Articles | Volume 10, issue 1
https://doi.org/10.5194/ms-10-255-2019
© Author(s) 2019. 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-10-255-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
18 Jun 2019
Research article |
| 18 Jun 2019
| 18 Jun 2019
Mechanism design and parameter optimization of a new asymmetric translational parallel manipulator
Yi Yang
School of Mechatronic Engineering and Automation, Shanghai University, Shanghai, 200444, China
Yaqi Tang
School of Mechatronic Engineering and Automation, Shanghai University, Shanghai, 200444, China
Haijun Chen
School of Mechatronic Engineering and Automation, Shanghai University, Shanghai, 200444, China
Yan Peng
CORRESPONDING AUTHOR
School of Mechatronic Engineering and Automation, Shanghai University, Shanghai, 200444, China
Huayan Pu
School of Mechatronic Engineering and Automation, Shanghai University, Shanghai, 200444, China
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Subject: Mechanisms and Robotics | Techniques and Approaches: Numerical Modeling and Analysis
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The relationship between installation error and contact performance was studied. The tooth surface equation and contact ellipse were deduced, and the imprinting experiment was realized. The tooth contact analysis (TCA) model was developed to investigate the influence of the installation error on the contact area. The formulas of the gap and flexibility matrix were given to develop the loaded TCA (LTCA) model. The influence of the installation error on load distribution was investigated.
Yushuai Fan, Xun Li, Xin Liu, Shuo Cheng, and Xiaohua Wang
Mech. Sci., 15, 195–207, https://doi.org/10.5194/ms-15-195-2024, https://doi.org/10.5194/ms-15-195-2024, 2024
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In this study, we systematically improved the multi-robot formation control algorithm. We employed a virtual spring approach to stabilize formations, enhanced the Velocity Obstacle algorithm to address collisions in dynamic mobility, and introduced a leader for consistency. Simulations with up to 20 robots confirmed our method's suitability for large-scale formation obstacle avoidance. Position error and path length remained stable as robot numbers increased.
Haitong Liang, Hailing Fu, and Guangbo Hao
Mech. Sci., 15, 159–168, https://doi.org/10.5194/ms-15-159-2024, https://doi.org/10.5194/ms-15-159-2024, 2024
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A miniaturized statically balanced compliant mechanism is proposed as a structural solution to effectively lower the working frequencies of vibrational energy harvesters to ultralow levels across a wide bandwidth for practical applications. This mechanism exhibits zero stiffness and zero force within a specific displacement range and stiffness nonlinearity in the overall range. It overcomes the working frequency limit imposed by the size effect, showing great potential application value.
Yufei Liu, Lang Wu, En Lu, and Jinyong Ju
Mech. Sci., 15, 123–136, https://doi.org/10.5194/ms-15-123-2024, https://doi.org/10.5194/ms-15-123-2024, 2024
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This paper investigates the vibration coupling effect and grinding force control of an elastic component grinding system, which is a multi-dimensional coupling system conveying a dynamic interaction between the elastic component and the grinding device during the grinding process. The research results have guiding significance for the vibration control and constant force control of robotic grinding systems for elastic components.
Haijun Xu, Liyang Xu, Yikun Feng, Xiaojun Xu, Yue Jiang, and Xue Gao
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A high-speed wheeled amphibious vehicle was designed and researched based on computational fluid dynamic (CFD) technology. The results were compared with the corresponding test results for verification. CFD is applied to analyze the influence of the wheel flip angle on the resistance performance, and resistance reduction is explained by the change in wake flow-field of the amphibious vehicle. The wheel well was optimized based on our requirement for the vehicle performance on land and water.
Rui Liu, Yishan Zeng, Min Hu, Huabing Zhu, Changhai Liu, and Lei Wang
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Jian Qi, Yuan Gao, and Fufu Yang
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Fufeng Xue and Zhimin Fan
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To date, most underwater manipulators have been rigid-link structures with a small number of degrees of freedom and have been unable to perform well in confined spaces. Due to their high dexterity and good adaptability to different environments, snake-like manipulators have strong potential for use in complex underwater applications. In this study, a tip-following algorithm is presented to weave through confined and hazardous spaces along a defined path with high efficiency.
Yucheng Tang, Xiaolong Yang, Xiaojin Zhu, Shichao Zhou, Wenbin Zha, Yuxin Sun, and Yulin Wang
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This paper presents a novel united propulsive mechanism inspired by the frog’s hindlimb. This hybrid mechanism is composed of a planar six-bar linkage, which is designed using homotopy continuation and a spatial four-bar mechanism. The two sub-chains connected on the foot form a closed loop, which decreases the degrees of freedom (DoF) of the foot to 2. The preliminary simulations validate the amphibious function of the designed mechanism.
