We describe the design and construction of a quadruped robot which walks on uneven terrain. A control system which produces a statically stable gait has been implemented; results showing a straight and turning gait are presented. The control of quadruped robots poses interesting challenges due to a small stability margin (when compared to hexapods for example). For this reason most implemented ...

In this paper, stability analysis of walking gaits and robustness analysis are developed for a five-link and four-actuator biped robot. Stability conditions are derived by studying unactuated dynamics and using the Poincaré map associated with periodic walking gaits. A stable gait is designed by an optimization process satisfying physical constraints and stability conditions. Also, considering...

This paper includes results of investigations of real six-legged robot. By the name of hexapod we call a robot that walks on six legs. Due to specific construction of legs, each leg has 3 degrees of freedom, prototype constructed by us allows to model gait of reptiles and insects. Presented system of rotation angle of each of the cells (servos) allows to analyze every single type of the movemen...

We investigate the locomotion of a surface-walking/climbing robot, the Planar Walker, based on a novel planar eight-bar closed-loop mechanism. The robot can produce inchworm-like movements in two orthogonal directions and can rotate about itself. The locomotion mechanism to achieve such motions comprises four two-way linear cylinders forming a deformable quadrilateral and four two-way gripper m...

This paper deals with the generation of dynamically balanced gaits of a ditch-crossing biped robot having seven degrees of freedom (DOFs). Three different approaches, namely analytical, neural network (NN)based and fuzzy logic (FL)-based, have been developed to solve the said problem. The former deals with the analytical modeling of the ditch-crossing gait of a biped robot, whereas the latter t...

This paper presents the gait generation and mechanical design of a humanoid robot based on a limit cycle walking method-Virtual Slope Control. This method is inspired by Passive Dynamic Walking. By shortening the swing leg, the robot walking on level ground can be considered as on a virtual slope. Parallel double crank mechanisms and elastic feet are introduced to the 5 DoF robot leg, to make t...

Objectives: To study an algorithm to control a bipedal robot walk so that it has gait close of human. It is known the Twin Delayed Deep Deterministic Policy Gradient (TD3) highly efficient with few changes compared popular — commonly used (DDPG) in continuous action space problem Reinforcement Learning. Methods: Different from usual sparse reward function model used, this study, combined and de...

This paper presents a novel gait generation approach which combines a reactionary and a central pattern generator (CPG) system. The former couples isolated leg controllers by simple gait generation rules that ensure static stability and produce a continuum of gait patterns across the full speed range. The CPG system is based on six coupled oscillators and complements the reactionary system to f...

Over the past few years in Japan, the number of senior citizens has increased remarkably, and around 1,650,000 of them have gait disorders. Gait disorder means to become difficult of gait by many kinds of cause. For examples, cerebrovascular disorders and joint trouble are the main causes of gait disorders, which are common ailments among those aged 65 to 74. They may be unrelated to the workin...

BACKGROUND The ability to objectively analyze gait in a clinical environment is challenging due to time, space and cost constraints. This study investigated the validity of a portable gait assessment tool in objectively assessing the temporal gait parameters in subjects with spinal cord injury. The portable gait assessment tool consisted of a pair of insoles instrumented with force sensing resi...