NAM流程体系在汽车造型设计中的应用

汽车造型设计是一项重要、复杂且繁重的工作。本文首先简要叙述了安徽江淮汽车公司自主研发的NAM(Now And Me)流程体系的基本概念和结构。接着,基于NAM流程体系的指导思想,将汽车造型设计细分为四个阶段、7个关键节点。最后,以江淮汽车为例,详细阐述了汽车造型设计完整过程中的步骤、关键节点和注意事项等。以此说明NAM流程体系是一种从概念到产品的研发流程管理技术,具有普适性和推广性,可延伸到其他行业用于指导多种工业设计过程。

汽车造型设计流程及其在电动汽车设计领域的应用

事实证明,通过重视前期调研、重视细节推敲、灵活运用模型技术、充分发挥计算机作用、重视工程分析、重视平台化设计等一系列手段,完全可以将纯电动汽车造型设计时间和成本进一步压缩。

商用车造型创意设计方法与实践

文章通过对家族化造型设计的探讨工作,发现创意设计在方案设计阶段具有突出的重要性。此外,在造型过程中创意设计方法,比如前期预研、创意草图、效果图设计、CAS曲面设计、A面设计等对最终造型方案的品质具有相当大的影响,也最终会对设计活动的有效性与顺畅度产生决定性影响,也是提高产品品质的有效实践途径。最后,通过实际项目对创意设计阶段进行了概述与总结。

Smoothed particle hydrodynamics modeling and simulation of foundry filling process

A numerical model of foundry filling process was established based on the smoothed particle hydrodynamics（SPH）method.To mimic the constraints that the solid mold prescribes on the filling fluid,a composite treatment to the solid boundaries is elaborately designed.On solid boundary surfaces,boundary particles were set,which exert Lennard-Jones force on approaching fluid particles;inside the solid mold,ghost particles were arranged to complete the compact domain of near-boundary fluid particles.Water analog experiments were conducted in parallel with the model simulations.Very good agreement between experimental and simulation results demonstrates the success of model development.

A Dynamic Modeling For Cyclic Total Reflux Batch Distillation

Cyclic total reflux(CTR) batch distillation is a promising mode of the process but lacking of appropriate modeling for the period of filling the reflux drum.A new dynamic modeling method for the simulation of CTR batch distillation is proposed in this work,in which the changes in column holdup and liquid flow rate during the filling of the drum,and the consequent change in valid number of theoretical plates are considered.The effect of drum holdup on operation time is investigated and the optimal drum holdup is obtained from the simulation.The dynamic modeling is compared to the conventional modeling without consideration of change in liquid flow rate. The experimental result shows that the present modeling is more reliable and more accurate,especially for the column with large liquid holdup.

Integrated reliability of travel time and capacity of urban road network under ice and snowfall conditions

In order to evaluate and integrate travel time reliability and capacity reliability of a road network subjected to ice and snowfall conditions,the conceptions of travel time reliability and capacity reliability were defined under special conditions.The link travel time model(ice and snowfall based-bureau public road,ISB-BPR) and the path choice decision model(elastic demand user equilibrium,EDUE) were proposed.The integrated reliability was defined and the model was set up.Monte Carlo simulation was used to calculate the model and a numerical example was provided to demonstrate the application of the model and efficiency of the solution algorithm.The results show that the intensity of ice and snowfall,the traffic demand and supply,and the requirements for level of service(LOS) have great influence on the reliability of a road network.For example,the reliability drops from 65% to 5% when the traffic demand increases by 30%.The comprehensive performance index may be used for network planning,design and maintenance.

CFD study of turbulent jet impingement on curved surface

The heat transfer and flow characteristics of air jet impingement on a curved surface are investigated with computational fluid dynamics(CFD)approach.The first applied model is a one-equation SGS model for large eddy simulation(LES)and the second one is the SST-SAS hybrid RANS-LES.These models are utilized to study the flow physics in impinging process on a curved surface for different jet-to-surface(h/B)distances at two Reynolds numbers namely,2960 and 4740 based on the jet exit velocity(U_e)and the hydraulic diameter(2B).The predictions are compared with the experimental data in the literature and also the results from RANS k-εmodel.Comparisons show that both models can produce relatively good results.However,one-equation model(OEM)produced more accurate results especially at impingement region at lower jet-to-surface distances.In terms of heat transfer,the OEM also predicted better at different jet-to-surface spacings.It is also observed that both models show similar performance at higher h/B ratios.