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Journal articles on the topic 'Optimization of Spherical Mechanism'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Essomba, T., L. Nguyen Vu, and C. T. Wu. "Optimization of a Spherical Decoupled Mechanism for Neuro-Endoscopy Based on Experimental Kinematic Data." Journal of Mechanics 36, no. 1 (2019): 133–47. http://dx.doi.org/10.1017/jmech.2019.33.

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ABSTRACTThe neuro-endoscopy is a surgical technique that allows the neurosurgeon to maintain a visual contact while operating inside the brain of a patient. A special instrument called the neuro-endoscope is inserted in the brain until the neurosurgeon reaches his/her target. Its manipulation requires a high level of training for neurosurgeons. To enforce both quality and safety of neuro-endoscopy, we propose a robotic manipulator based on a Spherical Decoupled Mechanism. This mechanical architecture has been modified from a 5-Bar Spherical Linkages and adapted to this medical application. It

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Reinholtz, Charles F., George N. Sandor, and Joseph Duffy. "Branching Analysis of Spherical RRRR and Spatial RCCC Mechanisms." Journal of Mechanisms, Transmissions, and Automation in Design 108, no. 4 (1986): 481–86. http://dx.doi.org/10.1115/1.3258759.

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Most mechanisms can be assembled in two or more distinct configurations for a given position of the input link. Each distinct configuration is called a branch. When the prescribed positions of a synthesized mechanism lie on more than one branch, the mechanism is said to have branching problems or to suffer from “branch defect.” Usually, branching problems will render a mechanism unsuitable for the design task because the mechanism must be moved to the other branch during the course of motion. In most cases, this would require disassembly and reassembly of the mechanism. In this paper, conditio

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3

Niu, Guo-jun, Bo Pan, Fu-hai Zhang, Hai-bo Feng, and Yi-li Fu. "Multi-optimization of a spherical mechanism for minimally invasive surgery." Journal of Central South University 24, no. 6 (2017): 1406–17. http://dx.doi.org/10.1007/s11771-017-3545-2.

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Essomba, T., M. A. Laribi, S. Zeghloul, and G. Poisson. "Optimal synthesis of a spherical parallel mechanism for medical application." Robotica 34, no. 3 (2014): 671–86. http://dx.doi.org/10.1017/s0263574714001805.

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SUMMARYThis paper introduces the design and the optimization of a probe holder robot for tele-echography applications. To define its kinematic architecture, an approach based on motion capture of an expert's gestures during ultrasound examinations was proposed. The medical gestures analyzed consisted of ultrasound probe movements and were used to characterize the kinematic specifications of the proposed manipulator. The selected architecture was a Spherical Parallel Mechanism (SPM) with 3 degrees of freedom (DoF) and its optimal synthesis was performed using real-coded Genetic Algorithms (GA).

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Lo, Ho Shing, and Shengquan Xie. "Optimization and analysis of a redundant 4R spherical wrist mechanism for a shoulder exoskeleton." Robotica 32, no. 8 (2014): 1191–211. http://dx.doi.org/10.1017/s0263574714001945.

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SUMMARYThis paper presents a redundant 4-revolute (4R) spherical wrist mechanism for a shoulder exoskeleton, which overcomes several major issues with the 3R mechanisms used in the past. An analysis of the 3R mechanism is done to highlight the limitations in its range of motion and problems caused by operating near singular configurations. To ensure that the redundancy in the 4R mechanism is efficiently utilized, genetic algorithm is used to optimize the mechanism design and identify the optimal operating configurations of the mechanism. The capability to reach the entire shoulder workspace is

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Ouerfelli, M., and V. Kumar. "Optimization of a Spherical Five-Bar Parallel Drive Linkage." Journal of Mechanical Design 116, no. 1 (1994): 166–73. http://dx.doi.org/10.1115/1.2919341.

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The spherical five bar parallel drive linkage is investigated for use as a spherical manipulator or as a pointing mechanism. The direct and inverse kinematics are derived for a general 5-R linkage. Kinematic and dynamic optimization yields a geometry in which all link lengths are equal to a right angle.

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Tao, Zongjie, and Qi An. "Interference analysis and workspace optimization of 3-RRR spherical parallel mechanism." Mechanism and Machine Theory 69 (November 2013): 62–72. http://dx.doi.org/10.1016/j.mechmachtheory.2013.05.004.

