盘/轴系统瀑布图的仿真

介绍了以MATLABV5 2为平台开发的盘 /轴系统瀑布图的仿真程序 ,仿真的结果可为设计和调整系统参数提供直观 ,可靠的依据。     

用位置锁相环实现机床主轴准停控制

介绍了一种用于数控车床的精确主轴定位准停的实用方法,数控系统发出M19命令给单片机8031系统。单片机系统通过接收主轴位置编码器的反馈信号,并计算后发出1个模拟量控制主轴驱动系统,主轴减速并稳定到设定值,当主轴运行到预设的角度后即到准停位置停止。     

SUPPRESSION OF PERIOD DOUBLING CHATTER IN HIGH-SPEED MILLING BY SPINDLE SPEED VARIATION

Spindle speed variation is a well known technique to suppress regenerative machine tool vibrations, but it is usually considered to be effective only for low spindle speeds. In the current paper, spindle speed variation is applied to the high speed milling process, at the spindle speeds where the constant speed cutting results in period doubling chatter. The stability analysis of triangular and sinusoidal shape variations is made numerically with the semi-discretization method. It is shown that the milling process can be stabilized by increasing the amplitude of the spindle speed variation, while the frequency of the variation has no significant effect on the dynamic behaviour. The results are validated by experiments. Based on the analysis of the machined workpieces, it is shown that the surface roughness can also be decreased by the spindle speed variation technique.     

Double-crested Cormorant (Phalacrocorax auritus) chick bioenergetics following round goby (Neogobius melanostomus) invasion and implementation of cormorant population control

As the fish community changed in the Beaver Archipelago (northern Lake Michigan), so has the diet of breeding Double-crested Cormorants (Phalacrocorax auritus). In 2000, the energetically dense alewife (Alosa pseudoharengus) dominated the diet, but more recently, the relatively low quality round goby (Neogobius melanostomus) has become the most common prey item. Additionally, cormorant control measures have been underway in the archipelago. This study investigated decreases in cormorant chick numbers and changes in chick bioenergetics in response to this change in diet, as well as the influence of control efforts, and compared these results to an earlier study. Two colonies, one actively controlled the other only controlled following completion of this study, were investigated to determine changes in colony size throughout the breeding season, document chick diet, measure chick growth, and determine chick survivorship to fledging. The bioenergetics model estimated that in 2010, chicks consumed a greater biomass of prey to reach fledging due to the change in diet, but lower biomass overall due to fewer chicks in the system. Control efforts in combination with the change in diet reduced chick numbers. Overall, the impact of cormorant chicks on available fish biomass has declined in recent years due to control efforts. However, the birds have the potential to consume a greater biomass of round goby in the absence of control. The impact of cormorants on fisheries resources is complicated by the abundance and effects of non-native species.     

基于ANSYS的国产数控机床高速电主轴的仿真分析

为了研究国产数控机床高速电主轴的静、动态性能,通过ANSYS分析软件建立了电主轴的简化有限元模型,对电主轴的静、动态特性参数进行了数值仿真分析;并采用实验模态测试技术验证了有限元模型的有效性和准确性;在此基础上,分析了电主轴支撑跨距对电主轴动态性能的影响规律,确定了电主轴跨距的最优范围.结果表明,有限元仿真与实验模态测试结合,能有效分析电主轴的动态性能,并实现结构的优化.     

基于ANSYS Workbench的绕线机主轴系统动力学特性研究

绕线机主轴系统动力学特性对其整机性能有极其重要的影响,进而影响绕线机的精度与工作噪声。利用SolidWorks对主轴系统进行建模,采用动力学分析软件ADAMS对安装于主轴系统上部的排线机构进行分析与仿真,得到接触力时间历程曲线,并基于有限元协同仿真环境ANSYSWorkbench对主轴系统进行模态与瞬态分析。分析结果表明,主轴系统基频为451．93Hz、最大变形0．13μm。     

基于知识的高速主轴系统智能设计

为提高制造企业设计效率和设计水平,以高速主轴系统设计开发为研究对象,提出了一种基于知识的高速主轴系统设计框架.采用本体论的知识建模方法,实现知识的重用,并重点阐述了规则知识描述、实例知识描述、知识处理模板等关键技术在高速主轴系统平台设计中的应用.该系统集成了主轴设计的经验、知识和过程,实现了知识共享,能帮助设计人员快速有效地完成高速主轴系统的智能设计.     

基于知识的高速主轴系统智能设计

为提高制造企业设计效率和设计水平,以高速主轴系统设计开发为研究对象,提出了一种基于知识的高速主轴系统设计框架。采用本体论的知识建模方法,实现知识的重用,并重点阐述了规则知识描述、实例知识描述、知识处理模板等关键技术在高速主轴系统平台设计中的应用。该系统集成了主轴设计的经验、知识和过程,实现了知识共享,能帮助设计人员快速有效地完成高速主轴系统的智能设计。     

数控机床高速电主轴状态信号处理

研究了利用小波理论进行电主轴状态信号的监测处理方法。阐述基于嵌入式电主轴实时测试系统的硬件体系,小波基本理论以及Mallat算法;最后以电主轴加速度信号为例,利用小波理论分析了信号与噪声呈现的不同特性,进行小波逆变换重构信号,解决了加速度信号去噪和恢复。这样可以准确提取电主轴的运行状态信息,为数控系统的决策和控制提供很好的依据,具有重要的研究意义。     

基于位置-刻度模型的主轴系统可靠性分析

为评估主轴系统的顾客满意度指标——平均首次故障时间,对24台主轴系统进行定时截尾现场试验,针对主轴系统故障数据为小样本且某些主轴系统无故障数据的特点,引入位置-刻度模型进行威布尔分布的参数估计,通过d检验和游程检验验证威布尔分布假设的合理性,并根据最终获得的威布尔模型确定主轴的平均首次故障时间。