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    Modular framework kinematic and fuzzy reward reinforcement learning analysis of a radially symmetric six-legged robot

    , Article Life Science Journal ; Volume 10, Issue SUPPL 8 , 2013 , Pages 120-129 ; 10978135 (ISSN) Shahriari, M ; Osguie, K. G ; Khayyat, A. A. A ; Sharif University of Technology
    Hexapod robots gives us the ability to study walking robots without facing problems such as stability in many aspects. It has a great deal of flexibility in movement even if a leg becomes malfunctioned. Radially symmetric (hexagonal) hexapods have more flexibility in movement than rectangular leg alignments. Because of symmetry they can move in any direction and time efficiently. Inverse kinematic problem of this kind of hexapods is solved through a modular mobile view considering six degrees of freedom for the trunk. Then typical tripod and wave gaits are analyzed and simulated through the presented formulation. In Reinforcement Learning algorithm for walking it is important how to make... 

    A new 3D potential-density basis set

    , Article Proceedings of the International Astronomical Union ; Volume 3, Issue S245 , 2007 , Pages 37-38 ; 17439213 (ISSN) Rahmati, A ; Jalali, M. A ; Sharif University of Technology
    A set of bi-orthogonal potential-density basis functions is introduced to model the density and its associated gravitational field of three dimensional stellar systems. Radial components of our basis functions are weighted integral forms of spherical Bessel functions. We discuss on the properties of our basis functions and demonstrate their shapes for the latitudinal Fourier number l = 2. © 2008 Copyright International Astronomical Union 2008  

    Design, modeling and kinematics analysis of a novel serial/parallel pole climbing and manipulating robot

    , Article Proceedings of the 7th Biennial Conference on Engineering Systems Design and Analysis - 2004, Manchester, 19 July 2004 through 22 July 2004 ; Volume 2 , 2004 , Pages 399-408 ; 0791841731 (ISBN); 9780791841730 (ISBN) Vossoughi, G. R ; Bagheri, S ; Tavakoli, M ; Zakerzadeh, M. R ; Hosseinzadeh, M ; Sharif University of Technology
    American Society of Mechanical Engineers  2004
    This paper introduces a multi-task 4 DOF pole climbing/ manipulating robotic mechanism. A hybrid serial/parallel mechanism, providing 2 translations and 2 rotations, have been designed as the main part of the mechanism. This robotic mechanism can travel along tubular structures with bends, branches and step changes in cross section. It is also able to perform manipulation, repair and maintenance tasks after reaching the target point on the structure. After introducing the mechanism, a kinematics model and the forward and inverse kinematics as well as the workspace analysis of the mechanism are presented  

    Kinematic and dynamic sensitivity analysis of a three-axis rotary table

    , Article Proceedings of 2003 IEEE Conference on Control Applications, Istanbul, 23 June 2003 through 25 June 2003 ; Volume 2 , 2003 , Pages 1147-1152 Alasty, A ; Abedi, H ; Sharif University of Technology
    Three-axis rotary table is a flight motion simulator (FMS) used in the hardware in the loop (HWIL) simulation. Geometrical Modeling of 3-axis rotary tables is described and then three possible Geometrical layouts are driven. Kinematic and dynamic modelings of a 3-axis rotary table are developed in this paper. Denavit-Hartenberg (D-H) method, Recursive Newton-Euler (RNE) and Lagrange methods are used, respectively, in kinematic and dynamic modeling. A kinematic Error analysis is applied to determine the orientation and position accuracy of the table. Dynamic sensitivity analysis is also performed and the first-order sensitivity functions are derived corresponding several dynamic and control... 

    Dynamic modeling and analysis of a two d.o.f. mobile manipulator

    , Article Robotica ; Volume 19, Issue 2 , 2001 , Pages 177-185 ; 02635747 (ISSN) Naderi, D ; Meghdari, A ; Durali, M ; Sharif University of Technology
    This paper presents the kinematic and dynamic modeling of a two degrees of freedom manipulator attached to a vehicle with a two degrees of freedom suspension system. The vehicle is considered to move with a constant linear speed over an irregular ground-surface while the end-effector tracks a desired trajectory in a fixed reference frame. In addition, the effects of highly coupled dynamic interaction between the manipulator and vehicle (including the suspension system's effects) have been studied. Finally, simulation results for the end-effector's straight-line trajectory are presented to illustrate these effects  

