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CONTROL thEORY IN PRACTICE: MAGNETIC LEVITATION

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10th asme biennial conference on engineering systems design and analysis

作者： Rogers, John Rabb, Robert US Mil Acad West Point NY 10996 USA

ISBN: (纸本)9780791849163

A device that levitates a steel ball beneath an electromagnet is used for educational purposes at the United States Military Academy, West Point, New York. Students in the course "Mechatronics" engage in a set of laboratory exercises with the device to reinforce classroom learning. Mechatronics is a senior-level course that introduces the interdisciplinary design of smart systems. Students in the electrical engineering and mechanical engineering programs take the course together, and the material is taught by a team of instructors from both academic departments. the Magnetic Levitation experiments are the primary means of teaching the classical analog control portion of the course. Other aspects of the course involve interfacing microcontrollers with sensors and actuators, and digital control. the magnetic levitation device fits easily on a two-person workbench and requires a power supply and oscilloscope. An infra-red emitter / detector pair is used to sense ball position for a feedback compensator. Students first learn classical control theory in a co-requisite course, "Dynamic Modeling and Control." Modeling principles are introduced in the context of the magnetic levitation system as an unstable plant to be controlled. the system can be simulated by models ranging from simply linear to more complex to teach the trade-off between model fidelity and model development effort. the students derive the nonlinear governing equations and then linearize the equations and develop the transfer function of the plant. Students design a compensator and simulate the resulting stabilized system with Matlab and Simulink software. Students build their compensator on a solderless project board to levitate the steel ball. A proven lead-type compensator using two resistors and a capacitor is readily provided to students that struggle with their own compensator design so that all teams may enjoy the fruit of a successful experiment. As a laboratory aid, the magnetic levitation system

关键词： Transfer functions Electromagnets Resistors Feedback Sensors Mathematics Teams design Control theory Students Computer software Military systems Gravity (Force) Dynamic modeling Electrical engineering Modeling Tradeoffs Oscilloscopes Steel Matlab Mechanical engineering Model development Magnetic levitation Teaching Capacitors Mechatronics Actuators

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SECOND LAW analysis OF NANOFLUID FLOW thROUGH CIRCULAR PIPE

SECOND LAW ANALYSIS OF NANOFLUID FLOW THROUGH CIRCULAR PIPE

引用

10th asme biennial conference on engineering systems design and analysis

作者： Shokouhmand, H. Moghaddami, M. Siavashi, M. Univ Tehran Dept Mech Eng Tehran Iran

ISBN: (纸本)9780791849163

this paper aims to numerically investigate the effects of adding nanoparticles on the entropy generation of water-Al2O3 nanofluid flows through a circular pipe under constant wall temperature also constant heat flux thermal boundary conditions in laminar regime. Approved formulations of mixtures are used for density and specific heat of the nanofluids. Nanofluid model proposed by Koo and Kleinstreuer [1] based on experimental data of Das et al. [2] is employed for conductivity of the nanofluids and an experimental correlation presented by Rea et al. [3] is used to model the viscosity of the nanofluid. the problem has been simulated numerically using a CFD finite-volume code and results are validated with the available experimental data. It is found that for the case of constant heat flux boundary condition, adding nanoparticles decreases the entropy generation and improves the thermal performance of water-Al2O3 flow. Moreover optimum Reynolds number to minimize the ratio of nanofluid entropy generation number to water is obtained for this case. For the case of wall constant temperature boundary condition, adding nanoparticles to water leads to heat flux increase, therefore the entropy generation number remains approximately constant.

关键词： Temperature Water Data acquisition systems Density thermal conductivity Viscosity Pipes Nanoparticles Electrical conductivity Computational fluid dynamics Nanofluids Flow (Dynamics) Specific heat Wall temperature Reynolds number Entropy Boundary-value problems Heat flux

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ON ACTIVE DIAGNOSTICS MEthOD FOR ASSESSMENT OF TECHNICAL CONDITION OF NUCLEAR FACILITY COMPONENTS

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10th asme biennial conference on engineering systems design and analysis

作者： Spirochkin, Yury Odintsev, Igor Atroshenkov, Roman Engn Ctr Nucl Equipment Strength ENES Moscow Russia

