Articles | Volume 11, issue 2
https://doi.org/10.5194/ms-11-381-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ms-11-381-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
27 Oct 2020
Research article |
| 27 Oct 2020
| 27 Oct 2020
Singularity and branch identification of a 2 degree-of-freedom (DOF) seven-bar spherical parallel manipulator
Liangyi Nie
School of Mechanical Engineering and Electronic Information, China
University of Geosciences, Wuhan, 430074, China
Hubei Key Laboratory of Advanced Control and Intelligent Automation for
Complex Systems, Wuhan, 430074, China
Faculty of Engineering Sciences Institute of Mechatronics and System
Dynamics, University of Duisburg-Essen, 47057 Duisburg, Germany
Huafeng Ding
CORRESPONDING AUTHOR
School of Mechanical Engineering and Electronic Information, China
University of Geosciences, Wuhan, 430074, China
Andrés Kecskeméthy
Faculty of Engineering Sciences Institute of Mechatronics and System
Dynamics, University of Duisburg-Essen, 47057 Duisburg, Germany
Jinqiang Gan
School of Mechanical Engineering and Electronic Information, China
University of Geosciences, Wuhan, 430074, China
Jun Wang
Center for Robotics Research, School of Mechanical Engineering, Hubei
University of Technology, Wuhan, 430068, China
Kwun-lon Ting
Center for Manufacturing Research, Tennessee Technological University, TN
38505, USA
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Florian Simroth, Huafeng Ding, and Andrés Kecskeméthy
Mech. Sci., 7, 107–117, https://doi.org/10.5194/ms-7-107-2016, https://doi.org/10.5194/ms-7-107-2016, 2016
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The "double-banana" problem is a counter-example of Laman's rigidity condition formula for which existing standard Degree of Freedom counting formulas fail. The novelty of the approach for rigidity detection presented in this paper consists in regarding the structure not as a set of joint-connected bodies but as a set of interconnected loops. By tracking isolated DOFs such as those arising between pairs of spherical joints, rigidity/mobility subspaces can be identified successfully.
Related subject area
Subject: Mechanisms and Robotics | Techniques and Approaches: Mathematical Modeling and Analysis
Modeling and control strategy of a haptic interactive robot based on a cable-driven parallel mechanism
Research on obstacle performance and tipping stability of a novel wheel–leg deformation mechanism
Dynamic modeling and vibration characteristics analysis of parallel antenna
A real-time and accurate detection approach for bucket teeth falling off based on improved YOLOX
Research on structural parameters and kinematic properties of a drill-in granary grain condition detector
Surface modification and tooth contact analysis of variable hyperbolic circular-arc-tooth-trace cylindrical gears
Analysis of the coaxiality–geometric hysteresis model of a rotate vector reducer based on Ansys Adams
Dynamic modeling and experiment of hind leg swimming of beaver-like underwater robot
Spring efficiency assessment and efficient use of spring methods of statically balanced planar serial manipulators with revolute joints only
Structural optimization of a pipe-climbing robot based on ANSYS
Design and analysis of a hollow-ring permanent magnet brake for robot joints
A novel compound topological invariant for isomorphism detection of planar kinematic chains
Varying rate adaptive hybrid position–impedance control for robot-assisted ultrasonic examination system
Design and kinematic analysis of a multifold rib modular deployable antenna mechanism
Design of a transrectal ultrasonic guided prostate low dose rate brachytherapy robot
A passive upper-limb exoskeleton for industrial application based on pneumatic artificial muscles
Innovative design method for planar mechanism configuration based on component similarity discrimination
Design and test of a positioning system for a greenhouse electric micro-tiller based on ultra-wideband
A novel flying–walking power line inspection robot and stability analysis hanging on the line under wind loads
Kinematic and dynamic analysis of an omnidirectional mobile platform driven by a spherical wheel
Kinematic and dynamic accuracy of spherical mechanisms
Design and analysis of a six-wheeled companion robot with mechanical obstacle-overcoming adaptivity
Precise mathematical model for the ratchet tooth root bending stress
Swing control for a three-link brachiation robot based on sliding-mode control on irregularly distributed bars
Analysis and compensation control of passive rotation on a 6-DOF electrically driven Stewart platform
Force analysis of minimal self-adaptive fingers using variations of four-bar linkages
Kinematics decoupling analysis of a hyper-redundant manipulator driven by cables
Research on a cascade model synthesis with the use of classical and non-classical methods in the context of new piezoelectric stack applications