    Discrete kinematic synthesis of discretely actuated hyper-redundant manipulators

    , Article Robotica ; Volume 31, Issue 7 , 2013 , Pages 1073-1084 ; 02635747 (ISSN) Motahari, A ; Zohoor, H ; Korayem, M. H ; Sharif University of Technology
    Discrete kinematic synthesis of discretely actuated hyper-redundant manipulators is a new practical problem in robotics. The problem concerns with determining the type of each manipulator module from among several specific types, so that the manipulator could reach several specified target frames with the lowest error. This paper suggests using a breadth-first search method and a workspace mean frame to solve this problem. To reduce errors, two heuristic ideas are proposed: two-by-two searching method and iteration. The effectiveness of the proposed method is verified through several numerical problems  

    A geometrical approach for configuration and singularity analysis of a new non-symmetric 2DOF 5R spherical parallel manipulator

    , Article Mechanism and Machine Theory ; Volume 147 , 2020 Alamdar, A. R ; Farahmand, F ; Behzadipour, S ; Mirbagheri, A. R ; Sharif University of Technology
    Elsevier Ltd  2020
    A new non-symmetric 5R-SPM is introduced and a geometrical approach is developed to analyze its configurations and singularities. The proposed methodology determines the type of configuration of a 5R-SPM, i.e. regular, singular, or out-of-workspace and also the type of singularity, i.e. instantaneous or finite, only based on geometric parameters and without solving verbose kinematic equations. It also provides insights into the workspace and singularities of 5R-SPMs, in the preliminary stage of design. The mechanism was analyzed by both the new geometrical approach and conventional methods for comparison. The geometrical approach could intuitively detect all the singularities observed by the... 

    Structural Synthesis of a Family of 5D of 3T2R Parallel Mechanisms, and Analysis of the Superior One

    , M.Sc. Thesis Sharif University of Technology Motevalli Somehsaraei, Benyamin (Author) ; Zohoor, Hassan (Supervisor) ; Sohrabpour, Saeed (Supervisor)
    The primary objective of this dissertation is to obtain a mechanism from the family of 5-dof parallel mechanisms of type 3T2R which gains the advantages of higher kinematic performance, low coupling of motion, and simple kinematics and control commands. Based on this aim, at first a method for structural synthesis of this type of mechanisms is introduced. The method is based on the theory of linear transformation and a geometrical analysis. By using this method, a set of novel 5-dof 3T2R parallel mechanism are introduced for the first time in the literature. In order to compare the designed mechanisms and to identify the promising ones, some important criteria which are a) low coupling... 

    The MOG weak field approximation and observational test of galaxy rotation curves

    , Article Monthly Notices of the Royal Astronomical Society ; Volume 436, Issue 2 , December , 2013 , Pages 1439-1451 ; 00358711 (ISSN) Moffat, J. W ; Rahvar, S ; Sharif University of Technology
    As an alternative to dark matter models, Modified Gravity (MOG) theory is a covariant modification of Einstein gravity. The theory introduces two additional scalar fields and one vector field. The aim is to explain the dynamics of astronomical systems based only on their baryonic matter. The effect of the vector field in the theory resembles a Lorentz force where each particle has a charge proportional to its inertial mass. The weak field approximation of MOG is derived by perturbing the metric and the fields around Minkowski space-time. We obtain an effective gravitational potential which yields the Newtonian attractive force plus a repulsive Yukawa force. This potential, in addition to the... 

    Full order neural velocity and acceleration observer for a general 6-6 Stewart platform

    , Article Conference Proceeding - 2004 IEEE International Conference on Networking, Sensing and Control, Taipei, 21 March 2004 through 23 March 2004 ; Volume 1 , 2004 , Pages 333-338 ; 0780381939 (ISBN) Durali, M ; Shameli, E ; Sharif University of Technology
    The aim of this work is to combine different innovative methods to solve the forward kinematics (FK) problem in a parallel manipulator called Stewart platform. It leads to the solution of a set of simultaneous non-linear equations and results in a series of non-unique multiple sets of solutions. Many efforts have been made to solve this challenging problem and usually results in having to find the solution of a 16th order polynomial by means of numerical methods such as Hooks-Jeeves, Steepest descent search and Newton-Raphson method (NR). Accuracy, speed and convergence of these methods are fully dependent to the initial guess vector that is fed to the numerical algorithm. In this paper, a... 