Xinran Wang, Wen Li, Dongxu Hu, Xingjian Dai, and Haisheng Chen
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This paper investigates the influence of friction effects on a gear-rotor system in compressed air energy storage (CAES), a new mathematical model of the system is established, and some new vibration characteristics of the gear-rotor system are shown in this paper. The results obtained in this paper will provide a reference for the study and design of a gear-rotor system in CAES.
Wenjie Wang, Qing Tao, Xiaohua Wang, Yuting Cao, and Congcong Chen
Mech. Sci., 12, 649–660, https://doi.org/10.5194/ms-12-649-2021, https://doi.org/10.5194/ms-12-649-2021, 2021
Juan Ignacio Valderrama-Rodríguez, José M. Rico, and J. Jesús Cervantes-Sánchez
Mech. Sci., 11, 91–99, https://doi.org/10.5194/ms-11-91-2020, https://doi.org/10.5194/ms-11-91-2020, 2020
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The paper presents a general procedure to determine the instantaneous rotation center for planar mechanisms, or its kinematical equivalent in the case of spherical or spatial cases, from the velocity analysis of the mechanism. The procedure is based on the theoretical results of the Lie algebra, se(3), of the Euclidean group, together with the Killing and Klein forms. The paper shows that a previous contribution contains fundamental errors and it was done in order to unify the theory.
Chongfei Huai and Yaping Zhao
Mech. Sci., 10, 199–211, https://doi.org/10.5194/ms-10-199-2019, https://doi.org/10.5194/ms-10-199-2019, 2019
Gaspar Rodríguez Jiménez, David Rodríguez Salgado, Francisco Javier Alonso, and José María del Castillo
Mech. Sci., 9, 359–371, https://doi.org/10.5194/ms-9-359-2018, https://doi.org/10.5194/ms-9-359-2018, 2018
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The present work describes the design and build of a new completely mechanical propulsion system for manual wheelchairs for use in ascending or descending long ramps. The design is characterized by a self-locking mechanism that activates automatically to brake the chair when the user stops pushing. The main component of the propulsion system is a planetary gear train that can self-lock, this means that the user does not need to activate external brakes.
Zharilkassin Iskakov, Kuatbay Bissembayev, and Nutpulla Jamalov
Mech. Sci., 9, 307–325, https://doi.org/10.5194/ms-9-307-2018, https://doi.org/10.5194/ms-9-307-2018, 2018
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• With a large load on the vibrating table, the oscillation of the motor shaft angular velocity and the effect of friction on it are more significant.
• Simulink model of the mechanism was developed for numerical calculations.
• Friction increases the difference between the maximum and minimum values of the angular velocity and the coefficient of non-uniformity of rotation.
• Sliding friction influences the frequency, the maximum and minimum values of the work-table kinematic parameters.
Chan-Jung Kim
Mech. Sci., 9, 259–266, https://doi.org/10.5194/ms-9-259-2018, https://doi.org/10.5194/ms-9-259-2018, 2018
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The conceptual design of balance shaft was very important process as how to locate the unbalance masses and corresponding supporting bearings. In this paper, the optimal conceptual balance shaft model was derived by using proposed objective functions for an inline 3-cylinder engine and an inline 4-cylinder one, respectively. Two kinds of optimal model were derived from simulations and efficient design guidelines was finally explained with design flowchart.
Wenjie Wang, Lingtao Yu, and Jing Yang
Mech. Sci., 8, 323–335, https://doi.org/10.5194/ms-8-323-2017, https://doi.org/10.5194/ms-8-323-2017, 2017
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Force sensing plays an important role in minimally invasive surgery. In this study, a new asymmetric cable-driven type of micromanipulator for a surgical robot was designed, and a joint angle estimator(JAE) was designed based on the dynamical model system. Closed-loop control of the joint angle was carried out by regarding the JAE output as the feedback signal. An external force estimator was designed using a disturbance observer. The experimental results shown the correctness and validity.
Santhakumar Mohan and Burkhard Corves
Mech. Sci., 8, 235–248, https://doi.org/10.5194/ms-8-235-2017, https://doi.org/10.5194/ms-8-235-2017, 2017
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This paper presents the complete dynamic model of a new six degrees of freedom (DOF) spatial 3-RPRS parallel manipulator. Further, a robust task-space trajectory tracking control is also designed for the manipulator along with a nonlinear disturbance observer. To demonstrate the efficacy and show the complete performance of the proposed controller, virtual prototype experiments are executed using one of multibody dynamics software namely MSC Adams.
