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< Page ,Total 51 >
An analytical framework for local and global system kinematic reliability sensitivity of robotic manipulators EI
期刊论文 | 2022 , 102 , 331-350 | Applied Mathematical Modelling
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Abstract :

This paper develops a novel analytical framework for system kinematic reliability sensitivity analysis of robotic manipulators, which can provide the analytical results of local and global reliability sensitivity defined on the pose and position errors. First, uncertainty analysis of the pose error of the end-effector is accomplished by virtue of the second-order closed-form error propagation formula on motion groups. Then, the system kinematic reliability, namely the probability of the system kinematic error located within the prescribed safe boundary, is analytically calculated. Specifically, the non-central chi-square approximation and expectation propagation technique are employed to compute the system kinematic reliability defined on the position and pose errors, respectively. On this basis, the local and global system kinematic reliability sensitivity of robotic manipulators are analytically obtained. Finally, the effectiveness of the proposed method is validated by comparison with the Monte Carlo simulation and Kriging modeling method. The results indicate the proposed method has good efficacy and efficiency in system kinematic reliability sensitivity analysis for robotic manipulators. © 2021

Keyword :

Uncertainty analysis Kinematics Intelligent systems Robotics Reliability analysis Flexible manipulators Monte Carlo methods Sensitivity analysis Errors

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GB/T 7714 Zhao, Qiangqiang , Hong, Jun . An analytical framework for local and global system kinematic reliability sensitivity of robotic manipulators [J]. | Applied Mathematical Modelling , 2022 , 102 : 331-350 .
MLA Zhao, Qiangqiang 等. "An analytical framework for local and global system kinematic reliability sensitivity of robotic manipulators" . | Applied Mathematical Modelling 102 (2022) : 331-350 .
APA Zhao, Qiangqiang , Hong, Jun . An analytical framework for local and global system kinematic reliability sensitivity of robotic manipulators . | Applied Mathematical Modelling , 2022 , 102 , 331-350 .
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Experimental and theoretical results of the performance of controllable clearance squeeze film damper on reducing the critical amplitude EI
期刊论文 | 2022 , 166 | Tribology International
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Abstract :

Aiming at the non-optimal performance of SFD under different operating conditions, this paper proposes a controllable clearance squeeze film damper (CCSFD) that uses hydraulic pressure to adjust the radial clearance and establishes a corresponding test rig. Measure the critical amplitude under different imbalances and hydraulic pressures. Give the calculation formula of hydrodynamic force by directly integrating pressure distribution and build the corresponding numerical model. Both experimental and numerical results show that CCSFD can achieve synchronous adjustment of the damper's performance under a non-stop state of the rotor system. In this case, the radial clearance can transform actively in the range of 1.75–3.19‰, which carries out a noticeable improvement of the damper's performance and achieves satisfactory performance under different operating conditions. © 2021

Keyword :

Shock absorbers Structural design Damping Hydraulic fluids Lubrication Rotating machinery

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GB/T 7714 Zheng, Wenbin , Pei, Shiyuan , Zhang, Qingshan et al. Experimental and theoretical results of the performance of controllable clearance squeeze film damper on reducing the critical amplitude [J]. | Tribology International , 2022 , 166 .
MLA Zheng, Wenbin et al. "Experimental and theoretical results of the performance of controllable clearance squeeze film damper on reducing the critical amplitude" . | Tribology International 166 (2022) .
APA Zheng, Wenbin , Pei, Shiyuan , Zhang, Qingshan , Hong, Jun . Experimental and theoretical results of the performance of controllable clearance squeeze film damper on reducing the critical amplitude . | Tribology International , 2022 , 166 .
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Research on the influence of air-gap eccentricity on the temperature field of a motorized spindle EI SCIE
期刊论文 | 2021 , 12 (1) , 109-122 | Mechanical Sciences
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Abstract :

The air-gap state between the stator and rotor is an important indicator to measure the performance of a motorized spindle. It affects the temperature field distribution of the motorized spindle and the machining accuracy of the mechanical parts. Since the accurate thermal model is the basis of the research on the temperature field distribution of the motorized spindle, in this paper, firstly, the mechanical loss, electrical loss and magnetic loss of the motor under different air-gap eccentricities are calculated and the heat-generating power of an angular-contact ball bearing is obtained based on Harries contact theory. Secondly, the thermal model of the motorized spindle is established and the steady-state temperature field of the motorized spindle is simulated by using ANSYS, and the influence of air-gap eccentricity on the temperature field of the motorized spindle is discussed. Finally, the circumferential temperature field distribution of the motorized spindle with the air-gap eccentricity is verified by experiment. The results show that the air-gap eccentricity has a significant influence on the non-uniform temperature field of the motorized spindle. © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License.