    Evaluation of trunk muscle forces and internal loads using kinematics-based modeling

    , Article Proceedings of the IASTED International Conference on Biomedical Engineering, Salzburg, 25 June 2003 through 27 June 2003 ; 2003 , Pages 114-119 ; 0889863539 (ISBN) Shirazi Adl, A ; El-Rich, M ; Parnianpour, M ; Sharif University of Technology
    Trunk muscle forces and internal loads are computed under simulated standing postures while carrying a load using a nonlinear finite element model of the T1-S1 spine with realistic nonlinear load-displacement properties. A novel kinematics-based algorithm is applied that exploits a set of a priori known spinal sagittal rotations to solve the redundant active-passive system. The loads consist of upper body gravity distributed along the spine plus 200 N held in hands either in front or on sides. Predictions are in good agreement with reported measurements of posture, muscle EMG and intradiscal pressure. Minimal changes in posture (posterior pelvic tilt and lumbar flattening) substantially... 

    Muscle force evaluation and the role of posture in human lumbar spine under compression

    , Article European Spine Journal ; Volume 11, Issue 6 , 2002 , Pages 519-526 ; 09406719 (ISSN) Shirazi Adl, A ; Sadouk, S ; Parnianpour, M ; Pop, D ; El-Rich, M ; Sharif University of Technology
    Using two nonlinear finite element models of the lumbar spine, the concept of optimal posture is explored by minimizing the segmental sagittal moments required for the equilibrium of the passive lumbar spine under a total of 2800 N axial compression while varying the pelvic tilt and lumbar lordosis. The redundant active-passive system is subsequently solved for this posture using a novel kinematics-based muscle calculation algorithm along with minimization approach. Some flattening in the lumbar spine substantially reduces the required moments and internal passive shear forces under 2800 N axial compression force. Small muscle forces are calculated for this optimal posture. The role of... 

    Kinematic analysis of the spherically actuated platform manipulator

    , Article 2007 IEEE International Conference on Robotics and Automation, ICRA'07, Rome, 10 April 2007 through 14 April 2007 ; May , 2007 , Pages 175-180 ; 10504729 (ISSN); 1424406021 (ISBN); 9781424406029 (ISBN) Pendar, H ; Vakil, M ; Fotouhi, R ; Zohoor, H ; Sharif University of Technology
    New methods for the Inverse and forward kinematic analysis of the novel six Degrees of Freedom (6DOF) parallel manipulator which has only two legs are presented. The actuation of the new mechanism is through two base-mounted spherical actuators. In the inverse pose kinematic, active joint variables are directly calculated with no need for the evaluation of passive joint variables. In the forward pose kinematic, closed form solution adopting a new approach is presented. It is shown that the inverse and forward pose kinematic have sixteen and four different solutions, respectively. Moreover, closed form equations for the rate kinematic analysis are proposed. Finally, two different categories... 

    A three-invariant cap plasticity model with kinematic hardening rule for powder materials

    , Article Journal of Materials Processing Technology ; Volume 187-188 , 2007 , Pages 680-684 ; 09240136 (ISSN) Khoei, A. R ; DorMohammadi, H ; Azami, A. R ; Sharif University of Technology
    In this paper, a three-invariant cap plasticity with a kinematic hardening rule is presented for powder materials. A general form is developed for the cap plasticity which can be compared with some common double-surface plasticity models proposed for powders in literature. The constitutive elasto-plastic matrix and its components are derived based on the definition of yield surface, hardening parameter and non-linear elastic behavior, as function of relative density of powder. The procedure for determination of powder parameters is described. Finally, the applicability of the proposed model is demonstrated in numerical simulation of triaxial and confining pressure tests. © 2006 Elsevier B.V.... 

    Corotational analysis of elastic-plastic hardening materials based on different kinematic decompositions

    , Article ASME PVP2006/ICPVT-11 Conference, Vancouver, BC, 23 July 2006 through 27 July 2006 ; Volume 2006 , 2006 ; 0277027X (ISSN) ; 0791837823 (ISBN); 9780791837825 (ISBN) Ghavam, K ; Naghdabadi, R ; Sharif University of Technology
    In this paper, two corotational modeling for elastic-plastic, mixed hardening materials at finite deformations are introduced. In these models, the additive decomposition of the strain rate tensor as well as the multiplicative decomposition of the deformation gradient tensor is used. For this purpose, corotational constitutive equations are derived for elastic-plastic hardening materials with the non-linear Armstrong-Frederick kinematic hardening and isotropic hardening models. As an application of the proposed constitutive modeling, the governing equations are solved numerically for the simple shear problem with different corotational rates and the stress components are plotted versus the... 