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8

Xie, Shaorong, Shuping Li, Junjie Huang, Hengyu Li, and Jun Luo. "Structural Parameter Optimization for 3-DOF Spherical Parallel Mechanism, Binocular Stereo." Information Technology Journal 11, no. 7 (2012): 859–67. http://dx.doi.org/10.3923/itj.2012.859.867.

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9

Park, Jahng Hyon, Jeseok Kim, and Jin Han Jeong. "Kinematics Optimization of a 3-SPS Parallel Redundant Motion Mechanism Using Conformal Geometric Algebra." Applied Mechanics and Materials 789-790 (September 2015): 889–95. http://dx.doi.org/10.4028/www.scientific.net/amm.789-790.889.

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In this paper, an actuation mechanism for high-speed aiming of a target is proposed. The mechanism is a 3DOF-SPS (spherical-prismatic-spherical) parallel manipulator and can be used for a missile defense system with a fast reaction time. This type of parallel mechanism has high rigidity against external disturbances and accordingly high stiffness and precision. The target aiming requires 2 degrees of freedom and this 3 DOF mechanism has one redundancy. For fast manipulation of the proposed mechanism, the redundancy can be exploited and an optimal solution can be found out of the infinite numbe

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10

Kurtz, R., and V. Hayward. "Multiple-goal kinematic optimization of a parallel spherical mechanism with actuator redundancy." IEEE Transactions on Robotics and Automation 8, no. 5 (1992): 644–51. http://dx.doi.org/10.1109/70.163788.

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11

Nelson, C. A., M. A. Laribi, and S. Zeghloul. "Multi-robot system optimization based on redundant serial spherical mechanism for robotic minimally invasive surgery." Robotica 37, no. 7 (2018): 1202–13. http://dx.doi.org/10.1017/s0263574718000681.

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SUMMARYSerial spherical linkages have been used in the design of a number of robots for minimally invasive surgery, in order to mechanically constrain the surgical instrument with respect to the incision. However, the typical serial spherical mechanism suffers from conflicting design objectives, resulting in an unsuitable compromise between avoiding collision with the patient and producing good kinematic and workspace characteristics. In this paper, we propose a multi-robot system composed of two redundant serial spherical linkages to achieve this purpose. A multi-objective optimization for ac

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Yi, Teng Da, Bing Li, and Nan Wang. "Analysis and Optimization of a Vibration Isolation Platform Based on 6-DOF Parallel Mechanism." Key Engineering Materials 625 (August 2014): 748–53. http://dx.doi.org/10.4028/www.scientific.net/kem.625.748.

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In this paper a 6-DOF(Degree of Freedom) vibration isolation platform with structural configuration of 3CPS (3 Cylindrical-Prismatic-Spherical)-1UPS (1 Universal-Prismatic-Spherical) parallel mechanism is proposed. Firstly, the dynamic model is developed through virtual work principle. The transfer function and the complex frequency response function were obtained from the dynamical equation. Then, 36 amplitude frequency diagrams are obtained from the frequency response function. By analyzing the 36 amplitude frequency diagrams, 10 vibration coupling terms were chosen. The range of the spring

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LI Yan-biao, 李研彪, 王. 林. WANG Lin, 罗怡沁 LUO Yi-qin, 孙. 鹏. SUN Peng, and 郑. 航. ZHENG Hang. "Dynamic modeling and dynamic load distribution optimization of a spherical 5R parallel mechanism." Optics and Precision Engineering 26, no. 8 (2018): 2012–20. http://dx.doi.org/10.3788/ope.20182608.2012.

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14

Pan, Yongjun, and Liang Hou. "Lifting and parallel lifting optimization by using sensitivity and fuzzy set for an earthmoving mechanism." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 231, no. 2 (2016): 192–203. http://dx.doi.org/10.1177/0954407016660454.

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Earthmoving equipment in motor graders, which can be considered to be complex multibody systems (MBSs), are critical components for earthwork, compaction and re-handling. They have not yet received much attention due to their unusual applications and complicated structures. In this paper, a comprehensive study of an earthmoving MBS, from the mechanism identification and sensitivity analysis to the multi-objective optimization, is presented. First, the earthmoving MBS is identified to be a six degrees-of-freedom spatial hybrid mechanism, where a three revolute-revolute-prismatic-spherical (RRPS

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15

Luo, Jun, Qi Ming Guo, Heng Yu Li, Chao Jiong Huang, and Shao Rong Xie. "Kinematic and Modal Simulation Analysis of the Bionic Eye Based on Spherical Parallel Mechanism (SPM)." Applied Mechanics and Materials 128-129 (October 2011): 1151–56. http://dx.doi.org/10.4028/www.scientific.net/amm.128-129.1151.

