Optimal behaviour inspired fuzzy controller design for a three joint robot leg in protraction phase

A fuzzy controller design is performed for a three joint robot leg in protraction phase. The aim is to develop a controller to carry the tip point to any given destination. The design is based on the inspirations derived from optimal behaviors of the leg. The optimal trajectories are obtained by using optimization methods of "numeric gradient" and "optimal control" successively. Separate fuzzy controllers are designed for each actuator. In writing the rules each actuator is considered to be an independent agent of the leg system. The protraction motion is divided into two epochs. For each epoch different controller systems are designed to switch from one to the other in between. The crucial idea in this work is the "multi agent perspective" in designing separate fuzzy controllers for the separate joints. The results of the overall controller system are successful in carrying the tip point to any given destination, following a path resembling the optimal one.


Intelligent gait control of a multilegged robot used in rescue operations
Karalarlı, Emre; Erkmen, Aydan Müşerref; Erkmen, İsmet; Department of Electrical and Electronics Engineering (2003)
In this thesis work an intelligent controller based on a gait synthesizer for a hexapod robot used in rescue operations is developed. The gait synthesizer draws decisions from insect-inspired gait patterns to the changing needs of the terrain and that of rescue. It is composed of three modules responsible for selecting a new gait, evaluating the current gait, and modifying the recommended gait according to the internal reinforcements of past time steps. A Fuzzy Logic Controller is implemented in selecting t...
Equivalent linearization of 2-way fuzzy adaptive system under nonparametric uncertainty and inconsistency
Gurkan, E; Banks, SP; Erkmen, Aydan Müşerref; Erkmen, İsmet (2002-09-18)
Our aim in this paper is to design a 2-way fuzzy adaptive controller for a flexible robot arm and to analyze the stability of this controller using describing function technique. The 2-way fuzzy adaptive system is used in order to model the nonparametric uncertainties and inconsistencies present in the nonlinear system. The use of intuitionistic fuzzy sets in the 2-way fuzzy adaptive structure makes it possible to model such uncertainties. The proposed architecture is used as a controller for a flexible-joi...
Optimal initialization of manipulation dynamics by vorticity model of robot hand preshaping. Part II: Analyses of grasp initialization and its vorticity based optimization
Erkmen, Aydan Müşerref; Tekkaya, E (Wiley, 2000-04-01)
Our work focuses on developing methods of determining the optimal preshape of a robot hand closing onto an object in order to achieve at contact a certain stability and manipulability degree based on kinematic considerations. This purposive closing of a preshaped hand should then be kinematically modelled in such a way that impact force patterns on the object can naturally be deduced from the model and be optimized such that upon contacting the object the desired optimum initial conditions of manipulation a...
Hybrid Force and Motion Control of a Three-Dimensional Flexible Robot Considering Measurement Noises
Kılıçaslan, Sinan; Özgören, Mustafa Kemal; Ider, Sıtkı Kemal (2022-07-01)
This work addresses the end-effector trajectory-tracking force and motion control of a three-dimensional three-link robot considering measurement noises. The last two links of the manipulator are considered as structurally flexible. An absolute coordinate approach is used while obtaining the dynamic equations to avoid complex dynamic equations. In this approach, each link is modeled as if there is no connection between the links. Then, joint connections are expressed as constraint equations. After that, the...
Optimal control of a half-circular compliant legged monopod
AYDIN, Yasemin Ozkan; Saranlı, Afşar; Yazıcıoğlu, Yiğit; Saranlı, Uluç; Leblebicioğlu, Mehmet Kemal (2014-12-01)
This paper investigates an optimal control strategy for the dynamic locomotion of a simplified planar compliant half-circular legged monopod model. We first present a novel planar leg model which incorporates rolling kinematics and a new compliance model, motivated by the use of similar leg designs on existing platforms. Two locomotion tasks, moving at a prescribed horizontal velocity and a one-shot jump to maximum possible height or length, are then investigated within this model. The designs of two high-l...
Citation Formats
M. Erden and M. K. Leblebicioğlu, “Optimal behaviour inspired fuzzy controller design for a three joint robot leg in protraction phase,” 2004, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/42838.