Keyword :

Magnetic devices Machining Machine tools Temperature Thermography (temperature measurement) Temperature control Angular distribution

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GB/T 7714 Li, Xiaohu , Liu, Jinyu , Li, Cui et al. Research on the influence of air-gap eccentricity on the temperature field of a motorized spindle [J]. | Mechanical Sciences , 2021 , 12 (1) : 109-122 .
MLA Li, Xiaohu et al. "Research on the influence of air-gap eccentricity on the temperature field of a motorized spindle" . | Mechanical Sciences 12 . 1 (2021) : 109-122 .
APA Li, Xiaohu , Liu, Jinyu , Li, Cui , Hong, Jun , Wang, Dongfeng . Research on the influence of air-gap eccentricity on the temperature field of a motorized spindle . | Mechanical Sciences , 2021 , 12 (1) , 109-122 .
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Hardness prediction considering the influence of alloying elements in laser hardening based on a 3D thermal model EI SCIE
期刊论文 | 2021 , 60 (26) , 7973-7982 | APPLIED OPTICS
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Taking the influence of alloying elements into consideration, a hardness prediction model based on a newly proposed parameter named actual carbon diffusion time (ACDT), which was calculated by combining temperature history with carbon diffusivity, is developed in this paper. The hardness distribution was directly derived from a 3D thermal model, which was constructed to simulate the laser surface hardening of AISI 1045, and from which the temperature history was also obtained. Using this 3D thermal model, the geometric characteristics after laser hardening (e.g., the width of the hardened layer, the depth of the phase change layer) were determined according to the martensitic transformation. The influences of the scanning speed and the laser power on the geometric characteristics were investigated, and the relations among the geometric characteristics after laser hardening were further determined. The laser hardening experiments with various parameters were conducted, and it was found that the hardness can be accurately predicted using the developed hardness prediction model (R-squared, 97.0%). The proposed parameter ACDT, as the core of the hardness prediction model in this paper, broadens the way for hardness prediction in laser hardening with the alloying effect involved. (C) 2021 Optical Society of America

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GB/T 7714 Wang, Chen , Lin, Qiyin , Sun, Yaoning et al. Hardness prediction considering the influence of alloying elements in laser hardening based on a 3D thermal model [J]. | APPLIED OPTICS , 2021 , 60 (26) : 7973-7982 .
MLA Wang, Chen et al. "Hardness prediction considering the influence of alloying elements in laser hardening based on a 3D thermal model" . | APPLIED OPTICS 60 . 26 (2021) : 7973-7982 .
APA Wang, Chen , Lin, Qiyin , Sun, Yaoning , Han, Chenyang , Hong, Jun . Hardness prediction considering the influence of alloying elements in laser hardening based on a 3D thermal model . | APPLIED OPTICS , 2021 , 60 (26) , 7973-7982 .
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Assembly torque data regression using sEMG and inertial signals EI SCIE
期刊论文 | 2021 , 60 , 1-10 | Journal of Manufacturing Systems
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Abstract :

Assembly torque monitoring is an important aspect of assembly process monitoring. Currently, in manual assembly lines, torque monitoring sensors are usually installed on assembly tools or assembly jigs. This approach is restricted by the working environment and assembly space. To this end, operators can use wearable devices containing sensors without being restricted by the tool and working spaces, with the added advantage of portability. To use wearable electromyography equipment to monitor the assembly torque, this paper proposes an assembly torque monitoring method using surface electromyography (sEMG) and inertial signals. Two torque regression models, one based on a heterogeneous-kernel-based temporal convolutional network (Het-TCN) and the other based on a two-stream convolutional neural network (CNN), are proposed and compared with CNN, long short-term memory (LSTM), and temporal convolutional network (TCN) models. The experimental results show that, compared with using sEMG signals alone, performing an assembly torque data regression using a combination of sEMG and inertial signals can significantly reduce the regression error. The proposed Het-TCN model has the best regression performance, with an average error of 3.31 N m an RMSE of 9.18 %, and a coefficient of determination R2 of 0.72. Thus, the proposed Het-TCN along with the application of both sEMG and inertial signals can help effectively perform assembly torque data regression, which can be used for assembly torque or operation monitoring. © 2021 The Society of Manufacturing Engineers