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In order to realize stable tracking under bumpy environment, the robot bionic eye constructed by spherical parallel mechanism with 3 DOF is designed based on the characteristics of human being’s eyes. ANSYS and ADAMS are utilized to conduct modal and kinematics property analysis respectively. According to the result of ANSYS modal analysis, the structure highly meets the demands of function and reliability, which lays the foundation for optimization and bump-resistance design. Through ADAMS kinematics analysis, displacement, velocity and acceleration curves of mechanism end effector were obtai

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16

Lee, Chung-Ching, and Hong-Sen Yan. "Movable Spatial 6R Mechanisms With Three Adjacent Parallel Axes." Journal of Mechanical Design 115, no. 3 (1993): 522–29. http://dx.doi.org/10.1115/1.2919221.

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Based on derived matrix loop equations and their algebraic manipulations, we obtain the necessary mobility criteria, and prove that there are only three types of movable spatial 6R mechanisms with three adjacent parallel axes. The first type is a general form of Sarrus 6R mechanism. The second type can be regarded as a combination of spherical and planar 4R mechanisms. The third type is a hybrid linkage, first mentioned by Waldron. All these three types are proper linkages confirmed by iteration and optimization methods.

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17

Enferadi, Javad, and Reza Nikrooz. "The Performance Indices Optimization of a Symmetrical Fully Spherical Parallel Mechanism for Dimensional Synthesis." Journal of Intelligent & Robotic Systems 90, no. 3-4 (2017): 305–21. http://dx.doi.org/10.1007/s10846-017-0675-6.

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18

Parlaktaş, Volkan, Engin Tanık, and Çağıl Merve Tanık. "On the design of a novel fully compliant spherical four-bar mechanism." Advances in Mechanical Engineering 11, no. 9 (2019): 168781401987954. http://dx.doi.org/10.1177/1687814019879548.

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In this article, a novel fully compliant spherical four-bar mechanism is introduced and its generalized design methodology is proposed. The original fully compliant mechanism lies on a plane at the free position (undeflected position); therefore, it has the advantages of ease of manufacturing, minimized parts, and no backlash. First, the mobility conditions of the mechanism are obtained. The dimensions of the mechanism are optimally calculated for maximum output rotation, while keeping the deflection of flexural hinges at an acceptable range. Using an optimization method, design tables are pre

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19

Menon, C., R. Vertechy, M. C. Markot, and V. Parenti-Castelli. "Geometrical Optimization of Parallel Mechanisms Based on Natural Frequency Evaluation: Application to a Spherical Mechanism for Future Space Applications." IEEE Transactions on Robotics 25, no. 1 (2009): 12–24. http://dx.doi.org/10.1109/tro.2008.2008744.

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20

HOU, Yulei. "Optimization and Bionic Design of 3-PCSS/S Spherical Parallel Mechanism for the Shoulder Joint." Journal of Mechanical Engineering 51, no. 11 (2015): 16. http://dx.doi.org/10.3901/jme.2015.11.016.

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21

Lum, M. J. H., J. Rosen, M. N. Sinanan, and B. Hannaford. "Optimization of a Spherical Mechanism for a Minimally Invasive Surgical Robot: Theoretical and Experimental Approaches." IEEE Transactions on Biomedical Engineering 53, no. 7 (2006): 1440–45. http://dx.doi.org/10.1109/tbme.2006.875716.

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22

Cui, Bing Yan, and Zhen Lin Jin. "Parameter Optimization Design of a Novel Robot Shoulder Based on the Workspace." Advanced Materials Research 749 (August 2013): 561–65. http://dx.doi.org/10.4028/www.scientific.net/amr.749.561.

