72 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
Validation of a low-cost Electromyography (EMG) system via a commercial and accurate EMG device : pilot study
Electromyography (EMG) devices are well-suited for measuring the behaviour of muscles during an exercise or a task, and are widely used in many different research areas. Their disadvantage is that commercial systems are expensive. We designed a low-cost EMG system with enough accuracy and reliability to be used in a wide range of possible ways. The present article focuses on the validation of the low-cost system we designed, which is compared with a commercially available, accurate device. The evaluation was done by means of a set of experiments, in which volunteers performed isometric and dynamic exercises while EMG signals from the rectus femoris muscle were registered by both the proposed low-cost system and a commercial system simultaneously. Analysis and assessment of three indicators to estimate the similarity between both signals were developed. These indicated a very good result, with spearman’s correlation averaging above 0.60, the energy ratio close to the 80% and the linear correlation coefficient approximating 100%. The agreement between both systems (custom and commercial) is excellent, although there are also some limitations, such as the delay of the signal (1 s) and noise due to the hardware and assembly in the proposed system
Sarrus-inspired deployable polyhedral mechanisms
Deployable polyhedral mechanisms (DPMs) have witnessed flourishing growth in recent years because of their potential applications in robotics, space exploration, structure engineering, and so forth. This paper firstly presents the construction, mobility and kinematics of a family of Sarrus-inspired deployable polyhedral mechanisms. By carrying out expansion operation and implanting Sarrus linkages along the straight-line motion paths, deployable tetrahedral, cubic and dodecahedral mechanisms are identified and constructed following tetrahedral, octahedral, and icosahedral symmetry, respectively. Three paired transformations with synchronized radial motion between Platonic and Archimedean polyhedrons are revealed, and their significant symmetric properties are perfectly remained in each work configuration. Subsequently, with assistant of equivalent prismatic joints, the equivalent analysis strategy for mobility of multiloop polyhedral mechanisms is proposed to significantly simplify the calculation process. This paper hence presents the construction method and equivalent analysis of the Sarrus-inspired DPMs that are not only valuable in theoretical investigation, but also have great potential in practical applications such as mechanical metamaterials, deployable architectures and space exploration
Low-Cost Multisensor Integrated System for Online Walking Gait Detection
From Hindawi via Jisc Publications RouterHistory: publication-year 2021, received 2021-04-21, rev-recd 2021-07-02, accepted 2021-07-25, pub-print 2021-08-14, archival-date 2021-08-14Publication status: PublishedA three-dimensional motion capture system is a useful tool for analysing gait patterns during walking or exercising, and it is frequently applied in biomechanical studies. However, most of them are expensive. This study designs a low-cost gait detection system with high accuracy and reliability that is an alternative method/equipment in the gait detection field to the most widely used commercial system, the virtual user concept (Vicon) system. The proposed system integrates mass-produced low-cost sensors/chips in a compact size to collect kinematic data. Furthermore, an x86 mini personal computer (PC) running at 100 Hz classifies motion data in real-time. To guarantee gait detection accuracy, the embedded gait detection algorithm adopts a multilayer perceptron (MLP) model and a rule-based calibration filter to classify kinematic data into five distinct gait events: heel-strike, foot-flat, heel-off, toe-off, and initial-swing. To evaluate performance, volunteers are requested to walk on the treadmill at a regular walking speed of 4.2 km/h while kinematic data are recorded by a low-cost system and a Vicon system simultaneously. The gait detection accuracy and relative time error are estimated by comparing the classified gait events in the study with the Vicon system as a reference. The results show that the proposed system obtains a high accuracy of 99.66% with a smaller time error (32 ms), demonstrating that it performs similarly to the Vicon system in the gait detection field
Hamiltonian-path based constraint reduction for deployable polyhedral mechanisms