Keyword :

Torque Assembly Process monitoring Convolutional neural networks Jigs Convolution Regression analysis Long short-term memory Wearable sensors

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GB/T 7714 Chen, Chengjun , Huang, Kai , Li, Dongnian et al. Assembly torque data regression using sEMG and inertial signals [J]. | Journal of Manufacturing Systems , 2021 , 60 : 1-10 .
MLA Chen, Chengjun et al. "Assembly torque data regression using sEMG and inertial signals" . | Journal of Manufacturing Systems 60 (2021) : 1-10 .
APA Chen, Chengjun , Huang, Kai , Li, Dongnian , Pan, Yong , Zhao, Zhengxu , Hong, Jun . Assembly torque data regression using sEMG and inertial signals . | Journal of Manufacturing Systems , 2021 , 60 , 1-10 .
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Active suppression of milling chatter with LMI-based robust controller and electromagnetic actuator EI SCIE
期刊论文 | 2021 , 297 | JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
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Abstract :

Milling chatter occurs as undesired vibration in the cutting process, imposing negative effects on the tool's life, the quality of surface finishes and the limitation of machining efficiency. In this paper, a discrete output feedback robust controller based on linear matrix inequality (LMI) is developed for the chatter suppression, with an electromagnetic actuator applying the needed active control force. Considering the model of electromagnetic actuator and the actual mounting position in the milling system, active milling chatter control system is modeled and discretized for the controller's design. In addition, uncertainties of model parameters, such as modal parameters, axial cutting depth, are also considered. Then the LMI-based robust controller is designed, with which the performance of active chatter suppression can be guaranteed even the mentioned uncertainties exist in the actual milling system. Simulation results show that the chatter-free boundary of milling process is significantly enlarged with the designed robust controller. An experimental prototype for active milling chatter suppression is also presented, and milling chatter experiments are also performed with the developed spindle system, and the results show that surface finishes and chatter-free boundary are improved significantly.

Keyword :

Electromagnetic actuator Linear matrix inequality Milling chatter suppression Robust controller

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GB/T 7714 Li, Xiaohu , Wan, Shaoke , Yuan, Junpeng et al. Active suppression of milling chatter with LMI-based robust controller and electromagnetic actuator [J]. | JOURNAL OF MATERIALS PROCESSING TECHNOLOGY , 2021 , 297 .
MLA Li, Xiaohu et al. "Active suppression of milling chatter with LMI-based robust controller and electromagnetic actuator" . | JOURNAL OF MATERIALS PROCESSING TECHNOLOGY 297 (2021) .
APA Li, Xiaohu , Wan, Shaoke , Yuan, Junpeng , Yin, Yanjing , Hong, Jun . Active suppression of milling chatter with LMI-based robust controller and electromagnetic actuator . | JOURNAL OF MATERIALS PROCESSING TECHNOLOGY , 2021 , 297 .
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Research on Performance Enhancement of Quantum Dot Sensors for Temperature Monitoring of Rotating Components EI
期刊论文 | 2021 , 57 (14) , 188-194 | Journal of Mechanical Engineering
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Abstract :

All-inorganic cesium lead halide perovskite (CsPbBr3) quantum dots have shown great potential in the field of fluorescence temperature sensors due to their excellent optical properties. Focusing on the non-uniform fluorescence of CsPbBr3 quantum dots caused by uncontrollable in-situ crystallization strategy which is revolved around the temperature monitoring problem of bearing rotating components (bearing inner ring, bearing cage, et al) under high oil pollution and strong interference environment, a preparation-optimization method of CsPbBr3 quantum dots coated with polyvinylidene difluoride (PVDF), whose effectiveness is verified by means of microscopic morphology characterization, is proposed based on electrospinning technology and orthogonal experiment method, What's more, silicone resin (SR) coating process is used to improve the thermal stability of the perovskite quantum dot sensor. Finally, through temperature monitoring experiment of the bearing cage, it is demonstrated that the temperature monitoring performance of perovskite quantum dot sensor can be effectively enhanced by using electrospinning technology combined with SR coating process. © 2021 Journal of Mechanical Engineering.