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A robot shoulder joint should have good kinematic performance and workspace, but the structural parameters of shoulder joint directly affect the workspace. In order to increase the workspace of shoulder joint, a novel robot shoulder joint based on 3-DOF orthogonal spherical parallel mechanism is proposed. This paper studied the influence on its workspace affected by the variation of structural parameters of the connecting rod, frame connecting rod, rod diameter of this shoulder joint mechanism. Based on the consideration of mechanical constraint, the objective function of the optimal structura

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23

Yao, Rui, Wen Bai Zhu, and Qing Ge Yang. "Dimension Optimization Design of the Stewart Platform in FAST." Advanced Materials Research 308-310 (August 2011): 2110–13. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.2110.

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China is now building the largest single dish radio telescope in the world in Guizhou province, which is called Five-hundred meter Aperture Spherical radio Telescope (FAST). A Stewart platform is introduced in FAST as an accuracy adjustable mechanism for feed receivers. The main purpose of this paper is to discuss dimension optimization design method of the Stewart platform based on three optimization objective functions. The optimization objective functions can reflect the operability and accuracy of the Stewart platform, and optimization design flow is presented according to the important de

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24

Tang, Yan Hua. "Design and Analysis of a Novel Heavy-Load Positioner with Series-Parallel Mechanism." Applied Mechanics and Materials 635-637 (September 2014): 145–49. http://dx.doi.org/10.4028/www.scientific.net/amm.635-637.145.

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A heavy-load positioner with series-parallel mechanism was put forward according to the heavy-load positioner’s task demand. Two rotational DOFs were realized by the spherical 3-DOF mechanism with a restricted embranchment instead of traditional gear-driven mechanism, the other by the serial part. The mechanism has the advantages of large workspace, good flexibility and high stiffness-to-weight ratio. The kinematics, statics and singularity of the positioner mechanism were analyzed. The mathematic model of the positioner mechanism was established. Combining the workspace demand of the position

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Carretero, J. A., R. P. Podhorodeski, M. A. Nahon, and C. M. Gosselin. "Kinematic Analysis and Optimization of a New Three Degree-of-Freedom Spatial Parallel Manipulator." Journal of Mechanical Design 122, no. 1 (1999): 17–24. http://dx.doi.org/10.1115/1.533542.

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A study of the kinematic characteristics of a three degree-of-freedom (dof) parallel mechanism is presented. The architecture of the mechanism is comprised of a mobile platform attached to a base through three identical prismatic-revolute-spherical jointed serial linkages. The prismatic joints are considered to be actuated. These prismatic actuators lie on a common plane and have radial directions of action. The mechanism’s inverse displacement solution is obtained. Since the mechanism has only 3 dof, constraint equations describing the inter-relationship between the six motion coordinates are

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Lee, T. W., and E. Akbil. "Kinematic Synthesis of Spherical Two-Gear Drives With Prescribed Entire-Motion Characteristics: Unlimited Crank Rotations and Optimum Transmission. Part 1: Theory." Journal of Mechanisms, Transmissions, and Automation in Design 108, no. 1 (1986): 46–52. http://dx.doi.org/10.1115/1.3260783.

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This investigation is concerned with the determination of the rotatability of the input and output cranks and the optimization of transmission characteristics of spherical two-gear drives. Algebraic solutions are shown to be feasible only in a few special cases. In general, numerical synthesis procedures, involving either optimization or parameter scanning processes, are essential and they are developed from the general theory presented in this paper. The results, including conditions that can be regarded as an extension of the Grashof’s rule to the class of spherical geared mechanisms, are us

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Shi, Ke Ke, Shuai Wang, Wan Jun Dou, Yan Yan Meng, Cui Li Chen, and Bin Kun Ni. "Optimization Design and Processing Experiment Research on Grinding Allowance for Large-Scale Spherical Roller Bearing Rings." Key Engineering Materials 881 (April 2021): 45–50. http://dx.doi.org/10.4028/www.scientific.net/kem.881.45.

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Based on the current processing technology of large-scale spherical roller bearing rings, the dimensional expansion and contraction and the geometric variation of large-scale spherical roller bearing rings before and after heat treatment have been studied through several groups of processing experiment and data analysis. Optimization design of grinding allowance of large-scale spherical roller bearing rings have been implemented by using calculation formula of grinding allowance in bearing industry, which improved the production efficiency of the large spherical roller bearing rings and saved

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He, Zhi, Ling Chen, Tong Lu, and Jing Xie. "The optimization of pressure controller for deep earth drilling." Thermal Science 23, Suppl. 3 (2019): 877–85. http://dx.doi.org/10.2298/tsci180612123h.