A toy-inspired kirigami pattern and its kinematic performance by applying mechanisms and machine theory
Analytical solution to contact characteristics for a variable hyperbolic circular-arc-tooth-trace cylindrical gear
The approximate calculation of the natural frequencies of a Stockbridge type vibration damper and analysis of natural frequencies' sensitivity to the structural parameters
Dynamic modeling and vibration analysis of a cracked 3K-II planetary gear set for fault detection
Kinematics analysis of a four-legged heavy-duty robot with a force–position hybrid control servo actuator in a parallel-executed cylinder system
Semi-numerical analysis of a two-stage series composite planetary transmission considering incremental harmonic balance and multi-scale perturbation methods
An innovative equivalent kinematic model of the human upper limb to improve the trajectory planning of exoskeleton rehabilitation robots
Design and evaluation of a novel upper limb rehabilitation robot with space training based on an end effector
Vibroacoustic characteristics analysis of a planetary gear reducer considering the exterior housing structure
Programming piston displacements for constant flow rate piston pumps with trigonometric transition functions
Center-point steering analysis of tracked omni-vehicles based on skid conditions
Performance analysis of an electro-hydrostatic actuator with high-pressure load sensing based on fuzzy PID
Lagrange-method-based dynamic analysis of multi-stage planetary roller screw mechanism
Design and performance analysis of wave linear generator with parallel mechanism
A novel algorithm by combining nonlinear workspace partition with neural networks for solving the inverse kinematics problem of redundant manipulators
A real-time inverse kinematics solution based on joint perturbation for redundant manipulators
A new method for isomorphism identification of planetary gear trains
Analysis and control of state jump in space deployable structures under alternating temperature loads
Design and analysis of a novel deployable hexagonal prism module for parabolic cylinder antenna
Mechanism analysis of ancient Chinese crossbows
Traditional Chinese Yuekou locks
A new hand rehabilitation system based on the cable-driven mechanism and dielectric elastomer actuator
Da Song, Xinlei Xiao, Gang Li, Lixun Zhang, Feng Xue, and Lailu Li
Mech. Sci., 14, 19–32, https://doi.org/10.5194/ms-14-19-2023, https://doi.org/10.5194/ms-14-19-2023, 2023
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The haptic interactive robot based on a cable-driven parallel mechanism studied in this paper is mainly used for interactive training between an astronaut and a virtual environment. This haptic interactive robot can accurately simulate the motion and mechanical characteristics of objects in a microgravity environment and can safely interact with astronauts.
Minghui Zhang and Yiming Su
Mech. Sci., 14, 1–13, https://doi.org/10.5194/ms-14-1-2023, https://doi.org/10.5194/ms-14-1-2023, 2023
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A new type of wheel–leg deformation mechanism, based on an electromagnetic clutch and gear rack transmission mechanism, is designed for moving on complex terrain. The walking model is established to study the kinematics characteristics and obstacle-surmounting performance of the mechanism. The stability cone method is used to evaluate the rollover stability and anti-interference ability in order to ensure the normal operation of the mechanism.
Guoxing Zhang, Jianliang He, Jinwei Guo, and Xinlu Xia
Mech. Sci., 13, 1019–1029, https://doi.org/10.5194/ms-13-1019-2022, https://doi.org/10.5194/ms-13-1019-2022, 2022
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The closed-form dynamics equation of the 1.8 m aperture parallel antenna is established. The relationship between the mechanism's natural frequency, displacement response, and resonance frequency is obtained. Based on the dynamic model, the closed-loop motion control strategy of the parallel antenna mechanism is established. The tracking error of the pitch and azimuth motion of the parallel antenna in the workspace is within ±0.05°.
Jinnan Lu and Yang Liu
Mech. Sci., 13, 979–990, https://doi.org/10.5194/ms-13-979-2022, https://doi.org/10.5194/ms-13-979-2022, 2022
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Aiming at the potential safety problems caused by the looseness of bucket teeth of the electric shovel, we propose an improved YOLOX algorithm. After introducing the dilated CBAM, the deep separable convolution, and model compression, the mAP is decreased by 0.33 %, the detection speed is increased by 11.9 fps, and the model volume is reduced to 29.46 % of the YOLOX model. It provides a theoretical basis and technical support for the development of intelligent mines and mining intelligence.
