Papers by Keyword: Deflection Angle

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Authors: D. Popovici, Veronica Paltanea, Gheorghe Paltanea, Gabi Jiga
Abstract: In many industrial and biomedical applications (laser scanning displays, optical switch matrices and biomedical imaging systems) the sensing and actuation components are realized using micro-mirrors fabricated by MEMS technology. In this paper is evaluated, through numerical methods, the structural mechanical properties of the actuation mechanism of a ring shape micro-mirror. For the lift-off of the structure there are used four springs simulating a prestressed cantilever beam.
Authors: Jae Hyun Shim, J.H. Ok, Hyoung Jin Choi, H.S. Koo, Beong Bok Hwang
Abstract: Conventional multi-step extrusion processes with solid billet are examined by the rigid-plastic finite element method in order to provide criteria for new process sequence for hollow parts. Two examples are taken for the analyses such as the current three-stage cold extrusion process for a hollow flange part and five-stage process for manufacturing an axle housing. Based on the results of simulation of the current three-stage and five-stage manufacturing processes, new design strategy for improving the process sequences is developed simply by replacing the initial billet from solid to hollow one. The developed new process sequences are applied for simulation by FEM and they are compared with the existing processes to confirm the usefulness of new process sequences with hollow initial billets. The results of simulation show that the newly proposed process sequences with hollow billet instead of solid one are more economical way to manufacture required parts, respectively.
Authors: Wen Feng Tu, Zeng Liang Gao, Zhao Ji Hu
Abstract: The experiments of mixed-mode I-II fatigue crack growth under stress redistribution at crack tips were conducted with compact specimens made of 16MnR steel. This test consisted of the 1st, the 2nd and 3rd step. When the crack reached a certain length in 1st step, the loading direction was switched to a certain angle. Finally, the loading direction was returned to the original orientation. The stress redistribution of mixed-mode fatigue was formed by altering the loading direction at propagating crack tips. A finite element analysis was also conducted to obtain the and values, and then mixed-mode crack growth parameters were adopted to evaluate the crack growth rate and crack paths. The crack growth paths had a tendency perpendicular and across to the loading axis. Right after the loading direction was changed, the crack growth rate was decreased rapidly, and crack growth paths under the stress redistribution zone (SRZ) were affected.
Authors: Man Zhao, Shu Rong Yu, Chao Li, Yang Yu
Abstract: Studies on leakage and friction have received considerable attention in scroll compressor, especially which between the fitting surface of orbiting scroll and fixed scroll, as they affect the scroll compressor performance. According to the scroll compressor working principle and structure, combined with the force model of the orbiting scroll, the overturning moment on the orbiting scroll was analyzed and verified by a specific example, in which the azimuth angle and of the overturning moment action line were calculated and compared. The results show that the overturning moment will have a significant effect not only on the leak and friction loss at the fitting surface of orbiting and fixed scroll, also on the dynamic characteristics of the orbiting scroll due to the linear change of the azimuth angle and the unstable of the azimuth angle . The result is helpful for the study on leakage, friction, and the dynamics and tribology coupling problem research of scroll compressor.
Authors: Ze Chao Jiang, Fan Yang, Jian Lan, Qing Chao Tian, Wei Dong Xuan, Zhong Ming Ren
Abstract: Preparation of Mn-Cu based damping alloy ingots coupled with strong magnetic fields shows many interesting phenomena on the solidification microstructure and the crystal lattice. In this study, modified M2052 ingots were prepared under different magnetic fields to investigate the bulk solidification behavior by using optical microscopy, scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. Metallographic analysis reveals that the deflection angle of the primary dendrite arm increases with the increase of magnetic field strength. The distribution of chemical composition characterized by X-ray Fluorescence discloses that Mn is enriched while Cu is depleted along the circumferential surface side, and the variation tendency changes from almost a level to a sloping line under applied magnetic field. High magnetic field have altered the orientation of the γ-Mn dendrites from (200) to (111), and the coupling mechanism of alloy solidification with strong magnetic field is discussed based on the experimental results.
Authors: Xiao Shan Jiang, Ting Liang Chu
Abstract: In order to prevent the deflecting jet, a hypothetical model of local micro impurity is proposed to investigate the transformation of capillary jet on the deflection angle, jet direction, and local pressure. The changes are revealed as the local impurity lies at the different places of inner orifice wall. The simulation results agree with the experiments that the capillary jet deflects as the impurity lies in the orifice of capillary nozzle, which proves that the hypothetical model of local micro impurity is reasonable. Cleaning measures are taken to eliminate the jet deflection. This work is useful to improve the direction accuracy and the stability of capillary jet for the subsequent inkjet process in complex curved surface printing.
Authors: Guo Ya Xu, Jun Hua He, Fan Sen, Yuan Tao Zhu
Abstract: Design an all-optical solid-state scanner chip, which can realize high speed light deflection in a very small space, instead of electron beam deflection scan image converter tube and opto-mechanical scanner, cancel the complicated mechanical components, use the all-optical scanning to realize the super fast phenomenon observation. The beam deflection system is based on semiconductor optical waveguide core layer carrier induced refractive index change effect to realize, its development work is mainly divided into semiconductor optical waveguide and saw prisms two parts. And through the experiment, we measured deflection angle of the scanner chip to 1053nm signal light.
Authors: Zhong Ying Liu
Abstract: Based on the two degree of freedom model of kiloton all-terrain crane, he effects of relationship of deflection angle on turning radius were investigated in multi-axle steering system. MATLAB/Simulink was used to analyze the relationship of every axle in multi-axle steering and optimize the minimum turning radius. The studies show that the kiloton all-terrain crane adapted all-wheel steering driving at 5speed , and the front wheel angle was 32.3°, as compared to the rolling radius before optimization, the turning radius in all wheel turnaround reduced by 33%, which improved the vehicle capacity through the complex curve and increased the vehicle steering flexibility.
Authors: Ya Dong Gong, Guo Qiang Yin, Chao Wang, Xue Long Wen, Jun Cheng
Abstract: There is a vitrified bond CBN point grinding wheel with coarse grinding area slope angle θ. This new grinding wheel has higher removing rate and better machining accuracy than conventional wheels. The design and manufacture principle of the new grinding wheels are studied in this paper. These wheels with different coarse grinding area slope angle θ are used to grind the stepped shaft of QT700 with a series of grinding parameters.VHX-1000E microscopic system and Micromeasure system are used to measure the surface quality of workpiece. In the same group of grinding parameters, compare the effect of these different wheels on surface roughness. The effect of deflection angle α on surface roughness is generalized.
Authors: Da Peng Cui, Ying Xue Yao, Dong Li Qin
Abstract: It is an important performance for gyroscopes to read out the angle information of the gyroscope rotor accurately. There are few methods for measuring the deflection angle of gyroscopes, and they are only fit for the special rotors. A new method based on laser triangulation with position sensitive device (PSD), and the calculation theory of measuring the deflection angle are presented in this paper, which is designed for measuring the deflection angle of a new type gyroscope rotor, and can improve the precision of measuring by several reflections. It indicates by calculation that the method presented in this paper is feasible, and the precision can be improved several times by many reflections, furthermore, the more the number of reflection is, the higher the precision of measurement is improved.
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