal) noise-gain tradeoff that can be achieved - at each operating frequency - when a simultaneous constraint on amplifier input VSWR is accounted for.

Optimal designEngineeringbusiness.industryLow-noise techniques Transistor amplifiers Optimal design.AmplifierTransistorTransistor arrayNoise (electronics)Settore ING-INF/01 - Elettronicalaw.inventionControl theorylawCurrent sense amplifierLimit (music)Electronic engineeringNetwork synthesis filtersbusiness
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3D-2D dimensional reduction for a nonlinear optimal design problem with perimeter penalization

2012

A 3D-2D dimension reduction for a nonlinear optimal design problem with a perimeter penalization is performed in the realm of $\Gamma$-convergence, providing an integral representation for the limit functional.

Optimal designMathematical optimizationIntegral representationdimension reductionDimensionality reductionGeneral Medicinedimension reduction; optimal designPerimeterNonlinear systemMathematics - Analysis of PDEsDimensional reductionConvergence (routing)FOS: MathematicsApplied mathematicsLimit (mathematics)optimal designDimensional reductionMathematicsAnalysis of PDEs (math.AP)
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