Qiang Yin, Junpeng Yu, Shaoyun Song, Yonglin Zhang, Gang Zhao, Zhiqiang Hao, and Ao Hu
Mech. Sci., 13, 961–978, https://doi.org/10.5194/ms-13-961-2022, https://doi.org/10.5194/ms-13-961-2022, 2022
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In order to store grain in large warehouses, a process is required that will prevent the effects of mildew and heat. Real-time monitoring of the grain status is needed. Using the information obtained from the monitoring system, corresponding measures were taken for the heating and mildew points in the grain pile. We proposed a drill which is a granary grain condition detector. It can be equipped with temperature, CO2, and humidity sensors and gather information by entering the grain pile.
Yongping Liu and Dengqiu Ma
Mech. Sci., 13, 909–920, https://doi.org/10.5194/ms-13-909-2022, https://doi.org/10.5194/ms-13-909-2022, 2022
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Firstly, the tooth surface modification method based on the parabolic forming blade and cutter inclination was proposed. Next, the modified tooth surface equation was deduced and the 3D reconstruction of the modified tooth surface is realized. Then, the influence of modification parameters on tooth surface curvature characteristics was analysed. Finally, the tooth contact analysis model was established to discuss the influence of modification parameters on the elliptical contact area.
Yongming Liu, Lei Fu, Zhuanzhe Zhao, Qiang Ma, Yujian Rui, and Zhen Zhang
Mech. Sci., 13, 855–866, https://doi.org/10.5194/ms-13-855-2022, https://doi.org/10.5194/ms-13-855-2022, 2022
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The coaxiality–geometric hysteresis model of the RV reducer transmission system is established, and the model is simulated and analyzed with Adams software. The results show that coaxiality is one of the main error factors affecting hysteresis. This research can provide a theoretical basis and reference materials for the measurement and design of RV reducer hysteresis, as well as the design of the RV reducer performance high-precision detection device and its adjustment mechanism.
Gang Chen, Zhenyu Wang, Jiajun Tu, and Donghai Wang
Mech. Sci., 13, 831–842, https://doi.org/10.5194/ms-13-831-2022, https://doi.org/10.5194/ms-13-831-2022, 2022
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In the research and development process of underwater motion control of the beaver-like robot, the hind leg and tail are the main actuators. In order to estimate the driving force of the robot autonomously during underwater movement, we propose this model, which can quickly and easily infer the force of the hind leg on the body. The correctness of this model is verified by experiments and simulations.
Chia-Wei Juang, Chi-Shiun Jhuang, and Dar-Zen Chen
Mech. Sci., 13, 817–830, https://doi.org/10.5194/ms-13-817-2022, https://doi.org/10.5194/ms-13-817-2022, 2022
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This paper proposes a spring efficiency assessment and the efficient use of springs methods for a static spring-balanced manipulator. Gravity is balanced by springs; however, it also contains counter-effects between springs. Conceptually, with fewer counter-effects between springs, there is less burden on the spring system, which means that the springs are used more efficiently. Through adjustment of the springs' attachment and parameters, a method to use springs efficiently is developed.
Yi Zheng, Minghua Liu, Baoshun Li, Guoqing Ma, and Maohua Xiao
Mech. Sci., 13, 725–733, https://doi.org/10.5194/ms-13-725-2022, https://doi.org/10.5194/ms-13-725-2022, 2022
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In order to improve the structural performance of the out-of-pipe pipe-climbing robot, the out-of-pipe pipe-climbing robot is optimized. The structure and size of the robot was optimized. Static and modal analyses were then performed on key robot components and ANSYS was used for topology optimization. It was found the weight of the optimized frame and clamping arm were respectively reduced by 24 % and 20 %, and the maximum stress was respectively reduced by 46 % and 20 %.
Ruoyu Tan, Jieji Zheng, Bin Yu, Baoyu Li, Dapeng Fan, and Xin Xie
Mech. Sci., 13, 687–699, https://doi.org/10.5194/ms-13-687-2022, https://doi.org/10.5194/ms-13-687-2022, 2022
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A novel hollow-ring permanent magnet brake integrated in robot joints is proposed, which allows the brake to require much less axial space and provides more than 1.5 times braking torque for the same volume as the conventional electromagnetic-spring friction brake. A coupled dynamics model of the proposed brake is developed from machine-electric-magnetic aspects. The 3D model of the brake is simulated through finite-element software. The theoretical models are verified through experiments.
