Development of a 3-DOF Mobile Positioning Mechanism with 6 Contact Points

2012 ◽  
Vol 516 ◽  
pp. 136-141
Author(s):  
Manabu Yatsurugi ◽  
Ohmi Fuchiwaki
Keyword(s):  
Piezoelectric Actuators ◽  
Experimental Results ◽  
Design Development ◽  
Contact Points ◽  
Mobile Positioning ◽  
Inchworm Mechanism

In this paper, we describe the design, development and experimental results of a 3-DOF precise inchworm mechanism with six contact points. During the last ten years, we have developed an omnidirectional and holonomic inchworm mechanism to provide flexible, compact, and precise microscopic processing. In a previous mechanism, four piezoelectric actuators connected a pair of U-shaped electromagnets arranged to cross each other so that the mechanism can move precisely in any direction. However, positioning repeatability was made difficult by an inclination of the U-shaped electromagnets. Therefore, we designed a new omnidirectional inchworm mechanism composed of a pair of Y-shaped electromagnets and six piezoelectric actuators to prevent the inclination of the electromagnets. In addition, we explain the drive principle of the newly developed mechanism. Finally, we show the experimental results of the positioning repeatability of translational motions in four directions with a payload.

scholarly journals Polishing of Silicon Nitride Ceramic Balls by Clustered Magnetorheological Finish

Micromachines ◽  
2020 ◽  
Vol 11 (3) ◽  
pp. 304
Author(s):  
Xiao-lan Xiao ◽  
Guang-xian Li ◽  
Hai-juan Mei ◽  
Qiu-sheng Yan ◽  
Hua-tay Lin ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Analytical Model ◽  
Surface Finish ◽  
Experimental Results ◽  
Machined Surface ◽  
Silicon Nitride Ceramic ◽  
Ceramic Ball ◽  
Contact Points ◽  
Micro Morphology ◽  
Improve Surface Finish

In this study, a novel finishing method, entitled clustered magnetorheological finish (CMRF), was proposed to improve surface finish of the silicon nitride ( Si 3 N 4 ) balls with ultra fine precision. The effects of different polishing parameters including rotation speeds, eccentricities and the machining gaps on surface finish of Si 3 N 4 balls were investigated by analyzing the roughness, sphericity and the micro morphology of the machined surface. The experimental results showed that the polishing parameters significantly influenced the surface finish. The best surface finish was obtained by using the polishing parameters: the machining gap of 0.8 mm, the eccentricity of 10 mm and the rotation ratio of 3/4. To further investigate the influence of the polishing parameters on the surface finish, an analytical model was also developed to analyze the kinematics of the ceramic ball during CMRF process. The resulting surface finish, as a function of different polishing parameters employed, was evaluated by analyzing the visualized finishing trace and the distribution of the contact points. The simulative results showed that the distribution and trace of the contact points changed with different polishing parameters, which was in accordance with the results of experiments.

Influence of Microstructure on Pass through Flux of High Purity Ni

2016 ◽  
Vol 848 ◽  
pp. 696-702 ◽  
Author(s):  
Guo Jin Xu ◽  
Jun Feng Luo ◽  
Yong Jun Li ◽  
Jin Jiang He ◽  
Xiao Yong Wan ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
Grain Growth ◽  
High Purity ◽  
Ferromagnetic Materials ◽  
Experimental Results ◽  
Design Development ◽  
Essential Parameter ◽  
Pass Through ◽  
Magnetic Sputtering ◽  
Annealing Microstructure

Pass through flux (PTF) is an essential parameter for the magnetron sputtering process of ferromagnetic materials. In the present investigation the influence of deformation, recrystallized microstructure and thickness on PTF of Ni was examined by the analysis of microstructure and hardness of high purity Ni. The experimental results showed that PTF of rolled Ni increased significantly comparing to the annealing microstructure that is related to the dislocation and stress of microstructure. With the recrystallization and grain growth of deformed samples, PTF decreased to be about 30%. PTF was also associated with the thickness of material. It increased by 6% when the thickness of 0.5mm decreased. This research is useful to guide and improve the design, development and preparation of magnetic sputtering materials.

Neural Network-Based Adaptive Monitoring System for Power Transformer

1999 ◽  
Author(s):  
Andy Ottele ◽  
Rahmat Shoureshi ◽  
Duane Torgerson ◽  
John Work
Keyword(s):  
Neural Network ◽  
Power Transformer ◽  
Diagnostic Technique ◽  
Major Elements ◽  
Hopfield Network ◽  
Experimental Results ◽  
Adaptive Observer ◽  
Physical Parameters ◽  
Design Development ◽  
Adaptive Monitoring

Abstract Power transformers are major elements of the electric power transmission and distribution infrastructure. Transformer failure has severe economical impacts from the utility industry and customers. This paper presents analysis, design, development and experimental results of a robust failure diagnostic technique. Hopfield neural networks are used to identify variations in physical parameters of the system in a systematic way, and adapt the transformer model based on the state of the system. In addition, the Hopfield network is used to design an observer which provides accurate estimates of the internal states of the transformer that can not be accessed or measured during operation. The estimated physical parameters are then passed to a neural network to be classified into regions representing various parameter patterns. Analytical and experimental results of this adaptive observer for power transformer diagnostics are presented.

scholarly journals Development of Traveling Wave Actuators Using Waveguides of Different Geometrical Forms

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Ramutis Bansevicius ◽  
Dalius Mazeika ◽  
Vytautas Jurenas ◽  
Genadijus Kulvietis ◽  
Vytautas Bakanauskas
Keyword(s):  
Experimental Study ◽  
Numerical Modelling ◽  
Contact Surface ◽  
Experimental Analysis ◽  
Traveling Wave ◽  
Piezoelectric Actuators ◽  
Operating Principle ◽  
Contact Points ◽  
Cone Type ◽  
Different Types

The paper covers the research and development of piezoelectric traveling wave actuators using different types of the waveguides. The introduced piezoelectric actuators can be characterized by specific areas of application, different resolution, and torque. All presented actuators are ultrasonic resonant devices and they were developed to increase amplitudes of the traveling wave oscillations of the contact surface. Three different waveguides are introduced, that is, symmetrical, asymmetrical, and cone type waveguide. A piezoelectric ring with the sectioned electrodes is used to excite traveling wave oscillations for all actuators. Operating principle, electrode pattern, and excitation regimes of piezoelectric actuators are described. A numerical modelling of the actuators was performed to validate the operating principle and to calculate trajectories of the contact points motion. Prototype actuators were made and experimental study was performed. The results of numerical and experimental analysis are discussed.

Design, development and experimental results of a solar distillery for the essential oils extraction from medicinal and aromatic plants

Solar Energy ◽  
2014 ◽  
Vol 108 ◽  
pp. 548-559 ◽  
Author(s):  
Anjum Munir ◽  
Oliver Hensel ◽  
Wolfgang Scheffler ◽  
Heike Hoedt ◽  
Waseem Amjad ◽  
...  
Keyword(s):  
Essential Oils ◽  
Experimental Results ◽  
Design Development ◽  
Aromatic Plants ◽  
Medicinal And Aromatic Plants
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