基于Fluent的矿用自卸车平顺性分析与优化  

Mining dump truck's ride-comfort analysis and optimization based on Fluent software

作　　者：董志军[1] 谷正气[1,2] 张沙[1] 徐亚[1] 

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,长沙410082 [2]湖南工业大学,株洲412007

出　　处：《振动与冲击》2014年第15期206-211,共6页Journal of Vibration and Shock

基　　金：国家高技术研究发展计划(863计划)(2012AA041805);交通运输部新世纪十百千人才培养项目(20120222)

摘　　要：矿用自卸车工作路况复杂多变,严重影响了整车平顺性。悬架是影响汽车行驶平顺性的主要部件,首先运用动网格和VOF技术,在Fluent中模拟了油气悬架拉伸和压缩两种工作状态下的内部流场情况,进而计算得到其刚度和阻尼力学特性。同时,在Matlab/Simulink环境下建立了八自由度的整车动力学模型,将所求悬架力学特性应用到整车平顺性仿真中。通过仿真与试验对比得到座椅垂直加速度响应最大误差为9.72%,验证了所得油气悬架力学特性的合理性。最后,采用遗传算法对悬架参数进行优化,座椅垂直加权加速度均方根值下降了21.43%,有效提高了矿用自卸车的平顺性。The road conditions for mining dump trucks are complicated,they affect the vehicle ride-comfort seriously. Suspension is a major part to affect the vehicle ride-comfort. Here,the internal flow field of a hydro-pneumatic suspension under tensile and compression conditions was simulated in Fluent environment with dynamic mesh and VOF techniques. Its stiffness and damping features were calculated afterwards. Meanwhile,a vehicle dynamic model with 8-DOF was established with Matlab /Simulink,the acquired mechanical properties of the suspension were applied in the simulation of the vehicle ride-comfort. From the comparison between the simulation results and test data,it was shown that the maximum error of the seat vertical acceleration is 9. 72%. The fact verified the reasonableness of the mechanical properties of the hydro-pneumatic suspension. At last,the physical parameters of the hydro-pneumatic suspension were optimized using the genetic algorithm. The root mean square of the seat vertical acceleration was reduced by 21. 43%.After optimization,the dump truck＇s ride-comfort was improved obviously.

关 键 词：油气悬架 FLUENT 遗传算法 平顺性 矿用自卸车 

分 类 号：TD57[矿业工程—矿山机电]