Yingxian Wang, Rongjiang Cui, and Jinxi Chen
Mech. Sci., 13, 585–591, https://doi.org/10.5194/ms-13-585-2022, https://doi.org/10.5194/ms-13-585-2022, 2022
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This paper use the topological characteristic constants for isomorphism identification, such as the power value sequence (PVS), least distance matrix sequence (LDMS), and loop number (LN). The fourth PVS, the LDMS, and the LN are compared and arranged in descending order, forming a strong complementary chain. Our results show that solving the problem of the isomorphism identification of the kinematic chain (KC) based on graph theory definition has no advantage in efficiency.
Zhanxin Xie and Zheng Yan
Mech. Sci., 13, 559–575, https://doi.org/10.5194/ms-13-559-2022, https://doi.org/10.5194/ms-13-559-2022, 2022
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Robotic ultrasonic scanning needs to apply an appropriate force for a long time during the acquisition process. Excessive contact force may lead to deformation and even hurt the patient, while insufficient force would lead to poor image quality. We proposed a varying rate hybrid position–impedance control strategy, which can partly play the role of an ultrasound sonographer and serve as a medical assistant to reduce their workload.
Dake Tian, Haiming Gao, Lu Jin, Rongqiang Liu, Yu Zhang, Chuang Shi, and Jiewei Xu
Mech. Sci., 13, 519–533, https://doi.org/10.5194/ms-13-519-2022, https://doi.org/10.5194/ms-13-519-2022, 2022
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Space deployable antenna is a new type of space structure, and one of the key payloads of spacecraft, which is widely used in mobile communication, navigation and remote sensing, deep space exploration, military reconnaissance, and other fields of science and technology and national defense. Aiming at the urgent need for the development of space deployable antenna with large aperture and a high storage rate, a new configuration of a multifold rib modular deployable antenna mechanism is proposed.
Xuesong Dai, Yongde Zhang, Jingang Jiang, Bing Li, and Sihao Zuo
Mech. Sci., 13, 399–409, https://doi.org/10.5194/ms-13-399-2022, https://doi.org/10.5194/ms-13-399-2022, 2022
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Transrectal prostate brachytherapy (BT) can effectively treat prostate cancer. During the operation, doctors need to hold the ultrasound probe for repeated adjustments, which makes it difficult to ensure the efficiency, accuracy, and safety of the operation. We designed an 11 DOF (degrees of freedom) active and passive transrectal BT robot based on the analysis of the transrectal prostate BT process.
Maria Paterna, Stefania Magnetti Gisolo, Carlo De Benedictis, Giovanni Gerardo Muscolo, and Carlo Ferraresi
Mech. Sci., 13, 387–398, https://doi.org/10.5194/ms-13-387-2022, https://doi.org/10.5194/ms-13-387-2022, 2022
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We present a novel exoskeleton based on deformable pneumatic actuators, known as McKibben muscles or artificial muscles. The aim of this system is to support a worker during overhead tasks, in which they need to lift the arms and hold that position for a long time. Simulations have been performed, starting from a mathematical model of the exoskeleton and of the artificial muscle. A first architecture of the complete device is also presented.
Weiwei Hong, Jinxi Chen, Bingliang Ye, and Rongjiang Cui
Mech. Sci., 13, 353–359, https://doi.org/10.5194/ms-13-353-2022, https://doi.org/10.5194/ms-13-353-2022, 2022
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To obtain all mechanical schemes, scholars in this field have proposed an innovative design method using kinematic chain configuration synthesis. However, the existing innovative design method easily produces redundant design schemes. We analyze the similar component discrimination method for mechanisms from the perspective of graph theory and apply it to the specialization of topological graphs to solve the problem of redundant design schemes.
Ying Lin, Qian Chen, Haijun Zhang, Ye Ma, Wenlian Zeng, Guojun Wei, Hongxiang Wang, and Maohua Xiao
Mech. Sci., 13, 225–237, https://doi.org/10.5194/ms-13-225-2022, https://doi.org/10.5194/ms-13-225-2022, 2022
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A positioning system for ultra-wideband (UWB) electric micro-tillers suitable for complex greenhouse environments was designed as the basis for realising unmanned micro-tillers to address the problem of frequent safety accidents of existing micro-tillers. The positioning system of the greenhouse electric micro-tiller designed in this paper demonstrates a stable performance and positioning accuracy to meet the needs of greenhouse rotary tillage operations.