Most of the deployable polyhedral mechanisms (DPMs) are multi-loop overconstrained mechanisms that causes barriers for their applications due to the issues in assembly, operation and control. Yet, constraint reduction for these multi-loop overconstrained mechanisms is extremely challenging in kinematics. In this paper, by introducing the Hamiltonian path to investigate the 3D topological graphs of a group of Sarrus-inspired DPMs, we propose a systematic method for constraint reduction of multi-loop overconstrained DPMs. We demonstrate that through the removal of redundant joints with the assistant of tetrahedral Hamiltonian path, one equivalent simplest topological graph of tetrahedral mechanism is identified as a reduction basic unit. Subsequently, one simplest form of Sarrus-inspired cubic mechanism is obtained by investigating two Hamiltonian paths of its dual octahedron and sequentially arranging basic units. Furthermore, a total of nineteen simplest forms of Sarrus-inspired dodecahedral mechanisms are identified from seventeen Hamiltonian paths of its dual icosahedron. The overconstraints in each simplest Sarrus-inspired DPM are greatly reduced while preserving the original one-degree-of-freedom (DOF) motion behavior. The method proposed in this paper not only lays the groundwork for further research in wider deployable polyhedrons, but also inspires the reduction of other multi-loop overconstrained mechanisms, with potential applications in the fields of manufacturing, architecture and space exploration
Design, Dimensional Synthesis and Evaluation of a Novel 2-DOF Spherical RCM Mechanism for Minimally Invasive Surgery
With the development of minimally invasive surgery (MIS) technology, higher requirements are put forward for the performance of remote center of motion (RCM) manipulator. This paper presents the conceptual design of a novel two degrees of freedom (2-DOF) spherical RCM mechanism, whose axes of all revote joints share the same RCM. Compared with the existing design, the proposed mechanism indicates a compact design and high structure stability, and the same scissor-like linkage makes it easy to realize modular design. It also has the advantages of singularity free and motion decoupling in its workspace, which simplifies the implementation and control of the manipulator. In addition, compared with the traditional spherical scissor linkage mechanism, the proposed mechanism adds a rotation constraint on the output shaft to provide better operating performance. In this paper, the kinematics and singularities of different cases are deduced and compared, and the kinematic model of the best case is established. According to the workspace and constraints in MIS, the optimal structural parameters of the mechanism are determined by dimensional synthesis with the goal of optimal global operation performance. Furthermore, a prototype is assembled to verify the performance of the proposed mechanism. The experimental results show that the 2-DOF prototype can provide a reliable RCM point. The compact design makes the manipulator have potential application prospects in MIS
Enhancing Gearbox Fault Diagnosis through Advanced Feature Engineering and Data Segmentation Techniques
Efficient gearbox fault diagnosis is crucial for the cost-effective maintenance and reliable operation of rotating machinery. Despite extensive research, effective fault diagnosis remains challenging due to the multitude of features available for classification. Traditional feature selection methods often fail to achieve optimal performance in fault classification tasks. This study introduces diverse ranking methods for selecting the relevant features and utilizes data segmentation techniques such as sliding, windowing, and bootstrapping to strengthen predictive model performance and scalability. A comparative analysis of these methods was conducted to identify the potential causes and future solutions. An evaluation of the impact of enhanced feature engineering and data segmentation on predictive maintenance in gearboxes revealed promising outcomes, with decision trees, SVM, and KNN models outperforming others. Additionally, within a fully connected network, windowing emerged as a more robust and efficient segmentation method compared to bootstrapping. Further research is necessary to assess the performance of these techniques across diverse datasets and applications, offering comprehensive insights for future studies in fault diagnosis and predictive maintenance
X-crossing pneumatic artificial muscles
Artificial muscles are promising in soft exoskeletons, locomotion robots, and operation machines. However, their performance in contraction ratio, output force, and dynamic response is often imbalanced and limited by materials, structures, or actuation principles. We present lightweight, high–contraction ratio, high–output force, and positive pressure–driven X-crossing pneumatic artificial muscles (X-PAMs). Unlike PAMs, our X-PAMs harness the X-crossing mechanism to directly convert linear motion along the actuator axis, achieving an unprecedented 92.9% contraction ratio and an output force of 207.9 Newtons per kilogram per kilopascal with excellent dynamic properties, such as strain rate (1603.0% per second), specific power (5.7 kilowatts per kilogram), and work density (842.9 kilojoules per meter cubed). These properties can overcome the slow actuation of conventional PAMs, providing robotic elbow, jumping robot, and lightweight gripper with fast, powerful performance. The robust design of X-PAMs withstands extreme environments, including high-temperature, underwater, and long-duration actuation, while being scalable to parallel, asymmetric, and ring-shaped configurations for potential applications
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