板料成形中等效拉延筋阻力的模拟计算方法

提出了一种综合考虑多种因素影响的等效拉延筋阻力的模拟计算方法,编制了相应的计算程序。在该方法中,采用平面应变假设,针对不同的材料类型,选用不同的屈服准则,考虑了Bausch inger效应、应变速率敏感性、板料变形过程中板厚的变化以及中性层偏移等多种因素对拉延筋阻力的影响。通过与经典的N ine试验数据进行比较,验证了该方法的有效性。     

特种条件下运载工具乘员保护装置管式安全气囊与护颈器仿真计算研究

围绕特种条件下运载工具碰撞中的乘员保护装置开展仿真计算研究。所涉及的特种条件包括地面和水面运载工具的高速复杂碰撞以及航天运载工具着陆时的复杂碰撞条件,同时也包括对乘员保护装置的质量限制、防爆性能要求和环保性能要求等。根据工程实际的需要,对所发明的复合式高性能安全气囊和复合结构护颈器这两项特殊的乘员保护装置进行了仿真建模、仿真分析和参数优化。仿真研究表明所提出的技术方案能在给定的特种碰撞条件下对乘员提供有效的保护。     

基于ADAMS的大型客车空气弹簧前悬架仿真分析与比较

利用虚拟样机技术,在ADAMS软件环境下建立了ZF、DANA和SCANIA3种大型客车空气弹簧前独立悬架的多体运动学计算模型,并进行了刚体运动学和弹性体运动学仿真分析研究。在车轮跳动条件下对这3种大型客车空气弹簧前悬架定位参数的变化规律进行了比较研究,并对后两者的前束角进行了优化设计,为同类型空气弹簧前悬架系统设计提供了参考。     

纯电动轻型载货车电驱桥参数匹配及仿真分析

为了满足未来2年单位载质量能量消耗量(Ekg)的要求,目标电动轻型载货车采用更高效的电驱桥系统方案取代现有电机直驱方案,并运用一系列轻量化技术方案降低整车整备质量,开发经济性和动力性更有竞争力的目标产品。首先根据整车技术要求匹配电驱桥系统,并通过CRUISE仿真分析进一步优化电驱桥系统方案。     

基于免疫算法的汽车主动悬架控制研究

应用免疫算法理论,以车身垂直加速度、悬架动行程和车轮动载为控制目标,设计了基于汽车1/4模型的主动悬架控制策略。该算法利用信息熵作为评价抗体亲和力的指标,具有多样识别能力、强鲁棒性和免疫记忆功能。仿真结果表明,基于免疫控制器的主动悬架对汽车的平顺性和操纵稳定性有较明显的改善。     

金属带式无级变速传动速比变化特性研究

通过实验方法分析了无级变速传动的动态响应，提出了获取无级变速传动速比变化率的途径，导出了实用的速比变化率计算公式。通过实验验证了理论分析的正确性。应用该公式进行仿真研究，理论计算结果与实验结果具有良好的一致性。研究表明，文中给出的速比变化率计算模型是可行和有效的，具有实用价值。     

电动助力转向系统回正控制算法研究

提出了一种电动助力转向系统回正控制算法以提高转向盘的回正性。开发了一种基于转向盘转角估计的PID控制算法，该控制算法不需要转向盘转角或者电动机转速传感器，降低了控制系统的成本。同时，对提出的控制算法进行了仿真，并与其它回正控制算法的试验进行对比，结果证实此算法可提高转向盘的回正性和稳定性。     

Bottom effects on the tower base shear forces and bending moments of a shallow water offshore wind turbine

In this paper the tower base shear forces and bending moments of a shallow water offshore wind turbine have been rigorously calculated by using a nonlinear simulation method taking into account the bottom effects. It has been found that nonlinearly simulated realistic waves with bottom effects should be used as inputs in the stochastic time domain simulation in order to design an un-conservative support structure for the offshore wind turbine. In order to further improve the simulation efficiency, a transformed linear simulation method has been utilized in this paper for generating equivalent waves as those obtained from the nonlinear simulation method. The accuracy and efficiency of the transformed linear simulation method have been convincingly substantiated through the subsequent calculation examples in this article.     

Powertrain technologies and their impact on greenhouse gas emissions in key car markets

The role alternative car technologies may play in effectively tackling the problem of climate change is still highly uncertain. This paper aims at investigating possible impacts of car powertrain technologies on future energy demand and its corresponding greenhouse gas emissions until 2030. A system dynamics model covering nine car technologies in China, France, Germany, India, Japan and the United States was applied, with a focus on electric cars. Four main scenarios are constructed and sensitivity analysis undertaken. Greenhouse gas emissions from cars in the six countries are simulated to reach up to 2.6 gigatonnes in 2030 (a 13–32% increase between 2020 and 2030, depending on the scenario). The main conclusion from model-based policy analysis is that electric cars may have a positive contribution to emissions mitigation in the passenger road transport system. However, greenhouse gas emissions from cars arising from the combined effect of car manufacturing and scrappage and electricity generation processes are expected to grow more dramatically. As a result, actions that support both low-emission (re-)manufacturing and clean electricity generation are needed. These results complement accurate but static life cycle assessments and open the discussion for dynamic model assumptions.     

EGS2200电子调速系统建模与仿真研究

EGS2200电子调速系统是Lyngso Marine公司研制的电子调速系统，该系统具备了控制稳定、性能优越、安全可靠等特点，已经和DGS8800电子调速器系统一样被广泛地装配在大型商船的主机系统中。本文对EGS2200电子调速系统进行建模并分别对柴油机转速、扫气压力、柴油机的功率、柴油机的油门等参数利用VC++进行实时仿真和界面设计，利用仿真数据对模型进行修改和完善，最后开发出一套符合船员智能训练和考试的系统。