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INTEGRATED AFS AND DYC SLIDING MODE CONTROLLER design FOR HYBRID ELECTRIC VEHICLE

引用

10th asme biennial conference on engineering systems design and analysis

作者： Mashadi, Behrooz Majidi, Majid Iran Univ Sci & Technol Dept Automot Engn Tehran Iran

ISBN: (纸本)9780791849170

An integrated controller of active front steering and direct yaw moment is developed in this paper. In upper layer, the corrective steering angle and yaw moment are obtained using sliding mode control. A combined sliding surface is defined in order that the yaw rate and side slip angle of vehicle track the desired values. the corrective yaw moments are applied by electrical motors embedded in rear wheels. the desired value for yaw rate and sideslip angle are obtained from a 4-DOF nonlinear vehicle model. In the lower layer, the active steering, wheel slip and electrical motor torque controllers are designed. Wheel slip and motors torque controllers generate the longitudinal forces in the rear wheels to produce the desired yaw moment. A nonlinear nine degrees of freedom vehicle model is used for simulation purposes. the simulation results illustrate considerable improvements in vehicle handling.

关键词： active front steering direct yaw moment vehicle stability control vehicle dynamics hybrid electric vehicle

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3-D FREE VIBRATION analysis OF FUNCTIONALLY GRADED thICK CIRCULAR AND ANNULAR PLATES ON ELASTIC FOUNDATION

引用

10th asme biennial conference on engineering systems design and analysis

作者： Tajeddini, Vahid Ohadi, Abdolreza Sadighi, Mojtaba Amir Kabir Univ Technol Dept Mech Engn Tehran Iran

ISBN: (纸本)9780791849163

this paper describes a study of three-dimensional free vibration analysis of thick circular and annular functionally graded (FG) plates resting on Pasternak foundation. the formulation is based on the linear, small strain and exact elasticity theory. Plates with different boundary conditions are considered and the material properties of the FG plate are assumed to vary continuously through the thickness according to power law. the kinematic and the potential energy of the plate-foundation system are formulated and the polynomial-Ritz method is used to solve the eigenvalue problem. Convergence and comparison studies are done to demonstrate the correctness and accuracy of the present method. With respect to geometric parameters, elastic coefficients of foundation and different boundary conditions some new results are reported which maybe used as a benchmark solution for future researches.

关键词： Potential energy Kinematics Elasticity Plates (structures) Boundary-value problems Polynomials Free vibrations Eigenvalues Materials properties

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INDOOR ENVIRONMENTAL MAPPING BY MEANS OF AUTONOMOUS GUIDED AGENTS

引用

10th asme biennial conference on engineering systems design and analysis

作者： Galetto, Maurizio Mastrogiacomo, Luca Pralio, Barbara Spagnolo, Cristina Politecn Torino Dipartimento Sistemi Prod & Econ Azienda I-10129 Turin Italy

ISBN: (纸本)9780791849170

the indoor environmental monitoring of industrial production sites is becoming increasingly important in an attempt to comply with current regulations inhering working conditions and production standards. Although monitoring tasks often consist of repetitive, time-consuming, and sometimes dangerous actions, they are mostly carried out by a human operator, who is responsible for carrying the sensor set around the working area and for enabling the communication with a remote processing system. the aim of the paper is to present the architecture of an integrated autonomous system for three-dimensional mapping of environmental conditions in indoor spaces. the proposed system integrates one (or more) autonomous guided vehicles, carrying the sensor set around the working area, a distributed wireless sensor network, providing a real-time tracking of the mobile agent, and a remote processing unit to store and elaborate the measured data. A prototype implementation of the system is herein described, in order to demonstrate the overall system feasibility.

