【作者】 艾思特；

【导师】 李永健；

【作者基本信息】 重庆大学 ， 车辆工程， 2002， 硕士

【摘要】 汽车的噪声和振动是影响汽车舒适性的主要因素，降噪减振是汽车设计和制造中重要的课题。利用计算机辅助测试系统检测噪声振动信号是分析查找噪声和振动源头的主要手段之一。Windows操作系统因其界面友好、使用简单得到了广泛的使用。以前的计算机辅助测试系统在Windows操作系统环境下已不能满足要求。在新环境下仍然有许多难点和疑点急待搞清和解决。 首先分析了普通应用程序在Windows 98操作系统中使用查询采样掉点以及Windows 2000不能访问硬件的原因和机理。深入的学习了使用DDK编写WDM的Windows驱动程序。通过驱动程序实现了查询采样和中断采样，对两种采样方式作了详细的阐述。 扭矩和转速的测量可以采用计时法和数字计数法。计时法通过直接使用系统自身的计数器8254和外部时钟对扭矩传感器产生的方波信号进行计时，得到扭矩和转速值。数字计数法根据计算扭矩并不需要具体的时间值而是两个时间比值的原理，采用数字脉冲计数求得扭矩值。并对两种方法的优缺点进行了比较，同时对数字计数法的精度和误差进行了分析。 使用PC机控制步进电机，在开环控制系统中比较常见。该文对在Windows下控制步进电机作了研究。在分析了步进电机频矩特性的基础上，编写了使用AD卡中的8255控制步进电机的软件。软件根据步进电机的特性和具体的负载计算出步进电机加、减速步进频率和最高运行频率，然后通过驱动程序发出控制步进电机的脉冲信号完成开环控制。更多还原

【Abstract】 The noise and vibration of automobile are the major factor that influences the comfort of automobile. Reducing noise and vibration is one of the important subjects in design and manufacture. The method that measuring systems aided by computer is used to check out the signals of noise and vibration is one of major methods to locate the source of noise and vibration. Windows operating system have gotten the extensive use because of his close friendly interface and use. The old measuring system aided by computers can’t be applied to the Windows operation system. There are many difficulties in new environment to be solved.Firstly, Reason and mechanism of losing data in sampling under Windows98 operating system was inquired as well as hardware can not be visited under Windows2000 in the ordinary application. The study of compiling the Windows’s WDM drive through DDK has been gone deep into. Query sampling and interrupt sampling have been realized by way of the drive procedure. And the two kinds of sampling methods are expounded detailed.The measurement torsion and rotating speed can adopt time reckoning and the numeral count law. The counter 8254 of the system and the outside clock are used directly in the time reckoning method to reckon the time of square wave given rise by the torque sensor. The torsion and the rotating speed value can be gotten. The numeral count law get the value of torsion through numeric pulses according to the principle that the torsion value obtained does not need concrete tune span but the ratio of two time spans. Then the merit and shortcoming of two kinds of methods have been compared, and the precision and error of the numeral count law have been analyzed.It is fairly common in the open-loop control system that PC is used to control stepping motor. The research for controlling stepping motor under Windows has been done. The software for controlling stepping motor has been compiled in the chip 8255 on AD board after analyzing the relationship of stepping motor between torsion and frequency. The software figure out the frequency in the processes of acceleration, deceleration and at the highest speed according the property of stepping motor and the concrete load, then the pulse signals are sent to control the stepping motor and complete the open loop control.更多还原