Keyword :

Lead compounds Optical properties Bromine compounds Electrospinning Thermodynamic stability Nanocrystals Coatings Semiconductor quantum dots Silicones Cesium compounds Fluorescence Perovskite

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GB/T 7714 Liang, Panting , Zhang, Pan , Yan, Ke et al. Research on Performance Enhancement of Quantum Dot Sensors for Temperature Monitoring of Rotating Components [J]. | Journal of Mechanical Engineering , 2021 , 57 (14) : 188-194 .
MLA Liang, Panting et al. "Research on Performance Enhancement of Quantum Dot Sensors for Temperature Monitoring of Rotating Components" . | Journal of Mechanical Engineering 57 . 14 (2021) : 188-194 .
APA Liang, Panting , Zhang, Pan , Yan, Ke , Hong, Jun , Zhu, Yongsheng . Research on Performance Enhancement of Quantum Dot Sensors for Temperature Monitoring of Rotating Components . | Journal of Mechanical Engineering , 2021 , 57 (14) , 188-194 .
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A comprehensive study on the off-diagonal coupling elements in the stiffness matrix of the angular contact ball bearing and their influence on the dynamic characteristics of the rotor system EI SCIE
期刊论文 | 2021 , 158 | Mechanism and Machine Theory
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Abstract :

This paper not only presents the details of the composition form and classification method of the elements in bearing stiffness matrix, but also reveals the effects of the off-diagonal stiffness items in bearing stiffness matrix on the rotor dynamic characteristics. First, the complete expression of bearing stiffness matrix is derived based on the improved model of ball bearing, and the change rules of the different categories of the stiffness elements with the rotating speeds and loads are given. Then, both the quantitative and qualitative analysis methods for the rotor-bearing systems supported by a pair of the angular contact ball bearings are presented, and the effects of the off-diagonal bearing stiffness elements on the rotor supporting stiffness and natural frequencies are given and discussed. The results show that, when the rotor system is subjected to a radial load or moment load, the additional loads from ball bearings are generated due to the off-diagonal stiffness elements in bearing stiffness matrix, and the rotor with the O-configuration has higher supporting stiffness and resonance frequencies than the rotor with the X-configuration. © 2021 Elsevier Ltd

Keyword :

Stiffness Stiffness matrix Angular contact ball bearings Natural frequencies

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GB/T 7714 Fang, Bin , Yan, Ke , Hong, Jun et al. A comprehensive study on the off-diagonal coupling elements in the stiffness matrix of the angular contact ball bearing and their influence on the dynamic characteristics of the rotor system [J]. | Mechanism and Machine Theory , 2021 , 158 .
MLA Fang, Bin et al. "A comprehensive study on the off-diagonal coupling elements in the stiffness matrix of the angular contact ball bearing and their influence on the dynamic characteristics of the rotor system" . | Mechanism and Machine Theory 158 (2021) .
APA Fang, Bin , Yan, Ke , Hong, Jun , Zhang, Jinhua . A comprehensive study on the off-diagonal coupling elements in the stiffness matrix of the angular contact ball bearing and their influence on the dynamic characteristics of the rotor system . | Mechanism and Machine Theory , 2021 , 158 .
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Multilayer graphene and beta-Si3N4 whisker-reinforced porous Si3N4 ceramics by spark plasma incomplete sintering EI SCIE
期刊论文 | 2021 , 823 | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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Abstract :

Combining the advantages of spark plasma sintering (SPS) and incomplete sintering (IS) in preparation of Si3N4 ceramics, the spark plasma incomplete sintering (SPIS) was presented to fabricate porous Si3N4 ceramics. Considering balancing the contradictory relationship between the porosity and toughness, 1 wt% multilayer graphene (MLG) was incorporated into porous Si3N4 ceramics. Meanwhile, for the sake of compensating for the decrease in the hardness of porous Si3N4 ceramics induced by MLG, 0-8 wt% beta-Si3N4 whisker (beta-Si3N4w) were synergistically added. The element distribution, phase constitutions and microstructures of MLG/beta-Si3N4w-reinforced porous Si3N4 ceramics were characterized by energy dispersive spectroscopy (EDS), x-rays diffraction (XRD) and scanning electron microscope (SEM). The effects of beta-Si3N4w content on porosity, hardness and fracture toughness of porous Si3N4-based ceramics were analyzed. Results indicated that the porosity of porous Si3N4-based ceramics reached 21%, and then decreased significantly after the beta-Si3N4w content exceeded 4 wt%. The hardness of porous Si3N4-based ceramics obtained the maximum value 2.81 GPa when beta-Si3N4w was added 8 wt%, which was 31.92% higher than monolithic porous Si3N4 ceramic. The mass transfer, diffusion and fusion induced by beta-Si3N4w were considered to be the main responsible for the increase of hardness. The fracture toughness of specimen with 1 wt% MLG and 4 wt% beta-Si3N4w was advanced to 3.14 MPa m(1/2), which was 15.44% higher than monolithic porous Si3N4 ceramic. The markedly enhanced of the fracture toughness was attributed to the synergistic effects of crack deflection, pull-out and bridging resulted by MLG/beta-Si3N4w.

