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In this paper, we improve a running speed of a biped robot by using a control law of a new wobbling mass. In the model of the biped robot, the running speed decreases when using a conventional control law of the wobbling mass. We first describe the conventional running control law of the biped robot and propose a control law that moves the wobbling mass up and down so that the forward direction component...
In this paper, we design a novel knee exoskeleton. The designed exoskeleton has a 1 DOF with knee joint actuated in the sagittal plane. The exoskeleton is actuated base on Series Elastic Actuator (SEA) instead of traditonal stiff actuator. SEA is a compliant actuator, having the advantages of low output impedance, low friction, high quality force control and backdrivability. Thanks to these nice characteristics,...
Over the last decade, active lower-limb prostheses demonstrated their ability to restore a normal gait for transfemoral amputees by supplying the required positive energy balance [1]. However, the added-value of such devices is significantly impacted by their limited energetic autonomy preventing their full appropriation by the patients. There is thus a strong incentive to reduce the overall power...
In this paper, we report the model of an original actuation concept for a transfemoral prosthesis, relying on the combination of a single power motor, a compliant element (a spring), a mechanical differential, and two infinitely variable transmissions. It allows to manage the mechanical power flows through the device in both directions (i.e. when energy should be produced or dissipated by the knee...
This paper presents design of a novel modular lower-limb gait exoskeleton built within the FP7 BioMot project. Exoskeleton employs a variable stiffness actuator in all 6 joints, a directional-flexibility structure and a novel physical humanrobot interfacing, which allows it to deliver the required output while minimally constraining user's gait by providing passive degrees of freedom. Due to modularity,...
This case study compares a transfemoral amputee's gait while using the existing Ossur Total Knee 2000 and our novel 3D printed anatomically scalable transfemoral prosthetic knee. The anatomically scalable transfemoral prosthetic knee is 3D printed out of a carbon-fiber and nylon composite that has a gear-mesh coupling with a hard-stop weight-actuated locking mechanism aided by a cross-linked four-bar...
Compliance is an important feature of human locomotion, where many studies have focused on the identification of stiffness parameters in order to build new machines, and stiffness is often assumed to be constant. However, it has been shown that during human walking, stiffness profiles are not constant in time and have high modulations in particular when changing walking phases. In order to understand...
Most airdropped cargo use a combination of one or more parachutes and an impact attenuation system to land safely. The latter adds cost, weight and complexity. However, by using their legs for impact attenuation, airdropped quadruped robots may avoid the need for such a system. In this paper, various leg configurations for attenuating impact of airborne landings were studied and tested. Using simple...
The lower limb exoskeleton can help the paralyzed walk again, also can be used to reduce the body weight. it is necessary to promote the anthropomorphic and man-machine matching of exoskeleton. The man-machine matching is divided into two, one is the structure matching and the other is the driven matching involving the biomechanics of the muscle. This article puts forward the design rule of exoskeleton...
The planar and energetically conservative Spring-Loaded Inverted Pendulum (SLIP) model with a linear spring has been modified in recent years to include an articulated knee, friction and contact losses, and energy thrusts during stance to stabilize forward velocity and hopping height. The work presented here advances the SLIP template toward a biological anchor by adding a third parallel articulating...
This paper introduces a novel and light weight lower extremity exoskeleton, used for carrying heavy load in the individual soldier combat system. This exoskeleton has six degree of freedom per leg, only one of which is powered by the motor. In order to provide a reference for the exoskeleton mechanical structure and drive unit, the mechanical topology is designed and analyzed by Adams software to...
This paper introduces a wearable robotic orthosis with spring-assist actuators, which is designed to assist people who have difficulty in walking. The spring-assist actuator consists of an electrical motor and a spring, which are attached to a rotational axis in parallel to each other. The spring-assist actuator is developed based on the analysis on the stiffness of the knee and hip joints during...
Individuals with unilateral stroke have neuromuscular weakness or paralysis on one side of the body caused by some muscles disengaging and others overexciting. Hyperextension of the knee joint and complete lack of plantar flexion of the ankle joint are common symptoms of stroke. This paper focuses on the creation and implementation of a small, lightweight, and adjustable orthotic device to be positioned...
SLIP model with compliance describes human locomotion very well. A Legged robot's variable stiffness joint could produce an equivalent virtual spring leg, which is the foundation for SLIP model's physical implementation. This paper presents a single leg with knee joint actuated by hydraulic SEA and proposes a variable stiffness control method that is applied to the virtual spring leg. The experiment...
In this paper, we present a small-sized quadruped robot by using compliant mechanisms to accomplish walking, turning, and jumping motions. The design of cable-driven legs with a tension spring on the knee joint can provide robust, stable, and energy efficient gaits for quadruped robots. The quadruped robot can produce a trot-like walking motion, based on the proposed foot trajectory, and the turning...
In human hopping in place, the axial leg function is representable by a spring mass model. This description can be utilized to control robot hopping. In this paper, the SLIP (spring loaded inverted pendulum) model is employed as a template for the control of MARCO Hopper II, a robot with a two-segmented leg. Using VMC (virtual model control) a spring is emulated between the foot and hip joint. The...
Exoskeleton robots are wearable electromechanical structures interacting with human limbs. They are used for extending or replacing human performance in power augmentation and rehabilitation applications. The neuro-muscular system of the human body provides flexible and stable movement with minimum energy consumption by means of the compliant actuation of human joints. Similar to human body, compliant...
In the field of rehabilitation following a stroke (Cerebral Apoplexy), having the patient walking as soon as possible is critical to recovery. Current practices rely heavily on the manual assistance of nursing staff to achieve this. To assist during this phase a low cost light weight single strut knee-ankle-foot orthosis (KAFO) has been developed. However the orthosis requires walking with the dysfunctional...
In this paper, we present the method used to design a humanoid robot called Johnny by optimizing the energy consumption of walking. The mechanical model is inspired on passive dynamic walkers. We used a basic genetic algorithm to find, at the same time, the optimal mechanical parameters, as well as the optimal walking trajectories and the optimal gains, for the feedback control used in the current...
Within the limbs of typical animals, there exist bi-articular muscles crossing two joints. It is known that the bi-articular muscles of the felid play an important role in the locomotion. Also the muscle-tendon complex, composed of the gastrocnemius muscle and the Achilles' tendon that cross the knee joint and the ankle joint contributes much to the movements such as running and jumping particularly...
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