特种越野汽车传动系方案的计算机辅助设计

特种越野汽车的传动系结构复杂 ,是一个动力传递与分配网络 ,其传动方案设计的好坏直接影响整车的越野机动性、动力性、经济性等性能。本文对特种越野汽车传动系的方案设计进行了研究 ,将传动系方案设计分解为拓扑结构设计和参数设计及最佳匹配两个层次 ,通过 PTG图自动生成算法和产品可视化建模技术 ,较好地解决了传动系方案的计算机辅助设计问题。     

汽车传动系统非规则壳体类部件有限元建模

针对传统建模方法下汽车传动系统中非规则壳体部件有限元分析结果不准确的问题,提出一种基于部件简化的有限元新型建模方法。详细给出了轴承、齿轮和紧固件等常用部件的模型简化方法,并以汽车主减速器壳体有限元分析为例,基于有限元软件环境,建立了基于传统建模方法和文中提出方法下的两种有限元分析模型;通过对两种模型的仿真结果对比发现:两种方法下汽车主减速器壳体上应力分布总体趋势相同,但是在安装轴承位置等局部区域应力值相差较大。通过对主减速器在输入扭矩为100 N·m,200 N·m和400 N·m三种工况下壳体应力的测试得知:简化方法建立的模型分析结果更加接近实际数值,从而验证了所提方法的正确性和准确性。     

轮式牵引车传动系扭转自激振动的分析

将牵引车的传动系简化为一个2自由度的扭转振动系统,并以二阶微分方程描述.通过构造内外境界线,基于环域定理证明在满足两个代数不等式的条件下该微分方程必有极限环,从而给出系统产生扭转自激振动的条件.数值计算表明,自激振动的振幅与初始滑转率相关.最后,提出通过增加传动系扭转阻尼来防止在任何初始滑转率下发生剧烈的扭转自激振动的措施.     

汽车传动系相关NVH问题的动力学研究论述

总结汽车传动系相关NVH问题的难点,典型振动、噪声现象的特征及产生机理和国内外研究进展,介绍传动系噪声、振动与声振粗糙度(Noise, vibration and harshness, NVH)动力学问题的主要研究内容及路线。从仿真和试验的角度展开论述：在仿真研究中,详细分析系统动力学、多体动力学、结构动力学模型及系统、结构动力学混合模型的四种传动系力学模型及其各自的特点,总结建模所使用的坐标与坐标系,并针对传动系NVH问题的动力学研究,从定量与定性两个方面总结主要的仿真研究方法;在试验研究中,介绍试验研究的主要内容、数据处理的方法及试验的主、客观评价方法。     

Uncertainty analysis and optimization of automotive driveline torsional vibration with a driveline and rear axle coupled model

The driveline torsional vibration issue is one of the most significant Noise, Vibration and Harshness (NVH) problems, especially in rear-wheel drive vehicles with manual transmission. In this article, a new driveline and rear axle coupled torsional vibration model (DRCTVM) is developed that considers the relationship between the driveline and the rear axle. The experiments show that the DRCTVM can provide much better results than the traditional model. In addition, for the first time, uncertainty theory is introduced to the analysis and optimization of driveline torsional vibration based on the DRCTVM. A truncated normal distribution is used to describe the uncertainty of DRCTVM, which considers both the probability distribution and the bounds of uncertain variables. Furthermore, robustness of the driveline torsional vibration was analysed using the Monte Carlo (MC) process and optimized using the Multi-Island Genetic Algorithm. The optimization results show that the proposed model and method are effective and improve the robustness of driveline torsional vibration performance.     

ZF从设计概念到系列产品的系统供应者

ZF集团在传动系统、转向器和底盘技术方面处于独特的地位,根据这方面特点,我们把各个子公司,组成一个完整的系统,本文将介绍ZF帕骚（Passau）在非公路传动系统和轴系方面处于领先地位的情况。     

Analysis and optimization of clutch judder based on a hybrid uncertain model with random and interval variables

Clutch judder has serious impacts on the noise, vibration and harshness performance. In this article, a simplified dynamic model with nonlinear friction torque is developed to simulate clutch judder, and the stability and dynamic response of the clutch are analysed. The real part of the judder modal eigenvalue, the moment when the clutch enters the stick state and the fluctuation level of the driving part of the clutch are treated as the evaluation indices. An uncertain hybrid model with random and interval variables is used to describe the uncertainty of parameters and a hybrid perturbation vertex method is formulated to compute the uncertainty. Furthermore, parameters with high sensitivities are used as design variables and uncertainty-based optimization is conducted to reduce clutch judder. The optimization results strongly validate that the proposed method is very effective in improving the robustness of the clutch judder performance.     

装载机传动系载荷样本长度的确定

从频率域及幅值域分析出发，将样本长度与统计精度联系起来，用保守谱精度估计公式及近似均值精度估计公式，确定了ＺＬ４０装载机传动系载荷样本长度，为试验方案设计提供了科学依据。     

Look-ahead controls of heavy duty trucks on open roads — six benchmark solutions

A benchmark problem for fuel efficient control of a truck on a given road profile has been formulated and solved. Six different solution strategies utilizing varying degrees of off-line and on-line computations are described and compared. A vehicle model is used to benchmark the solutions on different driving missions. The vehicle model was presented at the IFAC AAC 2016 symposium and is compiled from model components validated in previous research projects. The driving scenario is provided as a road slope profile and a desired trip time. The problem to solve is a combination of engine-, driveline- and vehicle-control while fulfilling demands on emissions, driving time, legislative speed, and engine protections. The strength of this publication is the collection of all six different solutions in one paper. This paper is intended to provide a starting point for practicing engineers or researchers who work with optimal and/or model based vehicle control.     

传动系统管理功能的发展

为了推进产品包括功能的创新,汽车在与过程相关的研究领域内取得了快速发展.这是因为最终用户是否购买取决于新车的价值.问题的实质是汽车必须工作可靠、功能齐全.对于以软件为主的产品,如几乎所有的电子元件或组件,其质量不仅必须通过单独试验,而且还需用可再现的过程加以预确认和预保证.因此,在产品完善前,传动系统产品功能的开发必须包涵各个方面.新开发的基于控制模块的锁止离合器可作为一个实例.