车载音频系统的自动增益补偿设计

针对传统车载音频系统不能自动适应不断变化的车内声音环境的问题,设计了基于DSP技术的自动增益补偿。首先测试分析当前多媒体播放音量和车内噪声等关键因素对车内收听效果的影响,然后自动调节车载音频系统的增益和滤波器参数值,尤其对音量和响度进行动态补偿,最终确保在不断变化的车内环境中高音质的听觉享受。实车测试表明,该设计能有效地减少车内噪声影响,满足车内听觉频响特性。     

Target point‐based path‐following controller for a car‐type vehicle using bounded controls

In this paper, we have studied the control problem of target point‐based path following for car‐type vehicles. This special path‐following task arises from the needs of vision‐based guidance systems, where a given target point located ahead of the vehicle, in the visual range of the camera, must follow a specified path. A solution to this problem is developed through a nonlinear transformation of the path‐following problem into a reference trajectory tracking problem, by modeling the target point as a virtual vehicle. The use of target point complicates the control problem, as the development produces a first‐order nonlinear nonglobally Lipschitz differential equation with finite escape time. This problem is solved by using small control signals. Bounded feedback laws are designed to control the real vehicle's angular acceleration and the virtual vehicle's velocity, to achieve stability. The resulting controller is globally asymptotically stable with respect to the origin, the proof of which is derived from Lyapunov‐based arguments and a bootstrap argument. It is also shown that the use of exponentially convergent observers/differentiators does not affect the stability of the closed‐loop system. The effectiveness of this controller has been illustrated through simulations. Copyright © 2014 John Wiley & Sons, Ltd.     

Exploring the Relationship Between Green Consumption Value,Satisfaction, and Loyalty to Hybrid Car in Elderly Consumers

The study aimed to examine the relationship between green consumption value, satisfaction, and loyalty of driving hybrid cars among elderly consumers. Data were collected from a cross‐sectional survey of 314 elderly consumers who purchased hybrid cars in the United States. A partial least squares analysis revealed that elderly consumers’ social, price, and quality values positively influenced the satisfaction of their hybrid car experience, and their satisfaction significantly influenced their loyalty of hybrid car. The relationship between green consumption value, satisfaction, and loyalty toward driving hybrid cars among elderly consumers revealed insight into their value orientations toward the hybrid car. Special efforts are suggested in promoting hybrid car use to elderly consumer groups. Marketers should pay attention to changing beliefs and increasing perceived values of driving a hybrid car for consumers to encourage them to use green products.     

矿车立体调度及定位电控系统设计

大型煤矿矿车数量、类型较多,存在矿车出入库空间如何充分利用的问题。文章提出了一种矿车立体调度及定位电控系统的设计方案,给出了基于丝杠传动方式的矿车出入库立体调度及定位规划设计;结合该系统架构,介绍了运动控制器SIMATIC CU320的电控配置、PLC单元与现场检测单元的配置及系统的网络组态。调试结果表明,该系统实现了稳定、准确的矿车调度及定位,提高了车位利用率。     

智能停车场管理系统的探讨

针对传统停车场存在着收费管理混乱及整体运作效率低等问题,设计了一种基于RFID的智能停车场管理系统。介绍了系统的基本功能、总体结构,并对RFID技术、车位引导技术和车牌自动识别技术进行了详细的探讨。     

菱形四轮驱动汽车动力传动系统的设计与研究

动力传动系统的设计对于一款新车的研发有着至关重要的作用。针对一种菱形四轮驱动汽车的动力传动系统进行了设计与研究。结合整车动力性评价指标,为提高行驶安全性,用工程分析与仿真校验相结合的方法对动力传动系统的主要部件进行了选型,确定了发动机、电机、主减速器、电池的主要性能参数。最后利用ADVISOR软件对相应工况下的整车动力性能（加速性能、爬坡性能和续驶里程）进行了仿真验证,结果表明所确定的动力系统的参数基本达到了整车动力性的要求,所设计的动力传动系统符合设计要求,为后期的实车研发工作起到了很好的指导作用。     

基于控件编程的上位机矿井操车监控系统

本文从矿井操车系统着手,针对矿井操车监控特点设计系统控件,在这些控件的基础上完成上位机软件监控,软件能实时监控系统运行状况,可远程监控,故障智能检测,维护量较小,有一定的推广价值。     

基于灰色模型的汽车保有量预测

根据某地区相关的统计数据,运用多元回归分析法,对该地区影响私人汽车发展的主要因素进行分析,对其保有量的发展趋势做出科学判断。然后,运用灰色系统理论,建立了该地区私人汽车保有量的预测模型GM(1,1)模型及其修正模型,找出其中的相关性和函数关系,从而对该地区私人汽车保有量进行定量的分析和预测。     

一种矿车防跑机构设计与仿真分析

为了减少斜井运输过程中因矿车发生跑车带来的安全隐患,设计了一种利用矿车自身的牵引力来实现自动防跑的新型矿车防跑机构,建立了机构的动力学模型,并采用机械系统动力学软件ADAMS的仿真功能,对防跑机构在制动过程中的运动特性进行了仿真。仿真结果表明在发生跑车后,制动爪可以在重力作用下落下,对矿车进行自动制动,联动器可以打开,实现多辆矿车之间的连锁制动。为矿车防跑机构的研究提供了参考。     

基于ARM的机场驱鸟车自动控制系统

针对目前机场驱鸟的迫切需要,本文设计了一种新型的驱鸟控制系统,将多种驱鸟方式整合在一起。通过视频监视模块将现场的鸟情实时地反映在监视屏上,工作人员根据不同的鸟情,选择不同的驱鸟方式,也可以多种驱鸟方式一起使用,以达到最好的驱鸟效果。