【摘 要】
：
Sound parameters of psychological subject evaluation in the car are measured and calculated on electric car with low speed,using neural network(NN)method forecasting model on sound quality is built an
【机 构】
：
College of Automobile and Transportation,Tianjin University of Technology and Education;National Joi
论文部分内容阅读
Sound parameters of psychological subject evaluation in the car are measured and calculated on electric car with low speed,using neural network(NN)method forecasting model on sound quality is built and model parameters affecting calculation accuracy and efficiency is researched.All relative errors of prediction using NN method are smaller,and they are no more than 9.00# and changing curve of relative error is flat,and that learning rate in the range of 0.40 to 0.80,and implying layer number of 4,7,11 and 13 and accelerating rate from 0.10 to 0.85 is well available.Recycling times and relative error has regular with the increase of learning rate,and they change just like shapes of saw tooth with the increase of implying layer number,and recycling times begin to decrease slowly and then rise steeply with the increase of accelerating rate,and relative error decreases at the beginning with the increase of accelerating rate and then rises.The forecasting model is applied to some type electric car,and it is found that the one-cylinder engine of the increasing program electric car is the most contribution source and development effect is very good.
其他文献
为研究曲轴前端隔振解耦器低速段的隔离效果，基于振动理论推导出了曲轴隔振器隔离率的表达式，建立了完整的隔离率简易计算模型，并与CAE仿真软件计算得到的结果和发动机台架实测结果进行对比，验证了该方法的有效性和实用性。
为解决某前置前驱乘用车加速中出现的变速器齿轮敲击噪声问题，本文建立了整车动力传动系统扭转振动仿真模型，并对影响传动系统共振频率和响应幅值的关键参数进行敏感性分析。结果表明，离合器的扭转刚度和阻尼是影响传动系统扭转共振模态及响应幅值的关键参数。选择合理的离合器扭转刚度和阻尼，能够有效降低传动系统的扭转振动，改善变速器齿轮敲击噪声。本文对优化分析提出的改善方案进行了样件试制和实车验证，验证结果表明改善
本文针对某乘用车双尾管排气系统降噪性能较差问题进行了优化设计。通过构建排气系统与发动机工作过程的耦合分析模型，获得了排气尾管噪声及其阶次分布。基于一维和三维计算流体动力学方法获得了排气系统各部件的压力分布，重点解决了消声器中穿孔板的网格划分和简化方法。基于分析结果对消声器结构进行优化设计，通过控制消声器中插入管直径、穿孔管开孔位置、穿孔板开孔方式等优化了声学性能，降低了排气背压。在整个转速范围内，
Unmanned vehicles have become the important direction of vehicle development,and the trajectory tracking is an important part of the large closed-loop system of unmanned vehicles,the control effect of
End to end motion control is a new paradigm for mobile robots,it maps sensors output to motion control commands directly.In this paper,an approach to end to end control based on a 2D laser range finde
In this paper,a novel robust detection with low-height objects approach using sparse lasers is proposed.The detection method is consisting of RANSAC and cluster to process 3D point clouds.In RANSAC,it
绿色机动化是人、车以及交通之间的理性发展关系，是建设绿色生态城巿不可或缺的重要内容。本文针对中国城巿绿色机动化评价体系的指标展开研究，应用德尔菲法获得一定数量的专家咨询结果，通过yaahp软件计算得到各个评价指标所占权重，依据概率论与数理统计的原理对指标进行筛选，优化评价指标体系，并对部分影响城巿绿色机动化的指标因素进行分析。本文的研究为中国城巿绿色机动化的研究方法奠定了一定基础，为城巿绿色机动化
建立某车型前围钣金件隔声量预测模型，并进行仿真试验对标，分析不同预测方法，得到较高精度的仿真模型。通过分析模型精度的影响因素可知，模态密度对模型精度影响较小，内损耗因子的影响较大。加强板的四种建模方式均可保证模型精度，但等效厚度法效率最高。采用混合FE+SEA法可大幅提高中频段的预测精度，可有效应用于前围钣金件等小规模模型中。
本文采用阶次分析推断出变速器与整车加速啸叫的相关性，提出了变速器台架异响再现试验方法，使啸叫问题在变速器台架上复现，在此基础上提出限制变速器啸叫问题的关键参数。通过增加一对相关齿轮的齿数，使变速器啸叫问题的关键参数满足要求，同时通过整车试验验证，啸叫消失。
分析了汽车排气口装饰件的腐蚀环境,对比了SUS 304 和SUS 316L两种材料的化学成分、电极电位、耐蚀性(中性盐雾)、焊后腐蚀特性、材料成型性、耐整车强化腐蚀试验等性能特征。分析结果显示,SUS 316L 比SUS 304更适合在汽车后排气口装饰件上使用。