Applied Mechanics and Materials Vols. 300-301

Abstract: A modeling method of parts surface form error distribution by precision turning for assembly is proposed in this paper. Selecting cylindrical surface by turning as the research objective, the study of modeling method of form error distribution law is carried out. According to the data from the precision surface which is measured by coordinate measuring machine (CMM), we model form error using the mathematical and numerical simulation software, followed by studying the form error distribution law of the cylindrical surface by precision turning. Finally, the form error numerical model for assembly is established based on the least square method. All the research above can provide guidance for the precision microminiature parts assembly and the improvement of assembly accuracy of precision parts.

Abstract: Aiming at NC milling processing simulation problem, a ball-end cutter milling force model is established, the numerical simulation analysis of aluminum alloy AL2024 milling process is conducted by using the finite element analysis software AdvantEdge FEM. Focus on the Milling force simulation, the size of the milling force is obtained by simulating calculation. Using the same cutting parameters for milling experiment, the results show that simulation analysis of the cutting force values are in good agreement with the experimental results，the milling force model prior established is correct. The research laid a foundation for the perfect CNC milling simulation system.

Abstract: Web3D can be understood as 3D model displaying for the Internet browser. In the regard of Web3D technology, to name a few, modeling of 3D models, texture mapping of 3D models, interactive design will pose influence on the final on-line displaying. The paper discusses feasibility of Web3D technology development from modeling methods for Web3D models.

Abstract: Abstract. An orthogonal cutting is a symmetric cutting thus it can be modified as a two dimensional cutting. This paper uses quasi-steady molecular statics method to carry out simulation of two dimensional nanoscale cutting copper work piece by the diamond tools. For the two dimensional quasi-steady molecular statics nanoscale cutting model used by this paper, when the cutting tool moves on a copper work piece, displacement of atoms is caused due to the effects of potential on each other. After a small distance that each atom moves is directly solved by the calculated trajectory of each atom, the concept of force balance is used. The minimum energy method is employed to carry out the search, and obtain the new movement position for each atom. Based on the simulation results, this paper studies the chip formation shape and cutting forces in x direction and y direction.

Abstract: A unique linear engine system is designed independently using eccentric-slider starting system which has been simulated and optimized. Based on the linear engine prototype, the no-load experiment and normal starting experiment are conducted in order to validate the practicality of the eccentric-slider starting system and research the starting characteristics of the linear engine system. The results show that the linear engine can operate smoothly with the starting system under the control logic based on piston displacement and engine frequency. Meanwhile the top cylinder pressure is 1.0MPa in compression process and the engine speed increase continuously with the peak combustion cylinder pressure above 2.0MPa in the normal starting experiment.

Abstract: This paper introduces a new method for the communication between human and product model entity definition processes. As product definition is moving into modeling in industrial product lifecycle management (PLM) systems, and built-in knowledge and intelligent computing content of product models increase, development of product modeling faces new challenges. More often, knowledge content is not in accordance with authorized human intent and different intents of different authorized humans for the same task are not in harmony. At the same time, authorized human needs help to understand decisions of other humans at application and modification of existing entity definitions in product model. The authors of this paper found the answer for the above challenges in a new human-model generation communication which extends the conventional product feature definition to higher level definition of objectives and allows for harmonizing different human intents. This communication applies higher level connection of human and product object generation process by knowledge based contextual chain in which model entities are more appropriate for knowledge content based decisions as the currently applied knowledge ware features. The proposed communication is devoted as extension to currently applied one so that the new decision assistance can be integrated with the well proven feature driven current industrial modeling.

Abstract: The topology optimization design problem with multiple constraints for the complex vertical tail structure is studied in this paper. The variable density structural topology optimization method is improved by introducing a constraint factor. According to the different structural constraints and design requirements, variable factors and element pseudo density are initialized via finite element method. This method is controlled by the constraint factors, and the improved method combining with Rational Approximation of Material Properties (RAMP) density-stiffness interpolation model with optimality criteria methods (OC), the vertical tail’s stiffness optimization has been finished. The density-stiffness interpolation model, the mathematical model of variable density method with constraint factor, the structural optimization model, the solution model of the OC method, the design variables iterative format, are given in this paper and the algorithm with Matlab program is realized. Lastly, a sample vertical tail case is introduced to validate the feasibility of the algorithm by operating the results and analyzing the data.

Abstract: Energy consumption of fluid machinery, especially for canned motor pump that rotates in water, increases sharply as radius or speed increases. It not only leads to low efficiency of the pump, but also probably suppresses heat transfer between stator winding and water. According to researches on Taylor-Couette flow, dimensionless torque decreases obviously when both cylinders rotate in certain speed ratio. It inspires us to propose a structural design to realizing drag reduction in Taylor-Couette flow system, which has simple structure but huge potential.

Abstract: The double mass model of valve mechanism for type 16 VPA6STC diesel engine is established in this paper. The results of vibration characteristic simulation analysis based on AMESim show that the valve mechanism has rich nonlinear vibration characteristics. The kinematic and dynamic characteristics of the simulation model for the valve mechanism provide the reference for evaluation various performance of the valve mechanism comprehensively and systematically.

Abstract: Junction box is an important part of cabled seafloor observatory. And it should be deployed to correct position safely, smoothly and precisely. A model of virtual prototype simulation is put forward in this paper to analyze the dynamic characteristics of the deployment process in Marine Environment. The analysis is focus on the influence of different sea condition and different vibrating movement of ship caused by the wave, as well as the some important deploying parameters during the deployment process. The preliminary results of the simulation with ADAMS software provides scientific support for deployment system designers and operators to refer to.