ISBN: (纸本)9780791849163

An active diagnostics method intended for identification of technical condition of pipelines and other components of nuclear facilities is considered. this method is based on detection of structural anomalies in components by observing changes in static and dynamic behavior of component structure which are registered during special tests. Static behavior is analyzed as response to time-independent mechanical or temperature loading. Dynamic behavior can be analyzed through studying fields of vibration displacements, velocities and accelerations when sinusoidal mechanical oscillations are generated. Structural anomalies can be presented as deviations of stiffness, geometry and inertial parameters from their nominal (design) values. Impact of these deviations on structural response may be bigger in spatial scale than anomaly dimensions. therefore there is a theoretical possibility to detect structural anomaly in the areas which are inaccessible for direct observing by registration of structure response parameters in observable areas. the paper describes the theoretically basis and results of the experimental and numerical studies on detection of a hidden crack-like anomaly in pipe components. Experimental study of dynamic and static response is carried out by coherent optical methods, and numerical analysis by finite element method. theoretical and experimental data have a good agreement and allow to reveal anomaly position and to estimate roughly its dimensions. Application of the method to welded joint in pipe specimen which corresponds to real nuclear facility pipeline is under investigation now.

关键词： Welded joints Temperature Stiffness Dimensions Vibration Numerical analysis Structural response analysis design Geometry Fracture (Materials) Nuclear power stations Oscillations Pipelines Pipes Finite element methods

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Fatigue Reliability Assessment of Marine Risers in Deep Offshore Fields in Indian Ocean

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10th asme biennial conference on engineering systems design and analysis

作者： Khan, Rizwan A. Ahmad, Suhail Natl Inst Technol Dept Civil Engn Jalandhar 144011 Punjab India

ISBN: (纸本)9780791849163

Depleting oil reserves in shallow water are opening the avenues of new ventures in deep sea conditions. India is no exception;deep sea explorations are highly recommended and exercised. As part of the design process, there are requirements of structural strength based on criteria referring to failure modes, such as rupture by over loading, fatigue failures, buckling or an unstable fracture. 3D Nonlinear dynamic analysis of riser is obtained in the time domain using finite element solver ABAQUS/Aqua. the response histories so obtained are employed for the study of fatigue reliability analysis of riser. It is based on a bi-linear relationship to model fatigue crack growth and incorporates a failure criterion to describe the interaction between fracture and plastic collapse. Uncertainty modeling, especially on fatigue crack growth parameters, is undertaken with the aid of recently published data in support of the bi-linear crack growth relationship. Results pertaining to fatigue reliability and fatigue crack size evolution are presented using Monte Carlo Simulation. the bi-linear S-N curve and crack growth models are found to lead to higher fatigue life estimation. Sensitivity behavior pertinent to limit state adopted has been thoroughly investigated. these Findings implicate inspection schemes for components of the marine structures to ensure minimization of the surprises due to wide scatter of the fatigue phenomenon in marine environment.

关键词： Marine structures Fatigue life Ocean engineering Water Simulation Pipeline risers design Electromagnetic scattering Dynamic analysis Fracture (Materials) Collapse Reliability Finite element analysis Uncertainty Indian Ocean Modeling Rupture Inspection Seas Fatigue cracks Fatigue Risers (Casting) Failure mechanisms Buckling Event history analysis Fatigue failure Marine drilling risers Failure

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BUCKLING analysis OF thIN FUNCTIONALLY GRADED RECTANGULAR PLATES RESTING ON ELASTIC FOUNDATION

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10th asme biennial conference on engineering systems design and analysis

作者： Mohammadi, Meisam Saidi, A. R. Mohammadi, Mehdi Islamic Azad Univ Kerman Branch Dept Mech Engn Kerman Iran

ISBN: (纸本)9780791849163

In the present article, the buckling analysis of thin functionally graded rectangular plates resting on elastic foundation is presented. According to the classical plate theory, (Kirchhoff plate theory) and using the principle of minimum total potential energy, the equilibrium equations are obtained for a functionally graded rectangular plate. It is assumed that the plate is rested on elastic foundation, Winkler and Pasternak elastic foundations, and is subjected to in-plane loads. Since the plate is made of functionally graded materials (FGMs), there is a coupling between the equations. In order to remove the existing coupling, a new analytical method is introduced where the coupled equations are converted to decoupled equations. therefore, it is possible to solve the stability equations analytically for special cases of boundary conditions. It is assumed that the plate is simply supported along two opposite edges in x direction and has arbitrary boundary conditions along the other edges (Levy boundary conditions). Finally, the critical buckling loads for a functionally graded plate with different boundary conditions, some aspect ratios and thickness to side ratios, various power of FGM and foundation parameter are presented in tables and figures. It is concluded that increasing the power of FGM decreases the critical buckling load and the load carrying capacity of plate increases where the plate is rested on Pasternak in comparison with the Winkler type.

