商用车对开路面制动评价指标探讨

文中作者依据ISO16234-2006试验方法开展试验并对试验数据进行分析,发现其对变量横摆角速度的处理结果比较离散、一致性程度低,作者结合多年客观测量和主观评价经验,对横摆角速度的变化过程进行分析,增加了横摆角速度响应时间、初始横摆角加速度、航向角的偏离变化等指标,利用并使处理后的指标与数据之间有较高的相关性程度高。     

车身侧倾时前轮主销后倾角对转向稳定性的影响

为了提高4×4越野车弯道高速行驶的稳定性,计及前轮定位参数的影响,建立了转向行驶时整车4自由度动力学模型;计算了车辆在不同车速下,不同前轮主销后倾角时的横摆角速度瞬态响应.结果表明,车速提高时,横摆角速度超调量增大,稳定时间延长;而在适当范围内增大主销后倾角,可减小横摆角速度超调量和稳定时间,改善高速行驶车辆的转向稳定性.同时说明主销后倾角对横摆角速度超调量有阻尼作用.     

ESP传感器工作原理与使用维护（二）

1.3 转向盘转角速度传感器工作参数和工作原理 转向盘转角速度传感器安装在转向盘内侧（图11）。 （1）转向盘转角速度传感器（光电式）的工作参数。该传感器的输出脉冲数量为45个脉冲／1周（一个脉冲周期为8°），输出信号占空比为50％±10％；电源电压为9V-16V；     

车辆液力减速制动器设计和试验研究

研究了液力减速制动器循环圆腔室内油液流动的内特性，建立了用于内特性计算的数学模型；对液力减速器空气鼓风损失进行了研究。在此基础上，设计出采用新的减损结构措施的液力减速制动器样机。并进行了相应的台架试验。结果表明，液力制动力矩的理论设计值与试验值接近；减小液力减速器空转鼓风损失的结构措施具有理想的效果。     

汽车动力学稳定性控制仿真研究

电子稳定性程序 ( ESP)是继 ABS、TCS等系统之后汽车动力学稳定性控制主动安全技术的进一步发展。本文在ADAMS/ CAR中建立整车虚拟样机模型 ,对 ESP进行仿真研究 ,采用质心侧偏角估计期望横摆角速度的边界。仿真结果显示 ESP改善车辆动力学稳定性的有效性。     

动力调谐陀螺仪漂移测试与补偿系统设计

动力调谐陀螺仪在舰船导航中仍占较大比重。为了测试动力调谐陀螺仪的性能，采用DSP设计了一套漂移数据采集与补偿的实验系统。可采用不同的数学模型算法在DSP中对数据进行实时运算，输出相应的控制信号对陀螺仪进行实时补偿。该系统既适用于陀螺仪漂移数据的采集，也可应用于对不同数学模型进行实时补偿的效果进行对比研究。     

Analysis of signal-obtaining error factor of sensor in gyro

The digital signal-obtaining for gyroscope is given. The single optic-fiber sensor via modulating intensity of light is used as measuring eonlponent . The influence on static transmission properties resulting from the special working environnlent （e. g. cryogenic and vacuum） ,the measure error because of tile reflector shape of rotor,the abnormity of facula from sensor caused by the existence of engraving error,and tile fixing error of sensor and the error of machine tool＇s initial lignnlent are investigated. The mathematic model in every condition is founded, the simulation and relative experiments ale done and the outeome is analyzed. The mathematic model and method of compensating technology are studied and some relative experiments are made. The result of study is usefid to improvement of the signal-obtaining system.     

Analysis of deformation of rotor and influence on the performance of gyro based on B-spline wavelet FEM

Some construct characteristics and composing material of the new Gyro＇ s rotor are introduced. Some factors resulting in deformation of the rotor surface are analyzed. Under different loads such as the fo,＇ce of deflecting center, the change of temperature, the fo,ce of pressure and couple factors, the deformation of rotor is analyzed with the wavelet finite element simulation software. The vector distributing map of rotor reformation is given. The deformation resulting from the pressure force of photon is studied. Finally, the influence on Gyro＇ s performance because of anomalous surface of rotor due to deformation of rotor is researched and the result is useful to forecast the performance of the drift of gyroscope. The disturbing moment resulting from the deformation of rotor can be compensated using the mathematic method, and provides an important reference for both design and optimization of the rotor.     

发动机瞬时角速度波动分析

发动机在一定稳定工况下运转，瞬时转速会呈现一定的波动现象。本文介绍一种以发动机瞬时角速度的实时检测为基础，在一个工作循环内按着火顺序将做功冲程中瞬时角速度波动作为评价依据的判定发动机工作状况的方法。