    Control of multi-agent systems based on redundant manipulator global optimization techniques

    , Article 2006 IEEE International Conference on Systems, Man and Cybernetics, Taipei, 8 October 2006 through 11 October 2006 ; Volume 3 , 2006 , Pages 2499-2504 ; 1062922X (ISSN); 1424401003 (ISBN); 9781424401000 (ISBN) Sadati, N ; Elhamifar, E ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2006
    In this paper, a new approach for path generation and control of multi-agent systems is proposed. This method is based on global optimization techniques used for solving the inverse kinematic problem of redundant manipulators. Convergence of any performance function such as obstacle avoidance, collision avoidance, and heading angle to its global optimum is guaranteed by introducing a control law which is based on the Pontryagin's Maximum Principle. The efficacy of the proposed algorithm is demonstrated through simulation experiments. © 2006 IEEE  

    On the different actuation's ways of the spherically actuated platform manipulator

    , Article DETC2005: ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, Long Beach, CA, 24 September 2005 through 28 September 2005 ; Volume 7 B , 2005 , Pages 785-792 ; 0791847446 (ISBN); 9780791847442 (ISBN) Vakil, M ; Pendar, H ; Zohoor, H ; Sharif University of Technology
    American Society of Mechanical Engineers  2005
    In this article kinematic analysis of a 3 Leg-Spherically Actuated (3SA) parallel manipulator will be addressed. Since each leg has a spherical actuator (three inputs for each leg) and manipulator has three legs; totally, there are nine inputs. Due to the fact that the manipulator has six degree of freedom, only six independent inputs are needed. Thus actuation could be done in different ways. If the triangles representing base and platform are equilateral, there are twenty different ways of actuation that should be studied during forward kinematic analysis. Rather than adopting the standard Denavit-Hartenberg approach, a simple method for forward kinematic analysis for all these different... 

    Investigation of a hybrid kinematic calibration method for the 'sina' surgical robot

    , Article IEEE Robotics and Automation Letters ; Volume 5, Issue 4 , 2020 , Pages 5276-5282 Alamdar, A ; Samandi, P ; Hanifeh, S ; Kheradmand, P ; Mirbagheri, A. R ; Farahmand, F ; Sarkar, S ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2020
    Calibrating the inverse kinematics of complex robots is often a challenging task. Finding analytical solutions is not always possible and the convergence of numerical methods is not guaranteed. The model-free approaches, based on machine learning and artificial intelligence, are fast and easy to work, however, they need a huge amount of experimental training data to provide acceptable results. In this article, we proposed a hybrid method to benefit the advantage of both model-based and model-free approaches. The forward kinematics of the robot is calibrated using a model-based approach, and its inverse kinematics using a neural network. Hence, while there is no need to solve the nonlinear... 

    Inverse and forward dynamics of N-3RPS manipulator with lockable joints

    , Article Robotica ; 2015 ; ISSN: 02635747 Taherifar, A ; Salarieh, H ; Alasty, A ; Honarvar, M ; Sharif University of Technology
    The N-3 Revolute-Prismatic-Spherical (N-3RPS) manipulator is a kind of serial-parallel manipulator and has higher stiffness and accuracy compared with serial mechanisms, and a larger workspace compared with parallel mechanisms. The locking mechanism in each joint allows the manipulator to be controlled by only three wires. Modeling the dynamics of this manipulator presents an inherent complexity due to its closed-loop structure and kinematic constraints. In the first part of this paper, the inverse kinematics of the manipulator, which consists of position, velocity, and acceleration, is studied. In the second part, the inverse and forward dynamics of the manipulator is formulated based on... 

    A new obstacle avoidance method for discretely actuated hyper-redundant manipulators

    , Article Scientia Iranica ; Volume 19, Issue 4 , August , 2012 , Pages 1081-1091 ; 10263098 (ISSN) Motahari, A ; Zohoor, H ; Habibnejad Korayem, M ; Sharif University of Technology
    Elsevier  2012
    In this paper, a new method is proposed for solving the obstacle avoidance problem of discretely actuated hyper-redundant manipulators. In each step of the solution, the closest collision to the base is removed and then the configuration of the next part of the manipulator is modified without considering the obstacles. This process is performed repeatedly until no collision is found. The Suthakorn method is applied to solve the inverse kinematics problem. Two new ideas are proposed to reduce the errors of this method: the two-by-two searching method, and iterations. To verify the proposed method, some problems are solved numerically for 2D and 3D manipulators, each in two different obstacle...