关键词： Sensors Vehicles Space engineering prototypes Regulations Wireless sensor networks

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LOOK-AHEAD NURBS-PH INTERPOLATION FOR HIGH SPEED CNC MACHINING

引用

10th asme biennial conference on engineering systems design and analysis

作者： Imani, Behnam Moetakef Ghandehariun, Amirmohammad Ferdowsi Univ Mashhad Dept Mech Engn Mashhad Iran

ISBN: (纸本)9780791849194

Various methods for parametric interpolation of NURBS curves have been proposed in the past. However, the errors caused by the approximate nature of the NURBS interpolator were rarely taken into account. this paper proposes an integrated look-ahead algorithm for parametric interpolation along NURBS curves. the algorithm interpolates the sharp corners on the curve with the Pythagorean-hodograph (PH) interpolation. this will minimize the geometric and interpolator approximation errors simultaneously. the algorithm consists of four different modules: a sharp corner detection module, a PH construction module, a jerk-limited module, and a dynamics module. Simulations are performed to show correctness of the proposed algorithm. Experiments on an X-Y table confirm that the developed method improves tracking and contour accuracies significantly when compared to previously proposed adaptive-feedrate and curvature-feedrate algorithms.

关键词： Algorithms Simulation Computer numerical control machine tools Approximation Dynamics (Mechanics) Interpolation engineering simulation Errors Machining Construction Corners (Structural elements)

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MODELING AND EXPERIMENTAL VERIFICATION OF A NOVEL SMA-ACTUATED ROBOTIC MODULE

引用

10th asme biennial conference on engineering systems design and analysis

作者： Hadi, Alireza Yousefi-Koma, Aghil Elahinia, Mohammad Moghadam, Majid M. Univ Tehran Sch Mech Engn Ctr Excellence Intelligence Based Expt Mech Tehran 111554563 Iran

ISBN: (纸本)9780791849156

Robotic modules with especial abilities may provide new opportunities in developing robotic systems. Changing the robot framework in different missions may be implemented in the modular robotic system design. Shape memory alloys (SMA) may be considered as suitable actuators with unique features. Due to the complex behavior of the SMAs less works are done on the precise modeling and positioning systems of them. Spring type SMA actuators, which are less considered in the literature, produce more deflections. In this paper a novel module with two DOFs is developed. SMA springs are employed as actuators in an embedded package including a mechanism, an electronic hardware, and a sensory system. Modeling of the spring type SMA is discussed in details using Liang and Brinson models. Simulation results are verified using an experimental setup indicating the applicability of the model in predicting the dynamic behavior of the module.

关键词： Simulation results Deflection Hardware Shape memory alloys Modeling Robotics design Springs Robots Actuators

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STATIC PULL-IN analysis OF A CARBON NANO TUBE (CNT)-REINFORCED MICROPLATE UNDER ELECTROSTATIC ACTUATION

引用

10th asme biennial conference on engineering systems design and analysis

作者： Jalali, Amir Khadem, Siamak. E. Tarbiat Modares Univ Dept Mech Engn Tehran Iran

ISBN: (纸本)9780791849194

In this paper, nonlinear vibration characteristics of a viscoelastic microplate under electrostatic actuation have been obtained. the microplate has been assumed as a CNT-reinforced simply supported square plate and an electrostatic actuation applied on it. the nonlinear equations of motion have been derived and solved, by using combined Galerkin method and indeterminate coefficient procedure. Static pull-in instability of the microplate has been also derived. It has been shown that the pull-in voltage, natural frequency and deflection of the system depend on the value of electrostatic actuation and viscoelastic characteristics of the microplate and differ from those obtained in elastic one. So, good selection of composite components (nanotube, base matrix) can result in better controlling of the microplate due to increasing/decreasing of the pull-in voltage.

关键词： Nonlinear vibration Deflection Composite materials Nanotubes Carbon Nonlinear equations Galerkin method Microplates Carbon nanotubes

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thE STABILITY AND CHAOS analysis OF A NONLINEAR WHEELED VEHICLE MODEL UNDER ROAD EXCITATION

引用

10th asme biennial conference on engineering systems design and analysis

作者： Samandari, Hamed Rezaee, Mousa Univ Tabriz Dept Mech Engn Tabriz Iran

ISBN: (纸本)9780791849170

In this paper, the dynamic behavior of a quarter-car with two degree-of-freedom which consists of sprung mass and unsprung mass is examined. Non linearity occurred due to nonlinear hysteretic suspension damper and spring. Vehicle tire is modeled as a nonlinear hardening spring. the disturbance of road assumed to be sinusoid. Frequency response diagram of the model has been obtained. Results show that the dynamic response of the vehicle can be chaotic. Influence of road roughness amplitude on vehicle vibration is investigated and critical amplitude of the road surface profile is found, above which the system can vibrate chaotically. the comparison between the results obtained from the proposed model and those from the single degree-of-freedom quarter-car model shows that the unsprung mass has great influence on the dynamical behavior of the system, which cannot be ignored.