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Obtaining samples of deep in-situ conditions is first step to explore the mysteries of the earth requires. In view of the current problems of insufficient pressure maintaining capacity of the existing equipment, we independently developed the in-situ fidelity coring system and designed the osmotic pressure controller based on the geometry of square cover. The finite element method is used to analyze the pressure maintaining capacity of the pressure controller. It is found that it would produce large deformation and stress concentration when the pressure was applied on, resulting in low pressur

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Visa, Ion, Mircea Neagoe, Macedon Moldovan, and Mihai Comsit. "Structural Synthesis of Parallel Linkages by Multibody Systems Method." Applied Mechanics and Materials 658 (October 2014): 153–58. http://dx.doi.org/10.4028/www.scientific.net/amm.658.153.

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A large variety of methods are mentioned in literature for the structural analysis and conception of parallel linkages, applicable to planar and/or spatial mechanisms developed for various applications as manipulators-robots, guiding mechanisms for car wheels and axle, solar tracking systems. Modern design requires today a unitary description of all the mechanisms in a product (including linkages) for complex simulation and optimization on software platforms. This paper proposes a seven steps general method for the parallel linkages’ structural analysis and synthesis, considered as Multibody S

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Cassinath, Zen, Ming Xu Xia, Yan Huang, and Zhong Yun Fan. "Process Optimization and Microstructure Control for Twin Screw Rheo-Extrusion of an AZ91D Magnesium Alloy." Materials Science Forum 765 (July 2013): 439–43. http://dx.doi.org/10.4028/www.scientific.net/msf.765.439.

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Twin screw rheo extrusion (TSRE) is a continuous semisolid forming process. The process takes advantage of the thixotropic properties of semisolid metal slurry and the high shear, controllable forward driving and self-sweeping capabilities of a counter rotating twin screw mechanism, offering a one-step melt-to-product forming technology with significant savings on energy consumption and manufacturing cost. The present work was carried out to investigate the feasibility of the process for processing light alloys using an AZ91D magnesium alloy and to obtain optimized operation conditions for mic

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Yan, Liang, Yinghuang Liu, and Zongxia Jiao. "Electromagnetic Modeling and Structure Optimization of a Spherical Force Sensing System." Sensors 19, no. 3 (2019): 552. http://dx.doi.org/10.3390/s19030552.

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Force sensing system (FSS) is widely used to simulate the control force of aircrafts for pilots. Conventional FSS employs multiple single-axis motors and complex transmission mechanisms to achieve multiple degree-of-freedom (DOF) force output of joystick, which may cause mismatched inertia and affect the output performance of FSS significantly. Therefore, one novel FSS with multiple DOF direct-drive spherical actuator is proposed in this paper to reduce the simulator’s extra inertia. To analyze its output performance systematically, a hybrid modeling method is proposed to formulate both Ampere

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32

Ananthasuresh, G. K., and S. N. Kramer. "Analysis and Optimal Synthesis of the RSCR Spatial Mechanisms." Journal of Mechanical Design 116, no. 1 (1994): 174–81. http://dx.doi.org/10.1115/1.2919342.

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A closed form solution of the analysis of the RSCR (Revolute-Spherical-Cylindrical-Revolute) spatial mechanism is presented in this paper. This work is based on the geometric characteristics of the mechanism involving the following three cases: the cone, the cylinder, and the one-sheet hyperboloid. These cases derive their names from the nature of the locus of the slider of the linkage as viewed from the output side. Each case is then treated separately to develop a closed form, geometry based analysis technique. These analysis modules are then used to optimally synthesize the mechanism for fu

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33

Guo, Lei, Zeyu Wang, Yuan Song, Xianjie Shan, and Dongming Gan. "Structural optimization of a new type of lever-assisted gear reducer based on a genetic algorithm." Mechanical Sciences 12, no. 1 (2021): 333–43. http://dx.doi.org/10.5194/ms-12-333-2021.

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Abstract. Gear reducers are critical for speed and torque transmissions between motors and manipulators. With the development of robotic research, many new requirements, such as low speed and heavy load, have been proposed for the design of gear reducers used in the joints. To meet these challenges, here, we present the design of a new gear reducer based on a spherical motion sub-lever drive mechanism. Our lever-based gear reducer can transmit the speed and torque from the input shaft to the output shaft through a fixed-axis gear train transmission, lever transmission, and internal translation

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Kregers, A. F., M. V. Gol'dmanis, and G. A. Teters. "Compromise optimization of a shallow spherical shell of fibrous composites." Mechanics of Composite Materials 24, no. 6 (1989): 822–26. http://dx.doi.org/10.1007/bf00610789.

