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Central pattern generator (CPG) is used to control the locomotion of vertebrate and invertebrate animals, such as walking, running or swimming. It consists of biological neural networks that can produce coordinated rhythmic signals by using simple input signals. In this paper, a full-body joint trajectory generator is proposed for stable bipedal walking by using an evolutionary optimized CPG. Sensory...
In this paper, we present a framework that applies multiple groups of autonomous snowploughs for efficiently removing the snow from airfields. The proposed approach includes formation stabilization into variable shapes depending on the width of runways. The paper is focused on trajectory planning and control during splitting and coupling of formations for cleaning smaller auxiliary roads surrounding...
In this paper, a mixed controller for solving the trajectory tracking and point stabilization problems of a mobile robot is presented, applying the integration of backstepping technique and neural dynamics. By introducing a virtual target point, the whole motion process is divided into two parts. The first one is employed to realize tracking control and the other one is adopted to implement point...
This article presents a control solution for the guidance of wheeled convoy units in non-linear trajectories. The proposal consists of a Mamdani fuzzy controller to solve the Decentralized Control problem as applied to a set of units following a leader, whilst guaranteeing the so called "string stability " condition of the convoy. Fuzzy control design is described for each of the follower...
This paper describes a control strategy for throwing motion of the springed Pendubot based on the concept of unstable zero dynamics. An underactuated two-link planar robot called the Pendubot is investigated to realize dexterous actions of the superior limb in human throwing motion. A torsion spring is mounted on the passive joint of the Pendubot representing the flexibility of the cubital joint....
The aim of this study is to develop a system for extracting information during postural stability tests, using a new capacitive force sensor conceived and made by us. Based on the capacitive force sensor, we developed a pedometric force plate (PFP) for use in human postural and gait analysis. We present the method of data acquisition, the signal processing and the results obtained. For determining...
In this article the sufficient conditions for the practical and finite-time stability of the linear continuous systems with the time-delay are presented. The new delay-independent stability conditions are derived using Lyapunov-like functions for the finite-time systems. For these functions it is not necessary to have properties of positivity in the whole state space as well as negative derivatives...
In this paper an observer for a polynomial nonlinear (nonautonomous) system constrained to a bounded subset of the state space is considered. The presented approach allows the construction of a locally asymptotically stable observer, which is guaranteed to be stable for any possible state within the limits. It is based on a theorem of Jacobi and Prestel. The problem is rewritten as an optimization...
In this paper, the output feedback control problem for a genetic hypersonic vehicle is considered under the restriction that only the vehicle's velocity and altitude are measurable. High gain observers (HGO) are utilized to provide estimation signals for unmeasurable derivatives of the vehicle's velocity and altitude. A comprehensive stability analysis of the closed loop system under the output feedback...
Using the linear noise approximation, we approach to the problem of evaluation and prediction of behavior of autonomous oscillatory genetic networks fluctuated by intrinsic noise. In this approach, the state covariance of the networks represents all the information concerning the fluctuation by intrinsic noise, and further, when the genetic network is an autonomous oscillatory system, the state covariance...
Crane systems used during offshore installations in harsh sea conditions must satisfy rigorous requirements in terms of safety and efficiency. The vertical vessel motion which is due to ocean waves excites dynamic forces which have an extensive effect on the overall crane structure and its lifetime. Furthermore, the operator gets handicapped during fine positioning of the payload. Thus, compensation...
This paper considers the finite-time controller design for wheeled mobile robots. After the mobile robot dynamics have been transformed into an advantageous form, called the heisenberg form, a finite-time controller is designed in order to promulgate the practical stability of the system. The desired stability property of the closed-loop system is provided by applying a homogeneous sliding mode controller,...
In this paper we formulate and solve optimal control problems for power generating kite systems. Here, the kite generates energy by periodically pulling a generator on the ground while flying fast in a crosswind direction. We are searching for an intrinsically open-loop stable trajectory such that the kite generates as much power as possible without needing feedback, while neither the kite nor the...
Many gun launched projectiles spin to maintain in-flight dynamic stability. This spinning often induces the gyroscopic phenomenon known as precession, or coning. Coning poses a problem for actively controlling the projectile. A control scheme is proposed that can compensate for the coning angle of the projectile and allow front-mounted canards to efficiently change the projectile flight path without...
This paper presents a new combination of algorithms to allow coordinated movement of groups of autonomous systems in formation. A key feature of the work we will present here is a number of specific sets of fuzzy algorithms that, in combination, allow a movement in formation in 3D environments simply based on sensor inputs in a purely reactive manner. This approach is combined with a global optimization...
This study examines effects of learning 3D micromanipulation in an unstable dynamic environment. A test group trained in an unstable divergent force field while a control group trained the movement in the null force field. The subjects in the test group increased the success rate, in contrast to the control group which had similar rate after training. The error and its standard deviation decreased...
In this paper, an Estimator/Observer Swapping system is proposed, for the surface Permanent Magnet Synchronous Motor (PMSM), to overcome position observability problems at zero speed which is an unobservable state point. The designed observer based on Higher Order Sliding Mode (HOSM) is used in order to ensure the robustness against disturbances and to avoid the chattering phenomenon which is inherent...
Since the longitudinal, lateral, and yaw dynamics of front steering vehicles are represented by nonlinear coupled equations, it is not easy to derive the explicit nonlinear controller of both steering angle and driving force for the perfect path-following control. In this paper, a novel and robust sliding mode controller for vehicles with coupled full dynamic model is presented. Comparing with the...
The ship straight-line tracking system is restricted by unintegrable second order nonholonomic constraint, so it is underactuated and difficult to control. The control of the ship straight-line tracking was converted to the control of an actuated system by the output variable redefined method. The stabilization of tracking system, which can be ensured by the stabilization of the new system, was proved...
A waist joint is designed for a humanoid robot in this paper, which has the characteristics of a large range of motion and high mechanical strength. A new method of balance control based on waist joints is also provided. It can effectively increase the stability margin during single support phase. We have been developing BHR, which has 38 DOF (degree of freedom). Each arm of BHR has 11 DOF in total...
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