Xinyan Qin, Bo Jia, Jin Lei, Jie Zhang, Huidong Li, Bo Li, and Zhaojun Li
Mech. Sci., 13, 257–273, https://doi.org/10.5194/ms-13-257-2022, https://doi.org/10.5194/ms-13-257-2022, 2022
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Power line inspection not only wastes human and material resources, but also has a high-risk factor for manual inspection of power lines. Therefore, based on previous researchers, we designed a novel power line inspection robot. We also investigate walking stability of the robot on the line when encountering working conditions with crossing wind, since the power line is about 50–60 m from the ground and the inspection robots are greatly affected by wind.
Luis Daniel Filomeno Amador and Eduardo Castillo Castañeda
Mech. Sci., 13, 31–39, https://doi.org/10.5194/ms-13-31-2022, https://doi.org/10.5194/ms-13-31-2022, 2022
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In mobile robot development, the designer focuses on the novelty of the final element, leaving out the mobile platform evolution; the chief problem with wheeled mobile robots is the restricted movement in the workspace due to the necessity for the system's reorientation. Our goal is to realize a wheeled mobile robotic system that can generate an omnidirectional displacement without the need to redirect the wheels, thus guaranteeing continuous operation.
Dinh Tung Vo, Sergey Kheylo, and Van Quoc Nguyen
Mech. Sci., 13, 23–30, https://doi.org/10.5194/ms-13-23-2022, https://doi.org/10.5194/ms-13-23-2022, 2022
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The proposed approach to assessing the kinematic accuracy allows one to determine the deviations in the output link using the theory of accuracy. This allows one to determine the deviations in the output link at any point in the working area and propose constructive solutions for its compensation. This approach to determining the positioning error makes it possible to calculate the deviations in the output link for similar mechanisms of a parallel structure.
Zhen Song, Zirong Luo, Guowu Wei, and Jianzhong Shang
Mech. Sci., 12, 1115–1136, https://doi.org/10.5194/ms-12-1115-2021, https://doi.org/10.5194/ms-12-1115-2021, 2021
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It is more efficient and safe to use a sub robot to replace the mother robot to perform space exploration tasks full of challenges. A novel three-rocker-arm six-wheeled robot with adaptive obstacle-crossing capability was designed to form a sub-parent exploration system with a large robot and to perform exploration tasks. A prototype of the robot is developed, and the experiment results show that the robot can maintain stability in rugged terrain and has excellent ability to cross obstacles.
Chao Liu, Ning Ding, Jingsong Duan, Lili Zhou, Shanfu Cui, Shuna Jiang, and Aofei Li
Mech. Sci., 12, 1105–1113, https://doi.org/10.5194/ms-12-1105-2021, https://doi.org/10.5194/ms-12-1105-2021, 2021
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In this paper, we use the folded section hypothesis to determinate the ratchet tooth root bending stress and provide a normal mathematical model to calculate it. This model has been proved by the finite element analysis method and the ratchet experiment. It is recommended that this model be used to predict the ratchet tooth root bending stress in the ratchet design process.
Zhiguo Lu, Guoshuai Liu, Haibin Zhao, Ruchao Wang, and Chong Liu
Mech. Sci., 12, 1073–1081, https://doi.org/10.5194/ms-12-1073-2021, https://doi.org/10.5194/ms-12-1073-2021, 2021
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This paper designs a type of bionic-gibbon robot with three links and two grippers. We apply the sliding-mode control to the swing motion of the robot. The bionic-gibbon robot can complete continuous brachiation motion on the irregularly distributed bars. Besides, compared with the two-link structure, the three-link structure introduced in this paper improves the swing efficiency and increases the swing height of the robot.
Qitao Huang, Peng Wang, Bowen Li, and Qingjun Yang
Mech. Sci., 12, 1027–1036, https://doi.org/10.5194/ms-12-1027-2021, https://doi.org/10.5194/ms-12-1027-2021, 2021
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The electrically driven Stewart platform (EDSP) is used widely. However, the passive rotation (PR) on driven branch chains can generate posture error on the end effector. Compensation control strategy is designed to avoid effects of PR on posture accuracy of the 6-DOF (degrees of freedom) EDSP based on calculation and analysis. The validity of analysis and the effectiveness of the compensation method used to improving posture accuracy are proven by simulation and experiments on a 6-DOF EDSP.
