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Active performance optimization of cantilever piezoelectric energy harvester 12

引用

asme 2014 12th biennial conference on engineering systems design and analysis, ESDA 2014

作者： Anbarani, M. Tavakkoli Alasty, A. Department of Mechanical Engineering Sharif University of Technology Tehran Iran

ISBN: (纸本)9780791845844

A Piezoelectric Energy Harvester (PEH) of cantilever beam type is developed to optimize the generated power by means of active control of moment of inertia of the beam. Distributed parameter equations of vibration of the beam are developed. then the electromechanical response of the piezoelectric actuator is discussed. the harvester configuration is then described and it is shown that such a configuration can avoid the drastic power drop in presence of uncertainty around resonance frequency by applying voltage to the piezoelectric actuator. Finally the proposed harvester output power working frequency span is compared to conventional methods to show that the significant performance optimization in proposed method is achieved. Copyright © 2014 by asme.

关键词： Piezoelectric actuators

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Optimal operation of small geothermal systems through entropy generation analysis 12

Optimal operation of small geothermal systems through entrop...

引用

asme 2014 12th biennial conference on engineering systems design and analysis, ESDA 2014

作者： Cosentino, Sara Sciacovelli, Adriano Verda, Vittorio Energy Deparment Politecnico di Torino Italy

ISBN: (纸本)9780791845844

Geothermal systems often experience non homogeneous behavior between the various boreholes, due to possible issues in the installation or to differences in the stratigraphy. In the case of small systems, this may create important inefficiencies or operational problems. In this paper, the use of entropy generation analysis is proposed in order to optimize the global performances, taking fluid dynamic and thermal phenomena into account. the possible anomalous scenarios that are considered include borehole ovalization and differences in the heat transfer between borehole and ground due to fouling, groundwater level, etc. the analysis is conducted considering a transient model of the entire system, composed by the ground, boreholes and heat pump. Various operating scenarios are also considered. Results show that non negligible improvements in the efficiency can be obtained by proper selection of the operating conditions. Copyright © 2014 by asme.

关键词： Heat transfer

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Form based reliability analysis with accurate sensitivity for heat conduction 12

引用

asme 2014 12th biennial conference on engineering systems design and analysis, ESDA 2014

作者： Jin, Weiya Dennis, Brian H. He, Xing Wang, Bo Ping Gao, Zengliang College of Mechanical Engineering Zhejiang University of Technology Hangzhou Zhejiang China Department of Mechanical and Aerospace Engineering University of Texas at Arlington ArlingtonTX76019 United States

ISBN: (纸本)9780791845837

the numerical analysis of heat transfer by finite element method (FEM) has been used widely. It is usually assumed that the parameters relevant to the heat transfer process are accurately known. However, many of these parameters may vary in a random way in reality. the reliability of the heat transfer performance is needed to be evaluated. the paper introduces an accurate, efficient sensitivity analysis method to compute the FEM response with respect to input parameters. Combining this sensitivity analysis, first order reliability method (FORM) algorithm based stochastic finite element method (SFEM) method is used to evaluate the reliability of the limit state for heat conduction of a benchmark plate with input uncertainties. Copyright © 2014 by asme.

关键词： Heat conduction

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Determining of optimized mechanical characters for designing of an artificial ankle 12

引用

asme 2014 12th biennial conference on engineering systems design and analysis, ESDA 2014

作者： Goudarzi, Ali M. Kheirollahi, Hossein Fazeli, Mohammad Imani, Misagh Department of Mechanical Engineering Babol University of Technology Babol Mazandaran Iran Department of Mechanical Engineering University of Manitoba WinnipegMB Canada

ISBN: (纸本)9780791845837

Investigating the mechanical behavior of a healthy human ankle shows that it can be simulated by a mechanism composed of simple elements such as spring, and actuator. Hence, appropriate design of this mechanism can be resulted to an artificial ankle that can help amputees properly. Researches show that whatever the biomechanical behavior of artificial ankle is similar to that of natural ankle, it can be used by consuming less energy. Considering biomechanical behavior of normal ankle in a walking gait, required parameters for designing of an artificial ankle composed of springs and electromechanical actuator will be determined. Finally, to verify the suggested model, a prototype will be materialized and tested. Copyright © 2014 by asme.

关键词： Electromechanical actuators

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Efficiency enhancement of a bidirectional impulse turbine using artificial neural network 12

Efficiency enhancement of a bidirectional impulse turbine us...

引用

asme 2014 12th biennial conference on engineering systems design and analysis, ESDA 2014

作者： Badhurshah, R. Samad, A. Department of Ocean Engineering Indian Institute of Technology Madras Chennai600036 India

ISBN: (纸本)9780791845837

the work represents a systematic numerical optimization methodology using artificial neural network and hybrid genetic algorithm for a bi-directional axial impulse turbine used in wave energy harvesting system. Reynolds-averaged Navier- Stokes equations with k-Ε turbulence model were discretized and solved for unstructured tetrahedral grid elements for flow analyses. Efficiency enhancement of the turbine was chosen as an objective. the design variables chosen were numbers of stator and rotor blades. the responses obtained from CFD analysis were used to train the neural network. the optimal point search from the network by hybrid genetic algorithm produced 13% increase in turbine efficiency. Detailed description of the methodology and analysis of the results has been presented in this paper. Copyright © 2014 by asme.

关键词： Genetic algorithms

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Multi-disciplinary and multi-objective optimization of a hydro-pneumatic balancing cylinder for an industrial robot 12

Multi-disciplinary and multi-objective optimization of a hyd...

