一款RISC型流水线MCU的设计与实现

介绍一款采用自定义指令集的RISC型MCU的设计与实现.整个设计采用数据和指令分开的哈佛结构,并采用了四级流水线以提高MCU的运行速度和效率.同时分析了该设计中的流水线所遇到的冒险问题,采取了一定的解决方案.该设计采用自顶向下的设计流程,使用硬件描述语言Verilog进行描述,通过EDA工具对设计进行相应的仿真,并最终在Xilinx的FPGA芯片上进行实现.     

自动折叠式太阳能板的设计

针对目前太阳能板不能自动折叠和清洁,容易受恶劣天气影响等问题,设计了一种自动折叠式太阳能板.这一太阳能板采用键盘台推拉原理进行折叠,展开前体积很小,展开后受光面积大,同时采用工业云台实时追踪太阳光,有效提高了太阳能的利用效率.所设计的自动折叠式太阳能板结构紧凑,应用灵活.设计中采用数字化双胞胎技术,可以缩短设计周期,降低设计成本.     

高速高精数控车床液压系统的设计

为解决薄壁、复杂和精密零件的加工难题,设计了一种斜床身的高速高精数控车床.机床采用液压系统实现工件夹紧、刀塔旋转定位和尾架顶紧.液压系统采用变量叶片泵,降低了功耗和发热并采用模块化设计,组合灵活,布局合理.实际应用证明,该系统工作稳定可靠,满足了机床高速高精的设计要求.     

复杂产品设计中基于业务构件的集成方法研究

为了实现对设计过程和数据的统一管理,以及应对不断变化的需求,采用业务构件技术,实现设计数据、可变业务流程、设计资源及用户界面的集成管理.通过业务构件技术,实现系统模块的重构;设计了专用数字化设计构件,实现设计资源的无缝集成;针对软件资源的不同版本,封装不同的图形用户接口;采用智能Agent技术.通过消息逻辑实现对象调用.以构件为元素,采用设计流程模板技术支持业务流程的重组.最后,以飞机飞行载荷计算为例,对提出方法的有效性进行了验证.     

基于LabVIEW的气体流量分析仪的数据采集系统

为实现瞬态工况法测量汽车尾气排放量,采用虚拟仪器技术,设计了气体流量分析仪的数据采集系统.系统采用PCI2003数据采集卡,采用LabVIEW设计的信号处理程序和人机界面.标定实验表明,标准流量测量的基本误差优于1%.     

新型智能低功耗热量表的设计与实现

提出了一种新型热量表的软、硬件设计方法.采用目前国际上功耗最低的MSP430FW425单片机为主控制器.Pt1000为温度传感器,其流量测量部分采用无磁流量计和韦根流量传感器,提高了测量的精度和灵敏度,设计中还预留了数据输出接口.从硬件和软件两个方面考虑了低功耗设计.     

基于Pro／E的自顶向下的皮带机三维参数化设计

介绍在Pro/E的环境下,采用自顶向下的设计方法设计皮带机的设计流程,参数化设计的关键步骤.设计结果表明,采用自顶向下设计方法能够提高设计效率,实现团队问的并行工作.     

基于DSP的双闭环SPWM逆变器研究

采用TI公司的16位数字信号处理器TMS320LF2406设计了1台1 kVA的逆变器样机.该逆变器设计中采用了基于输出电压瞬时值和有效值反馈的双闭环控制结构,设计了完整的系统硬件和软件,并进行了相应的实验验证.实验结果表明,该系统具有良好的动静态性能.     

整体叶盘制造毛坯设计原则与设计方法研究

整体叶盘是高性能航空发动机上采用的新技术,广泛应用于国内外新型航空发动机和弹用动力装置中.该技术的应用促进了航空发动机零件的结构创新,新结构零件的研制需要采用新的设计方法实现其制造毛坯的设计.本文提出的整体叶盘毛坯设计原则和设计方法是整体叶盘技术应用中系列化制造技术的重要组成部分.     