Fadi Nassar and Lionel Birglen
Mech. Sci., 12, 1037–1049, https://doi.org/10.5194/ms-12-1037-2021, https://doi.org/10.5194/ms-12-1037-2021, 2021
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This paper presents the force analysis and optimization of four versions of self-adaptive robotic fingers based on the simplest closed-loop 1 degree-of-freedom mechanism possible, namely the four-bar linkage. Two of these versions include prismatic joints. It was concluded that simpler designs in adaptive fingers do not necessarily mean weaker performances since the results are at least comparable with other designs with more degrees of freedom.
Lei Zhang, Guangyao Ouyang, and Zhaocai Du
Mech. Sci., 12, 1017–1026, https://doi.org/10.5194/ms-12-1017-2021, https://doi.org/10.5194/ms-12-1017-2021, 2021
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To solve the kinematics mapping problem for the joint space and the drive space of a hyper-redundant manipulator based on flexible cable actuation, which is the key for hyper-redundant manipulators to move strictly according to trajectory planning and avoid obstacles, a decoupling method for kinematics analyses of the flexible cable actuation space and the joint rotation space was proposed.
Jacek Harazin and Andrzej Wróbel
Mech. Sci., 12, 959–969, https://doi.org/10.5194/ms-12-959-2021, https://doi.org/10.5194/ms-12-959-2021, 2021
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This article contains new propositions for modelling piezoelectric stack models by using existing classical and non-classical methods with the aim of improving piezoelectric stack capabilities. Polynomial chain fractioning is used to obtain a mechanical model with a cascade structure. To verify model output frequencies and amplitudes, edge graphs and structural numbers are used. With the help of Kelvin–Voigt, Mason and Maxwell slip models, an electromechanical model solutions are proposed.
Weiwei Lin, Kunjing Chen, Yuan Gao, Aihua Chen, Fufu Yang, and Huijuan Feng
Mech. Sci., 12, 933–943, https://doi.org/10.5194/ms-12-933-2021, https://doi.org/10.5194/ms-12-933-2021, 2021
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The problem of inverse folding, determining the distribution of creases according to the desired shape, requires luck and artist inspiration, and it is a very complicated process. Here, we try to solve an inverse folding problem about a folding toy and get some kirigami patterns. It opens up a new way to solve the problem and can also help students understand the theory of mechanisms and machines.
Rui Guo, Yongqiao Wei, Yongping Liu, Dawei Li, Dong Yang, and Gang Zhao
Mech. Sci., 12, 923–932, https://doi.org/10.5194/ms-12-923-2021, https://doi.org/10.5194/ms-12-923-2021, 2021
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The variable hyperbolic circular-arc-tooth-trace (VH-CATT) cylindrical gear is a new type of gear. In order to research the contact characteristics of the VH-CATT cylindrical gear, tooth surface mathematical models of this kind of gear pair are derived based on the forming principle of the rotating double-edged cutting method with great cutter head in this regard.
Qing Yin, Jianli Zhao, Yong Liu, and Yisheng Zhang
Mech. Sci., 12, 863–873, https://doi.org/10.5194/ms-12-863-2021, https://doi.org/10.5194/ms-12-863-2021, 2021
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The approximate calculation of a Stockbridge type damper's natural frequencies and its sensitivity were studied. The low-order frequency is highly sensitive to the cable's length, moderately sensitive to the damper's mass, and slightly sensitive to the eccentric distance and the damper's gyration radius. The high-order frequency is highly sensitive to the cable's length and the damper's gyration radius, moderately sensitive to the damper's mass, and slightly sensitive to the eccentric distance.
Meng Sang, Kang Huang, Yangshou Xiong, Guangzhi Han, and Zhenbang Cheng
Mech. Sci., 12, 847–861, https://doi.org/10.5194/ms-12-847-2021, https://doi.org/10.5194/ms-12-847-2021, 2021
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Few pieces of literature could be found on vibration investigations of the 3K planetary gear set, a basic planetary drive structure with a more compact structure and wider transmission ratio range than the 2K-H. In this paper, the features of casing vibration and output torsional vibration are analyzed by establishing a dynamics model of a 3K-II gearbox. The advantages and disadvantages of these two vibration signals as a basis for 3K planetary gear system fault diagnosis are also compared.