引用

asme 2014 12th biennial conference on engineering systems design and analysis, ESDA 2014

作者： Persson, Johan A. Feng, Xiaolong Wappling, Daniel Ölvander, Johan Division of Machine Design Department of Management and Engineering Linköping University Sweden ABB Corporate Research Västerås Sweden

ISBN: (纸本)9780791845851

this article presents an optimization framework that is used to optimize a hydro-pneumatic balancing cylinder for industrial robots. A balancing cylinder is a device that is used to balance the gravitational torque of one of the main axes of a high-loaded serial industrial robot. the design of components for an industrial robot is multi-disciplinary, since disciplines such as multibody dynamics, drive train design and robot control are needed. the design process is also multi-objective since the functionality of the balancing cylinder should be optimal, while its size and cost should be minimal. the article therefore also contains a discussion about multi-disciplinary and multi-objective optimization of complex products. Copyright © 2014 by asme.

关键词： Industrial robots

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Kinematics and stiffness modeling of a 4-DOF parallel robot for Schönflies motion generation 12

引用

asme 2014 12th biennial conference on engineering systems design and analysis, ESDA 2014

作者： Bai, Shaoping Andersen, Lasse Køgs Mølgaard, Carsten Rebbe Department of Mechanical and Manufacturing Engineering Aalborg University Denmark

ISBN: (纸本)9780791845851

this work deals with the design of parallel robots for the generation of pick-and-place operation, or Schön flies motion. the aim is to develop a robot with workspace optimized for fast pick-and-place operations, namely, a robot with a superellipsoidal reachable volume, which suits best for the pick-and-place operations on conveyers, where robots' working areas are nearly rectangular. In this paper, the kinematics and stiffness modeling of the new robot are presented. A method of stiffness modeling by means of Castigliano's theorem is developed. Using the new method, the stiffness of the robot is analyzed. the results are compared with FEA simulation, which shows a good agreement between the results. the method is finally applied to the engineering design of the new robot for enhanced static and dynamic performance. Copyright © 2014 by asme.

关键词： Kinematics

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analysis of static strength and failure mode of FSSW joint in aluminium alloy 12

Analysis of static strength and failure mode of FSSW joint i...

引用

asme 2014 12th biennial conference on engineering systems design and analysis, ESDA 2014

作者： Vivio, Francesco Vullo, Vincenzo Fanelli, Pierluigi University of Rome Tor Vergata Rome Italy University of Tuscia Viterbo Italy

ISBN: (纸本)9780791845837

In this paper an analysis of Friction Stir Spot Welds (FSSW), applied to lap joint aluminum alloy is presented. the analyses regards the structural behavior of FSSW joints in order to assess the failure mode and its dependence on mechanical properties distribution of the sheets material and, consequently, on process parameters. FSSW joint is analyzed by means of a complex 3D FE model, which allows to evaluate, in a parametric manner, the multifaceted internal geometry of the joint and the actual distribution of material mechanical characteristics after welding. Experimental tests allowed to verify the results and to calibrate the material characteristics in the FE model. Copyright © 2014 by asme.

关键词： Aluminum alloys

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Visualising, analysing & managing the design factory 12

Visualising, analysing & managing the design factory

引用

asme 2014 12th biennial conference on engineering systems design and analysis, ESDA 2014

作者： Sinha, Apurva K. Weaver, Matt Morgan, Stephen G. Rolls-Royce Plc P.O. Box 31 Derby United Kingdom EQ Technologic Rugby United Kingdom

ISBN: (纸本)9780791845851

In this paper, we present a framework to define, visualise, analyse and manage a design factory in a complex engineering environment. design engineering is the core of product development and provides high leverage in cost, quality and time to market. Lean principles can be applied to gain these improvements to the design management system. However, unlike manufacturing and operations, design processes are inherently non-linear and iterative in nature. In addition, design outputs, queues and work in progress are not visible and tangible. this creates challenges in applying lean principles in the design environment. To alleviate these issues design engineering is treated as a factory and its key steps are mapped by using the gated review process. the inputs and outputs of the design factory system are identified and employed to create an effective productivity improvement dashboard. the gated review process steps are used to understand the flow of design solutions. Lean principles and structured root-cause analysis is used to create a system to visualise, analyse and manage the design factory. Copyright © 2014 by asme.

关键词： Productivity

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the effects of groundwater flow on vertical-borehole ground source heat pump systems 12

引用

asme 2014 12th biennial conference on engineering systems design and analysis, ESDA 2014

作者： Funabiki, Ayako Oguma, Masahito Yabuki, Taisei Kakizaki, Takao College of Engineering Nihon University Koriyama Fukushima Japan

ISBN: (纸本)9780791845851

Heat advection by groundwater flow is known to improve the performance of ground heat exchangers (GHEs), but the effect of groundwater advection on performance is not yet fully understood. this study examined how parameters related to groundwater flow, such as aquifer thickness, porosity, lithology, and groundwater flow velocity, affect the performance of a borehole GHE. Under the thin-aquifer condition (10 m, or 10% of the entire GHE length in this study), groundwater flow velocity had the greatest effect on heat flux. With a groundwater flow velocity of at least 10-4 m/s through a low-porosity aquifer filled with gravel with high thermal conductivity, the heat flux of a GHE was as much as 60% higher than that of a non-aquifer GHE. If the aquifer is as thick as 50 m (50% of the entire GHE length), the high thermal conductivity of gravel doubled the heat flux of the GHE with a groundwater flow velocity of at least 10-5 m/s. thus, not only groundwater flow velocity, but also aquifer thickness and thermal conductivity were important factors. However, groundwater seldom flows at such high velocities, and porosity, gravel size, and aquifer thickness vary regionally. thus, in the design of ground source heat pump systems, it is not appropriate to assume a large groundwater effect. Copyright © 2014 by asme.

关键词： Aquifers

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