关键词： Load bearing capacity Potential energy Functionally graded materials Plates (structures) Boundary-value problems Plate theory Stability Equilibrium (Physics) Buckling Stress

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Entropy based classification of road-profiles

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asme 2010 10th biennial conference on engineering systems design and analysis (ESDA2010)

作者： Caglar Baslamisli, S. Önel, Selis Department of Mechanical Engineering Hacettepe University Beytepe Ankara 06800 Turkey Department of Chemical Engineering Hacettepe University Beytepe Ankara 06800 Turkey

ISBN: (纸本)9780791849187

In this study, the Shannon entropies of six different road-profiles ranging from "very good asphalt road" to "dirt road (terrain)" were calculated. Results indicate that each type of road has a well defined entropy value and that the entropies of roads ranging from "very good asphalt" to "dirt road (terrain)" lie on a nearly linear locus. A second approach presented in this paper consists in measuring the sprung mass vertical acceleration of a vehicle running over segments of roads of different qualities and calculating the entropies of the acceleration signals. this procedure has been applied to assess the influence of nonlinear damping and vehicle speed. It has been seen that it is possible to identify the type of the road surface through the calculation of entropy if the vehicle operating parameters are known. Finally, it is observed that the locus of entropy values is concave on the plot of acceleration entropy versus root mean square (RMS) acceleration. Copyright © 2010 by asme.

关键词： Vehicles

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Experimental analysis of Internal Heat Exchanger for Automotive A/C System

引用

10th asme biennial conference on engineering systems design and analysis

作者： Bahrami, Salman Beigi, Hasan Mohammad Sabour, Mohammad Hosein SardSaz Khodro Co R&D Div Tehran Iran

ISBN: (纸本)9780791849163

In this paper, a new designed internal heat exchanger (suction-liquid line heat exchanger) for R134a automotive air conditioning system is proposed, and is studied experimentally. the approval is done by calorimeter test apparatus, which provides conditions close to real automotive A/C system operation. In this design, the high-pressure liquid passes through central channel and the low-pressure vapor flows in several parallel channels in the opposite direction. the results show that in all conditions, internal heat exchanger adoption will increase the condenser real capacity. therefore, smaller condensers can be used to reach the same capacities. Using the designed internal heat exchanger will decrease the needed mass flow rate. In a constant mass flow rate, internal heat exchanger adoption will increase evaporator capacity. In all concluded tests, the compressor power consumption was decreasing by internal heat exchanger adoption;it was intensifying at higher air temperature passing through the condenser. Using this internal heat exchanger will decrease compressor power consumption up to 6%, and will increase mostly the coefficient of performance. the condenser higher air temperature will increase the coefficient of performance and its improvement with internal heat exchanger. In this case the coefficient of performance can increase up to 8.4%, and will enhance subcooled degree at expansion valve inlet up to 12.8 degrees C.

关键词： High pressure (Physics) Flow (Dynamics) Suction Temperature Vapors Subcooling Valves Experimental analysis Condensers (steam plant) Air conditioning Pressure design Heat exchangers Energy consumption Compressors

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A novel method for robust control using taguchi method and genetic algorithm in QFT controller

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asme 2010 10th biennial conference on engineering systems design and analysis (ESDA2010)

作者： AkbarAkbari, Ali Samiee, Amir Homayun Amini, Pouria Naeemi Fallah, Danial Mechanical Engineering Ferdowsi University of Mashhad Khorasan Iran Mechanical Engineering Azad University Mashhad Khorasan Iran

ISBN: (纸本)9780791849170

this paper proposes a novel method to design and optimize a robust controller for a SCARA robot using quantitative feedback theory (QFT). In every physical system, there are number of factors that cause uncertainty in the performance. A robot arm is an example of such systems. Although QFT design technique has been successfully used for plants having structured parameter uncertainty, there are some difficulties that a designer encounters. In this paper we investigated the effects of parameter uncertainties of a SCARA robot on frequency response of open loop system. Taguchi's experimental design technique is used for determination of the uncertain parameters, which have the greatest influence on the outcome through a very limited number of experiments. With consideration of important parameters, the next step in QFT design procedure is loop-shaping. In the presented method the controller is designed directly by choosing and optimization of coefficients of transfer function by using genetic algorithm. In optimization procedure, stability and bounds of the system were considered as the constraints of the problem. Non-linear simulations on the tracking problem are performed and the results highlight the success of the designed controllers. the results indicate that applying the proposed technique successfully overcomes the obstacles to robust control of non-linear SCARArobots. © 2010 by asme.