Keyword :

Porosity Hardness beta-Si3N4 whisker Fracture toughness Porous Si3N4 ceramics Multilayer graphene

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GB/T 7714 Chen, Fei , Yan, Ke , Zhou, Jianping et al. Multilayer graphene and beta-Si3N4 whisker-reinforced porous Si3N4 ceramics by spark plasma incomplete sintering [J]. | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2021 , 823 .
MLA Chen, Fei et al. "Multilayer graphene and beta-Si3N4 whisker-reinforced porous Si3N4 ceramics by spark plasma incomplete sintering" . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 823 (2021) .
APA Chen, Fei , Yan, Ke , Zhou, Jianping , Zhu, Yongsheng , Hong, Jun . Multilayer graphene and beta-Si3N4 whisker-reinforced porous Si3N4 ceramics by spark plasma incomplete sintering . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2021 , 823 .
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Microscale simulation method for prediction of mechanical properties and composition design of multilayer graphene-reinforced ceramic bearings EI SCIE
期刊论文 | 2021 , 47 (12) , 17531-17539 | CERAMICS INTERNATIONAL
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Herein, a microscale simulation method for the prediction of mechanical properties and composition design of multilayer graphene (MLG)-reinforced ceramic bearings was presented. The method aims at improving the toughness of the ceramic bearings and overcoming the disadvantages of the trial-and-error approach implemented in the research of ceramic bearings. Considering the most widely used Si3N4 ceramic bearing as an example, the microscale models of 1-4 wt% MLG-reinforced Si3N4 ceramic bearings were established using the Abaqus software and on the basis of the ASTM standards. The simulation results obtained through the proposed method and the previously reported experimental results for the mechanical properties demonstrated good agreement. The simulated optimal MLG content value of 1 wt% was consistent with that reported in previous studies, which confirmed the effectiveness of the proposed method. The flexural strength and fracture toughness of the MLG-reinforced Si3N4 ceramic bearings reached the maximum values of 761.77 MPa and 7.23 MPa m1/2 upon the addition of 1 wt% MLG, which were enhanced by 25.85% and 59.96%, respectively, compared with monolithic Si3N4 ceramic bearing. Conversely, the introduction of MLG imparted a softening effect on the Si3N4 ceramic bearings and, therefore, showed reduction in bearing hardness. Moreover, the MLG bridging phenomenon, previously observed experimentally, was revealed through simulation for the first time, which provided an explanation for the toughening mechanism.

Keyword :

Ceramic bearings Multilayer graphene bridging Microscale simulation Mechanical properties Silicon nitride

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GB/T 7714 Chen, Fei , Yan, Ke , Zhang, Xiaohong et al. Microscale simulation method for prediction of mechanical properties and composition design of multilayer graphene-reinforced ceramic bearings [J]. | CERAMICS INTERNATIONAL , 2021 , 47 (12) : 17531-17539 .
MLA Chen, Fei et al. "Microscale simulation method for prediction of mechanical properties and composition design of multilayer graphene-reinforced ceramic bearings" . | CERAMICS INTERNATIONAL 47 . 12 (2021) : 17531-17539 .
APA Chen, Fei , Yan, Ke , Zhang, Xiaohong , Zhu, Yongsheng , Hong, Jun . Microscale simulation method for prediction of mechanical properties and composition design of multilayer graphene-reinforced ceramic bearings . | CERAMICS INTERNATIONAL , 2021 , 47 (12) , 17531-17539 .
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