关键词： Pavement Dynamic response Vehicles Excitation Tires Vibration Chaos Dampers Springs Roads Hardening Stability Surface roughness Frequency response Degrees of freedom

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ARTIFICIAL INTELLIGENCE IN analysis OF FAST DYNAMIC ACTIONS

ARTIFICIAL INTELLIGENCE IN ANALYSIS OF FAST DYNAMIC ACTIONS

引用

10th asme biennial conference on engineering systems design and analysis

作者： Stas, Ondrej Tolnay, Marian Magdolen, Lubos FME SUT Slovakia Bratislava 81231 Slovakia

ISBN: (纸本)9780791849170

this paper introduces the application of artificial intelligence base on the artificial neural networks, the parallel computational algorithm for analyzing the nonlinear actions. Two similar applications are studied: the artificial neural network (ANN) trained and simulated for position estimation (position tracking ) and ANN network for velocity estimation. this methodology can be used for various appliances and for generalizaion process. the comparison in time of processing for classical analyses and AI analyses differs, depending on the type of computational hardware used for analyze. Generally it could be said that AI solution is time less time-consuming than the standard algorithmic and propose results in quasi real time without need of signal preprocessing. As an experimental solution, this proposes future trends in vision signal processing where the classical methods are replaced by the artificial intelligence, which is not always the correct direction, but as we can see in this method possible.

关键词： Artificial neural networks Algorithms Artificial intelligence Signal processing Hardware Signals

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NUMERICAL STUDY OF thE WORKPIECE ROTATION EFFECT ON thE STRAIN AND RESIDUAL STRESS DISTRIBUTION IN thE COLD RADIAL FORGING PROCESS

NUMERICAL STUDY OF THE WORKPIECE ROTATION EFFECT ON THE STRA...

引用

10th asme biennial conference on engineering systems design and analysis

作者： Afrasiab, H. Movahhedy, M. R. Sharif Univ Technol Sch Mech Engn Tehran Iran

ISBN: (纸本)9780791849187

Radial forging is an open die forging process used for reducing the diameters of shafts, tubes, stepped shafts and axels, and for creating internal profiles in tubes. In this study, the effect of the workpiece rotation (the circumferential feed) on the strain and residual stress distribution in the inner surface of the tube in the cold radial forging process is investigated using nonlinear three dimensional finite element modeling. To verify the model, the predicted radial forging load is compared with the published experimental data which shows a good agreement. It is shown that for achieving a more favorable residual stress distribution in the workpiece inner surface, the rotation angle associated with each stroke should be reduced. Furthermore, a total rotation angle of 90 degrees seems to be sufficient for finalizing the strain and residual stress distribution in the workpiece inner surface and using additional rotation is just a waste of time and energy in this respect.

关键词： Finite element analysis Stress Rotation Forging Modeling Stress concentration

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SENSOR FUSION FOR ATTITUDE AND BIAS ESTIMATION FOR A VTOL UAV

引用

10th asme biennial conference on engineering systems design and analysis

作者： Metni, Najib A. Notre Dame Univ Dept Mech Engn Zouk Mosbeh Lebanon

ISBN: (纸本)9780791849194

In this paper, a nonlinear complementary filter is presented to estimate the attitude of a Vertical Take Off and Landing Unmanned Aerial Vehicle (VTOL UAV). the measurements are taken from a low-cost IMU (Inertial Measurement Unit) which consists of 3-axis accelerometers, 3-axis gyroscopes and 3-axis magnetometers. From the proposed estimators, the full orientation matrix R will be retrieved. the proposed observers will estimate the instantaneous quaternions as well as the gyroscope bias. this representation of orientation by the rotation matrix and quaternions allows overcoming the problem of singularities that appear in local parametrization such as Euler angles. therefore, both estimators may be used to describe any kind of 3-D motion. Convergence of the two observers is theoretically proved and simulations are conducted taking data from a real platform in hovering flight conditions.

关键词： Simulation Sensors Accelerometers engineering simulation Flight Filters Measurement units and standards Magnetometers Rotation Unmanned aerial vehicles

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