关键词： Controllers

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FAST AFM SCANNING WIth PARAMETER SPACE BASED ROBUST REPETITIVE CONTROL designED USING thE COMES TOOLBOX

FAST AFM SCANNING WITH PARAMETER SPACE BASED ROBUST REPETITI...

引用

10th asme biennial conference on engineering systems design and analysis

作者： Necipoglu, Serkan Demirel, Burak Guvenc, Levent Istanbul Tech Univ Mekar Mech Res Labs Dept Mech Engn TR-80626 Istanbul Turkey KTH Royal Sch Technol Stockholm Sweden

ISBN: (纸本)9780791849194

Atomic Force Microscope (AFM) is a very strong and beneficial instrument for acquiring images at nanometer scale. Hence, obtaining better image quality and scan speed is a research area of great interest. Improving the dynamic responses of the scanning probe and the vertical motion of the scanner mechanisms are the two major areas of concentration in this sense. Improving the vertical dynamics is achieved either by designing more complex scanner mechanisms with higher bandwidth or designing more sophisticated controllers rather than the PI, PID or PhD types of controllers that are mostly used in practice. In this paper, the authors focus on designing a repetitive control scheme for fast and accurate scanning. It is possible to implement repetitive control to achieve this goal when it is considered that the successive lines of the scan are quite similar due to the very small steps taken to advance on the sample. Repetitive control can reject higher frequency disturbances due to the surface topography in AFM much better than a conventional controller can, as it can drive the error caused by any periodic input signal to zero. Besides increasing the scan speed, it is also important that the phase lag can be compensated perfectly using repetitive control, with the knowledge of the surface topography from the previous period by introducing appropriate phase advance.

关键词： Atomic force microscopy Control equipment Errors Signals Probes design Instrumentation Dynamic response Dynamics (Mechanics) Nanoscale phenomena

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MODELING OF NON-NEWTONIAN FLUID FLOW WIthIN SIMPLEX ATOMIZERS

MODELING OF NON-NEWTONIAN FLUID FLOW WITHIN SIMPLEX ATOMIZER...

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10th asme biennial conference on engineering systems design and analysis

作者： Rezaeimoghaddam, Mohammad Elahi, Rasool Razavi, M. R. Modarres Ayani, Mohammad B. Ferdowsi Univ Mashhad Dept Mech Engn Mashhad Iran

ISBN: (纸本)9780791849170

In this paper the Volume-of-Fluid (VOF) method is used to simulate Newtonian and non-Newtonian fluid flow within simplex (pressure-swirl) atomizers. the two-dimensional axisymmetric swirl Navier-Stokes equations coupled with the VOF method is employed for accounting the formation mechanism of the liquid film inside the swirl chamber and the orifice hole of the pressure swirl atomizer For verification of the code, the numerical results were compared with experimental data for large scale prototype injector with water (Newtonian fluid) as injection fluid in various constant inlet mass flow rate. By using power-law equation to calculate shear stress terms in the Navier-Stokes equations, the code is extended to compute Newtonian and non-Newtonian fluid flow inside the atomizer the time-independent purely viscous power-law fluids flow in pressure-swirl atomizers is simulated. the effects of shear-thinning fluids (0.5 < n <1), viscous Newtonian (n = 1) fluids and shear thickening fluids (I< n < 1.5) on atomizers performance (discharge coefficient and spray cone angle) were investigated. Results were shown that with increasing the power-law index the spray cone angle decreases and the discharge coefficient increases.

关键词： Flow (Dynamics) Non-Newtonian fluids Pressure Navier-Stokes equations Modeling Discharge coefficient Fluids Liquid films Shear stress Water Ejectors Accounting Sprays Shear (Mechanics) engineering prototypes

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