对双层客车侧门改造方案的分析

简单介绍了25型双层客车侧门改造方案，通过计算和分析，证明改造方案可行，能满足北方地区的运用要求。     

A novel direct yaw moment controller for in-wheel motor electric vehicles

A novel direct yaw moment controller is developed in this paper. A hierarchical control architecture is adopted in the controller design. In the upper controller, a driver model and a vehicle model are used to obtain the driver's intention and the vehicle states, respectively. The upper controller determines the desired yaw moment by means of sliding mode control. The lower controller distributes differential longitudinal forces according to the desired yaw moment. A nonlinear tyre model, ‘UniTire’, is utilised to develop the novel distribution strategy and the control boundary.     

广州地铁3号线列车车门控制器离线检测装置的设计与应用

地铁列车车门控制器是运营部门日常检修维护的重点。介绍了车门控制器离线检测装置的结构及其核心部件的工作原理。以开门为例,详细描述了检测装置的自动检测流程和故障检测方法。检测装置可离线检测,这提高了车门控制器部件的工作质量和效率,消除了装车检测的风险,保障了车辆运营服务品质,节约了因专门向供应商订制检测装置所产生的高额成本及后续维护费用。     

基于滑模自抗扰的电制动系统动态负载模拟

为精准模拟传动系弹性及齿隙作用下电制动系统非线性机械负载,提出了自适应模糊滑模自抗扰的测功机控制算法。首先,针对一款前驱电动汽车,建立融合感应电机模型的车辆及台架机电一体化模型,引入典型正常制动和防抱死制动控制作为测试对象。其次,构建扩张状态观测器估计台架系统未建模动态,以自适应模糊滑模控制测功机实时模拟高度非线性机械负载。最后,开展了制动控制策略台架测试的仿真研究。结果表明:提出的方法可精确模拟电制动系统动态负载,有效提高制动控制算法台架测试精度。     

Transient switching control strategy from regenerative braking to anti-lock braking with a semi-brake-by-wire system

Regenerative braking is an important technology in improving fuel economy of an electric vehicle (EV). However, additional motor braking will change the dynamic characteristics of the vehicle, leading to braking instability, especially when the anti-lock braking system (ABS) is triggered. In this paper, a novel semi-brake-by-wire system, without the use of a pedal simulator and fail-safe device, is proposed. In order to compensate for the hysteretic characteristics of the designed brake system while ensure braking reliability and fuel economy when the ABS is triggered, a novel switching compensation control strategy using sliding mode control is brought forward. The proposed strategy converts the complex coupling braking process into independent control of hydraulic braking and regenerative braking, through which a balance between braking performance, braking reliability, braking safety and fuel economy is achieved. Simulation results show that the proposed strategy is effective and adaptable in different road conditions while the large wheel slip rate is triggered during a regenerative braking course. The research provides a new possibility of low-cost equipment and better control performance for the regenerative braking in the EV and the hybrid EV.     

安全风险评估在煤系易滑地层边坡综合整治后的应用

结合地质调绘、边坡病害调查和监测成果,对综合整治后的煤系易滑地层边坡-以清云高速公路地豆服务区AK0+353~AK0+513右侧路堑边坡为例,进行安全风险评估(包括适宜性评价、稳定性评价和安全风险评价),划分安全风险等级并提出适宜的应对措施,为高速公路的安全运营管理提供基础依据。     

船坞卧倒门安装工艺与实践

中船龙穴造船基地修船项目1号、2号船坞工程坞门为卧倒式结构,文章对这种坞门的安装工艺及实践作了介绍。     

Sliding mode-based lateral vehicle dynamics control using tyre force measurements

In this work, a lateral vehicle dynamics control based on tyre force measurements is proposed. Most of the lateral vehicle dynamics control schemes are based on yaw rate whereas tyre forces are the most important variables in vehicle dynamics as tyres are the only contact points between the vehicle and road. In the proposed method, active front steering is employed to uniformly distribute the required lateral force among the front left and right tyres. The force distribution is quantified through the tyre utilisation coefficients. In order to address the nonlinearities and uncertainties of the vehicle model, a gain scheduling sliding-mode control technique is used. In addition to stabilising the lateral dynamics, the proposed controller is able to maintain maximum lateral acceleration. The proposed method is tested and validated on a multi-body vehicle simulator.     

地铁站台屏蔽门系统结构测试方法

综合分析国内外屏蔽门系统结构仿真分析方法的现状和发展水平,提出一种通过均布点荷载模拟等效面载荷的结构测试方法,并在工程样机上进行实例验证。仿真分析及实例验证表明,该测试方法满足行业标准的技术要求。     

汽车滑移门典型关门驱动力构建的研究

为给滑移门导向系统动力学特性研究提供可靠的输入数据,基于某车型滑移门关门力试验数据,进行汽车滑移门典型关门驱动力的构建。首先从3种关门工况下的大量实测关门力曲线中提取出10个特征参数,运用PauTa法则剔除异常数据。在此基础上,利用马尔可夫链方法构建典型的关门驱动力,并将其曲线拟合成STEP函数以便于在工程上实现驱动力的加载。最后,将特征参数的拟合前后数据与其试验数据平均值进行比较,以验证所用方法的有效性,结果表明两者的相对误差均在10%以内,说明此构建方法有效可行。