混合动力RTG节能技术

以柴油发电机组驱动的常规RTG能耗高、废气及噪声污染严重,采用混合动力RTG,可以较好地解决这些问题.     

基于CATIA的商用车等效转向阻力矩计算方法

基于CATIA软件建立车辆三维骨架模型,通过DMU运动学仿真的传感器监测功能,测量出相应零部件的角速度和线速度,再基于等效力距的概念(即:瞬时功率与实际作用在机械上的所有外力和力矩的瞬时功率之和相等),通过EXCEL软件的函数功能,计算出车辆任意转角下转向机输出端的等效阻力距,为车辆对转向机及转向助力油缸的选型提供高效准确的参考。     

电动汽车FOTA技术原理与测试方法研究

随着人们对汽车的各项要求逐渐提高,车辆朝着智能化、网联化趋势发展。车联网、无线通信、远距离无线通信、专用短程通信、5G通信等技术的日趋成熟,为汽车FOTA技术应用提供充足条件。本文系统阐述了电动汽车FOTA系统的组成方案、升级流程和升级方式,详细介绍了电动汽车FOTA的测试目的和测试方法。     

智能座舱HMI人机交互界面体验及未来趋势浅析

随着新四化的开展,汽车已经开始从简单的交通工具逐渐向智能终端转变.智能座舱作为用户和车辆进行交流的界面,逐步成为企业产品智能化的新破局点.而HMI人机交互设计作为座舱智能化发展的基础,在汽车研发过程中占有愈发重要的地位,如何更好的量化人机交互特征性研究也成为了企业的关注重点.本文首先分析智能座舱及HMI人机交互设计在汽...     

Strong tracking adaptive Kalman filters for underwater vehicle dead reckoning

To improve underwater vehicle dead reckoning, a developed strong tracking adaptive kalman filter is proposed. The filter is improved with an additional adaptive factor and an estimator of measurement noise covariance. Since the magnitude of fading factor is changed adaptively, the tracking ability of the filter is still enhanced in low velocity condition of underwater vehicles. The results of simulation tests prove the presented filter effective.     

电动汽车用锂离子电池单体温度场分析

文章通过实验测得了锂离子电池内阻在常温下随soc的变化情况.实验显示放电时soc在0.2到1之间时内阻变化不大,soc小于0.2时内阻急剧升高,且充电内阻明显大于放电内阻.之后进行了锂离子电池单体在常温下,0.8C和1C的充放电温升试验.获得了温升随时间变化的数据.并通过fluent对电池单体进行了与实验对应的仿真,仿...     

模糊综合评判在黄土路基承载力评价中的应用

通过分析影响黄土湿陷性及公路路基承载力的主要因素,给出影响黄土地区公路路基承载力分级的隶属函数,建立了黄土地区公路路基承载力等级模糊综合评判模型,用以对黄土地区公路路基承载力等级进行评价,并同实测值进行比较,验证了其可行性及计算精度。     

水面无人艇在风干扰下的操纵性能仿真

根据静水中完整的操纵运动数学模型,对无人艇载体平台滑行艇,在定常风假设下,建立了风干扰下简化的滑行艇操纵运动数学模型.利用数学模型对滑行艇在风压力及风压作用下在各个角度下的操纵运动进行仿真.     

Influences on the spatial directivity of acoustic vector sensor by finite cylinder baffle and future prospects about eliminating the effects

The directivity of acoustic vector sensor can be distorted by the sound diffraction wave of baffle. According to Helmholtz integral equation, the directivity of acoustic vector sensor under the condition of finite cylinder baffle is calculated by using boundary element method (BEM). Considering the problem of nearly singular integrals of BEM, the exponent parts of fundamental solutions are expanded in trigonometric functions. The singular and the nonsingular parts are separated: the nonsingular parts are calculated by Gaussian integral method; the singular parts are regularized by subsection integral method. Then the surface integrals are reduced into line integrals along the elements?? contour which can be calculated by Gaussian integral method. The sound diffraction field of a plane wave under the condition of finite cylinder baffle at different frequencies and incident angles is calculated, and the characteristics of directivity of pressure and vibration velocity at different frequencies are analyzed. The experimental data are treated and the errors between the experimental and theoretical results are analyzed. Finally, according to the research results about the influences on the directivity of acoustic vector sensor by baffle at present, some future prospects about eliminating the effects of sound diffraction field by baffle are presented.     

喷水推进器进水流道内流场数值模拟与分析

进水流道是喷水推进系统的关键部件之一,该部件性能优良与否直接影响到整个喷水推进系统工作性能的优劣．考虑到船底边界层对进水流道来流动量和动能的影响及喷水推进器各部件的相互作用,合理界定了喷水推进器数值计算所需的流场控制体,联用六面体结构化网格和四面体非结构化网格进行区域离散,选择κ-ε两方程湍流模型封闭RANS方程,采用稳态多参考系方法计算求解．分析和比较了船的航速和喷泵的转速对进水流道内流场的速度和压力分布的影响,评估了进水流道的出流均匀度、唇部最小压力点位置的偏移、空化可能性等多方面的性能．研究发现：航速的增加使流道出流变的不均匀,使唇部最小压力点的位置向下偏移;进水流道的出口、唇部和斜坡处是易发生空化的地方,应保证所在运行工况的三处静压力最小值均大于空化临界静压力值．