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RISS 인기검색어
- 검색키워드
- 저자 : Lingmin Xu (검색결과 3 건)
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Tex3: An 2R1T Parallel Manipulator with Minimum DOF of Joints and Fixed Linear Actuators
Lingmin Xu,Qinchuan Li,Junhua Tong,Qiaohong Chen 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.19 No.2
A new 2R1T (R: rotation, T: translation) parallel manipulator (PM), called Tex3, is proposed. The Tex3 PM is a 2PUR-PRU PM consisting of 9 joints with 12 DOFs (degrees of freedom), and can be actuated by fixed linear actuators. Mobility analysis shows that it is an RPR-equivalent PM whose finite motion is the product of a rotation (R) followed by a translation (P) and another rotation (R). Inverse position and velocity analyses are discussed. Furthermore, the local transmission index and good transmission workspace are used to evaluate the motion/force transmissibility of the proposed PM. The singularity loci of the proposed PM are obtained according to the motion/force transmissibility, corresponding to the inverse, forward and combined kinematic singularity. The constraint singularity is also discussed. Finally, link parameters are optimized to obtain an improved good transmission workspace. Because of its minimum DOF of joints and fixed linear actuators, the Tex3 PM has good kinematic performance and is suited to the high-speed machining of workpieces with curved surfaces.
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Chenyang Rao,Lingmin Xu,Qiaohong Chen,Wei Ye 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.6
The orientation ability and accuracy of parallel kinematic machines (PKMs) with two rotational and one translational outputs (2R1T) can be improved with the mechanical structures of 2R1T PKMs with limited degrees of freedom (DOF) limbs, fewer single-DOF joints, and no spherical joints. However, few existing 2R1T PKMs satisfy these conditions. This study proposes a new over-constrained 2UPR-PRU (where U, P, and R represent universal, actuated prismatic, and revolute joints, respectively) PKM with 2R1T DOFs with three limited-DOF limbs, no spherical joints, only 12 single-DOF joints, and one fixed motor. First, mobility, inverse displacement, and singularity analysis are carried out. Inverse dynamic models of the PKM are then established based on screw theory. Velocities, accelerations of limbs and moving platform, and actuation forces are derived. Simulation is carried out to verify the dynamic model, including the comparisons of actuation velocities, accelerations, and forces. Rotational and translational dynamic manipulability ellipsoid indices of the PKM in different operational heights are evaluated. The proposed PKM has good potential for machining work pieces with curved surfaces.
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A graphene‑based highly sensitive aptasensor for the detection of lung cancer marker CA125
Junnan Chen,Lingmin Yu,Wenzhen Xu,Tao Lin,Sicong Jiang,Caijin Jin 한국탄소학회 2023 Carbon Letters Vol.33 No.6
Graphene-based sensors have emerged as significant tools for biosensing applications due to their unique electrical, mechanical, and thermal properties. In this study, we have developed an innovative and sensitive aptasensor based on the surfacemodified graphene for the detection of lung cancer biomarker CA125. The sensor leverages the combination of graphene surface and gold nanoparticles (AuNPs) electrodeposition to achieve a high level of sensitivity and selectivity for the biomarker detection. A noticeable decrease in electron transfer resistance was observed upon the AuNPs deposition, demonstrating the enhancement of electrochemical performance. Our experimental findings showed a strong linear relationship between the sensor response and CA125 concentrations, ranging from 0.2 to 15.0 ng/mL, with a detection limit of 0.085 ng/ mL. This study presents a novel approach to lung cancer detection, surpassing the traditional methods in terms of invasiveness, cost, and accuracy. The results from this work could pave the way for the development of graphene-based sensors in various other biosensing applications.
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