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The confocal image alignment assembly principle is briefly proposed and the micro-assembly system based on this alignment principle is set up. The confocal image alignment principle can greatly improve the accuracy and efficiency of the micro-assembly. The composition of micro-assembly system is introduced in detail. The detection accuracy of the laser scanning confocal microscope can reach the submicron...
A coupling analysis method of manufacturing characteristics and mechanics property of microminiature gear mechanism based on BP neural network was proposed. By use of the existing finite element model with manufacturing characteristics, output data as BP neural network training set of samples was obtained. Through a comparative study of the effects of different network parameters settings on the precision...
In order to resolve the issue of large-scale assembly for quasi-LIGA micro-parts, the purpose of this paper is to propose a novel method of orthogonal optical precise alignment. The micro-assembly experiment system set-up was constructed according to the principle of the orthogonal precise alignment. One single-position consists of three components: 3-DOF micro motion worktable, micro force feedback...
A perpendicularity adjustment method for camera optical axis based on automatic partition focusing was proposed to improve the spatial positioning accuracy of monocular micro-vision for plate microstructure. The method combines high-precision focusing technology and focusing distance accurate measurement technology. Based on the focusing distance deviation of corresponding region and the center distance...
This paper focuses on a case study on dynamic characteristics analysis and dynamic stiffness evaluation of a reconfigurable turn-milling machine tool. The structural dynamics analysis and evaluation on CNC machines, which has become one of the utmost technologies to resolve vibration problems, is frequently applied for detecting machine anti-vibration property and evaluating vibration analysis accuracy...
The contact between real rough machined surface is simulated using a multilevel contact model in this paper. The model divide total surface deflection into macro and micro scale two parts. They are also calculated at the macro and the asperity level, respectively. Wavelet is used to decompose and reconstruct macro-scale contact model. Micro-scale contact model is established based on FFT method. Real...
To solve the problem of the machining equipment with low flexibility, low efficiency and high cost in Remanufacturing, the reconfigurable multi-process combined machining method and implementation technology are systematically proposed, including the machining methods in remanufacturing for the repaired parts with various forms, the reconfigurable structure design method of multi-process combined...
Based on state space, a variation propagation model of multi-station assembly of precision mechanical system was developed. Machining errors generally have great effects on the performance of mechanical system, especially precision mechanical system. In a multi-station assembly process, machining errors at each station accumulate and propagate to other parts, which will eventually degrade assembly...
On the basis of a new non-linear magnetic circuit analytic model, the inductance of Permanent Magnetic Linear Synchronous Machine (PMLSM) has been calculated in this paper. The impact of magnetic saturation has been significantly considered in this model. So the dynamic inductance is obtained as a function of magnet position and current. Meanwhile, it also presents the fundamental reasons about the...
Concept and key technologies of local-scale RMT were presented in this paper. The new paradigm combined with turn-milling technology can be used to manufacture mesoscale parts. Aimed at the collision prevention of changeable modules in local-scale RMT, a new concept and method of dynamical software limitation was presented. The method of modeling RMT is given. By stratifying the maximum movable space...
Reconfigurable turn-milling machine tool is the cooperative product of reconfigurable machine tool technology and turn-miling process. With the quick reconfiguration of different modules, the machine tool can adjust to produce a part family in a lower cost and higher efficience. The method and process of designing turn-milling RMT is discussed in this paper. Using commercial off the shelf (COTS) method,...
Because the OFDM signal has higher Peak to Average Power Ratio (PAPR), the efficiency of Amplifier is badly influenced in Orthogonal Frequency Division Multiplexing (OFDM) system and caused signal distortion in-band. Therefore, reducing PAPR of OFDM signal is very important. The Partial Transmitted Sequences (PTS) method can effectively reduce PAPR of the OFDM signals, but the basic algorithm of PTS...
At present, the simulation model does not fully reflect the effects of machining errors, surface quality and assembly errors which are produced during the manufacturing process on the performance of parts. This makes the simulation results differ greatly from experiment results. In order to solve this problem, simulation modeling technology of the performance of mechanical system based on manufacturing...
Theoretical analysis of the precision ensuring mechanism of reconfigurable machine interface using over-positioning technology was thoroughly presented. Based on the obtained rule of over-positioning precision, positioning pin number and interfere probability, the concept of two-state positioning aiming at the positioning difficulty of rigid over-positioning machine interface was proposed. In addition,...
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