Guiying Wang, Xigui Wang, Yongmei Wang, and Baixue Fu
Mech. Sci., 12, 735–749, https://doi.org/10.5194/ms-12-735-2021, https://doi.org/10.5194/ms-12-735-2021, 2021
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An electrohydraulic servo four-legged heavy-duty (FLHD) robot has been designed and developed. An integration layout cylinder design scheme for a non-lightweight hydraulic servo four-legged robot with high loads and torque of the hip joint is proposed, and the mathematical element analysis model for a parallel-executed cylinder (PEC) system is derived. A design idea of a force–position hybrid control scheme is determined for the PEC.
Xigui Wang, Siyuan An, Yongmei Wang, Jiafu Ruan, and Baixue Fu
Mech. Sci., 12, 701–714, https://doi.org/10.5194/ms-12-701-2021, https://doi.org/10.5194/ms-12-701-2021, 2021
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A comparison between the results obtained by the MsP method and the numerical integration method proves that the former is ideal and credible in most regions. The effects of the time-varying parameters and the nonlinear deenthing caused by the gear teeth clearance on the amplitude–frequency characteristics of TsSCS components are studied. This is a part of research on transmission gears' thermal deformation for application in warship power rear drive systems.
Qiaolian Xie, Qiaoling Meng, Qingxin Zeng, Hongliu Yu, and Zhijia Shen
Mech. Sci., 12, 661–675, https://doi.org/10.5194/ms-12-661-2021, https://doi.org/10.5194/ms-12-661-2021, 2021
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This paper proposes a new 13 degrees of freedom equivalent kinematic model for the human upper limb and fully considers the movement characteristics of human upper limbs in anatomy. The proposed model can be utilized to analyze the human upper limb workspace and joint motions. Furthermore, the model can effectively evaluate the existing upper limb exoskeleton and provide suggestions for structural improvements in line with human motion.
Qiaoling Meng, Zongqi Jiao, Hongliu Yu, and Weisheng Zhang
Mech. Sci., 12, 639–648, https://doi.org/10.5194/ms-12-639-2021, https://doi.org/10.5194/ms-12-639-2021, 2021
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This paper proposes a novel, 4 degrees of freedom, end-effector-based upper limb rehabilitation robot with space training. The robot can assist the human upper limb in performing rehabilitation training of the shoulder flexion/extension and adduction/abduction and elbow flexion/extension. Different from the desktop-type end-effector-based robot, the proposed robot can provide a wide range of shoulder flexion/extension training and cover the range of movement of the human upper limb.
Lihong Jin, Junpeng Shao, Xigui Wang, Yongmei Wang, and Baixue Fu
Mech. Sci., 12, 539–557, https://doi.org/10.5194/ms-12-539-2021, https://doi.org/10.5194/ms-12-539-2021, 2021
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This study performs an analytical study of the modal and natural frequencies and the vibration types of each order of the gearbox housing structure of a planetary gear reducer (PGR). An optimal housing structure for a PGR with lower acoustic vibrations is designed, and a composite housing structure with damping vibration attenuation and acoustic absorption is proposed. The radiation acoustic characteristics without acoustic protection and damping materials are analyzed.
Zhongxu Tian and Xingxing Lin
Mech. Sci., 12, 559–571, https://doi.org/10.5194/ms-12-559-2021, https://doi.org/10.5194/ms-12-559-2021, 2021
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An analytical method for programming piston displacements for constant flow rate piston pumps is presented. The results show that, with the given transition functions, cam profiles can be designed analytically with parameterized forms, and the maximum accelerations of the pistons are determined by the width of the transition domain and the rotational velocities of the cams, which will affect contact forces between cams and followers.
Yuan Fang, Yunan Zhang, Yinghui Shang, Tao Huang, and Mengfei Yan
Mech. Sci., 12, 511–527, https://doi.org/10.5194/ms-12-511-2021, https://doi.org/10.5194/ms-12-511-2021, 2021
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The center-point steering theory of a traditional tracked vehicle cannot be directly applied to a tracked omni-robot. In this study, for the three typical layout types, rectangular, hybrid, and centripetal, the steady center-point steering motion of a tracked omni-vehicle under skid conditions is analyzed and a correction model is investigated. The correction model can correct the angular velocity and time of the vehicle, as well as give the relationship between the design parameters.
