该文介绍了美国Illinois Institute of Technology开发的测试成熟度模型(TMM),给出了修正过的软件开发V模型、TMM结构,描述了软件组织5个测试成熟度等级的行为特征、成熟度目标和成熟度子目标,并说明了TMM实施的方法,以及笔者对测试成...该文介绍了美国Illinois Institute of Technology开发的测试成熟度模型(TMM),给出了修正过的软件开发V模型、TMM结构,描述了软件组织5个测试成熟度等级的行为特征、成熟度目标和成熟度子目标,并说明了TMM实施的方法,以及笔者对测试成熟度模型的考虑。TMM针对软件测试过程的问题和特点,提出了改进软件测试过程及提高软件测试能力的思想和方法,这无疑是对SW-CMM的补充,所以值得积极尝试TMM。展开更多
介绍了美国Illinois Institute of Technology开发的测试能力成熟度模型（TMM），给出TMM的结构，描述了软件组织5个测试成熟度等级的行为特征、成熟度目标和成熟度子目标，并说明测试能力成熟度模型与软件能力成熟度模型（SW-CMM）的...介绍了美国Illinois Institute of Technology开发的测试能力成熟度模型（TMM），给出TMM的结构，描述了软件组织5个测试成熟度等级的行为特征、成熟度目标和成熟度子目标，并说明测试能力成熟度模型与软件能力成熟度模型（SW-CMM）的关系，以及笔者对测试能力成熟度模型的考虑。展开更多
The hybrid dynamics of multi-rigid-body and multi-flexible-body system becomes the mainstream of multi-body dynamics.Currently there lacks a compact approach to model the hybrid dynamics,especially in modern machine t...The hybrid dynamics of multi-rigid-body and multi-flexible-body system becomes the mainstream of multi-body dynamics.Currently there lacks a compact approach to model the hybrid dynamics,especially in modern machine tool application,due to the difficulty of solving the hybrid equations or the limitation of current software when dealing with the hybrid dynamics.The extended transfer matrix method（E-TMM）,which extends elements in three-dimensional space with higher matrixes,is proposed to simplify the modeling process of the hybrid dynamics.The E-TMM modeling approaches of 3 basic elements including 3D vibrant rigid body,joint and flexible body are studied in details.A parallel mill-turn tool spindle head unit driven by dual-linear motors is chosen as a plant to demonstrate the E-TMM modeling process.By using E-TMM,the spindle head unit is simplified as a topological network consisting of the three types of element,i.e.,3D vibrant rigid body,joint and flexible body,including 11 rigid bodies,14 joints and 1 3D-Timoshenko beam.Then the dynamic model of the system can be easily obtained by deducing the element-network by means of state vector transformation.The dynamic characteristics of the spindle head,such as natural frequencies,dynamic flexibility,etc.can be predicted by solving the obtained model.Experiment verification indicates that the E-TMM is valid with enough accuracy in the dynamic analysis of the parallel mill-turn tool spindle head.The E-TMM is capable of modeling the dynamics of machine tool structure with no requirements of deducing and solving the sophisticated differential equations.Moreover,the E-TMM provides a simple and elegant tool for hybrid dynamic analysis in future dynamic design of machine tools.展开更多
介绍了美国Illinois Institute of Technology开发的测试成熟度模型(TMM)。给出了修正过的软件开发V模型及TMM结构,描述了软件组织五个测试成熟度等级的行为特征、成熟度目标和成熟度子目标,并说明了TMM实施的方法,以及笔者对测试成熟...介绍了美国Illinois Institute of Technology开发的测试成熟度模型(TMM)。给出了修正过的软件开发V模型及TMM结构,描述了软件组织五个测试成熟度等级的行为特征、成熟度目标和成熟度子目标,并说明了TMM实施的方法,以及笔者对测试成熟度模型的考虑。展开更多
调制光栅Y分支激光器(modulated grating Y branch laser,MGY)是光纤光栅解调系统的理想光源,目前鲜有针对其调谐特性的建模研究,为研究MGY的调谐特性,本文将传输线激光器模型(transmission line laser model,TLLM)推广到模拟MGY,采用T...调制光栅Y分支激光器(modulated grating Y branch laser,MGY)是光纤光栅解调系统的理想光源,目前鲜有针对其调谐特性的建模研究,为研究MGY的调谐特性,本文将传输线激光器模型(transmission line laser model,TLLM)推广到模拟MGY,采用TLLM、传输矩阵法(transfer matrix method,TMM)与数字滤波方法相结合的组合模型对模拟MGY进行研究。在组合模型中,对增益区和相位区使用基于时域的TLLM;对左、右调制光栅(left/right modulated grating,LMG/RMG)区先使用基于频域的TMM进行表征,然后通过反向傅里叶变换为时域模型,成功模拟了MGY的输出-电流特性曲线、静态调谐特性等,与已发表的实验结果相近。此综合方法可用于研究使用频域模型难以获得的器件的瞬态响应和激光光谱特性。展开更多
文摘该文介绍了美国Illinois Institute of Technology开发的测试成熟度模型(TMM),给出了修正过的软件开发V模型、TMM结构,描述了软件组织5个测试成熟度等级的行为特征、成熟度目标和成熟度子目标,并说明了TMM实施的方法,以及笔者对测试成熟度模型的考虑。TMM针对软件测试过程的问题和特点,提出了改进软件测试过程及提高软件测试能力的思想和方法,这无疑是对SW-CMM的补充,所以值得积极尝试TMM。
文摘介绍了美国Illinois Institute of Technology开发的测试能力成熟度模型（TMM），给出TMM的结构，描述了软件组织5个测试成熟度等级的行为特征、成熟度目标和成熟度子目标，并说明测试能力成熟度模型与软件能力成熟度模型（SW-CMM）的关系，以及笔者对测试能力成熟度模型的考虑。
基金supported by National Key Technology R&D Program of China (Grant No. 2006BAF01B09)the Research Fund for Doctoral Program of Higher Education of China (Grant No. 200800060010)
文摘The hybrid dynamics of multi-rigid-body and multi-flexible-body system becomes the mainstream of multi-body dynamics.Currently there lacks a compact approach to model the hybrid dynamics,especially in modern machine tool application,due to the difficulty of solving the hybrid equations or the limitation of current software when dealing with the hybrid dynamics.The extended transfer matrix method（E-TMM）,which extends elements in three-dimensional space with higher matrixes,is proposed to simplify the modeling process of the hybrid dynamics.The E-TMM modeling approaches of 3 basic elements including 3D vibrant rigid body,joint and flexible body are studied in details.A parallel mill-turn tool spindle head unit driven by dual-linear motors is chosen as a plant to demonstrate the E-TMM modeling process.By using E-TMM,the spindle head unit is simplified as a topological network consisting of the three types of element,i.e.,3D vibrant rigid body,joint and flexible body,including 11 rigid bodies,14 joints and 1 3D-Timoshenko beam.Then the dynamic model of the system can be easily obtained by deducing the element-network by means of state vector transformation.The dynamic characteristics of the spindle head,such as natural frequencies,dynamic flexibility,etc.can be predicted by solving the obtained model.Experiment verification indicates that the E-TMM is valid with enough accuracy in the dynamic analysis of the parallel mill-turn tool spindle head.The E-TMM is capable of modeling the dynamics of machine tool structure with no requirements of deducing and solving the sophisticated differential equations.Moreover,the E-TMM provides a simple and elegant tool for hybrid dynamic analysis in future dynamic design of machine tools.