120公里交流传动货运电力机车流线型司机室三维设计方法

采用三维设计可以明显提高设计能力,减少设计中可能出现的差错.120公里/小时交流传动货运电力机车(以下简称120公里)采用Pro/E三维软件进行设计,使用IntralLINK对数据进行管理和使用,实现了整车设计的参数化和各部门的并行工作.自顶向下的设计方法被用于流线型司机室钢结构的设计中,达到了设计要求,实现了预期的目的.     

基于模块化的产品自适应设计系统研究

提出了现代设计方法学支持下的产品自适应设计技术，给出了基于模块化的产品自适应设计系统框架模型、基于模块化的产品族体系结构、基于模块化的产品自适应设计过程映射模型和自适应设计控制器，构建了基于BP神经网络的模块适应度算法。并以注塑模具为对象，开发了基于模块化的产品自适应设计原型系统。     

Remote calibration system for frequency based on in-place benchmark

According to the deficiencies of remote calibration mode based on material object reference, a new model of a remote calibration system for frequency based on in-place benchmark is introduced, which is made of a calibration subsystem on the spot and a remote management subsystem. The key technology of some key problems for the remote calibration system is particularly discussed, including the time and frequency benchmark receiving module based on global positioning system (GPS), frequency comparison based on a phase method, frequency division based on dual high-frequency phase locked loop (PLL), and remote calibration based on the web. The results show that the system possesses some characteristics, such as high precision, good versatility, and no limitation of time and place.     

Remote calibration system for frequency based on in-place benchmark

According to the deficiencies of remote calibration mode based on material object reference, a new model of a remote calibration system for frequency based on in-place benchmark is introduced, which is made of a calibration subsystem on the spot and a remote management subsystem. The key technology of some key problems for the remote calibration system is particularly discussed, including the time and frequency benchmark receiving module based on global positioning system (GPS), frequency comparison based on a phase method, frequency division based on dual high-frequency phase locked loop (PLL), and remote calibration based on the web. The results show that the system possesses some characteristics, such as high precision, good versatility, and no limitation of time and place.     

Stereological ratio estimation based on counts from integral test systems

The stereological practice of using integral test systems in the estimation of the fundamental stereological ratios is studied in the light of recent theoretical developments in sampling. The estimation of a ratio is based on counts only, obtained from two, in general different, test sets constituting the integral test system. The ordinary ratio-of-sums estimator based on counts from uniformly positioned integral test systems is compared with two estimators based on non-uniform, weighted sampling. It is shown that the estimators based on weighted sampling are not, in general, unbiased. Furthermore, it is pointed out that the mean-of-ratios estimator based on replicated weighted sampling needs not have smaller MSE than the ordinary ratio-of-sums estimator based on replicated uniform sampling. The fact that the estimation is based on counts as opposed to complete 2-d observations does not necessarily mean a reduction in information. For certain types of stereological ratios, the ordinary ratio-of-sums estimator based on complete observation is shown, counter to intuition, to be less accurate than that based on simple and fast counting.     

Cutting tools reliability and residual life prediction from degradation indicators in turning process

In the field of cutting tool reliability, an investigation based on four complementary approaches for tool wear assessment is proposed: the approach 1 is a general failure times approach (statistical reliability based on flank wear threshold hitting times), the approach 2 is based on power consumption monitoring (statistical reliability based on power threshold hitting times), the approach 3 is based on vibration signal analysis (statistical reliability based on vibration threshold hitting times), and the approach 4 is based on the evolution of flank wear for each insert (statistical reliability based on predicted failure times). For this study, 30 identical inserts from a same batch were studied with a CNC lathe in identical turning conditions. As the remaining useful life assessment is the final goal, this study highlight four approaches in order to find out the safest one. The results obtained showed that the approach 1 has too many uncertainties, whereas the approach 2 provides more specific and safer replacement times. The approach 3, in the first hand, highlights the fact that cutting conditions are not exactly identical and, in the second hand, leads to a safe conditional replacement of an insert. Finally, it appeared that the approach 4 allows applying a predictive maintenance strategy.     