Hong Zhang, Lan Ding, Wentao Zhang, and Chenchen Li
Mech. Sci., 12, 529–537, https://doi.org/10.5194/ms-12-529-2021, https://doi.org/10.5194/ms-12-529-2021, 2021
Xin Li, Geng Liu, Xiaojun Fu, and Shangjun Ma
Mech. Sci., 12, 471–478, https://doi.org/10.5194/ms-12-471-2021, https://doi.org/10.5194/ms-12-471-2021, 2021
Tao Yao, Yulong Wang, Zhihua Wang, and Can Qin
Mech. Sci., 12, 405–417, https://doi.org/10.5194/ms-12-405-2021, https://doi.org/10.5194/ms-12-405-2021, 2021
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A wave energy converter has been investigated, which can convert the absorbed wave energy into electrical energy. Through electromagnetic numerical simulations, the influences of linear generator parameters such as magnetization mode, air gap, and yoke shape on electromagnetic performance were evaluated. Numerical results show axial magnetization and Halbach magnet array can increase magnetic flux intensity more than the radial mode. The conversion rate of wave energy is derived.
Hui Dong, Chen Li, Wentao Wu, Ligang Yao, and Hao Sun
Mech. Sci., 12, 259–267, https://doi.org/10.5194/ms-12-259-2021, https://doi.org/10.5194/ms-12-259-2021, 2021
Qinhuan Xu and Qiang Zhan
Mech. Sci., 12, 221–235, https://doi.org/10.5194/ms-12-221-2021, https://doi.org/10.5194/ms-12-221-2021, 2021
Wei Sun, Ronghe Li, Jianyi Kong, and Anming Li
Mech. Sci., 12, 193–202, https://doi.org/10.5194/ms-12-193-2021, https://doi.org/10.5194/ms-12-193-2021, 2021
Congcong Chen, Tuanjie Li, Yaqiong Tang, and Zuowei Wang
Mech. Sci., 12, 59–67, https://doi.org/10.5194/ms-12-59-2021, https://doi.org/10.5194/ms-12-59-2021, 2021
Xiaofei Ma, Yang Li, Tuanjie Li, Hangjia Dong, Dawei Wang, and Juntao Zhu
Mech. Sci., 12, 9–18, https://doi.org/10.5194/ms-12-9-2021, https://doi.org/10.5194/ms-12-9-2021, 2021
Jie Dong, Kan Shi, Yang Zhang, Tenigeer, and Yan'An Yao
Mech. Sci., 11, 437–445, https://doi.org/10.5194/ms-11-437-2020, https://doi.org/10.5194/ms-11-437-2020, 2020
Yang Zhang and Kuo-Hung Hsiao
Mech. Sci., 11, 411–423, https://doi.org/10.5194/ms-11-411-2020, https://doi.org/10.5194/ms-11-411-2020, 2020
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Yuekou locks are the favorites of antique collectors and have six main types including combination locks, regular locks, pull-back locks, maze locks, multi-stage locks, and hidden-keyhole locks. The crafting of Yuekou locks is conducted in four stages: material preparation, molding, shaping, and assembling. This work introduces the historical development of Yuekou locks, summarizes the verbatim interviews, explores the production of Yuekou locks, and analyzes the structures of Yuekou locks.
Heba Amin, Samy F. M. Assal, and Hiroyasu Iwata
Mech. Sci., 11, 357–369, https://doi.org/10.5194/ms-11-357-2020, https://doi.org/10.5194/ms-11-357-2020, 2020
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The increasing number of patients with hand disabilities after strokes or peripheral nerve injuries necessitates the continuous development of rehabilitation system devices to accelerate muscle recovery and to help patients regain the motor functions of their hands. This paper introduces the design of a hand rehabilitation system for patients who have a solitary impairment of their hand extension. The system was designed to be portable, simple, and cheap.
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Short summary
The main contribution of this paper is to present a kind of 2 DOF seven-bar SPM containing two five-bar spherical loops, which has the advantages of high reaction speed, accuracy rating, and rigidity. And based on the unusual actuated choices and symmetrical loop structure, an approach is provided to identify singularities and branches of this kind of 2 DOF seven-bar SPM. The proposed method is visual and offers geometric insights into understanding the formation of mobility using branch graphs.
The main contribution of this paper is to present a kind of 2 DOF seven-bar SPM containing two...