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Salehizadeh, Mohammad, and Eric Diller. "Three-dimensional independent control of multiple magnetic microrobots via inter-agent forces." International Journal of Robotics Research 39, no. 12 (2020): 1377–96. http://dx.doi.org/10.1177/0278364920933655.

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This article presents a method to independently control the position of multiple microscale magnetic robots in three dimensions, operating in close proximity to each other. Having multiple magnetic microrobots work together in close proximity is difficult due to magnetic interactions between the robots, and here we aim to control those interactions for the creation of desired multi-agent formations in three dimensions. Based on the fact that all magnetic agents orient to the global input magnetic field, the local attraction–repulsion forces between nearby agents can be regulated. For the first

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Nie, Xin, Yi Chen, and Xiaoning Liu. "Scattering Analysis and Optimization of Spherical Acoustic Cloak with Unideal Pentamode Material." Acta Mechanica Solida Sinica 33, no. 3 (2019): 347–60. http://dx.doi.org/10.1007/s10338-019-00139-x.

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Gosselin, Clément, and Jorge Angeles. "Optimization of planar and spherical function generators as minimum-defect linkages." Mechanism and Machine Theory 24, no. 4 (1989): 293–307. http://dx.doi.org/10.1016/0094-114x(89)90049-9.

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Staicu, Stefan. "Dynamics of the spherical 3- $\mathit{U\underline{P}S/}S$ parallel mechanism with prismatic actuators." Multibody System Dynamics 22, no. 2 (2009): 115–32. http://dx.doi.org/10.1007/s11044-009-9150-x.

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Cui, Bing Yan, and Zhen Lin Jin. "Analysis of Structural Parameter and Design of Elbow Joint Rehabilitation Parallel Robot." Advanced Materials Research 749 (August 2013): 322–27. http://dx.doi.org/10.4028/www.scientific.net/amr.749.322.

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Elbow joint is one of the body's important joints, most of the activities of the human body are inseparable from the elbow joint, and including taking and holding movements.In order to increase the workspace of elbow joint, a novel elbow joint rehabilitation parallel robot based on 2-DOF orthogonal spherical parallel mechanism is proposed. First, the position inverse solution equation of elbow joint is established. Further, the workspace of elbow joint is analyzed. The optimal structural parameters are obtained by use of the objective function of optimization method. Finally, the virtual proto

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Liu, Zheng, and J. Angeles. "Optimization of Planar, Spherical and Spatial Function Generators Using Input-Output Curve Planning." Journal of Mechanical Design 116, no. 3 (1994): 915–19. http://dx.doi.org/10.1115/1.2919469.

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A general scheme for the optimization of planar, spherical and spatial bimodal linkages for function generation is proposed. The problem is solved here following two basic steps: (i) planning input-output ((I/O) curves based on design requirements and selecting data from the planned curve; and (ii) setting up an optimization procedure to minimize a performance index.

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Saiki, Naoto, Kenjiro Tadakuma, Masahiro Watanabe, et al. "2-DOF Spherical Parallel Mechanism Capable of Biaxial Swing Motion with Active Arc Sliders." IEEE Robotics and Automation Letters 6, no. 3 (2021): 4680–87. http://dx.doi.org/10.1109/lra.2021.3064187.

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42

Pelevin, Ivan A., Maxim A. Burmistrov, Dmitriy Yu Ozherelkov, et al. "Laser Powder Bed Fusion of Chromium Bronze Using Recycled Powder." Materials 14, no. 13 (2021): 3644. http://dx.doi.org/10.3390/ma14133644.

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Laser powder bed fusion (LPBF) of Cu-0.5Cr was carried out using recycled powder taken out from the LPBF machine after previous printing. Various volumetric defects characterized the powder wherein particle size distribution was the same as virgin powder. Using recycled powder resulted in extra spherical pore formation after the LPBF process. Despite that, a relative density of 99.2% was achieved by LPBF parameters optimization. Solidified microstructure with a small volume of defects consisted of an oversaturated dendritic Cu matrix and nano-sized Cr precipitations providing strengthening mec

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Yang, Yang, Chen, et al. "Study on Stiffness-Oriented Cable Tension Distribution for a Symmetrical Cable-Driven Mechanism." Symmetry 11, no. 9 (2019): 1158. http://dx.doi.org/10.3390/sym11091158.