面向实例推理的产品设计本体建模研究及应用

分析现有基于实例推理的产品设计系统,针对其缺乏对实例功能、行为等描述的缺点提出面向实例推理的产品设计本体模型,并利用本体技术建立基于实例推理的产品设计实例本体及产品设计实例本体模型.依照产品设计特点研究产品设计实例本体模型的重要性质,依据实例推理的产品设计给出基于本体的产品设计实例本体检索机制.在检索中利用本体模型的EDCOM数组,通过相似度算法进行匹配找出合适的产品设计实例,在本体模型库维护中给出本体模型的集成算法.最后以汽车零部件企业为实例,并利用本体技术开发了基于实例推理的产品设计原型系统,通过设计系统的产品设计要求、检索实例等功能模块实现了基于实例推理的产品设计.     

LED在基于光纤传输的照明系统中的应用

为了实现将LED应用于基于光纤传输的照明系统中以替代传统光源,首先简要介绍了基于光纤传输照明系统的应用及组成,描述了LED应用于光纤传输照明系统设计的光学扩展量理论。根据光学扩展量理论分析了LED选型方法,总结了基于LED光纤传输照明系统的设计原则和要点。然后应用设计实例:基于红,绿和蓝三色LED合光的光纤照明模组,详述了设计过程,给出了测试数据。结果表明:LED可以应用于光纤传输照明系统中替代传统光源,市场前景广阔。     

基于深度学习的铸件缺陷检测方法

针对铸件X射线图像获取困难、人工及传统识片方法效率低且漏判率高的问题,文中提出了一种基于深度学习的铸件缺陷检测方法。首先,采用Overlap切图（重叠切图）数据增广方法实现缺陷扩充,并基于简化Mosaic数据增广进一步提升图像的复杂度;然后,基于仅浏览一次（You Only Look Once, YOLO）的理念实现缺陷检测模型构建;最后,提出一种基于边界框抑制的测试图像缺陷检测方法,以子图迭代方式完成测试图像中的缺陷检测。实验结果表明,该方法能够有效实现多种铸件缺陷的自动检测,为铸件缺陷检测提供了基于深度学习的解决方案。     

基于广义特征的零件信息模型研究

针对并行工程的需求,基于广义特征和ＳＴＥＰ标准建立了零件信息模型,并在Ｐｒｏ／Ｅｎｇｉｎｅｅｒ软件二次开发的基础上,实现了一个基于特征的ＣＡＤ系统,该系统可实现自动特征识别。基于所建立的零件信息模型,系统可自动生成ＳＴＥＰ文件,为设计的后续过程提供丰富的零件信息,便于实现ＣＡＤ与后续过程的集成和并行。利用建立的零件信息模型,实现了ＣＡＤ／ＣＡＰＰ／ＤＦＭ的信息集成。     

基于多尺度Fourier-Mellin变换的末制导目标跟踪

针对光电成像末制导阶段目标尺寸迅速增大且可能伴有旋转的稳定跟踪问题,采用了一种基于多尺度Fourier-Mellin变换的目标跟踪方法.根据高斯尺度空间理论和Fourier-Mellin变换,构造了基于多尺度Fourier-Mellin的图像变换参数估计策略.利用平均绝对差分匹配准则对模板和待匹配图像进行图像匹配,当匹配误差过大时,基于多尺度Fourier-Mellin变换进行模板参数估计,求出模板与当前目标之间的尺度和旋转变换参数,并利用双线性内插调整模板,求得目标匹配位置,对模板进行刷新.仿真结果表明,该算法能够适应末制导阶段目标尺寸的急剧变化,实现对目标的稳定跟踪,其跟踪精度和稳定性优于传统方法.