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Theremin is an electronic musical instrument considered to be the most difficult to play which requires the player's hands to have high precision and stability as any position change within proximity of the instrument's antennae can make a difference to the pitch or volume. In a different direction to previous developments of Theremin playing robots, we propose a Humanoid Thereminist System that goes...
Variable impedance actuators provide the ability to robustly alter interaction impedances mechanically, without bandwidth, power, and stability limitations. They can achieve the physical benefits of an elastic transmission and also recover characteristics of traditionally controlled, inelastic motors. We review previously explored benefits of variable impedance actuators for energetic tasks and impact...
In order to exert large force on an environment, it is effective to apply impulsive force. We describe the motions that perform tasks by applying impulsive force as “impact motion.” The objective of an impact motion is to exert large force on an environment, however if the impulsive force is too large, the robot may fall down due to the reaction force. This paper presents an optimization scheme to...
The trajectory is one of major issues for a humanoid robot because not every trajectory can provide a stable robot motion. In this paper, a real human motion is used to generate a robot trajectory. Image processing and transformation are used to extract the trajectory from a human motion to a robot trajectory. The dynamic stability of a robot is considered by using the zero moment point (ZMP) because...
This article presents the mechanical design, hardware architecture and control scheme for critic joints in biped robots. A dynamic simulator was developed in order to quantify torque and currents motor requirements for different gait trajectories. The particular characteristics of biped robots has led to an important design effort in transmission systems, which is deeply discussed before presenting...
This paper firstly presents a method to formulate the dynamics of the mobile humanoid robot which is composed by the mobile platform and the upper body. As tip-over is an important stable issue for the mobile robot, the dynamic stability constraint is carefully studied to keep the robot stable. Stable support for the robot moving on a plane is solved. With the consideration of the stability problem...
There are many commercially available robots that display biomimetic influences. Sony's Aibo and DasaRobot's Genibo are two examples where robot dog designs have drawn from nature. Aldebaran's Nao and Hanson Robotics' Zeno are examples of humanoids robots that have drawn influences from the human body. This paper presents the design of an autonomous 21 degree of freedom (DOF) robot bear, named HyKim...
The paper firstly presents a mobile humanoid robot whose upper human-like body is rigidly mounted on the mobile platform with three wheels: two driving wheels and one caster wheel. The wheeled mobile platform moves on the ground subjected to nonholonomic constraints. Then the static equilibrium of the robot on a plane is discussed and tip-over stability of mobile humanoid robot moving on the slope...
Recently, development of mini-sized humanoid robots with a certain level of intelligence becomes a popular research topic. Because of its small size and light weight, those humanoid robots become more portable and attractive. However, extra difficulties are introduced in hardware selection, mechanical design, motion planning, etc. In this paper, we propose the development of a transformable mini-humanoid...
The angular vestibulo-ocular and opto-kinetic reflexes (aVOR and OKR) combine to provide compensation for head rotations in space to help maintain a steady image on the retina. We previously implemented an artificial angular vestibulo-ocular reflex with a fully articulated binocular control system in a quadruped robot head. In this paper, we describe the implementation of artificial opto-kinetic and...
As a recent trend in humanoid robot research, running motion appears to be a very important issue since faster and faster mobility is required. Being an essential fact, jumping phenomenon seems to be the previous step of succeeding running motion as jumping dynamics play the key role to achieve stable running motion cycles. Therefore, in this paper, authors group sought a method to generate real-time...
One of basic characteristics of regular bipedal walk of humanoid robots is the maintenance of their dynamic balance during the walk, whereby a decisive role is played by the unpowered degrees of freedom arising at the foot-ground contact. Hence, the role of Zero-Moment Point (ZMP) as an indicator of dynamic balance is indispensable. The paper gives a very detailed discussion of some basic theoretical...
In multimodal tele-cooperation as considered in this paper two humans in distant locations jointly perform a task requiring multimodal including haptic feedback. One human operator teleoperates a remotely placed humanoid robot which is collocated with the human cooperator. Time delay in the communication channel as destabilizing factor is one of the multiple challenges associated with such a tele-cooperation...
When a mobile robot performs some special tasks, such as carrying a heavy load, moving on a slope or rough terrain, particularly contacting with the environment, it may become unstable even overturn. First, the paper presents a mobile humanoid robot whose upper human-like body is mounted on the mobile platform supported by three wheels (two driving wheels and one caster wheel) and subjected to nonholonomic...
Since a biped robot tends to tip over easily due to impacts, rough terrain or obstacle object, stable and reliable biped walking is a very important achievement. Well designed foot plays a crucial role in stabilization control for a humanoid robot. In this paper, we present a flexible foot design for our humanoid robot, including a landing impact absorption mechanism and a foot attitude estimation...
This paper proposes an whole body motion planning method for humanoid robots in which dynamics is integrated. The method consists of two stages. A collision-free and statically stable path is planned in the first stage and it is transformed into a dynamically stable trajectory in the second stage. Contributions of the method is summarized as follows. (1) A local method plans a C1 path while avoiding...
This paper addresses the problem of generating dynamic motion for a humanoid between two predefined postures. The humanoid robot starts its motion from a statically stable configuration to another known statically stable configuration when it is necessary to make step; that is, the center of mass (COM) is inside the support polygon at the initial and the goal configurations. A dynamic motion generation...
This paper presents a tele-control system constructed from a multi-fingered robot hand and operator. The angle of the robot hand is controlled by the angle of the operator's finger, and the operator feels the environmental force, as detected by the robot hand, constituting so-called bilateral master/slave control. In the experiments, the operator grasped the object in spite of Round Trip Time (RTT)...
The servo control system is designed with TMS320F2812 DSP chip as its core. It solves the problem of the generating of PWM signals, motor velocity feedback and direction and the feedback of the motor current in the servo control system. The structure and mathematical modeling of a dual-wheel upright self-balancing robot are studied. The real experiments are done. The right and left wheels are driven...
In this paper, we present a recursive method for the optimization of humanoid robot motions. The method is based on an efficient dynamics algorithm, which allows the calculation of the gradient function with respect to the control parameters analytically. The algorithm makes use of the theory of Lie groups and Lie algebra. The main objective of this method is to smooth the pre-calculated humanoid...
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