Applied Mechanics and Materials Vol. 684

Abstract: High Level Architecture is a software in 1995 USA DOD which is first introduced in the modeling and Simulation of the outline of the interoperability specification. based on which can generate the general technical framework of computer simulation system. The adhesive will complex the small simulation system into a requirements large one. In this paper, the technology framework based on the construction of aircraft, tactical maneuver simulation system has be built.

Abstract: Abstract: The design and manufacture of mold often rely on the experience of the designers, which led to the fact that the mold needs to be repeatedly debugged and corrected. Numerical simulation technology enables the simulation of the forming process of sheet metal and prediction of defects in design, thus to improve labor efficiency, save time and reduce costs. In this paper, the software Dynaform is used as a platform and a three-dimensional model is built to numerical simulate and analyze the drawing deep of a typical thin-walled cylindrical piece.Orthogonal experimentis adopted to analyze the impact of BHF, punching speed and punch-die gap on forming quality of the drawing pieces. With minimum thickness and wrinkling as indicators, the impact of various factors is analyzed and a set of optimum parameters is found out that is, BHF is 20kN, punching speed is 2000mm / s and punch-die gap is 0.9mm.

Abstract: The main approach to obtain nanomaterial is nanospinning technology at present. Due to the inherent characteristics of nanomaterial itself, which are easily affected by the electric field force effect of spinning. And for the spinning machine nozzle electric field is relatively complex, so nanospinning products at present, is easily affected by the electric field force and dissipated. So, the nanospinning collection efficiency is low. This paper adopts an oval enhanced electrostatic mechanism, method of using additional electric field to improve the balance obtained nanomaterial collection rate. And the construct high voltage electrostatic spinning machine virtual prototype,complete the analysis of the improved method of static electric field. The analysis results indicate that the electric field can effectively improve the collection rate of nanospinning. Through the study of the additional electric field strength further size on the electric field force and the ellipse, can more effectively improve the collection rate of nanospinning products.

Abstract: The study has considered the challenge of improving the efficiency of carbide end mills through modification of the physical and mechanical properties of tool by forming on its working surfaces nanostructured multi-layered composite coatings with use of filtered cathodic vacuum arc deposition (FCVAD). The technique of deposition of three-component multi-layered composite coatings with nanosized grain structure and thickness of sublayers on working surfaces of end mills has been developed. The developed coatings contain three key components, each of which has a strictly functional purpose specifying enhanced wear resistance, strong adhesive bonding with tool material and barrier properties with regard to heat flows and diffusion, and that allows improving the efficiency of carbide end mills. The study has found out that when carbide end mills with developed coatings are used at cutting, the cyclic thermomechanical stresses acting on the cutting part of the tool during the cutting stroke and idle run of cutting edge of end mills are smoothed, and that leads to the decrease in the rate of tool wear and improves the efficiency of carbide end mills. The study was supported by grant No. 9.251.2014/K, project code 251.

Abstract: To meet the urgent demand of maintenance and lifting equipment for wind turbine, combined with designation demand, two kinds of primary structure of the maintenance and lifting equipment has been proposed, analyzed and compared. By means of the Solid Works software the initial design on the two kind of the machine, the self-climbing crane and the trailed hoisting platform, have been conducted, the static analysis has been performed based on the mechanics model, and the advantages and disadvantages of these methods have been pointed out and compared in the paper. Compared with the self-climbing crane, the mechanical structure of the trailed hoisting platform is simpler, the control system presented more reliable, simple, easier realized etc, and the cost is lower. The self-climbing crane is high-automatic, but the design of crane high in the free degree and high in difficulty, and the climbing force focused on the wind turbine tower is too large. Conclusion The trailed hoisting platform is determined as the main design method to design the maintenance and lifting equipment for wind turbine.

Abstract: This article deals with the study of the sealing properties on a bolted joint on a hydrostatic transmission. The main idea of this study is aimed at the probability assessment of fluid leakage due to the mechanics that play a significant role in the sealing properties. The study was performed via numerical analyses by using a FEM software package, ANSYS Workbench. The main focus when evaluating the results is aimed at the observation of the contact pressure and contact gap on the bolted joint. In this study two variables on the bolted joint, which can affect the sealing properties were taken into account, the torque applied through the bolts and the surface finish under the heads of the bolts.

Abstract: Using ProE software establish the digital prototype of wind power maintenance lifting platform and the clamping mechanism, import the clamping mechanism into ANSYS to analysis the static strength. Select the forced major important parts in clamping mechanism,hydraulic cylinder connecting pin board,use the Design Explorer modules in ANSYS Workbench introducing the response curves to do the optimum design, set the thickness of hydraulic cylinder connecting pin board and the work position of the hydraulic cylinder for the input parameters variable,with pin board by stress as output parameter variable, from nine groups of data, selecting the smallest stress group as the new design, analysis and calculate again. Results show that by stress of the optimized clamping mechanism is obviously improved, and the structure of whole clamping mechanism more reasonable and compact.

Abstract: Combining the method of finite element analysis with fatigue life prediction, fatigue cracks on the shaft parts is analyzed with cyclic loading. Analyzing the shafts with different sizes of cracks in different locations, a simulation modal is established. Informed by analytical and numerical simulation method, the crack formation and propagation life could be calculated. With considering the relationship of "Frequency - crack - fatigue life - remanufacturing ", the remanufacturability of the shaft parts might be evaluated based on service condition. And in this paper, a more convenient way to detecting and predicting the fatigue cracks on shaft parts is given.

Abstract: Traditional jaw crusher has the problems of unreasonable structure, heavy weight, low utilization of material and high cost. This paper chooses the flywheel which has great influence on the total weight as the research object. Finite element method are used to anlysis stress and displacement distribution under the action of maximum crushing force. It shows weak link and surplus position of primary structure. Use the parametric design language APDL to establish and analyze finite element model, based on crusher structural features. Make lightweight design meeting the demands of intensity, stiffness and moment of inertia. The result indicates that modified flywheel is less than the original one by 5%, makes structure more reasonable and stress distribution more even.

Abstract: Study on the load exerted on cutter head is very useful for the design and performance prediction of hard rock tunnel boring machines. A composite model based on smoothed particle hydrodynamics and finite element method was carried out using AUTODYN software to study the rock fragmentation mechanism of constant cross-section disk cutters in cutter head. The normal force, rolling force and side force on the disk cutters with different cutter radius were researched in the numerical simulation study. The results were verified by historical literature data. To obtain the distribution of the forces with different cutter radius, the loading of cutter head of a Ф5.75 hard rock tunnel boring machine were analyzed. The result shows that it is useful for cutter head’s design and its layout optimization.