Bingxiao Ding, Yangmin Li, Xiao Xiao, Yirui Tang, and Bin Li
Mech. Sci., 8, 117–126, https://doi.org/10.5194/ms-8-117-2017, https://doi.org/10.5194/ms-8-117-2017, 2017
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A flexure-based monolithic micro manipulation stage with large workspace is designed and analyzed. The piezoelectric actuators are adopted to drive the manipulation stage. The optimized lever amplifier is integrated into the mechanism in order to compensate the stroke of the piezoelectric actuators. The working range of the manipulation stage along each axis is ± 42.31 μm, ± 48.56 μm, 0–10.28 m rad, respectively.
Guoyong Yang, Hongguang Wang, Jizhong Xiao, Zuowei Wang, and Lie Ling
Mech. Sci., 8, 51–63, https://doi.org/10.5194/ms-8-51-2017, https://doi.org/10.5194/ms-8-51-2017, 2017
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This paper presents a gravity unloading facility to simulate micro-gravity environment of space. The facility unloads the gravity of artificial antenna of satellite and its pointing mechanism to test the performance of the pointing mechanism on the ground. The facility consists of two layers to unload gravity hierarchically and simultaneously while the antenna pointing mechanism consists of two joints. The calculation, simulation and experiments all show the effectiveness of the method applied.
R. Benoit, N. Delanoue, S. Lagrange, and P. Wenger
Mech. Sci., 7, 31–38, https://doi.org/10.5194/ms-7-31-2016, https://doi.org/10.5194/ms-7-31-2016, 2016
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We propose two Interval Analysis based methods to characterize novel robots. Interval analysis theory allows us to consider intervals instead of values, making it possible to use computer algorithms, without the drawback of rounding errors. The first proposed method can isolate chosen interest points and is applied to the characteristic cusp and node points of 3R orthogonal manipulators. The second method encloses the robot available postures, giving complementary information on the novel robot.
G. Hao and J. Mullins
Mech. Sci., 6, 75–80, https://doi.org/10.5194/ms-6-75-2015, https://doi.org/10.5194/ms-6-75-2015, 2015
N. Khan, I. Ullah, and M. Al-Grafi
Mech. Sci., 6, 29–34, https://doi.org/10.5194/ms-6-29-2015, https://doi.org/10.5194/ms-6-29-2015, 2015
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The problem of dimensional synthesis of mechanisms to trace a given closed curve is solved by (a) representation of curve shape using normalized Fourier descriptors and (b) learning the relation between Fourier descriptors and mechanism dimensions by an artificial neural network (ANN). The ANN developed suggests dimensions of a four-bar mechanism with coupler curve of shape similar to the one desired. The dimensions are further refined by optimization.
G. Palmieri
Mech. Sci., 6, 9–14, https://doi.org/10.5194/ms-6-9-2015, https://doi.org/10.5194/ms-6-9-2015, 2015
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This paper deals with an elasto-static analysis of a 2-DOF spherical parallel
wrist where the links and the joints are considered flexible. An FEM approach is used to analyze the problem in a series of configurations of the wrist. The results are elaborated in order to obtain continuous maps of the positioning and orientation errors over the workspace of the machine.
Q. Meng, Y. Li, and J. Xu
Mech. Sci., 4, 345–356, https://doi.org/10.5194/ms-4-345-2013, https://doi.org/10.5194/ms-4-345-2013, 2013
H. Mazhar, T. Heyn, A. Pazouki, D. Melanz, A. Seidl, A. Bartholomew, A. Tasora, and D. Negrut
Mech. Sci., 4, 49–64, https://doi.org/10.5194/ms-4-49-2013, https://doi.org/10.5194/ms-4-49-2013, 2013
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Short summary
With the requirement of heavy load for pick-and-place operation, a new 3-DoF asymmetric translational parallel manipulator is invented in this paper. This manipulator is assembled by a kinematic limb with the parallel linear motion elements(PLMEs), and a single loop 2-UPR. Owning to the linear actuators directly connecting the moving and the fixed platforms, this parallel manipulator has high force transmission efficiency, and adapts to pick-and-place operation under heavy load.
With the requirement of heavy load for pick-and-place operation, a new 3-DoF asymmetric...
