Advanced Materials Research Vol. 680

Abstract: The purpose of this research is to discuss the machining stability in of the up and down milling of three milling systems: 1) the feed-direction one-dimension, 2) the normal-to-feed-direction one-dimension and 3) the symmetric two-dimension milling systems. A simplified model with time-invariant parameters is adopted to simulate the milling process. In this model, the elementary cutting function, which represents the trajectory of cutting force for a certain local cutting edge, plays an important role in affecting machining stability of the different cutting configurations. This paper presents an in-depth discussion on the effects of cutting configurations and radial depth of cut on the elementary cutting function, and also on the stability lobes. It is found that the elementary cutting function of one-dimension milling system is a real number, as well as its positive and negative values will lead to totally different chatter features. Most technical literatures focus on the chatter features of positive elementary cutting function, while this research discuss that of both positive and negative ones. On the other hand, for the two-dimension milling system, its machining stability found to be dominated by the eigenvalues of the elementary cutting function matrix. The comparison of machining stability in up and down milling is then analyzed and three conclusions are drawn in this research. Firstly, the feed-direction one-dimension milling system has better machining stability in up milling. Secondly, the normal-to-feed-direction one-dimension milling system has better machining stability in down milling. Thirdly, up and down milling both show the same machining stability in the symmetric two-dimension milling system.

Abstract: In order to improve the mechanical transplanting for flower seedling, a new robotic transplanter was introduced. The design of two key parts, grasper and transit unit, was emphasized. The grasper driven by a ring-shaped spring, was used to pick the seedling at its root from the tray-hole, and the elastic holding-pressure was easily adjustable, and advantageous to prevent rigid hurt on seedling root. The module of toothed belt and guide rail was applied in the transit unit to carry and locate the graspers, and the module is appropriate to the transplanting operation of less vibration and higher efficiency. Finally, the performance of driving elements for grasper and transit unit was verified, according to the simulated result on the virtual prototype based on ADAMS.

Abstract: The 3D simulation of tufted carpet pile loops need to calculate the direction loop pile. By simplifying the tufted carpet yarn into elongated elastic rod, without considering the extrusion between loops piles, applying pressure at both ends of loop pile. By analyzing the elastic rod stress deformation and using Matlab simulate to determine the yarn centerline direction with the flexible line. The simulation results show that the obtained yarn centerline path is consistent with the trend of actual loop pile.

Abstract: The electromagnetic technology of drying Paper is that we use the principle of electromagnetic heating to dry paper, which is a new paper drying technology and quite different from the traditional steam drying . This thesis is based on the principle of electromagnetic induction, combined with technical requirement of paper drying. We used the AutoCAD software design a laboratory drying device with electromagnetic, and analyzed various parts of the selection and structure, by using UG software solid modeling, assembly modeling and other modules design a three-dimensional simulation of the various parts of the electromagnetic dryer device. The simulation graphics shown that the simulation design of electromagnetic dryer is more success, which can meet the requirements of drying paper evenly.

Abstract: By use of ANSYS software, Without coated high temperature resistant coating and coated with high temperature resistant paint two model to simulate heat transfer analysis, so as to explore the preparation of the high temperature resistant coating insulation heat preservation effect.

Abstract: This document simulates the light leakage issue usually existed in liquid crystal display, and gains some experience conclusion. Simulation is mainly to the width of the black matrix (BM) located outside of the panel edge AA region, and ultimately determines the favorable range of value of the product, makes guidance to the product design.

Abstract: By simplifying the geometric shape of abrasive grain in a cone-shape, the authors conduct the 3D dynamic finite element simulation on profile grinding with axial feed by single abrasive grain using deform-3D software. Analysis is made on the influence upon the grinding forces in case of the same grinding speed, the same grinding depth and the same friction factor between wheel and workpiece at different axial feed. The results show that the normal force and the tangential force increase with the increase of axial feed, but the axial force decreases with the axial feed.

Abstract: In this paper, the transient turbulent flow field in ultra-precision aerostatic bearings is numerically investigated, with the focus on vortex structures and pressure distribution in the bearing clearance. In order to capture details of transient turbulent flow, large eddy simulation (LES) is employed. It is found that with the increase of air supply pressure, the flow in the recess becomes turbulent and vortex shedding occurs near the orifice outlet. It is also demonstrated that this unsteady vortex shedding results in pressure fluctuation in the bearing clearance, which is related to the experimentally observed small vibration of the bearing on the order of nanometers.

Abstract: In order to study the road friendliness of heavy vehicle under bilateral tracks’ excitation, the spatial domain random pavement under bilateral tracks’ excitation was simulated through the second-order rational function power spectral density (PSD) and the harmonic superposition method. A rigid-flexible coupling virtual prototype of the heavy vehicle was established by using SIMPACK software. Then a driving dynamic model of heavy vehicle was established under bilateral tracks’ excitation. The tires loads of the vehicle’s each axle were calculated. The dynamic load coefficient (DLC) and 95 percentage fourth power aggregate force were used as the road-friendliness criterions for studying the road-friendliness of heavy vehicles under bilateral tracks’ road excitation. The research results could provide the basis for the prediction of road friendliness of heavy vehicle.

Abstract: In order to study the interaction of flow around two full-scaled blades of Canoes which are used in sports competition, the numerical simulation is performed for computation of fluid dynamics (CFD) using Fluent, commercial software. Based on the turbulent model having been validated previously, the research is conducted to the two blades that are arranged at 12 different combinations of positions, in which the force applied on blades is also analyzed, in which the force applied on blades is also analyzed.