Recreation vehicles : A perspective

The growth and popularity of recreation vehicles in the United States and other countries has implications for the travel and tourism industry. Owners of these vehicles require no separate lodging facilities while traveling and rarely patronize hotels or motels. They often perceive that they spend less for their vacations by staying at travel parks and campgrounds, but survey results and comparative cost analysis reveal that they spend more than automobile travelers when total fixed and variable costs are taken into account. Recreation vehicle (RV) preferences by income category suggest alternative modes of recreation travel and a vacation life style which has considerable appeal. This “RV life style” is characterized by a strong desire to experience the outdoors and socialize with other campers while still retaining the comforts and conveniences of a familiar domicile. Limiting characteristics include the provincial nature of recreation vehicle travel and the impact of mandatory fuel conservation measures.     

全自动洗衣机用直联单相盘式电动机的设计

介绍家用波轮型全自动洗衣机用直联单相电容运转盘式电动机的结构特点,主要性能指标以及在 研制过程中遇到的问题。     

Cost savings of using a marketable permit system for regulating light-duty vehicle emissions

In the USA, each individual vehicle is required to meet uniform per-mile emission standards. The uniform standard system does not allow vehicle manufacturers flexibility in achieving overall emission reduction goals for motor vehicles. The system provides manufacturers with little or no incentive to control vehicle emissions beyond what is required. In this paper, an incentive-based marketable permit system is proposed to replace the uniform standard system. Under the marketable permit system, vehicle manufacturers are required to meet corporate average emission standards; they are allowed to buy or sell vehicle emission reduction credits among themselves to meet corporate average standards; and they are allowed to bank vehicle emission reduction credits that are accumulated in earlier years and to use the credits for meeting average standards in later years. It is estimated in this study that relative to the current uniform standard system, the marketable permit system can reduce vehicle emission control costs by $150 to $400 million per year in California, or 13–30% of the costs currently spent on vehicle emission control.     

三相12/8极高压开关磁阻电机设计及仿真

根据开关磁阻电机的工作原理及结构,简要概述了电机参数设计方法、注意事项及步骤,给出了一台12/8极高压开关磁阻电机实验样机参数,利用Ansoft/Maxwell软件对电机参数进行了二维全场域的有限元分析和计算。得出了转矩脉动、绕组电流等波形以及电机磁力线分布、磁通密度云图分布。仿真结果和实验结果验证了参数设计方法的正确性,为今后开关磁阻电机的改进和优化提供了依据。     

小功率开关磁阻电机驱动系统设计

介绍了开关磁阻电机的原理以及本次实验所用到的三相12/8极48 V小功率开关磁阻电机,并以ARM单片机STM32F051为控制核心构成了调速系统,按功率变换器设计要求将MOS管并联使用,并根据选用的MOS管介绍它的驱动电路HIP4086,同时简要介绍了开关磁阻电机调速系统的各部分检测电路、保护电路,最后通过观察堵转和额定时SRM相电流和相电压波形以及对波形进行观察、分析,验证了控制器良好的调速性能。     

加盖自卸式垃圾车的推广前景

随着经济的不断发展,城镇化建设进程的加快,随之产生的建筑垃圾日益增多。为了解决建筑垃圾在转运过程中随地撒漏、尘土飞扬的现状,柳州延龙汽车有限公司进行了深入研究,率先在广西提出了建筑垃圾密闭化运输方式,并在南宁、柳州等城市成功使用加盖自卸式垃圾车,避免了建筑垃圾在转运过程中对环境造成二次污染。     

基于ARM和旋转滤波的异步电机故障检测方法的研究

提出了一种基于ARM和Park矢量旋转滤波的异步电机故障检测方法。该方法结合Park矢量旋转滤波和异步电机定转子故障特征,对定子电流信号进行分析,可有效地检测异步电机的故障。并通过实验证明,该检测方法正确可行。     

异步电机教学实验数据处理系统

本文介绍异步电机空载、短路、负载实验数据处理的数学方法和软件设计方法步骤,形成了实验教学软件。     

用AUTOLISP实现分马力电机可变尺寸图形的绘制

AUTO LISP 是嵌套在 AUTO CAD 绘图软件包中的一种功能很强的智能语言,可在绘图软件包环境下直接运行,是一种很适合绘制“可变尺寸图形”的方法。本文详细地研究了 AUTO LISP 源程序编制、在系统状态下编辑程序和在 HCAD 状态下绘图等内容。对 AUTO CAD 的开发应用具有重要作用。     

Usage‐based insurance and its acceptance: An empirical approach

This study aims to explore the motor insurance market's attitude towards usage‐based insurance (UBI), and thus its readiness for a launch in the near future. Data on client perception was collected using a structured questionnaire. On the basis of this, an initial selection of factors, other than income, that could influence the declared attitude of drivers was demonstrated showing that it is primarily dependent on certain demographic characteristics like their age, sex, or place of residence. A strong relationship was also demonstrated with respect to the intensity of the vehicle's use, to the amount of the insurance premium they have paid, and to the self‐assessment of the respondents' driving skills. Clients are likely to accept the concept of UBI once implemented, but that they are not ready yet to give up the traditionally used methods of premium calculation. Their attachment to discounts granted can be very strong in particular to the no‐claims bonus.