基于转向盘转角的疲劳驾驶检测方法研究

为监测驾驶人员的疲劳驾驶行为,提出了基于转向盘转角的疲劳驾驶检测方法。该方法利用角度传感器MLX90316采集转向盘转角数据,并从采集的转角数据中提取出了能描述驾驶员疲劳状态的角度标准差和静止百分比,根据角度标准差和静止百分比建立疲劳状态判别模型对驾驶员疲劳状态进行检测。实车试验表明,该方法能够简单、快捷地判断驾驶员的疲劳状态,准确率达到80.3%。     

Rollover detection and control on the non-driven axles of trucks based on pulsed braking excitation

The major challenges for rollover detection are the accurate modelling of vehicle dynamics and the real-time estimation of the varied parameters. To circumvent the dependence on vehicle parameters, a novel rollover detection method based on the pulsed braking excitation is proposed. With the lateral load transfer ratio (LTR), the relationship between rollover risks and non-driven wheel rotational dynamics is deduced, which is the basis to apply braking excitation on wheels. The lateral acceleration is adopted as the first criterion to activate the rollover detection. Once the pulsed braking is applied to the non-driven wheels, the braking pressure and wheel angular speeds are measured to estimate the LTR on the non-driven axle. In case of emergency, the differential braking-based anti-rollover is implemented. Experiments were conducted on a Hardware-in-Loop bench. The results show that, the pulsed braking can be activated timely, and the LTR on the non-driven axle is estimated accurately. With the anti-rollover control, the roll stability is improved considerably.     

阶梯式基础地基应力计算

通过对刚体理论下地基应力计算方法的分析研究,在其基本假定的基础上,推出了条形基础的竖直基底压力和水平基底压力的计算公式;作为通用解法,有使倾斜偏心荷载作用下,阶梯式基础的地基应力的计算更加简便,并与规范配套的特点。     

客车CAN总线简介及应用

简要介绍CAN总线的发展历程,CAN总线在客车中的应用。     

盘锦市普通公路工程招标投标报价策略研究

本文分析了盘锦市普通公路工程造价构成的特点,提出了投标报价的可行策略,为投标单位确定有竞争力的投标报价提供了指导意见。     

浅谈顶盖横梁拼焊工艺优化及其模块化定位的工作方法

本文通过对产销量大的低配车型顶盖合拼的工艺优化,对前横梁、中横梁和后横梁的上件工艺方案及其定位夹具优化,开发新一代中横梁、后横梁的定位夹具,将中横梁、前横梁等零件的定位方法模块化,形成一种整体解决方案,具有较高的应用推广价值。     

二维截面法在精确预测汽车梁类件回弹上的应用

三维零件回弹结果的精确预测一直是个难题,文中把二维截面法应用到对三维零件回弹管预测和补偿上,离散整个三维零件为各个特征截面,通过二维截面法和有限元软件LS-DYNA精确地对汽车纵梁回弹和补偿进行了预测计算,实践证明。通过两次的回弹预测和补偿计算,汽车纵梁补偿后的回弹结果和实际产品形状相比,误差在0．5mm以内,有很好的实用价值。     

起动用免维护铅酸蓄电池使用与保养维护

介绍了起动用铅酸蓄电池的养护一般要求,分析影响蓄电池亏电的因素,并介绍了两种不同的蓄电池补电方法及注意事项。为蓄电池的使用及保养维护提供理论和现实依据。     

公路隧道火烧应急检测

火烧是目前公路隧道常见事故之一, 由于隧道结构狭长、 空间小、 通风条件差等特点一直是应急检测的难点。 文章以火场温度分析为基础, 依托实际工程, 阐明火烧应急检测内容, 为养护决策提供依据。     

Numerical method of electromagnetic pulse response of conductor with complex load北大核心CSCD

[Objectives]Electromagnetic pulse can seriously affect and even destroy naval shipborne electronic information systems, weapons, equipment and so on. Due to the complexity of the antenna port load circuit, it is necessary to formulate a numerical method which can easily obtain the antenna load current. [Methods]The induced current of the terminal is obtained on the basis of the finite-difference time-domain (FDTD) and Holland model. According to the Thévenin equivalent circuit, the conductor is equivalent to the voltage source to realize decoupling between the conductor and load end, and the load circuit is solved using Simulink software.[Results]Compared with the traditional terminal model, this method is simple and feasible for high-order circuit processing. The effectiveness of the model is verified using non-linear elements and parallel capacitors and resistors as the load respectively. The results show that the calculation results of this method are consistent with those of the traditional methods. Finally, the antenna of the end-connected protect- or is calculated. The results show that the lead inductance caused by the installation of the protector is an important factor affecting the protection performance.[Conclusions]The method proposed in this paper can greatly reduce the simulation complexity of the coupling current of an antenna with a complex load, giving it useful reference value for the field of ship electromagnetic pulse protection design. © 2023 Editorial Department of Chinese Journal of Ship Research. All Rights Reserved.