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In this paper, we focus on the issues pertaining to stiffness-oriented cable tension distributionfor a symmetrical 6-cable-driven spherical joint module (6-CSJM), which can be employed to constructmodular cable-driven manipulators. Due to the redundant actuation of the 6-CSJM, three cables areemployed for position regulation by adjusting the cable lengths, and the remaining three cables areutilized for stiffness regulation by adjusting the cable tensions, i.e., the position and stiffness can beregulated simultaneously. To increase the range of stiffness regulation, a variable stiffness device(

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IRLE, S., G. ZHENG, Z. WANG, and K. MOROKUMA. "THEORY–EXPERIMENT RELATIONSHIP OF THE "SHRINKING HOT GIANT" ROAD OF DYNAMIC FULLERENE SELF-ASSEMBLY IN HOT CARBON VAPOR." Nano 02, no. 01 (2007): 21–30. http://dx.doi.org/10.1142/s1793292007000362.

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Though subject to intensive studies, the formation mechanism of buckminsterfullerene C 60 and related higher fullerenes has long evaded discovery. To elucidate their atomistic self-assembly mechanism, we have performed high-temperature quantum chemical molecular dynamics simulations on carbon vapor model systems initially consisting of C 2 molecules. Our simulations reveal a coherent mechanism how highly ordered fullerene cages naturally self-assemble under nonequilibrium conditions, following a series of irreversible processes from the polymerization of C 2 molecules to vibrationally excited

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Arai, Masayuki, and Shigeo Hirose. "Development of Cable Reel for Spherical Trailer – Uniform Cable Winding." Journal of Robotics and Mechatronics 20, no. 4 (2008): 533–40. http://dx.doi.org/10.20965/jrm.2008.p0533.

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Cabled communication is considered useful for rescue robots in post-disaster environments because the cable provides good signal communication and assists in retrieving the robot. Having said that, however, the cable could also hinder robot mobility and smaller robots lack payload capacity for reels. The spherical trailer cable reel we developed consists of a spherical trailer and a cable reel with a cable oscillator to oscillate the cable over the reel. Through experiments and studies, we identified a problem with the cable oscillator that prevented the cable from being wound uniformly over t

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Li, L. J., Z. H. Xie, Y. C. Guo, and F. Liu. "Structural optimization and dynamic analysis for double-layer spherical reticulated shell structures." Journal of Constructional Steel Research 62, no. 10 (2006): 943–49. http://dx.doi.org/10.1016/j.jcsr.2006.01.010.

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Fan, Kuang-Chao, Weili Wang, and Horng-Shing Chiou. "Fabrication optimization of a micro-spherical fiber probe with the Taguchi method." Journal of Micromechanics and Microengineering 18, no. 1 (2007): 015011. http://dx.doi.org/10.1088/0960-1317/18/1/015011.

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Geers, Thomas L., and Chung-Kyu Park. "Optimization of the G&H Bubble Model." Shock and Vibration 12, no. 1 (2005): 3–8. http://dx.doi.org/10.1155/2005/430767.

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A spherical model for the bubble created by an underwater explosion is enhanced to account, in approximate fashion, for the effect of bubble distortion on translation and dilation. The enhancement consists of introducing artificial drag in the formC|v|P, whereνis translation velocity, andC,Pproduce an optimum fit to empirical formulas for the second dilation maximum and first two translation jumps. The recommended values areC= 0.4 andP= 1 for charge weights between 100 lb–1000 lb and and depths exceeding 200 ft.

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Aleskeev, G. V., V. A. Levin, and D. A. Tereshko. "Simulation and Optimization in the Problems of Design of Spherical Layered Thermal Shells." Journal of Applied Mechanics and Technical Physics 60, no. 2 (2019): 323–31. http://dx.doi.org/10.1134/s0021894419020135.

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Alekhin, V. V. "Optimization of a layered spherical inclusion in an infinite matrix with uniaxial tension." Journal of Applied Mechanics and Technical Physics 35, no. 1 (1994): 117–22. http://dx.doi.org/10.1007/bf02369759.

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