136 research outputs found
Development and Characteristics of a Highly Biomimetic Robotic Shoulder Through Bionics-Inspired Optimization
This paper critically analyzes conventional and biomimetic robotic arms,
underscoring the trade-offs between size, motion range, and load capacity in
current biomimetic models. By delving into the human shoulder's mechanical
intelligence, particularly the glenohumeral joint's intricate features such as
its unique ball-and-socket structure and self-locking mechanism, we pinpoint
innovations that bolster both stability and mobility while maintaining
compactness. To substantiate these insights, we present a groundbreaking
biomimetic robotic glenohumeral joint that authentically mirrors human
musculoskeletal elements, from ligaments to tendons, integrating the biological
joint's mechanical intelligence. Our exhaustive simulations and tests reveal
enhanced flexibility and load capacity for the robotic joint. The advanced
robotic arm demonstrates notable capabilities, including a significant range of
motions and a 4 kg payload capacity, even exerting over 1.5 Nm torque. This
study not only confirms the human shoulder joint's mechanical innovations but
also introduces a pioneering design for a next-generation biomimetic robotic
arm, setting a new benchmark in robotic technology
Enhancing the Performance of a Biomimetic Robotic Elbow-and-Forearm System Through Bionics-Inspired Optimization
This paper delineates the formulation and verification of an innovative
robotic forearm and elbow design, mirroring the intricate biomechanics of human
skeletal and ligament systems. Conventional robotic models often undervalue the
substantial function of soft tissues, leading to a compromise between
compactness, safety, stability, and range of motion. In contrast, this study
proposes a holistic replication of biological joints, encompassing bones,
cartilage, ligaments, and tendons, culminating in a biomimetic robot. The
research underscores the compact and stable structure of the human forearm,
attributable to a tri-bone framework and diverse soft tissues. The methodology
involves exhaustive examinations of human anatomy, succeeded by a theoretical
exploration of the contribution of soft tissues to the stability of the
prototype. The evaluation results unveil remarkable parallels between the range
of motion of the robotic joints and their human counterparts. The robotic elbow
emulates 98.8% of the biological elbow's range of motion, with high torque
capacities of 11.25 Nm (extension) and 24 Nm (flexion). Similarly, the robotic
forearm achieves 58.6% of the human forearm's rotational range, generating
substantial output torques of 14 Nm (pronation) and 7.8 Nm (supination).
Moreover, the prototype exhibits significant load-bearing abilities, resisting
a 5kg dumbbell load without substantial displacement. It demonstrates a payload
capacity exceeding 4kg and rapid action capabilities, such as lifting a 2kg
dumbbell at a speed of 0.74Hz and striking a ping-pong ball at an end-effector
speed of 3.2 m/s. This research underscores that a detailed anatomical study
can address existing robotic design obstacles, optimize performance and
anthropomorphic resemblance, and reaffirm traditional anatomical principles
Compliant actuators that mimic biological muscle performance with applications in a highly biomimetic robotic arm
This paper endeavours to bridge the existing gap in muscular actuator design
for ligament-skeletal-inspired robots, thereby fostering the evolution of these
robotic systems. We introduce two novel compliant actuators, namely the
Internal Torsion Spring Compliant Actuator (ICA) and the External Spring
Compliant Actuator (ECA), and present a comparative analysis against the
previously conceived Magnet Integrated Soft Actuator (MISA) through
computational and experimental results. These actuators, employing a
motor-tendon system, emulate biological muscle-like forms, enhancing artificial
muscle technology. A robotic arm application inspired by the skeletal ligament
system is presented. Experiments demonstrate satisfactory power in tasks like
lifting dumbbells (peak power: 36W), playing table tennis (end-effector speed:
3.2 m/s), and door opening, without compromising biomimetic aesthetics.
Compared to other linear stiffness serial elastic actuators (SEAs), ECA and ICA
exhibit high power-to-volume (361 x 10^3 W/m) and power-to-mass (111.6 W/kg)
ratios respectively, endorsing the biomimetic design's promise in robotic
development
Exact Synthesis of 3-qubit Quantum Circuits from Non-binary Quantum Gates Using Multiple-Valued Logic and Group Theory
We propose an approach to optimally synthesize quantum circuits from non-permutative quantum gates such as Controlled-Square-Root–of-Not (i.e. Controlled-V). Our approach reduces the synthesis problem to multiple-valued optimization and uses group theory. We devise a novel technique that transforms the quantum logic synthesis problem from a multi-valued constrained optimization problem to a permutable representation. The transformation enables us to utilize group theory to exploit the symmetric properties of the synthesis problem. Assuming a cost of one for each two-qubit gate, we found all reversible circuits with quantum costs of 4, 5, 6, etc, and give another algorithm to realize these reversible circuits with quantum gates. The approach can be used for both binary permutative deterministic circuits and probabilistic circuits such as controlled random number generators and hidden Markov models
Effect of Recession on the Re-entry Capsule Aerodynamic Characteristic
AbstractNumerical simulation and analysis of aerodynamic characteristics of Soyuz ablation shape is carried out in this paper for the adverse influence coming from recession. The result indicates that the shape change caused by the recession will increase absolute value of trim angle of attack and trim lift-drag ratio. The conclusion offers reference for the aerodynamic layout design and improve of the Soyuz re-entry capsule
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