Coupled vibration analysis of Maglev vehicle-guideway while standing still or moving at low speeds

Dynamic instability, that is, resonance, may occur on an electromagnetic suspension-type Maglev that runs over the elevated guideway, particularly at very low speeds, due to the flexibility of the guideway. An analysis of the dynamic interaction between the vehicle and guideway is required at the design stage to investigate such instability, setting slender guideway in design direction for reducing construction costs. In addition, it is essential to design an effective control algorithm to solve the problem of instability. In this article, a more detailed model for the dynamic interaction of vehicle/guideway is proposed. The proposed model incorporates a 3D full vehicle model based on virtual prototyping, flexible guideway by a modal superposition method and levitation electromagnets including feedback controller into an integrated model. By applying the proposed model to an urban Maglev vehicle newly developed for commercial application, an analysis of the instability phenomenon and an investigation of air gap control performance are carried out through a simulation.     

Real-time model predictive control of connected electric vehicles

ABSTRACT

Electric Vehicles (EVs) motors develop high torque at low speeds, resulting in a high rate of acceleration with the added advantage of being fitted with smaller gearboxes. However, a rapid rise of torque in EVs fitted with central drive powertrains can create undesired torsional oscillations, which are influenced by wheel slip and flexibility in the halfshaft. These torsional oscillations in the halfshaft lead to longitudinal oscillations in the vehicle, thus creating problems with regard to comfort and drivability. The significance of using wheel slip in addition to halfshaft torsion for design of anti-jerk controllers for EVs has already been highlighted in our previous research. In this research, we have designed a look-ahead model predictive controller (LA-MPC) that calculates the required motor torque demand to meet the dual objectives of increased traction and anti-jerk control. The designed LA-MPC will improve drivability and energy consumption in connected EVs. The real-time capability of the LA-MPC has been demonstrated through hardware-in-the-loop experiments. The performance of the LA-MPC has been compared to other controllers presented in the literature. A validated high-fidelity longitudinal-dynamics model of the Rav4EV, which is the test vehicle of our research has been used to evaluate the controller.     

基于计算机自动控制技术的多探头测深系统研制与改造

通过加装控制盒的方式,实现单探头测深仪与自动控制探头之间的流畅切换,将传统单探头测深仪改造成具有多探头功能的高效水下测量仪器系统,主要用于航道和码头基床等的水下扫测。利用该系统进行的码头基床扫测已经取得成功,可为同类测量设备的改造提供全新的思路。     

基于CBTC控制的全自动驾驶系统

主要介绍全自动驾驶(FAO)系统的发展和应用情况、系统的组成和特点,并提出引进采用该系统需要注意的问题。     

CJBW10舰船微机监控报警系统

介绍一种新型的舰船用微机监控报警系统，该系统采用先进的微机网络技术和单片机技术，将高分辩率彩色ＣＲＴ测点参数和图形显示功能，报警灯板板功能和记录打印功能以及控制功能集于一块单板上，并通过网络与测量单元相闻，既可在网络型船舶自动化系统中作这联网的机舱监控报     

多变量解耦法在舰用锅炉—汽轮机协调控制中的应用与研究

针对舰用蒸汽动力装置的特点，根据热工动态原理，建立锅炉－汽轮机动态数学模型，应用多变量控制理论中的单向解耦法和多变量频域解耦设计法，将多变 量控制系统化解为为量控制系统，进行协调控制方案研究，给出协调控制系统设计的方法，并用参数优化方法获得了协调控制器参数，仿真运行结果表明，协调控制系统优于常规的ＰＩＤ控制系统。     

基于ADSP-BF533的网络音视频监视系统

主要介绍ADSP-BF533的基本特征，并提出了一种基于ADSP-BF533的具有体积小、成本低等特点的网络视频监视系统的软件和硬件设计方案。     

连续箱梁混凝土结构裂缝的施工控制

结合立交箱梁施工实践,介绍箱梁结构裂缝的施工控制措施。     

武汉军山长江公路大桥B标主桥钢箱梁安装及斜拉索张挂施工

文章主要介绍了武汉军山长江公路大桥B标主桥钢箱梁安装及斜拉索张挂的施工过程及方法，同时对主桥的施工监控进行了叙述。     

水下机器人递阶控制系统结构设计

为了简化水下机器人的控制系统设计,实现良好的人机界面,本文提出了解耦三级递阶控制系统结构,它包括由任务脚本和任务解释器组成的任务级控制、位置／姿态级控制和执行级控制。采用这种控制结构,大大缩短了开发周期,提高了软件模块的可重用性。